Initial content commit

.github/FUNDING.yml

@@ -0,0 +1,15 @@
+# These are supported funding model platforms
+
+github: [ByteWelder]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+polar: # Replace with a single Polar username
+buy_me_a_coffee: bytewelder
+thanks_dev: # Replace with a single thanks.dev username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,34 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: 'Bug: '
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Details (please complete the following information):**
+ - ESP type: [e.g. ESP32-S3]
+ - Device: [e.g. LilyGo T-Deck]
+ - Tactility version: [e.g. 0.2.0]
+ - TactilitySDK version: [e.g. 0.2.0]
+
+**Additional context**
+Add any other context about the problem here.
+Add your oops.tactility.one URL if you had a crash (scanned from QR).

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,10 @@
+---
+name: Question
+about: Ask a question
+title: ''
+labels: question
+assignees: ''
+
+---
+
+

.github/actions/build-app/action.yml

@@ -0,0 +1,26 @@
+name: Build
+
+inputs:
+  app_name:
+    description: The name of the app directory
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+    - name: 'Build'
+      uses: espressif/esp-idf-ci-action@v1
+      with:
+        esp_idf_version: v5.5
+        path: './Apps/${{ app_name }}'
+        command: 'tactility.py build'
+    - name: 'Upload Artifact'
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ app_name }}
+        path: 'Apps/${{ app_name}}/build/${{ app_name }}.app'
+        retention-days: 30
+

.github/workflows/build-app.yml

@@ -0,0 +1,36 @@
+name: Build Firmware
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions: read-all
+
+jobs:
+  Calculator:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Build"
+        uses: ./.github/actions/build-app
+        with:
+          app_name: Calculator
+  HelloWorld:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Build"
+        uses: ./.github/actions/build-app
+        with:
+          app_name: HelloWorld
+  GraphicsDemo:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Build"
+        uses: ./.github/actions/build-app
+        with:
+          app_name: GraphicsDemo
+

.gitignore

@@ -0,0 +1,17 @@
+.idea/
+.DS_Store
+
+build/
+cmake-build-*/
+CMakeCache.txt
+CMakeFiles
+
+sdkconfig
+sdkconfig.old
+
+.vscode/
+.gitpod.yml
+
+.tactility/
+
+dependencies.lock

Apps/.clang-format

@@ -0,0 +1,70 @@
+# Generated from CLion C/C++ Code Style settings
+# See https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+BasedOnStyle: LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: BlockIndent
+AlignConsecutiveAssignments: None
+AlignOperands: DontAlign
+AlignTrailingComments: false
+AllowAllArgumentsOnNextLine: false
+AllowAllConstructorInitializersOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Always
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Always
+AllowShortLambdasOnASingleLine: All
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterReturnType: None
+AlwaysBreakTemplateDeclarations: Yes
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterCaseLabel: false
+  AfterClass: false
+  AfterControlStatement: Never
+  AfterEnum: false
+  AfterFunction: false
+  AfterNamespace: false
+  AfterUnion: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: true
+BreakBeforeBinaryOperators: None
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
+ColumnLimit: 0
+CompactNamespaces: false
+ContinuationIndentWidth: 4
+EmptyLineBeforeAccessModifier: Always
+EmptyLineAfterAccessModifier: Always
+IndentCaseLabels: true
+IndentPPDirectives: None
+IndentWidth: 4
+KeepEmptyLinesAtTheStartOfBlocks: true
+MaxEmptyLinesToKeep: 2
+NamespaceIndentation: None
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PointerAlignment: Left
+ReflowComments: false
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: true
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never

Apps/Calculator/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+if (DEFINED ENV{TACTILITY_SDK_PATH})
+    set(TACTILITY_SDK_PATH $ENV{TACTILITY_SDK_PATH})
+else()
+    set(TACTILITY_SDK_PATH "../../release/TactilitySDK")
+    message(WARNING "⚠️ TACTILITY_SDK_PATH environment variable is not set, defaulting to ${TACTILITY_SDK_PATH}")
+endif()
+
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+set(EXTRA_COMPONENT_DIRS ${TACTILITY_SDK_PATH})
+
+project(Calculator)
+tactility_project(Calculator)

Apps/Calculator/main/CMakeLists.txt

@@ -0,0 +1,6 @@
+file(GLOB_RECURSE SOURCE_FILES Source/*.c*)
+
+idf_component_register(
+    SRCS ${SOURCE_FILES}
+    REQUIRES TactilitySDK
+)

Apps/Calculator/main/Source/Calculator.cpp

@@ -0,0 +1,204 @@
+#include "Calculator.h"
+#include "Stack.h"
+
+#include <cstdio>
+#include <ctype.h>
+#include <tt_lvgl_toolbar.h>
+
+constexpr const char* TAG = "Calculator";
+
+static int precedence(char op) {
+    if (op == '+' || op == '-') return 1;
+    if (op == '*' || op == '/') return 2;
+    return 0;
+}
+
+void Calculator::button_event_cb(lv_event_t* e) {
+    Calculator* self = static_cast<Calculator*>(lv_event_get_user_data(e));
+    lv_obj_t* buttonmatrix = lv_event_get_current_target_obj(e);
+    lv_event_code_t event_code = lv_event_get_code(e);
+    uint32_t button_id = lv_buttonmatrix_get_selected_button(buttonmatrix);
+    const char* button_text = lv_buttonmatrix_get_button_text(buttonmatrix, button_id);
+    if (event_code == LV_EVENT_VALUE_CHANGED) {
+        self->handleInput(button_text);
+    }
+}
+
+void Calculator::handleInput(const char* txt) {
+    if (strcmp(txt, "C") == 0) {
+        resetCalculator();
+        return;
+    }
+
+    if (strcmp(txt, "=") == 0) {
+        evaluateExpression();
+        return;
+    }
+
+    if (strlen(formulaBuffer) + strlen(txt) < sizeof(formulaBuffer) - 1) {
+        if (newInput) {
+            memset(formulaBuffer, 0, sizeof(formulaBuffer));
+            newInput = false;
+        }
+        strcat(formulaBuffer, txt);
+        lv_label_set_text(displayLabel, formulaBuffer);
+    }
+}
+
+Dequeue<Str> Calculator::infixToRPN(const Str& infix) {
+    Stack<char> opStack;
+    Dequeue<Str> output;
+    Str token;
+    size_t i = 0;
+
+    while (i < infix.length()) {
+        char ch = infix[i];
+
+        if (isdigit(ch)) {
+            token.clear();
+            while (i < infix.length() && (isdigit(infix[i]) || infix[i] == '.')) { token.append(infix[i++]); }
+            output.pushBack(token);
+            continue;
+        }
+
+        if (ch == '(') { opStack.push(ch); } else if (ch == ')') {
+            while (!opStack.empty() && opStack.top() != '(') {
+                output.pushBack(Str(1, opStack.top()));
+                opStack.pop();
+            }
+            opStack.pop();
+        } else if (strchr("+-*/", ch)) {
+            while (!opStack.empty() && precedence(opStack.top()) >= precedence(ch)) {
+                output.pushBack(Str(1, opStack.top()));
+                opStack.pop();
+            }
+            opStack.push(ch);
+        }
+
+        i++;
+    }
+
+    while (!opStack.empty()) {
+        output.pushBack(Str(1, opStack.top()));
+        opStack.pop();
+    }
+
+    return output;
+}
+
+double Calculator::evaluateRPN(Dequeue<Str> rpnQueue) {
+    Stack<double> values;
+
+    while (!rpnQueue.empty()) {
+        Str token = rpnQueue.front();
+        rpnQueue.popFront();
+
+        if (isdigit(token[0])) {
+            double d;
+            sscanf(token.c_str(), "%lf", &d);
+            values.push(d);
+        } else if (strchr("+-*/", token[0])) {
+            if (values.size() < 2) return 0;
+
+            double b = values.top();
+            values.pop();
+            double a = values.top();
+            values.pop();
+
+            if (token[0] == '+') values.push(a + b);
+            else if (token[0] == '-') values.push(a - b);
+            else if (token[0] == '*') values.push(a * b);
+            else if (token[0] == '/' && b != 0) values.push(a / b);
+        }
+    }
+
+    return values.empty() ? 0 : values.top();
+}
+void Calculator::evaluateExpression() {
+    double result = computeFormula();
+
+    size_t formulaLen = strlen(formulaBuffer);
+    size_t maxAvailable = sizeof(formulaBuffer) - formulaLen - 1;
+
+    if (maxAvailable > 10) {
+        char resultBuffer[32];
+        snprintf(resultBuffer, sizeof(resultBuffer), " = %.8g", result);
+        strncat(formulaBuffer, resultBuffer, maxAvailable);
+    } else { snprintf(formulaBuffer, sizeof(formulaBuffer), "%.8g", result); }
+
+    lv_label_set_text(displayLabel, "0");
+    lv_label_set_text(resultLabel, formulaBuffer);
+    newInput = true;
+}
+
+double Calculator::computeFormula() {
+    return evaluateRPN(infixToRPN(Str(formulaBuffer)));
+}
+
+void Calculator::resetCalculator() {
+    memset(formulaBuffer, 0, sizeof(formulaBuffer));
+    lv_label_set_text(displayLabel, "0");
+    lv_label_set_text(resultLabel, "");
+    newInput = true;
+}
+
+void Calculator::onShow(AppHandle appHandle, lv_obj_t* parent) {
+    lv_obj_remove_flag(parent, LV_OBJ_FLAG_SCROLLABLE);
+    lv_obj_set_flex_flow(parent, LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_style_pad_row(parent, 0, LV_STATE_DEFAULT);
+
+    lv_obj_t* toolbar = tt_lvgl_toolbar_create_for_app(parent, appHandle);
+    lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
+
+    lv_obj_t* wrapper = lv_obj_create(parent);
+    lv_obj_set_flex_flow(wrapper, LV_FLEX_FLOW_ROW);
+    lv_obj_set_flex_align(wrapper, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START);
+    lv_obj_set_width(wrapper, LV_PCT(100));
+    lv_obj_set_height(wrapper, LV_SIZE_CONTENT);
+    lv_obj_set_flex_grow(wrapper, 0);
+    lv_obj_set_style_pad_top(wrapper, 4, LV_PART_MAIN);
+    lv_obj_set_style_pad_bottom(wrapper, 4, LV_PART_MAIN);
+    lv_obj_set_style_pad_left(wrapper, 10, LV_PART_MAIN);
+    lv_obj_set_style_pad_right(wrapper, 10, LV_PART_MAIN);
+    lv_obj_set_style_pad_column(wrapper, 40, LV_PART_MAIN);
+    lv_obj_set_style_border_width(wrapper, 0, 0);
+    lv_obj_remove_flag(wrapper, LV_OBJ_FLAG_SCROLLABLE);
+
+    displayLabel = lv_label_create(wrapper);
+    lv_label_set_text(displayLabel, "0");
+    lv_obj_set_width(displayLabel, LV_SIZE_CONTENT);
+    lv_obj_set_align(displayLabel, LV_ALIGN_LEFT_MID);
+
+    resultLabel = lv_label_create(wrapper);
+    lv_label_set_text(resultLabel, "");
+    lv_obj_set_width(resultLabel, LV_SIZE_CONTENT);
+    lv_obj_set_align(resultLabel, LV_ALIGN_RIGHT_MID);
+
+    static const char* btn_map[] = {
+        "(", ")", "C", "/", "\n",
+        "7", "8", "9", "*", "\n",
+        "4", "5", "6", "-", "\n",
+        "1", "2", "3", "+", "\n",
+        "0", "=", "", "", ""
+    };
+
+    lv_obj_t* buttonmatrix = lv_buttonmatrix_create(parent);
+    lv_buttonmatrix_set_map(buttonmatrix, btn_map);
+
+    lv_obj_set_style_pad_all(buttonmatrix, 5, LV_PART_MAIN);
+    lv_obj_set_style_pad_row(buttonmatrix, 10, LV_PART_MAIN);
+    lv_obj_set_style_pad_column(buttonmatrix, 5, LV_PART_MAIN);
+    lv_obj_set_style_border_width(buttonmatrix, 2, LV_PART_MAIN);
+    lv_obj_set_style_bg_color(buttonmatrix, lv_palette_main(LV_PALETTE_BLUE), LV_PART_ITEMS);
+
+    if (lv_display_get_horizontal_resolution(nullptr) <= 240 || lv_display_get_vertical_resolution(nullptr) <= 240) {
+        //small screens
+        lv_obj_set_size(buttonmatrix, lv_pct(100), lv_pct(60));
+    } else {
+        //large screens
+        lv_obj_set_size(buttonmatrix, lv_pct(100), lv_pct(80));
+    }
+    lv_obj_align(buttonmatrix, LV_ALIGN_BOTTOM_MID, 0, -5);
+
+    lv_obj_add_event_cb(buttonmatrix, button_event_cb, LV_EVENT_VALUE_CHANGED, this);
+}

Apps/Calculator/main/Source/Calculator.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "tt_app.h"
+
+#include <lvgl.h>
+#include "Str.h"
+#include "Dequeue.h"
+
+class Calculator {
+
+    lv_obj_t* displayLabel;
+    lv_obj_t* resultLabel;
+    char formulaBuffer[128] = {0}; // Stores the full input expression
+    bool newInput = true;
+
+    static void button_event_cb(lv_event_t* e);
+    void handleInput(const char* txt);
+    void evaluateExpression();
+    double computeFormula();
+    static Dequeue<Str> infixToRPN(const Str& infix);
+    static double evaluateRPN(Dequeue<Str> rpnQueue);
+    void resetCalculator();
+
+public:
+
+    void onShow(AppHandle context, lv_obj_t* parent);
+};

Apps/Calculator/main/Source/Dequeue.h

@@ -0,0 +1,95 @@
+#pragma once
+
+template <typename DataType>
+class Dequeue {
+
+    struct Node {
+        DataType data;
+        Node* next;
+        Node* previous;
+
+        Node(DataType data, Node* next, Node* previous):
+            data(data),
+            next(next),
+            previous(previous)
+        {}
+    };
+
+    int count = 0;
+    Node* head = nullptr;
+    Node* tail = nullptr;
+
+public:
+
+    void pushFront(DataType data) {
+        auto* new_node = new Node(data, head, nullptr);
+
+        if (head != nullptr) {
+            head->previous = new_node;
+        }
+
+        if (tail == nullptr) {
+            tail = new_node;
+        }
+
+        head = new_node;
+        count++;
+    }
+
+    void pushBack(DataType data) {
+        auto* new_node = new Node(data, nullptr, tail);
+
+        if (head == nullptr) {
+            head = new_node;
+        }
+
+        if (tail != nullptr) {
+            tail->next = new_node;
+        }
+
+        tail = new_node;
+        count++;
+    }
+
+    void popFront() {
+        if (head != nullptr) {
+            bool is_last_node = (head == tail);
+            Node* node_to_delete = head;
+            head = node_to_delete->next;
+            if (is_last_node) {
+                tail = nullptr;
+            }
+            delete node_to_delete;
+            count--;
+        }
+    }
+
+    void popBack() {
+        if (tail != nullptr) {
+            bool is_last_node = (head == tail);
+            Node* node_to_delete = tail;
+            tail = node_to_delete->previous;
+            if (is_last_node) {
+                head = nullptr;
+            }
+            delete node_to_delete;
+            count--;
+        }
+    }
+
+    DataType back() const {
+        assert(tail != nullptr);
+        return tail->data;
+    }
+
+    DataType front() const {
+        assert(head != nullptr);
+        return head->data;
+    }
+
+    bool empty() const {
+        return head == nullptr;
+    }
+
+    int size() const { return count; }
+};

Apps/Calculator/main/Source/Stack.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Dequeue.h"
+
+template <typename DataType>
+class Stack {
+
+    Dequeue<DataType> dequeue;
+
+public:
+
+    void push(DataType data) { dequeue.pushFront(data); }
+
+    void pop() { dequeue.popFront(); }
+
+    DataType top() const { return dequeue.front(); }
+
+    bool empty() const { return dequeue.empty(); }
+
+    int size() const { return dequeue.size(); }
+};

Apps/Calculator/main/Source/Str.cpp

@@ -0,0 +1,2 @@
+#define STR_IMPLEMENTATION
+#include "Str.h"

Apps/Calculator/main/Source/Str.h

@@ -0,0 +1,618 @@
+// Str v0.33
+// Simple C++ string type with an optional local buffer, by Omar Cornut
+// https://github.com/ocornut/str
+
+// LICENSE
+//  This software is in the public domain. Where that dedication is not
+//  recognized, you are granted a perpetual, irrevocable license to copy,
+//  distribute, and modify this file as you see fit.
+
+// USAGE
+//  Include this file in whatever places need to refer to it.
+//  In ONE .cpp file, write '#define STR_IMPLEMENTATION' before the #include of this file.
+//  This expands out the actual implementation into that C/C++ file.
+
+
+/*
+- This isn't a fully featured string class.
+- It is a simple, bearable replacement to std::string that isn't heap abusive nor bloated (can actually be debugged by humans).
+- String are mutable. We don't maintain size so length() is not-constant time.
+- Maximum string size currently limited to 2 MB (we allocate 21 bits to hold capacity).
+- Local buffer size is currently limited to 1023 bytes (we allocate 10 bits to hold local buffer size).
+- In "non-owned" mode for literals/reference we don't do any tracking/counting of references.
+- Overhead is 8-bytes in 32-bits, 16-bytes in 64-bits (12 + alignment).
+- This code hasn't been tested very much. it is probably incomplete or broken. Made it for my own use.
+
+The idea is that you can provide an arbitrary sized local buffer if you expect string to fit
+most of the time, and then you avoid using costly heap.
+
+No local buffer, always use heap, sizeof()==8~16 (depends if your pointers are 32-bits or 64-bits)
+
+   Str s = "hey";
+
+With a local buffer of 16 bytes, sizeof() == 8~16 + 16 bytes.
+
+   Str16 s = "filename.h"; // copy into local buffer
+   Str16 s = "long_filename_not_very_long_but_longer_than_expected.h";   // use heap
+
+With a local buffer of 256 bytes, sizeof() == 8~16 + 256 bytes.
+
+   Str256 s = "long_filename_not_very_long_but_longer_than_expected.h";  // copy into local buffer
+
+Common sizes are defined at the bottom of Str.h, you may define your own.
+
+Functions:
+
+   Str256 s;
+   s.set("hello sailor");                   // set (copy)
+   s.setf("%s/%s.tmp", folder, filename);   // set (w/format)
+   s.append("hello");                       // append. cost a length() calculation!
+   s.appendf("hello %d", 42);               // append (w/format). cost a length() calculation!
+   s.set_ref("Hey!");                       // set (literal/reference, just copy pointer, no tracking)
+
+Constructor helper for format string: add a trailing 'f' to the type. Underlying type is the same.
+
+   Str256f filename("%s/%s.tmp", folder, filename);             // construct (w/format)
+   fopen(Str256f("%s/%s.tmp, folder, filename).c_str(), "rb");  // construct (w/format), use as function param, destruct
+
+Constructor helper for reference/literal:
+
+   StrRef ref("literal");                   // copy pointer, no allocation, no string copy
+   StrRef ref2(GetDebugName());             // copy pointer. no tracking of anything whatsoever, know what you are doing!
+
+All StrXXX types derives from Str and instance hold the local buffer capacity. So you can pass e.g. Str256* to a function taking base type Str* and it will be functional.
+
+   void MyFunc(Str& s) { s = "Hello"; }     // will use local buffer if available in Str instance
+
+(Using a template e.g. Str<N> we could remove the LocalBufSize storage but it would make passing typed Str<> to functions tricky.
+ Instead we don't use template so you can pass them around as the base type Str*. Also, templates are ugly.)
+*/
+
+/*
+ CHANGELOG
+  0.33 - fixed capacity() return value to match standard. e.g. a Str256's capacity() now returns 255, not 256.
+  0.32 - added owned() accessor.
+  0.31 - fixed various warnings.
+  0.30 - turned into a single header file, removed Str.cpp.
+  0.29 - fixed bug when calling reserve on non-owned strings (ie. when using StrRef or set_ref), and fixed <string> include.
+  0.28 - breaking change: replaced Str32 by Str30 to avoid collision with Str32 from MacTypes.h .
+  0.27 - added STR_API and basic .natvis file.
+  0.26 - fixed set(cont char* src, const char* src_end) writing null terminator to the wrong position.
+  0.25 - allow set(const char* NULL) or operator= NULL to clear the string. note that set() from range or other types are not allowed.
+  0.24 - allow set_ref(const char* NULL) to clear the string. include fixes for linux.
+  0.23 - added append(char). added append_from(int idx, XXX) functions. fixed some compilers warnings.
+  0.22 - documentation improvements, comments. fixes for some compilers.
+  0.21 - added StrXXXf() constructor to construct directly from a format string.
+*/
+
+/*
+TODO
+- Since we lose 4-bytes of padding on 64-bits architecture, perhaps just spread the header to 8-bytes and lift size limits?
+- More functions/helpers.
+*/
+
+#ifndef STR_INCLUDED
+#define STR_INCLUDED
+
+//-------------------------------------------------------------------------
+// CONFIGURATION
+//-------------------------------------------------------------------------
+
+#ifndef STR_MEMALLOC
+#define STR_MEMALLOC  malloc
+#include <cstdio>
+#endif
+#ifndef STR_MEMFREE
+#define STR_MEMFREE   free
+#include <cstdlib>
+#endif
+#ifndef STR_ASSERT
+#define STR_ASSERT    assert
+#include <cassert>
+#endif
+#ifndef STR_API
+#define STR_API
+#endif
+#include <cstdarg>   // for va_list
+#include <cstring>   // for strlen, strcmp, memcpy, etc.
+
+// Configuration: #define STR_DEFINE_STR32 1 to keep defining Str32/Str32f, but be warned: on macOS/iOS, MacTypes.h also defines a type named Str32.
+#ifndef STR_DEFINE_STR32
+#define STR_DEFINE_STR32 0
+#endif
+
+//-------------------------------------------------------------------------
+// HEADERS
+//-------------------------------------------------------------------------
+
+// This is the base class that you can pass around
+// Footprint is 8-bytes (32-bits arch) or 16-bytes (64-bits arch)
+class STR_API Str
+{
+    char*               Data;                   // Point to LocalBuf() or heap allocated
+    int                 Capacity : 21;          // Max 2 MB. Exclude zero terminator.
+    int                 LocalBufSize : 10;      // Max 1023 bytes
+    unsigned int        Owned : 1;              // Set when we have ownership of the pointed data (most common, unless using set_ref() method or StrRef constructor)
+
+public:
+    inline char*        c_str()                                 { return Data; }
+    inline const char*  c_str() const                           { return Data; }
+    inline bool         empty() const                           { return Data[0] == 0; }
+    inline int          length() const                          { return (int)strlen(Data); }    // by design, allow user to write into the buffer at any time
+    inline int          capacity() const                        { return Capacity; }
+    inline bool         owned() const                           { return Owned ? true : false; }
+
+    inline void         set_ref(const char* src);
+    int                 setf(const char* fmt, ...);
+    int                 setfv(const char* fmt, va_list args);
+    int                 setf_nogrow(const char* fmt, ...);
+    int                 setfv_nogrow(const char* fmt, va_list args);
+    int                 append(char c);
+    int                 append(const char* s, const char* s_end = NULL);
+    int                 appendf(const char* fmt, ...);
+    int                 appendfv(const char* fmt, va_list args);
+    int                 append_from(int idx, char c);
+    int                 append_from(int idx, const char* s, const char* s_end = NULL);		// If you know the string length or want to append from a certain point
+    int                 appendf_from(int idx, const char* fmt, ...);
+    int                 appendfv_from(int idx, const char* fmt, va_list args);
+
+    void                clear();
+    void                reserve(int cap);
+    void                reserve_discard(int cap);
+    void                shrink_to_fit();
+
+    inline char&        operator[](size_t i)                    { return Data[i]; }
+    inline char         operator[](size_t i) const              { return Data[i]; }
+    //explicit operator const char*() const{ return Data; }
+
+    inline Str();
+    inline Str(const char* rhs);
+    inline void         set(const char* src);
+    inline void         set(const char* src, const char* src_end);
+    inline Str&         operator=(const char* rhs)              { set(rhs); return *this; }
+    inline bool         operator==(const char* rhs) const       { return strcmp(c_str(), rhs) == 0; }
+
+    inline Str(const Str& rhs);
+    inline void         set(const Str& src);
+    inline void         set(int count, char character);
+    inline Str&         operator=(const Str& rhs)               { set(rhs); return *this; }
+    inline bool         operator==(const Str& rhs) const        { return strcmp(c_str(), rhs.c_str()) == 0; }
+
+    inline Str(int amount, char character);
+
+    // Destructor for all variants
+    inline ~Str()
+    {
+        if (Owned && !is_using_local_buf())
+            STR_MEMFREE(Data);
+    }
+
+    static char*        EmptyBuffer;
+
+protected:
+    inline char*        local_buf()                             { return (char*)this + sizeof(Str); }
+    inline const char*  local_buf() const                       { return (char*)this + sizeof(Str); }
+    inline bool         is_using_local_buf() const              { return Data == local_buf() && LocalBufSize != 0; }
+
+    // Constructor for StrXXX variants with local buffer
+    Str(unsigned short local_buf_size)
+    {
+        STR_ASSERT(local_buf_size < 1024);
+        Data = local_buf();
+        Data[0] = '\0';
+        Capacity = local_buf_size ? local_buf_size - 1 : 0;
+        LocalBufSize = local_buf_size;
+        Owned = 1;
+    }
+};
+
+void    Str::set(const char* src)
+{
+    // We allow set(NULL) or via = operator to clear the string.
+    if (src == NULL)
+    {
+        clear();
+        return;
+    }
+    int buf_len = (int)strlen(src);
+    if (Capacity < buf_len)
+        reserve_discard(buf_len);
+    memcpy(Data, src, (size_t)(buf_len + 1));
+    Owned = 1;
+}
+
+void    Str::set(const char* src, const char* src_end)
+{
+    STR_ASSERT(src != NULL && src_end >= src);
+    int buf_len = (int)(src_end - src);
+    if ((int)Capacity < buf_len)
+        reserve_discard(buf_len);
+    memcpy(Data, src, (size_t)buf_len);
+    Data[buf_len] = 0;
+    Owned = 1;
+}
+
+void    Str::set(const Str& src)
+{
+    int buf_len = (int)strlen(src.c_str());
+    if ((int)Capacity < buf_len)
+        reserve_discard(buf_len);
+    memcpy(Data, src.c_str(), (size_t)(buf_len + 1));
+    Owned = 1;
+}
+
+void    Str::set(int count, char character) {
+    int buf_len = count + 1;
+    if ((int)Capacity < buf_len)
+        reserve_discard(buf_len);
+    memset(Data, character, count);
+    Data[count] = 0;
+    Owned = 1;
+}
+
+inline void Str::set_ref(const char* src)
+{
+    if (Owned && !is_using_local_buf())
+        STR_MEMFREE(Data);
+    Data = src ? (char*)src : EmptyBuffer;
+    Capacity = 0;
+    Owned = 0;
+}
+
+Str::Str()
+{
+    Data = EmptyBuffer;      // Shared READ-ONLY initial buffer for 0 capacity
+    Capacity = 0;
+    LocalBufSize = 0;
+    Owned = 0;
+}
+
+Str::Str(const Str& rhs) : Str()
+{
+    set(rhs);
+}
+
+Str::Str(const char* rhs) : Str()
+{
+    set(rhs);
+}
+
+Str::Str(int amount, char character) : Str() {
+    set(amount, character);
+}
+
+// Literal/reference string
+class StrRef : public Str
+{
+public:
+    StrRef(const char* s) : Str() { set_ref(s); }
+};
+
+#define STR_DEFINETYPE(TYPENAME, LOCALBUFSIZE)                                      \
+class TYPENAME : public Str                                                         \
+{                                                                                   \
+    char local_buf[LOCALBUFSIZE];                                                   \
+public:                                                                             \
+    TYPENAME() : Str(LOCALBUFSIZE) {}                                               \
+    TYPENAME(const Str& rhs) : Str(LOCALBUFSIZE) { set(rhs); }                      \
+    TYPENAME(const char* rhs) : Str(LOCALBUFSIZE) { set(rhs); }                     \
+    TYPENAME(const TYPENAME& rhs) : Str(LOCALBUFSIZE) { set(rhs); }                 \
+    TYPENAME&   operator=(const char* rhs)          { set(rhs); return *this; }     \
+    TYPENAME&   operator=(const Str& rhs)           { set(rhs); return *this; }     \
+    TYPENAME&   operator=(const TYPENAME& rhs)      { set(rhs); return *this; }     \
+};
+
+// Disable PVS-Studio warning V730: Not all members of a class are initialized inside the constructor (local_buf is not initialized and that is fine)
+// -V:STR_DEFINETYPE:730
+
+// Helper to define StrXXXf constructors
+#define STR_DEFINETYPE_F(TYPENAME, TYPENAME_F)                                      \
+class TYPENAME_F : public TYPENAME                                                  \
+{                                                                                   \
+public:                                                                             \
+    TYPENAME_F(const char* fmt, ...) : TYPENAME() { va_list args; va_start(args, fmt); setfv(fmt, args); va_end(args); } \
+};
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-private-field"         // warning : private field 'local_buf' is not used
+#endif
+
+// Declaring types for common sizes here
+STR_DEFINETYPE(Str16, 16)
+STR_DEFINETYPE(Str30, 30)
+STR_DEFINETYPE(Str64, 64)
+STR_DEFINETYPE(Str128, 128)
+STR_DEFINETYPE(Str256, 256)
+STR_DEFINETYPE(Str512, 512)
+
+// Declaring helper constructors to pass in format strings in one statement
+STR_DEFINETYPE_F(Str16, Str16f)
+STR_DEFINETYPE_F(Str30, Str30f)
+STR_DEFINETYPE_F(Str64, Str64f)
+STR_DEFINETYPE_F(Str128, Str128f)
+STR_DEFINETYPE_F(Str256, Str256f)
+STR_DEFINETYPE_F(Str512, Str512f)
+
+#if STR_DEFINE_STR32
+STR_DEFINETYPE(Str32, 32)
+STR_DEFINETYPE_F(Str32, Str32f)
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#endif // #ifndef STR_INCLUDED
+
+//-------------------------------------------------------------------------
+// IMPLEMENTATION
+//-------------------------------------------------------------------------
+
+#ifdef STR_IMPLEMENTATION
+
+#include <stdio.h> // for vsnprintf
+
+// On some platform vsnprintf() takes va_list by reference and modifies it.
+// va_copy is the 'correct' way to copy a va_list but Visual Studio prior to 2013 doesn't have it.
+#ifndef va_copy
+#define va_copy(dest, src) (dest = src)
+#endif
+
+// Static empty buffer we can point to for empty strings
+// Pointing to a literal increases the like-hood of getting a crash if someone attempts to write in the empty string buffer.
+char*   Str::EmptyBuffer = (char*)"\0NULL";
+
+// Clear
+void    Str::clear()
+{
+    if (Owned && !is_using_local_buf())
+        STR_MEMFREE(Data);
+    if (LocalBufSize)
+    {
+        Data = local_buf();
+        Data[0] = '\0';
+        Capacity = LocalBufSize - 1;
+        Owned = 1;
+    }
+    else
+    {
+        Data = EmptyBuffer;
+        Capacity = 0;
+        Owned = 0;
+    }
+}
+
+// Reserve memory, preserving the current of the buffer
+// Capacity doesn't include the zero terminator, so reserve(5) is enough to store "hello".
+void    Str::reserve(int new_capacity)
+{
+    if (new_capacity <= Capacity)
+        return;
+
+    char* new_data;
+    if (new_capacity <= LocalBufSize - 1)
+    {
+        // Disowned -> LocalBuf
+        new_data = local_buf();
+        new_capacity = LocalBufSize - 1;
+    }
+    else
+    {
+        // Disowned or LocalBuf -> Heap
+        new_data = (char*)STR_MEMALLOC((size_t)(new_capacity + 1) * sizeof(char));
+    }
+
+    // string in Data might be longer than new_capacity if it wasn't owned, don't copy too much
+#ifdef _MSC_VER
+    strncpy_s(new_data, (size_t)new_capacity + 1, Data, (size_t)new_capacity);
+#else
+    strncpy(new_data, Data, (size_t)new_capacity);
+#endif
+    new_data[new_capacity] = 0;
+
+    if (Owned && !is_using_local_buf())
+        STR_MEMFREE(Data);
+
+    Data = new_data;
+    Capacity = new_capacity;
+    Owned = 1;
+}
+
+// Reserve memory, discarding the current of the buffer (if we expect to be fully rewritten)
+void    Str::reserve_discard(int new_capacity)
+{
+    if (new_capacity <= Capacity)
+        return;
+
+    if (Owned && !is_using_local_buf())
+        STR_MEMFREE(Data);
+
+    if (new_capacity <= LocalBufSize - 1)
+    {
+        // Disowned -> LocalBuf
+        Data = local_buf();
+        Capacity = LocalBufSize - 1;
+    }
+    else
+    {
+        // Disowned or LocalBuf -> Heap
+        Data = (char*)STR_MEMALLOC((size_t)(new_capacity + 1) * sizeof(char));
+        Capacity = new_capacity;
+    }
+    Owned = 1;
+}
+
+void    Str::shrink_to_fit()
+{
+    if (!Owned || is_using_local_buf())
+        return;
+    int new_capacity = length();
+    if (Capacity <= new_capacity)
+        return;
+
+    char* new_data = (char*)STR_MEMALLOC((size_t)(new_capacity + 1) * sizeof(char));
+    memcpy(new_data, Data, (size_t)(new_capacity + 1));
+    STR_MEMFREE(Data);
+    Data = new_data;
+    Capacity = new_capacity;
+}
+
+// FIXME: merge setfv() and appendfv()?
+int     Str::setfv(const char* fmt, va_list args)
+{
+    // Needed for portability on platforms where va_list are passed by reference and modified by functions
+    va_list args2;
+    va_copy(args2, args);
+
+    // MSVC returns -1 on overflow when writing, which forces us to do two passes
+    // FIXME-OPT: Find a way around that.
+#ifdef _MSC_VER
+    int len = vsnprintf(NULL, 0, fmt, args);
+    STR_ASSERT(len >= 0);
+
+    if (Capacity < len)
+        reserve_discard(len);
+    len = vsnprintf(Data, (size_t)len + 1, fmt, args2);
+#else
+    // First try
+    int len = vsnprintf(Owned ? Data : NULL, Owned ? (size_t)(Capacity + 1): 0, fmt, args);
+    STR_ASSERT(len >= 0);
+
+    if (Capacity < len)
+    {
+        reserve_discard(len);
+        len = vsnprintf(Data, (size_t)len + 1, fmt, args2);
+    }
+#endif
+
+    STR_ASSERT(Owned);
+    return len;
+}
+
+int     Str::setf(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    int len = setfv(fmt, args);
+    va_end(args);
+    return len;
+}
+
+int     Str::setfv_nogrow(const char* fmt, va_list args)
+{
+    STR_ASSERT(Owned);
+
+    if (Capacity == 0)
+        return 0;
+
+    int w = vsnprintf(Data, (size_t)(Capacity + 1), fmt, args);
+    Data[Capacity] = 0;
+    Owned = 1;
+    return (w == -1) ? Capacity : w;
+}
+
+int     Str::setf_nogrow(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    int len = setfv_nogrow(fmt, args);
+    va_end(args);
+    return len;
+}
+
+int     Str::append_from(int idx, char c)
+{
+    int add_len = 1;
+    if (Capacity < idx + add_len)
+        reserve(idx + add_len);
+    Data[idx] = c;
+    Data[idx + add_len] = 0;
+    STR_ASSERT(Owned);
+    return add_len;
+}
+
+int     Str::append_from(int idx, const char* s, const char* s_end)
+{
+    if (!s_end)
+        s_end = s + strlen(s);
+    int add_len = (int)(s_end - s);
+    if (Capacity < idx + add_len)
+        reserve(idx + add_len);
+    memcpy(Data + idx, (const void*)s, (size_t)add_len);
+    Data[idx + add_len] = 0; // Our source data isn't necessarily zero terminated
+    STR_ASSERT(Owned);
+    return add_len;
+}
+
+// FIXME: merge setfv() and appendfv()?
+int     Str::appendfv_from(int idx, const char* fmt, va_list args)
+{
+    // Needed for portability on platforms where va_list are passed by reference and modified by functions
+    va_list args2;
+    va_copy(args2, args);
+
+    // MSVC returns -1 on overflow when writing, which forces us to do two passes
+    // FIXME-OPT: Find a way around that.
+#ifdef _MSC_VER
+    int add_len = vsnprintf(NULL, 0, fmt, args);
+    STR_ASSERT(add_len >= 0);
+
+    if (Capacity < idx + add_len)
+        reserve(idx + add_len);
+    add_len = vsnprintf(Data + idx, add_len + 1, fmt, args2);
+#else
+    // First try
+    int add_len = vsnprintf(Owned ? Data + idx : NULL, Owned ? (size_t)(Capacity + 1 - idx) : 0, fmt, args);
+    STR_ASSERT(add_len >= 0);
+
+    if (Capacity < idx + add_len)
+    {
+        reserve(idx + add_len);
+        add_len = vsnprintf(Data + idx, (size_t)add_len + 1, fmt, args2);
+    }
+#endif
+
+    STR_ASSERT(Owned);
+    return add_len;
+}
+
+int     Str::appendf_from(int idx, const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    int len = appendfv_from(idx, fmt, args);
+    va_end(args);
+    return len;
+}
+
+int     Str::append(char c)
+{
+    int cur_len = length();
+    return append_from(cur_len, c);
+}
+
+int     Str::append(const char* s, const char* s_end)
+{
+    int cur_len = length();
+    return append_from(cur_len, s, s_end);
+}
+
+int     Str::appendfv(const char* fmt, va_list args)
+{
+    int cur_len = length();
+    return appendfv_from(cur_len, fmt, args);
+}
+
+int     Str::appendf(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    int len = appendfv(fmt, args);
+    va_end(args);
+    return len;
+}
+
+#endif // #define STR_IMPLEMENTATION
+
+//-------------------------------------------------------------------------

Apps/Calculator/main/Source/main.cpp

@@ -0,0 +1,29 @@
+#include <tt_app.h>
+#include "Calculator.h"
+
+static void onShow(AppHandle appHandle, void* data, lv_obj_t* parent) {
+    static_cast<Calculator*>(data)->onShow(appHandle, parent);
+}
+
+static void* createApp() {
+    return new Calculator();
+}
+
+static void destroyApp(void* app) {
+    delete static_cast<Calculator*>(app);
+}
+
+ExternalAppManifest manifest = {
+    .createData = createApp,
+    .destroyData = destroyApp,
+    .onShow = onShow,
+};
+
+extern "C" {
+
+int main(int argc, char* argv[]) {
+    tt_app_register(&manifest);
+    return 0;
+}
+
+}

Apps/Calculator/manifest.properties

@@ -0,0 +1,10 @@
+[manifest]
+version=0.1
+[target]
+sdk=0.6.0-SNAPSHOT1
+platforms=esp32,esp32s3
+[app]
+id=one.tactility.calculator
+versionName=0.1.0
+versionCode=1
+name=Calculator

Apps/Calculator/tactility.py

@@ -0,0 +1,630 @@
+import configparser
+import json
+import os
+import re
+import shutil
+import sys
+import subprocess
+import time
+import urllib.request
+import zipfile
+import requests
+import tarfile
+import shutil
+import configparser
+
+ttbuild_path = ".tactility"
+ttbuild_version = "2.2.0"
+ttbuild_cdn = "https://cdn.tactility.one"
+ttbuild_sdk_json_validity = 3600  # seconds
+ttport = 6666
+verbose = False
+use_local_sdk = False
+valid_platforms = ["esp32", "esp32s3"]
+
+spinner_pattern = [
+    "⠋",
+    "⠙",
+    "⠹",
+    "⠸",
+    "⠼",
+    "⠴",
+    "⠦",
+    "⠧",
+    "⠇",
+    "⠏"
+]
+
+if sys.platform == "win32":
+    shell_color_red = ""
+    shell_color_orange = ""
+    shell_color_green = ""
+    shell_color_purple = ""
+    shell_color_cyan = ""
+    shell_color_reset = ""
+else:
+    shell_color_red = "\033[91m"
+    shell_color_orange = "\033[93m"
+    shell_color_green = "\033[32m"
+    shell_color_purple = "\033[35m"
+    shell_color_cyan = "\033[36m"
+    shell_color_reset = "\033[m"
+
+def print_help():
+    print("Usage: python tactility.py [action] [options]")
+    print("")
+    print("Actions:")
+    print("  build [esp32,esp32s3]          Build the app. Optionally specify a platform.")
+    print("    esp32:         ESP32")
+    print("    esp32s3:       ESP32 S3")
+    print("  clean                          Clean the build folders")
+    print("  clearcache                     Clear the SDK cache")
+    print("  updateself                     Update this tool")
+    print("  run [ip]                       Run the application")
+    print("  install [ip]                   Install the application")
+    print("  uninstall [ip]                 Uninstall the application")
+    print("  bir [ip] [esp32,esp32s3]       Build, install then run. Optionally specify a platform.")
+    print("  brrr [ip] [esp32,esp32s3]      Functionally the same as \"bir\", but \"app goes brrr\" meme variant.")
+    print("")
+    print("Options:")
+    print("  --help                         Show this commandline info")
+    print("  --local-sdk                    Use SDK specified by environment variable TACTILITY_SDK_PATH")
+    print("  --skip-build                   Run everything except the idf.py/CMake commands")
+    print("  --verbose                      Show extra console output")
+
+# region Core
+
+def download_file(url, filepath):
+    global verbose
+    if verbose:
+        print(f"Downloading from {url} to {filepath}")
+    request = urllib.request.Request(
+        url,
+        data=None,
+        headers={
+            "User-Agent": f"Tactility Build Tool {ttbuild_version}"
+        }
+    )
+    try:
+        response = urllib.request.urlopen(request)
+        file = open(filepath, mode="wb")
+        file.write(response.read())
+        file.close()
+        return True
+    except OSError as error:
+        if verbose:
+            print_error(f"Failed to fetch URL {url}\n{error}")
+        return False
+
+def print_warning(message):
+    print(f"{shell_color_orange}WARNING: {message}{shell_color_reset}")
+
+def print_error(message):
+    print(f"{shell_color_red}ERROR: {message}{shell_color_reset}")
+
+def exit_with_error(message):
+    print_error(message)
+    sys.exit(1)
+
+def get_url(ip, path):
+    return f"http://{ip}:{ttport}{path}"
+
+def read_properties_file(path):
+    config = configparser.RawConfigParser()
+    config.read(path)
+    return config
+
+#endregion Core
+
+#region SDK helpers
+
+def read_sdk_json():
+    json_file_path = os.path.join(ttbuild_path, "sdk.json")
+    json_file = open(json_file_path)
+    return json.load(json_file)
+
+def get_sdk_dir(version, platform):
+    global use_local_sdk
+    if use_local_sdk:
+        return os.environ.get("TACTILITY_SDK_PATH")
+    else:
+        global ttbuild_cdn
+        return os.path.join(ttbuild_path, f"{version}-{platform}", "TactilitySDK")
+
+def get_sdk_root_dir(version, platform):
+    global ttbuild_cdn
+    return os.path.join(ttbuild_path, f"{version}-{platform}")
+
+def get_sdk_url(version, platform):
+    global ttbuild_cdn
+    return f"{ttbuild_cdn}/TactilitySDK-{version}-{platform}.zip"
+
+def sdk_exists(version, platform):
+    sdk_dir = get_sdk_dir(version, platform)
+    return os.path.isdir(sdk_dir)
+
+def should_update_sdk_json():
+    global ttbuild_cdn
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    if os.path.exists(json_filepath):
+        json_modification_time = os.path.getmtime(json_filepath)
+        now = time.time()
+        global ttbuild_sdk_json_validity
+        minimum_seconds_difference = ttbuild_sdk_json_validity
+        return (now - json_modification_time) > minimum_seconds_difference
+    else:
+        return True
+
+def update_sdk_json():
+    global ttbuild_cdn, ttbuild_path
+    json_url = f"{ttbuild_cdn}/sdk.json"
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    return download_file(json_url, json_filepath)
+
+def should_fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        if not os.path.exists(os.path.join(ttbuild_path, sdkconfig_filename)):
+            return True
+    return False
+
+def fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        target_path = os.path.join(ttbuild_path, sdkconfig_filename)
+        if not download_file(f"{ttbuild_cdn}/{sdkconfig_filename}", target_path):
+            exit_with_error(f"Failed to download sdkconfig file for {platform}")
+
+#endregion SDK helpers
+
+#region Validation
+
+def validate_environment():
+    if os.environ.get("IDF_PATH") is None:
+        exit_with_error("Cannot find the Espressif IDF SDK. Ensure it is installed and that it is activated via $PATH_TO_IDF_SDK/export.sh")
+    if not os.path.exists("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    if use_local_sdk == False and os.environ.get("TACTILITY_SDK_PATH") is not None:
+        print_warning("TACTILITY_SDK_PATH is set, but will be ignored by this command.")
+        print_warning("If you want to use it, use the 'build local' parameters.")
+    elif use_local_sdk == True and os.environ.get("TACTILITY_SDK_PATH") is None:
+        exit_with_error("local build was requested, but TACTILITY_SDK_PATH environment variable is not set.")
+
+def validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build):
+    version_map = sdk_json["versions"]
+    if not sdk_version in version_map:
+        exit_with_error(f"Version not found: {sdk_version}")
+    version_data = version_map[sdk_version]
+    available_platforms = version_data["platforms"]
+    for desired_platform in platforms_to_build:
+        if not desired_platform in available_platforms:
+            exit_with_error(f"Platform {desired_platform} is not available. Available ones: {available_platforms}")
+
+def validate_self(sdk_json):
+    if not "toolVersion" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolVersion not found)")
+    if not "toolCompatibility" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolCompatibility not found)")
+    if not "toolDownloadUrl" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolDownloadUrl not found)")
+    tool_version = sdk_json["toolVersion"]
+    tool_compatibility = sdk_json["toolCompatibility"]
+    if tool_version != ttbuild_version:
+        print_warning(f"New version available: {tool_version} (currently using {ttbuild_version})")
+        print_warning(f"Run 'tactility.py updateself' to update.")
+    if re.search(tool_compatibility, ttbuild_version) is None:
+        print_error("The tool is not compatible anymore.")
+        print_error("Run 'tactility.py updateself' to update.")
+        sys.exit(1)
+
+#endregion Validation
+
+#region Manifest
+
+def read_manifest():
+    return read_properties_file("manifest.properties")
+
+def validate_manifest(manifest):
+    # [manifest]
+    if not "manifest" in manifest:
+        exit_with_error("Invalid manifest format: [manifest] not found")
+    if not "version" in manifest["manifest"]:
+        exit_with_error("Invalid manifest format: [manifest] version not found")
+    # [target]
+    if not "target" in manifest:
+        exit_with_error("Invalid manifest format: [target] not found")
+    if not "sdk" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] sdk not found")
+    if not "platforms" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] platforms not found")
+    # [app]
+    if not "app" in manifest:
+        exit_with_error("Invalid manifest format: [app] not found")
+    if not "id" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] id not found")
+    if not "versionName" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionName not found")
+    if not "versionCode" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionCode not found")
+    if not "name" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] name not found")
+
+def is_valid_manifest_platform(manifest, platform):
+    manifest_platforms = manifest["target"]["platforms"].split(",")
+    return platform in manifest_platforms
+
+def validate_manifest_platform(manifest, platform):
+    if not is_valid_manifest_platform(manifest, platform):
+        exit_with_error(f"Platform {platform} is not available in the manifest.")
+
+def get_manifest_target_platforms(manifest, requested_platform):
+    if requested_platform == "" or requested_platform is None:
+        return manifest["target"]["platforms"].split(",")
+    else:
+        validate_manifest_platform(manifest, requested_platform)
+        return [requested_platform]
+
+#endregion Manifest
+
+#region SDK download
+
+def sdk_download(version, platform):
+    sdk_root_dir = get_sdk_root_dir(version, platform)
+    os.makedirs(sdk_root_dir, exist_ok=True)
+    sdk_url = get_sdk_url(version, platform)
+    filepath = os.path.join(sdk_root_dir, f"{version}-{platform}.zip")
+    print(f"Downloading SDK version {version} for {platform}")
+    if download_file(sdk_url, filepath):
+        with zipfile.ZipFile(filepath, "r") as zip_ref:
+            zip_ref.extractall(os.path.join(sdk_root_dir, "TactilitySDK"))
+        return True
+    else:
+        return False
+
+def sdk_download_all(version, platforms):
+    for platform in platforms:
+        if not sdk_exists(version, platform):
+            if not sdk_download(version, platform):
+                return False
+        else:
+            if verbose:
+                print(f"Using cached download for SDK version {version} and platform {platform}")
+    return True
+
+#endregion SDK download
+
+#region Building
+
+def get_cmake_path(platform):
+    return os.path.join("build", f"cmake-build-{platform}")
+
+def find_elf_file(platform):
+    cmake_dir = get_cmake_path(platform)
+    if os.path.exists(cmake_dir):
+        for file in os.listdir(cmake_dir):
+            if file.endswith(".app.elf"):
+                return os.path.join(cmake_dir, file)
+    return None
+
+def build_all(version, platforms, skip_build):
+    for platform in platforms:
+        # First build command must be "idf.py build", otherwise it fails to execute "idf.py elf"
+        # We check if the ELF file exists and run the correct command
+        # This can lead to code caching issues, so sometimes a clean build is required
+        if find_elf_file(platform) is None:
+            if not build_first(version, platform, skip_build):
+                break
+        else:
+            if not build_consecutively(version, platform, skip_build):
+                break
+
+def wait_for_build(process, platform):
+    buffer = []
+    os.set_blocking(process.stdout.fileno(), False)
+    while process.poll() is None:
+        for i in spinner_pattern:
+            time.sleep(0.1)
+            progress_text = f"Building for {platform} {shell_color_cyan}" + str(i) + shell_color_reset
+            sys.stdout.write(progress_text + "\r")
+            while True:
+                line = process.stdout.readline()
+                decoded_line = line.decode("UTF-8")
+                if decoded_line != "":
+                    buffer.append(decoded_line)
+                else:
+                    break
+    return buffer
+
+# The first build must call "idf.py build" and consecutive builds must call "idf.py elf" as it finishes faster.
+# The problem is that the "idf.py build" always results in an error, even though the elf file is created.
+# The solution is to suppress the error if we find that the elf file was created.
+def build_first(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    elf_path = find_elf_file(platform)
+    # Remove previous elf file: re-creation of the file is used to measure if the build succeeded,
+    # as the actual build job will always fail due to technical issues with the elf cmake script
+    if elf_path is not None:
+        os.remove(elf_path)
+    if skip_build:
+        return True
+    print("Building first build")
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "build"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        # The return code is never expected to be 0 due to a bug in the elf cmake script, but we keep it just in case
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            if find_elf_file(platform) is None:
+                for line in build_output:
+                    print(line, end="")
+                print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+                return False
+            else:
+                print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+                return True
+
+def build_consecutively(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    if skip_build:
+        return True
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "elf"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            for line in build_output:
+                print(line, end="")
+            print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+            return False
+
+#endregion Building
+
+#region Packaging
+
+def package_intermediate_manifest(target_path):
+    if not os.path.isfile("manifest.properties"):
+        print_error("manifest.properties not found")
+        return
+    shutil.copy("manifest.properties", os.path.join(target_path, "manifest.properties"))
+
+def package_intermediate_binaries(target_path, platforms):
+    elf_dir = os.path.join(target_path, "elf")
+    os.makedirs(elf_dir, exist_ok=True)
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            print_error(f"ELF file not found at {elf_path}")
+            return
+        shutil.copy(elf_path, os.path.join(elf_dir, f"{platform}.elf"))
+
+def package_intermediate_assets(target_path):
+    if os.path.isdir("assets"):
+        shutil.copytree("assets", os.path.join(target_path, "assets"), dirs_exist_ok=True)
+
+def package_intermediate(platforms):
+    target_path = os.path.join("build", "package-intermediate")
+    if os.path.isdir(target_path):
+        shutil.rmtree(target_path)
+    os.makedirs(target_path, exist_ok=True)
+    package_intermediate_manifest(target_path)
+    package_intermediate_binaries(target_path, platforms)
+    package_intermediate_assets(target_path)
+
+def package_name(platforms):
+    elf_path = find_elf_file(platforms[0])
+    elf_base_name = os.path.basename(elf_path).removesuffix(".app.elf")
+    return os.path.join("build", f"{elf_base_name}.app")
+
+def package_all(platforms):
+    print("Packaging app")
+    package_intermediate(platforms)
+    # Create build/something.app
+    tar_path = package_name(platforms)
+    tar = tarfile.open(tar_path, mode="w", format=tarfile.USTAR_FORMAT)
+    tar.add(os.path.join("build", "package-intermediate"), arcname="")
+    tar.close()
+
+#endregion Packaging
+
+def setup_environment():
+    global ttbuild_path
+    os.makedirs(ttbuild_path, exist_ok=True)
+
+def build_action(manifest, platform_arg):
+    # Environment validation
+    validate_environment()
+    platforms_to_build = get_manifest_target_platforms(manifest, platform_arg)
+    if not use_local_sdk:
+        if should_fetch_sdkconfig_files(platforms_to_build):
+            fetch_sdkconfig_files(platforms_to_build)
+        sdk_json = read_sdk_json()
+        validate_self(sdk_json)
+        if not "versions" in sdk_json:
+            exit_with_error("Version data not found in sdk.json")
+    # Build
+    sdk_version = manifest["target"]["sdk"]
+    if not use_local_sdk:
+        validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build)
+        if not sdk_download_all(sdk_version, platforms_to_build):
+            exit_with_error("Failed to download one or more SDKs")
+    build_all(sdk_version, platforms_to_build, skip_build)  # Environment validation
+    if not skip_build:
+        package_all(platforms_to_build)
+
+def clean_action():
+    if os.path.exists("build"):
+        print(f"Removing build/")
+        shutil.rmtree("build")
+    else:
+        print("Nothing to clean")
+
+def clear_cache_action():
+    if os.path.exists(ttbuild_path):
+        print(f"Removing {ttbuild_path}/")
+        shutil.rmtree(ttbuild_path)
+    else:
+        print("Nothing to clear")
+
+def update_self_action():
+    sdk_json = read_sdk_json()
+    tool_download_url = sdk_json["toolDownloadUrl"]
+    if download_file(tool_download_url, "tactility.py"):
+        print("Updated")
+    else:
+        exit_with_error("Update failed")
+
+def get_device_info(ip):
+    print(f"Getting device info from {ip}")
+    url = get_url(ip, "/info")
+    try:
+        response = requests.get(url)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(response.json())
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def run_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Running {app_id} on {ip}")
+    url = get_url(ip, "/app/run")
+    params = {'id': app_id}
+    try:
+        response = requests.post(url, params=params)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def install_action(ip, platforms):
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            exit_with_error(f"ELF file not built for {platform}")
+    package_path = package_name(platforms)
+    print(f"Installing {package_path} to {ip}")
+    url = get_url(ip, "/app/install")
+    try:
+        # Prepare multipart form data
+        with open(package_path, 'rb') as file:
+            files = {
+                'elf': file
+            }
+            response = requests.put(url, files=files)
+            if response.status_code != 200:
+                print_error("Install failed")
+            else:
+                print(f"{shell_color_green}Installation successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print_error(f"Installation failed: {e}")
+    except IOError as e:
+        print_error(f"File error: {e}")
+
+def uninstall_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Uninstalling {app_id} on {ip}")
+    url = get_url(ip, "/app/uninstall")
+    params = {'id': app_id}
+    try:
+        response = requests.put(url, params=params)
+        if response.status_code != 200:
+            print_error("Uninstall failed")
+        else:
+            print(f"{shell_color_green}Uninstall successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+#region Main
+
+if __name__ == "__main__":
+    print(f"Tactility Build System v{ttbuild_version}")
+    if "--help" in sys.argv:
+        print_help()
+        sys.exit()
+    # Argument validation
+    if len(sys.argv) == 1:
+        print_help()
+        sys.exit()
+    action_arg = sys.argv[1]
+    verbose = "--verbose" in sys.argv
+    skip_build = "--skip-build" in sys.argv
+    use_local_sdk = "--local-sdk" in sys.argv
+    # Environment setup
+    setup_environment()
+    if not os.path.isfile("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    manifest = read_manifest()
+    validate_manifest(manifest)
+    all_platform_targets = manifest["target"]["platforms"].split(",")
+    # Update SDK cache (sdk.json)
+    if should_update_sdk_json() and not update_sdk_json():
+        exit_with_error("Failed to retrieve SDK info")
+    # Actions
+    if action_arg == "build":
+        if len(sys.argv) < 2:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        if len(sys.argv) > 2:
+            platform = sys.argv[2]
+        build_action(manifest, platform)
+    elif action_arg == "clean":
+        clean_action()
+    elif action_arg == "clearcache":
+        clear_cache_action()
+    elif action_arg == "updateself":
+        update_self_action()
+    elif action_arg == "run":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        run_action(manifest, sys.argv[2])
+    elif action_arg == "install":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        install_action(sys.argv[2], platforms_to_install)
+    elif action_arg == "uninstall":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        uninstall_action(manifest, sys.argv[2])
+    elif action_arg == "bir" or action_arg == "brrr":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        build_action(manifest, platform)
+        install_action(sys.argv[2], platforms_to_install)
+        run_action(manifest, sys.argv[2])
+    else:
+        print_help()
+        exit_with_error("Unknown commandline parameter")
+
+#endregion Main

Apps/GraphicsDemo/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.20)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+if (DEFINED ENV{TACTILITY_SDK_PATH})
+    set(TACTILITY_SDK_PATH $ENV{TACTILITY_SDK_PATH})
+else()
+    set(TACTILITY_SDK_PATH "../../release/TactilitySDK")
+    message(WARNING "⚠️ TACTILITY_SDK_PATH environment variable is not set, defaulting to ${TACTILITY_SDK_PATH}")
+endif()
+
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+set(EXTRA_COMPONENT_DIRS ${TACTILITY_SDK_PATH})
+
+project(GraphicsDemo)
+tactility_project(GraphicsDemo)

Apps/GraphicsDemo/main/CMakeLists.txt

@@ -0,0 +1,7 @@
+file(GLOB_RECURSE SOURCE_FILES Source/*.c*)
+
+idf_component_register(
+    SRC_DIRS "Source"
+    INCLUDE_DIRS "Include"
+    REQUIRES TactilitySDK
+)

Apps/GraphicsDemo/main/Include/Application.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "drivers/DisplayDriver.h"
+#include "drivers/TouchDriver.h"
+
+void runApplication(DisplayDriver* display, TouchDriver* touch);

Apps/GraphicsDemo/main/Include/PixelBuffer.h

@@ -0,0 +1,125 @@
+#pragma once
+
+#include <esp_log.h>
+#include "drivers/Colors.h"
+
+#include <cstring>
+#include <tt_hal_display.h>
+
+class PixelBuffer {
+    uint16_t pixelWidth;
+    uint16_t pixelHeight;
+    ColorFormat colorFormat;
+    uint8_t* data;
+
+public:
+
+    PixelBuffer(uint16_t pixelWidth, uint16_t pixelHeight, ColorFormat colorFormat) :
+        pixelWidth(pixelWidth),
+        pixelHeight(pixelHeight),
+        colorFormat(colorFormat)
+    {
+        data = static_cast<uint8_t*>(malloc(pixelWidth * pixelHeight * getPixelSize()));
+        assert(data != nullptr);
+    }
+
+    ~PixelBuffer() {
+        free(data);
+    }
+
+    uint16_t getPixelWidth() const {
+        return pixelWidth;
+    }
+
+    uint16_t getPixelHeight() const {
+        return pixelHeight;
+    }
+
+    ColorFormat getColorFormat() const {
+        return colorFormat;
+    }
+
+    void* getData() const {
+        return data;
+    }
+
+    uint32_t getDataSize() const {
+        return pixelWidth * pixelHeight * getPixelSize();
+    }
+
+    void* getDataAtRow(uint16_t row) const {
+        auto address = reinterpret_cast<uint32_t>(data) + (row * getRowDataSize());
+        return reinterpret_cast<void*>(address);
+    }
+
+    uint16_t getRowDataSize() const {
+        return pixelWidth * getPixelSize();
+    }
+
+    uint8_t getPixelSize() const {
+        switch (colorFormat) {
+            case COLOR_FORMAT_MONOCHROME:
+                return 1;
+            case COLOR_FORMAT_BGR565:
+            case COLOR_FORMAT_BGR565_SWAPPED:
+            case COLOR_FORMAT_RGB565:
+            case COLOR_FORMAT_RGB565_SWAPPED:
+                return 2;
+            case COLOR_FORMAT_RGB888:
+                return 3;
+            default:
+                // TODO: Crash with error
+                return 0;
+        }
+    }
+
+    uint8_t* getPixelAddress(uint16_t x, uint16_t y) const {
+        uint32_t offset = ((y * getPixelWidth()) + x) * getPixelSize();
+        uint32_t address = reinterpret_cast<uint32_t>(data) + offset;
+        return reinterpret_cast<uint8_t*>(address);
+    }
+
+    void setPixel(uint16_t x, uint16_t y, uint8_t r, uint8_t g, uint8_t b) const {
+        auto address = getPixelAddress(x, y);
+        switch (colorFormat) {
+            case COLOR_FORMAT_MONOCHROME:
+                *address = (uint8_t)((uint16_t)r + (uint16_t)g + (uint16_t)b / 3);
+                break;
+            case COLOR_FORMAT_BGR565:
+                Colors::rgb888ToBgr565(r, g, b, reinterpret_cast<uint16_t*>(address));
+                break;
+            case COLOR_FORMAT_BGR565_SWAPPED: {
+                // TODO: Make proper conversion function
+                Colors::rgb888ToBgr565(r, g, b, reinterpret_cast<uint16_t*>(address));
+                uint8_t temp = *address;
+                *address = *(address + 1);
+                *(address + 1) = temp;
+                break;
+            }
+            case COLOR_FORMAT_RGB565: {
+                Colors::rgb888ToRgb565(r, g, b, reinterpret_cast<uint16_t*>(address));
+                break;
+            }
+            case COLOR_FORMAT_RGB565_SWAPPED: {
+                // TODO: Make proper conversion function
+                Colors::rgb888ToRgb565(r, g, b, reinterpret_cast<uint16_t*>(address));
+                uint8_t temp = *address;
+                *address = *(address + 1);
+                *(address + 1) = temp;
+                break;
+            }
+            case COLOR_FORMAT_RGB888: {
+                uint8_t pixel[3] = { r, g, b };
+                memcpy(address, pixel, 3);
+                break;
+            }
+            default:
+                // NO-OP
+                break;
+        }
+    }
+
+    void clear(int value = 0) const {
+        memset(data, value, getDataSize());
+    }
+};

Apps/GraphicsDemo/main/Include/drivers/Colors.h

@@ -0,0 +1,35 @@
+#pragma once
+
+class Colors {
+
+public:
+
+    static void rgb888ToRgb565(uint8_t red, uint8_t green, uint8_t blue, uint16_t* rgb565) {
+        uint16_t _rgb565 = (red >> 3);
+        _rgb565 = (_rgb565 << 6) | (green >> 2);
+        _rgb565 = (_rgb565 << 5) | (blue >> 3);
+        *rgb565 = _rgb565;
+    }
+
+    static void rgb888ToBgr565(uint8_t red, uint8_t green, uint8_t blue, uint16_t* bgr565) {
+        uint16_t _bgr565 = (blue >> 3);
+        _bgr565 = (_bgr565 << 6) | (green >> 2);
+        _bgr565 = (_bgr565 << 5) | (red >> 3);
+        *bgr565 = _bgr565;
+    }
+
+    static void rgb565ToRgb888(uint16_t rgb565, uint32_t* rgb888) {
+        uint32_t _rgb565 = rgb565;
+        uint8_t b = (_rgb565 >> 8) & 0xF8;
+        uint8_t g = (_rgb565 >> 3) & 0xFC;
+        uint8_t r = (_rgb565 << 3) & 0xF8;
+
+        uint8_t* r8p = reinterpret_cast<uint8_t*>(rgb888);
+        uint8_t* g8p = r8p + 1;
+        uint8_t* b8p = r8p + 2;
+
+        *r8p = r | ((r >> 3) & 0x7);
+        *g8p = g | ((g >> 2) & 0x3);
+        *b8p = b | ((b >> 3) & 0x7);
+    }
+};

Apps/GraphicsDemo/main/Include/drivers/DisplayDriver.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <cassert>
+#include <tt_hal_display.h>
+
+/**
+ * Wrapper for tt_hal_display_driver_*
+ */
+class DisplayDriver {
+
+    DisplayDriverHandle handle = nullptr;
+
+public:
+
+    explicit DisplayDriver(DeviceId id) {
+        assert(tt_hal_display_driver_supported(id));
+        handle = tt_hal_display_driver_alloc(id);
+        assert(handle != nullptr);
+    }
+
+    ~DisplayDriver() {
+        tt_hal_display_driver_free(handle);
+    }
+
+    bool lock(TickType timeout = TT_MAX_TICKS) const {
+        return tt_hal_display_driver_lock(handle, timeout);
+    }
+
+    void unlock() const {
+        tt_hal_display_driver_unlock(handle);
+    }
+
+    uint16_t getWidth() const {
+        return tt_hal_display_driver_get_pixel_width(handle);
+    }
+
+    uint16_t getHeight() const {
+        return tt_hal_display_driver_get_pixel_height(handle);
+    }
+
+    ColorFormat getColorFormat() const {
+        return tt_hal_display_driver_get_colorformat(handle);
+    }
+
+    void drawBitmap(int xStart, int yStart, int xEnd, int yEnd, const void* pixelData) const {
+        tt_hal_display_driver_draw_bitmap(handle, xStart, yStart, xEnd, yEnd, pixelData);
+    }
+};

Apps/GraphicsDemo/main/Include/drivers/TouchDriver.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cassert>
+#include <tt_hal_touch.h>
+
+/**
+ * Wrapper for tt_hal_touch_driver_*
+ */
+class TouchDriver {
+
+    TouchDriverHandle handle = nullptr;
+
+public:
+
+    explicit TouchDriver(DeviceId id) {
+        assert(tt_hal_touch_driver_supported(id));
+        handle = tt_hal_touch_driver_alloc(id);
+        assert(handle != nullptr);
+    }
+
+    ~TouchDriver() {
+        tt_hal_touch_driver_free(handle);
+    }
+
+    bool getTouchedPoints(uint16_t* x, uint16_t* y, uint16_t* strength, uint8_t* count, uint8_t maxCount) const {
+        return tt_hal_touch_driver_get_touched_points(handle, x, y, strength, count, maxCount);
+    }
+};

Apps/GraphicsDemo/main/Source/Application.cpp

@@ -0,0 +1,72 @@
+#include "Application.h"
+#include "PixelBuffer.h"
+#include "esp_log.h"
+
+#include <tt_kernel.h>
+
+constexpr auto TAG = "Application";
+
+static bool isTouched(TouchDriver* touch) {
+    uint16_t x, y, strength;
+    uint8_t pointCount = 0;
+    return touch->getTouchedPoints(&x, &y, &strength, &pointCount, 1);
+}
+
+void createRgbRow(PixelBuffer& buffer) {
+    uint8_t offset = buffer.getPixelWidth() / 3;
+    for (int i = 0; i < buffer.getPixelWidth(); ++i) {
+        if (i < offset) {
+            buffer.setPixel(i, 0, 255, 0, 0);
+        } else if (i < offset * 2) {
+            buffer.setPixel(i, 0, 0, 255, 0);
+        } else {
+            buffer.setPixel(i, 0, 0, 0, 255);
+        }
+    }
+}
+
+void createRgbFadingRow(PixelBuffer& buffer) {
+    uint8_t stroke = buffer.getPixelWidth() / 3;
+    for (int i = 0; i < buffer.getPixelWidth(); ++i) {
+        if (i < stroke) {
+            auto color = i * 255 / stroke;
+            buffer.setPixel(i, 0, color, 0, 0);
+        } else if (i < stroke * 2) {
+            auto color = (i - stroke) * 255 / stroke;
+            buffer.setPixel(i, 0, 0, color, 0);
+        } else {
+            auto color = (i - (2*stroke)) * 255 / stroke;
+            buffer.setPixel(i, 0, 0, 0, color);
+        }
+    }
+}
+
+void runApplication(DisplayDriver* display, TouchDriver* touch) {
+    // Single row buffers
+    PixelBuffer line_clear_buffer(display->getWidth(), 1, display->getColorFormat());
+    line_clear_buffer.clear();
+    PixelBuffer line_buffer(display->getWidth(), 1, display->getColorFormat());
+    line_buffer.clear();
+
+    do {
+        // Draw row by row
+        // This is placed in a loop to test the SPI locking mechanismss
+        for (int i = 0; i < display->getHeight(); i++) {
+
+            if (i == 0) {
+                createRgbRow(line_buffer);
+            } else if (i == display->getHeight() / 2) {
+                createRgbFadingRow(line_buffer);
+            }
+
+            display->lock();
+            display->drawBitmap(0, i, display->getWidth(), i + 1, line_buffer.getData());
+            display->unlock();
+        }
+
+        // Give other tasks space to breathe
+        // SPI displays would otherwise time out SPI SD card access
+        tt_kernel_delay_ticks(1);
+    } while (!isTouched(touch));
+}
+

Apps/GraphicsDemo/main/Source/Main.cpp

@@ -0,0 +1,103 @@
+#include "Application.h"
+#include "drivers/DisplayDriver.h"
+#include "drivers/TouchDriver.h"
+
+#include <esp_log.h>
+
+#include <tt_app.h>
+#include <tt_app_alertdialog.h>
+#include <tt_lvgl.h>
+
+constexpr auto TAG = "Main";
+
+/** Find a DisplayDevice that supports the DisplayDriver interface */
+static bool findUsableDisplay(DeviceId& deviceId) {
+    uint16_t display_count = 0;
+    if (!tt_hal_device_find(DEVICE_TYPE_DISPLAY, &deviceId, &display_count, 1)) {
+        ESP_LOGE(TAG, "No display device found");
+        return false;
+    }
+
+    if (!tt_hal_display_driver_supported(deviceId)) {
+        ESP_LOGE(TAG, "Display doesn't support driver mode");
+        return false;
+    }
+
+    return true;
+}
+
+/** Find a TouchDevice that supports the TouchDriver interface */
+static bool findUsableTouch(DeviceId& deviceId) {
+    uint16_t touch_count = 0;
+    if (!tt_hal_device_find(DEVICE_TYPE_TOUCH, &deviceId, &touch_count, 1)) {
+        ESP_LOGE(TAG, "No touch device found");
+        return false;
+    }
+
+    if (!tt_hal_touch_driver_supported(deviceId)) {
+        ESP_LOGE(TAG, "Touch doesn't support driver mode");
+        return false;
+    }
+
+    return true;
+}
+
+static void onCreate(AppHandle appHandle, void* data) {
+    DeviceId display_id;
+    if (!findUsableDisplay(display_id)) {
+        tt_app_stop();
+        tt_app_alertdialog_start("Error", "The display doesn't support the required features.", nullptr, 0);
+        return;
+    }
+
+    DeviceId touch_id;
+    if (!findUsableTouch(touch_id)) {
+        tt_app_stop();
+        tt_app_alertdialog_start("Error", "The touch driver doesn't support the required features.", nullptr, 0);
+        return;
+    }
+
+    // Stop LVGL first (because it's currently using the drivers we want to use)
+    tt_lvgl_stop();
+
+    ESP_LOGI(TAG, "Creating display driver");
+    auto display = new DisplayDriver(display_id);
+
+    ESP_LOGI(TAG, "Creating touch driver");
+    auto touch = new TouchDriver(touch_id);
+
+    // Run the main logic
+    ESP_LOGI(TAG, "Running application");
+    runApplication(display, touch);
+
+    ESP_LOGI(TAG, "Cleanup display driver");
+    delete display;
+
+    ESP_LOGI(TAG, "Cleanup touch driver");
+    delete touch;
+
+    ESP_LOGI(TAG, "Stopping application");
+    tt_app_stop();
+}
+
+static void onDestroy(AppHandle appHandle, void* data) {
+    // Restart LVGL to resume rendering of regular apps
+    if (!tt_lvgl_is_started()) {
+        ESP_LOGI(TAG, "Restarting LVGL");
+        tt_lvgl_start();
+    }
+}
+
+ExternalAppManifest manifest = {
+    .onCreate = onCreate,
+    .onDestroy = onDestroy
+};
+
+extern "C" {
+
+int main(int argc, char* argv[]) {
+    tt_app_register(&manifest);
+    return 0;
+}
+
+}

Apps/GraphicsDemo/manifest.properties

@@ -0,0 +1,10 @@
+[manifest]
+version=0.1
+[target]
+sdk=0.6.0-SNAPSHOT1
+platforms=esp32,esp32s3
+[app]
+id=one.tactility.graphicsdemo
+versionName=0.1.0
+versionCode=1
+name=Graphics Demo

Apps/GraphicsDemo/tactility.py

@@ -0,0 +1,630 @@
+import configparser
+import json
+import os
+import re
+import shutil
+import sys
+import subprocess
+import time
+import urllib.request
+import zipfile
+import requests
+import tarfile
+import shutil
+import configparser
+
+ttbuild_path = ".tactility"
+ttbuild_version = "2.2.0"
+ttbuild_cdn = "https://cdn.tactility.one"
+ttbuild_sdk_json_validity = 3600  # seconds
+ttport = 6666
+verbose = False
+use_local_sdk = False
+valid_platforms = ["esp32", "esp32s3"]
+
+spinner_pattern = [
+    "⠋",
+    "⠙",
+    "⠹",
+    "⠸",
+    "⠼",
+    "⠴",
+    "⠦",
+    "⠧",
+    "⠇",
+    "⠏"
+]
+
+if sys.platform == "win32":
+    shell_color_red = ""
+    shell_color_orange = ""
+    shell_color_green = ""
+    shell_color_purple = ""
+    shell_color_cyan = ""
+    shell_color_reset = ""
+else:
+    shell_color_red = "\033[91m"
+    shell_color_orange = "\033[93m"
+    shell_color_green = "\033[32m"
+    shell_color_purple = "\033[35m"
+    shell_color_cyan = "\033[36m"
+    shell_color_reset = "\033[m"
+
+def print_help():
+    print("Usage: python tactility.py [action] [options]")
+    print("")
+    print("Actions:")
+    print("  build [esp32,esp32s3]          Build the app. Optionally specify a platform.")
+    print("    esp32:         ESP32")
+    print("    esp32s3:       ESP32 S3")
+    print("  clean                          Clean the build folders")
+    print("  clearcache                     Clear the SDK cache")
+    print("  updateself                     Update this tool")
+    print("  run [ip]                       Run the application")
+    print("  install [ip]                   Install the application")
+    print("  uninstall [ip]                 Uninstall the application")
+    print("  bir [ip] [esp32,esp32s3]       Build, install then run. Optionally specify a platform.")
+    print("  brrr [ip] [esp32,esp32s3]      Functionally the same as \"bir\", but \"app goes brrr\" meme variant.")
+    print("")
+    print("Options:")
+    print("  --help                         Show this commandline info")
+    print("  --local-sdk                    Use SDK specified by environment variable TACTILITY_SDK_PATH")
+    print("  --skip-build                   Run everything except the idf.py/CMake commands")
+    print("  --verbose                      Show extra console output")
+
+# region Core
+
+def download_file(url, filepath):
+    global verbose
+    if verbose:
+        print(f"Downloading from {url} to {filepath}")
+    request = urllib.request.Request(
+        url,
+        data=None,
+        headers={
+            "User-Agent": f"Tactility Build Tool {ttbuild_version}"
+        }
+    )
+    try:
+        response = urllib.request.urlopen(request)
+        file = open(filepath, mode="wb")
+        file.write(response.read())
+        file.close()
+        return True
+    except OSError as error:
+        if verbose:
+            print_error(f"Failed to fetch URL {url}\n{error}")
+        return False
+
+def print_warning(message):
+    print(f"{shell_color_orange}WARNING: {message}{shell_color_reset}")
+
+def print_error(message):
+    print(f"{shell_color_red}ERROR: {message}{shell_color_reset}")
+
+def exit_with_error(message):
+    print_error(message)
+    sys.exit(1)
+
+def get_url(ip, path):
+    return f"http://{ip}:{ttport}{path}"
+
+def read_properties_file(path):
+    config = configparser.RawConfigParser()
+    config.read(path)
+    return config
+
+#endregion Core
+
+#region SDK helpers
+
+def read_sdk_json():
+    json_file_path = os.path.join(ttbuild_path, "sdk.json")
+    json_file = open(json_file_path)
+    return json.load(json_file)
+
+def get_sdk_dir(version, platform):
+    global use_local_sdk
+    if use_local_sdk:
+        return os.environ.get("TACTILITY_SDK_PATH")
+    else:
+        global ttbuild_cdn
+        return os.path.join(ttbuild_path, f"{version}-{platform}", "TactilitySDK")
+
+def get_sdk_root_dir(version, platform):
+    global ttbuild_cdn
+    return os.path.join(ttbuild_path, f"{version}-{platform}")
+
+def get_sdk_url(version, platform):
+    global ttbuild_cdn
+    return f"{ttbuild_cdn}/TactilitySDK-{version}-{platform}.zip"
+
+def sdk_exists(version, platform):
+    sdk_dir = get_sdk_dir(version, platform)
+    return os.path.isdir(sdk_dir)
+
+def should_update_sdk_json():
+    global ttbuild_cdn
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    if os.path.exists(json_filepath):
+        json_modification_time = os.path.getmtime(json_filepath)
+        now = time.time()
+        global ttbuild_sdk_json_validity
+        minimum_seconds_difference = ttbuild_sdk_json_validity
+        return (now - json_modification_time) > minimum_seconds_difference
+    else:
+        return True
+
+def update_sdk_json():
+    global ttbuild_cdn, ttbuild_path
+    json_url = f"{ttbuild_cdn}/sdk.json"
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    return download_file(json_url, json_filepath)
+
+def should_fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        if not os.path.exists(os.path.join(ttbuild_path, sdkconfig_filename)):
+            return True
+    return False
+
+def fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        target_path = os.path.join(ttbuild_path, sdkconfig_filename)
+        if not download_file(f"{ttbuild_cdn}/{sdkconfig_filename}", target_path):
+            exit_with_error(f"Failed to download sdkconfig file for {platform}")
+
+#endregion SDK helpers
+
+#region Validation
+
+def validate_environment():
+    if os.environ.get("IDF_PATH") is None:
+        exit_with_error("Cannot find the Espressif IDF SDK. Ensure it is installed and that it is activated via $PATH_TO_IDF_SDK/export.sh")
+    if not os.path.exists("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    if use_local_sdk == False and os.environ.get("TACTILITY_SDK_PATH") is not None:
+        print_warning("TACTILITY_SDK_PATH is set, but will be ignored by this command.")
+        print_warning("If you want to use it, use the 'build local' parameters.")
+    elif use_local_sdk == True and os.environ.get("TACTILITY_SDK_PATH") is None:
+        exit_with_error("local build was requested, but TACTILITY_SDK_PATH environment variable is not set.")
+
+def validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build):
+    version_map = sdk_json["versions"]
+    if not sdk_version in version_map:
+        exit_with_error(f"Version not found: {sdk_version}")
+    version_data = version_map[sdk_version]
+    available_platforms = version_data["platforms"]
+    for desired_platform in platforms_to_build:
+        if not desired_platform in available_platforms:
+            exit_with_error(f"Platform {desired_platform} is not available. Available ones: {available_platforms}")
+
+def validate_self(sdk_json):
+    if not "toolVersion" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolVersion not found)")
+    if not "toolCompatibility" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolCompatibility not found)")
+    if not "toolDownloadUrl" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolDownloadUrl not found)")
+    tool_version = sdk_json["toolVersion"]
+    tool_compatibility = sdk_json["toolCompatibility"]
+    if tool_version != ttbuild_version:
+        print_warning(f"New version available: {tool_version} (currently using {ttbuild_version})")
+        print_warning(f"Run 'tactility.py updateself' to update.")
+    if re.search(tool_compatibility, ttbuild_version) is None:
+        print_error("The tool is not compatible anymore.")
+        print_error("Run 'tactility.py updateself' to update.")
+        sys.exit(1)
+
+#endregion Validation
+
+#region Manifest
+
+def read_manifest():
+    return read_properties_file("manifest.properties")
+
+def validate_manifest(manifest):
+    # [manifest]
+    if not "manifest" in manifest:
+        exit_with_error("Invalid manifest format: [manifest] not found")
+    if not "version" in manifest["manifest"]:
+        exit_with_error("Invalid manifest format: [manifest] version not found")
+    # [target]
+    if not "target" in manifest:
+        exit_with_error("Invalid manifest format: [target] not found")
+    if not "sdk" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] sdk not found")
+    if not "platforms" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] platforms not found")
+    # [app]
+    if not "app" in manifest:
+        exit_with_error("Invalid manifest format: [app] not found")
+    if not "id" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] id not found")
+    if not "versionName" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionName not found")
+    if not "versionCode" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionCode not found")
+    if not "name" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] name not found")
+
+def is_valid_manifest_platform(manifest, platform):
+    manifest_platforms = manifest["target"]["platforms"].split(",")
+    return platform in manifest_platforms
+
+def validate_manifest_platform(manifest, platform):
+    if not is_valid_manifest_platform(manifest, platform):
+        exit_with_error(f"Platform {platform} is not available in the manifest.")
+
+def get_manifest_target_platforms(manifest, requested_platform):
+    if requested_platform == "" or requested_platform is None:
+        return manifest["target"]["platforms"].split(",")
+    else:
+        validate_manifest_platform(manifest, requested_platform)
+        return [requested_platform]
+
+#endregion Manifest
+
+#region SDK download
+
+def sdk_download(version, platform):
+    sdk_root_dir = get_sdk_root_dir(version, platform)
+    os.makedirs(sdk_root_dir, exist_ok=True)
+    sdk_url = get_sdk_url(version, platform)
+    filepath = os.path.join(sdk_root_dir, f"{version}-{platform}.zip")
+    print(f"Downloading SDK version {version} for {platform}")
+    if download_file(sdk_url, filepath):
+        with zipfile.ZipFile(filepath, "r") as zip_ref:
+            zip_ref.extractall(os.path.join(sdk_root_dir, "TactilitySDK"))
+        return True
+    else:
+        return False
+
+def sdk_download_all(version, platforms):
+    for platform in platforms:
+        if not sdk_exists(version, platform):
+            if not sdk_download(version, platform):
+                return False
+        else:
+            if verbose:
+                print(f"Using cached download for SDK version {version} and platform {platform}")
+    return True
+
+#endregion SDK download
+
+#region Building
+
+def get_cmake_path(platform):
+    return os.path.join("build", f"cmake-build-{platform}")
+
+def find_elf_file(platform):
+    cmake_dir = get_cmake_path(platform)
+    if os.path.exists(cmake_dir):
+        for file in os.listdir(cmake_dir):
+            if file.endswith(".app.elf"):
+                return os.path.join(cmake_dir, file)
+    return None
+
+def build_all(version, platforms, skip_build):
+    for platform in platforms:
+        # First build command must be "idf.py build", otherwise it fails to execute "idf.py elf"
+        # We check if the ELF file exists and run the correct command
+        # This can lead to code caching issues, so sometimes a clean build is required
+        if find_elf_file(platform) is None:
+            if not build_first(version, platform, skip_build):
+                break
+        else:
+            if not build_consecutively(version, platform, skip_build):
+                break
+
+def wait_for_build(process, platform):
+    buffer = []
+    os.set_blocking(process.stdout.fileno(), False)
+    while process.poll() is None:
+        for i in spinner_pattern:
+            time.sleep(0.1)
+            progress_text = f"Building for {platform} {shell_color_cyan}" + str(i) + shell_color_reset
+            sys.stdout.write(progress_text + "\r")
+            while True:
+                line = process.stdout.readline()
+                decoded_line = line.decode("UTF-8")
+                if decoded_line != "":
+                    buffer.append(decoded_line)
+                else:
+                    break
+    return buffer
+
+# The first build must call "idf.py build" and consecutive builds must call "idf.py elf" as it finishes faster.
+# The problem is that the "idf.py build" always results in an error, even though the elf file is created.
+# The solution is to suppress the error if we find that the elf file was created.
+def build_first(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    elf_path = find_elf_file(platform)
+    # Remove previous elf file: re-creation of the file is used to measure if the build succeeded,
+    # as the actual build job will always fail due to technical issues with the elf cmake script
+    if elf_path is not None:
+        os.remove(elf_path)
+    if skip_build:
+        return True
+    print("Building first build")
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "build"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        # The return code is never expected to be 0 due to a bug in the elf cmake script, but we keep it just in case
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            if find_elf_file(platform) is None:
+                for line in build_output:
+                    print(line, end="")
+                print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+                return False
+            else:
+                print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+                return True
+
+def build_consecutively(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    if skip_build:
+        return True
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "elf"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            for line in build_output:
+                print(line, end="")
+            print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+            return False
+
+#endregion Building
+
+#region Packaging
+
+def package_intermediate_manifest(target_path):
+    if not os.path.isfile("manifest.properties"):
+        print_error("manifest.properties not found")
+        return
+    shutil.copy("manifest.properties", os.path.join(target_path, "manifest.properties"))
+
+def package_intermediate_binaries(target_path, platforms):
+    elf_dir = os.path.join(target_path, "elf")
+    os.makedirs(elf_dir, exist_ok=True)
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            print_error(f"ELF file not found at {elf_path}")
+            return
+        shutil.copy(elf_path, os.path.join(elf_dir, f"{platform}.elf"))
+
+def package_intermediate_assets(target_path):
+    if os.path.isdir("assets"):
+        shutil.copytree("assets", os.path.join(target_path, "assets"), dirs_exist_ok=True)
+
+def package_intermediate(platforms):
+    target_path = os.path.join("build", "package-intermediate")
+    if os.path.isdir(target_path):
+        shutil.rmtree(target_path)
+    os.makedirs(target_path, exist_ok=True)
+    package_intermediate_manifest(target_path)
+    package_intermediate_binaries(target_path, platforms)
+    package_intermediate_assets(target_path)
+
+def package_name(platforms):
+    elf_path = find_elf_file(platforms[0])
+    elf_base_name = os.path.basename(elf_path).removesuffix(".app.elf")
+    return os.path.join("build", f"{elf_base_name}.app")
+
+def package_all(platforms):
+    print("Packaging app")
+    package_intermediate(platforms)
+    # Create build/something.app
+    tar_path = package_name(platforms)
+    tar = tarfile.open(tar_path, mode="w", format=tarfile.USTAR_FORMAT)
+    tar.add(os.path.join("build", "package-intermediate"), arcname="")
+    tar.close()
+
+#endregion Packaging
+
+def setup_environment():
+    global ttbuild_path
+    os.makedirs(ttbuild_path, exist_ok=True)
+
+def build_action(manifest, platform_arg):
+    # Environment validation
+    validate_environment()
+    platforms_to_build = get_manifest_target_platforms(manifest, platform_arg)
+    if not use_local_sdk:
+        if should_fetch_sdkconfig_files(platforms_to_build):
+            fetch_sdkconfig_files(platforms_to_build)
+        sdk_json = read_sdk_json()
+        validate_self(sdk_json)
+        if not "versions" in sdk_json:
+            exit_with_error("Version data not found in sdk.json")
+    # Build
+    sdk_version = manifest["target"]["sdk"]
+    if not use_local_sdk:
+        validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build)
+        if not sdk_download_all(sdk_version, platforms_to_build):
+            exit_with_error("Failed to download one or more SDKs")
+    build_all(sdk_version, platforms_to_build, skip_build)  # Environment validation
+    if not skip_build:
+        package_all(platforms_to_build)
+
+def clean_action():
+    if os.path.exists("build"):
+        print(f"Removing build/")
+        shutil.rmtree("build")
+    else:
+        print("Nothing to clean")
+
+def clear_cache_action():
+    if os.path.exists(ttbuild_path):
+        print(f"Removing {ttbuild_path}/")
+        shutil.rmtree(ttbuild_path)
+    else:
+        print("Nothing to clear")
+
+def update_self_action():
+    sdk_json = read_sdk_json()
+    tool_download_url = sdk_json["toolDownloadUrl"]
+    if download_file(tool_download_url, "tactility.py"):
+        print("Updated")
+    else:
+        exit_with_error("Update failed")
+
+def get_device_info(ip):
+    print(f"Getting device info from {ip}")
+    url = get_url(ip, "/info")
+    try:
+        response = requests.get(url)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(response.json())
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def run_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Running {app_id} on {ip}")
+    url = get_url(ip, "/app/run")
+    params = {'id': app_id}
+    try:
+        response = requests.post(url, params=params)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def install_action(ip, platforms):
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            exit_with_error(f"ELF file not built for {platform}")
+    package_path = package_name(platforms)
+    print(f"Installing {package_path} to {ip}")
+    url = get_url(ip, "/app/install")
+    try:
+        # Prepare multipart form data
+        with open(package_path, 'rb') as file:
+            files = {
+                'elf': file
+            }
+            response = requests.put(url, files=files)
+            if response.status_code != 200:
+                print_error("Install failed")
+            else:
+                print(f"{shell_color_green}Installation successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print_error(f"Installation failed: {e}")
+    except IOError as e:
+        print_error(f"File error: {e}")
+
+def uninstall_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Uninstalling {app_id} on {ip}")
+    url = get_url(ip, "/app/uninstall")
+    params = {'id': app_id}
+    try:
+        response = requests.put(url, params=params)
+        if response.status_code != 200:
+            print_error("Uninstall failed")
+        else:
+            print(f"{shell_color_green}Uninstall successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+#region Main
+
+if __name__ == "__main__":
+    print(f"Tactility Build System v{ttbuild_version}")
+    if "--help" in sys.argv:
+        print_help()
+        sys.exit()
+    # Argument validation
+    if len(sys.argv) == 1:
+        print_help()
+        sys.exit()
+    action_arg = sys.argv[1]
+    verbose = "--verbose" in sys.argv
+    skip_build = "--skip-build" in sys.argv
+    use_local_sdk = "--local-sdk" in sys.argv
+    # Environment setup
+    setup_environment()
+    if not os.path.isfile("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    manifest = read_manifest()
+    validate_manifest(manifest)
+    all_platform_targets = manifest["target"]["platforms"].split(",")
+    # Update SDK cache (sdk.json)
+    if should_update_sdk_json() and not update_sdk_json():
+        exit_with_error("Failed to retrieve SDK info")
+    # Actions
+    if action_arg == "build":
+        if len(sys.argv) < 2:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        if len(sys.argv) > 2:
+            platform = sys.argv[2]
+        build_action(manifest, platform)
+    elif action_arg == "clean":
+        clean_action()
+    elif action_arg == "clearcache":
+        clear_cache_action()
+    elif action_arg == "updateself":
+        update_self_action()
+    elif action_arg == "run":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        run_action(manifest, sys.argv[2])
+    elif action_arg == "install":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        install_action(sys.argv[2], platforms_to_install)
+    elif action_arg == "uninstall":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        uninstall_action(manifest, sys.argv[2])
+    elif action_arg == "bir" or action_arg == "brrr":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        build_action(manifest, platform)
+        install_action(sys.argv[2], platforms_to_install)
+        run_action(manifest, sys.argv[2])
+    else:
+        print_help()
+        exit_with_error("Unknown commandline parameter")
+
+#endregion Main

Apps/HelloWorld/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.20)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+if (DEFINED ENV{TACTILITY_SDK_PATH})
+    set(TACTILITY_SDK_PATH $ENV{TACTILITY_SDK_PATH})
+else()
+    set(TACTILITY_SDK_PATH "../../release/TactilitySDK")
+    message(WARNING "⚠️ TACTILITY_SDK_PATH environment variable is not set, defaulting to ${TACTILITY_SDK_PATH}")
+endif()
+
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+set(EXTRA_COMPONENT_DIRS ${TACTILITY_SDK_PATH})
+
+project(HelloWorld)
+tactility_project(HelloWorld)

Apps/HelloWorld/assets/message.txt

@@ -0,0 +1 @@
+Hello, world!

Apps/HelloWorld/main/CMakeLists.txt

@@ -0,0 +1,6 @@
+file(GLOB_RECURSE SOURCE_FILES Source/*.c)
+
+idf_component_register(
+    SRCS ${SOURCE_FILES}
+    REQUIRES TactilitySDK
+)

Apps/HelloWorld/main/Source/main.c

@@ -0,0 +1,24 @@
+#include <tt_app_manifest.h>
+#include <tt_lvgl_toolbar.h>
+
+/**
+ * Note: LVGL and Tactility methods need to be exposed manually from TactilityC/Source/tt_init.cpp
+ * Only C is supported for now (C++ symbols fail to link)
+ */
+static void onShow(AppHandle app, void* data, lv_obj_t* parent) {
+    lv_obj_t* toolbar = tt_lvgl_toolbar_create_for_app(parent, app);
+    lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
+
+    lv_obj_t* label = lv_label_create(parent);
+    lv_label_set_text(label, "Hello, world!");
+    lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
+}
+
+ExternalAppManifest manifest = {
+    .onShow = onShow
+};
+
+int main(int argc, char* argv[]) {
+    tt_app_register(&manifest);
+    return 0;
+}

Apps/HelloWorld/manifest.properties

@@ -0,0 +1,10 @@
+[manifest]
+version=0.1
+[target]
+sdk=0.6.0-SNAPSHOT1
+platforms=esp32,esp32s3
+[app]
+id=one.tactility.helloworld
+versionName=0.1.0
+versionCode=1
+name=Hello World

Apps/HelloWorld/tactility.py

@@ -0,0 +1,630 @@
+import configparser
+import json
+import os
+import re
+import shutil
+import sys
+import subprocess
+import time
+import urllib.request
+import zipfile
+import requests
+import tarfile
+import shutil
+import configparser
+
+ttbuild_path = ".tactility"
+ttbuild_version = "2.2.0"
+ttbuild_cdn = "https://cdn.tactility.one"
+ttbuild_sdk_json_validity = 3600  # seconds
+ttport = 6666
+verbose = False
+use_local_sdk = False
+valid_platforms = ["esp32", "esp32s3"]
+
+spinner_pattern = [
+    "⠋",
+    "⠙",
+    "⠹",
+    "⠸",
+    "⠼",
+    "⠴",
+    "⠦",
+    "⠧",
+    "⠇",
+    "⠏"
+]
+
+if sys.platform == "win32":
+    shell_color_red = ""
+    shell_color_orange = ""
+    shell_color_green = ""
+    shell_color_purple = ""
+    shell_color_cyan = ""
+    shell_color_reset = ""
+else:
+    shell_color_red = "\033[91m"
+    shell_color_orange = "\033[93m"
+    shell_color_green = "\033[32m"
+    shell_color_purple = "\033[35m"
+    shell_color_cyan = "\033[36m"
+    shell_color_reset = "\033[m"
+
+def print_help():
+    print("Usage: python tactility.py [action] [options]")
+    print("")
+    print("Actions:")
+    print("  build [esp32,esp32s3]          Build the app. Optionally specify a platform.")
+    print("    esp32:         ESP32")
+    print("    esp32s3:       ESP32 S3")
+    print("  clean                          Clean the build folders")
+    print("  clearcache                     Clear the SDK cache")
+    print("  updateself                     Update this tool")
+    print("  run [ip]                       Run the application")
+    print("  install [ip]                   Install the application")
+    print("  uninstall [ip]                 Uninstall the application")
+    print("  bir [ip] [esp32,esp32s3]       Build, install then run. Optionally specify a platform.")
+    print("  brrr [ip] [esp32,esp32s3]      Functionally the same as \"bir\", but \"app goes brrr\" meme variant.")
+    print("")
+    print("Options:")
+    print("  --help                         Show this commandline info")
+    print("  --local-sdk                    Use SDK specified by environment variable TACTILITY_SDK_PATH")
+    print("  --skip-build                   Run everything except the idf.py/CMake commands")
+    print("  --verbose                      Show extra console output")
+
+# region Core
+
+def download_file(url, filepath):
+    global verbose
+    if verbose:
+        print(f"Downloading from {url} to {filepath}")
+    request = urllib.request.Request(
+        url,
+        data=None,
+        headers={
+            "User-Agent": f"Tactility Build Tool {ttbuild_version}"
+        }
+    )
+    try:
+        response = urllib.request.urlopen(request)
+        file = open(filepath, mode="wb")
+        file.write(response.read())
+        file.close()
+        return True
+    except OSError as error:
+        if verbose:
+            print_error(f"Failed to fetch URL {url}\n{error}")
+        return False
+
+def print_warning(message):
+    print(f"{shell_color_orange}WARNING: {message}{shell_color_reset}")
+
+def print_error(message):
+    print(f"{shell_color_red}ERROR: {message}{shell_color_reset}")
+
+def exit_with_error(message):
+    print_error(message)
+    sys.exit(1)
+
+def get_url(ip, path):
+    return f"http://{ip}:{ttport}{path}"
+
+def read_properties_file(path):
+    config = configparser.RawConfigParser()
+    config.read(path)
+    return config
+
+#endregion Core
+
+#region SDK helpers
+
+def read_sdk_json():
+    json_file_path = os.path.join(ttbuild_path, "sdk.json")
+    json_file = open(json_file_path)
+    return json.load(json_file)
+
+def get_sdk_dir(version, platform):
+    global use_local_sdk
+    if use_local_sdk:
+        return os.environ.get("TACTILITY_SDK_PATH")
+    else:
+        global ttbuild_cdn
+        return os.path.join(ttbuild_path, f"{version}-{platform}", "TactilitySDK")
+
+def get_sdk_root_dir(version, platform):
+    global ttbuild_cdn
+    return os.path.join(ttbuild_path, f"{version}-{platform}")
+
+def get_sdk_url(version, platform):
+    global ttbuild_cdn
+    return f"{ttbuild_cdn}/TactilitySDK-{version}-{platform}.zip"
+
+def sdk_exists(version, platform):
+    sdk_dir = get_sdk_dir(version, platform)
+    return os.path.isdir(sdk_dir)
+
+def should_update_sdk_json():
+    global ttbuild_cdn
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    if os.path.exists(json_filepath):
+        json_modification_time = os.path.getmtime(json_filepath)
+        now = time.time()
+        global ttbuild_sdk_json_validity
+        minimum_seconds_difference = ttbuild_sdk_json_validity
+        return (now - json_modification_time) > minimum_seconds_difference
+    else:
+        return True
+
+def update_sdk_json():
+    global ttbuild_cdn, ttbuild_path
+    json_url = f"{ttbuild_cdn}/sdk.json"
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    return download_file(json_url, json_filepath)
+
+def should_fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        if not os.path.exists(os.path.join(ttbuild_path, sdkconfig_filename)):
+            return True
+    return False
+
+def fetch_sdkconfig_files(platform_targets):
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        target_path = os.path.join(ttbuild_path, sdkconfig_filename)
+        if not download_file(f"{ttbuild_cdn}/{sdkconfig_filename}", target_path):
+            exit_with_error(f"Failed to download sdkconfig file for {platform}")
+
+#endregion SDK helpers
+
+#region Validation
+
+def validate_environment():
+    if os.environ.get("IDF_PATH") is None:
+        exit_with_error("Cannot find the Espressif IDF SDK. Ensure it is installed and that it is activated via $PATH_TO_IDF_SDK/export.sh")
+    if not os.path.exists("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    if use_local_sdk == False and os.environ.get("TACTILITY_SDK_PATH") is not None:
+        print_warning("TACTILITY_SDK_PATH is set, but will be ignored by this command.")
+        print_warning("If you want to use it, use the 'build local' parameters.")
+    elif use_local_sdk == True and os.environ.get("TACTILITY_SDK_PATH") is None:
+        exit_with_error("local build was requested, but TACTILITY_SDK_PATH environment variable is not set.")
+
+def validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build):
+    version_map = sdk_json["versions"]
+    if not sdk_version in version_map:
+        exit_with_error(f"Version not found: {sdk_version}")
+    version_data = version_map[sdk_version]
+    available_platforms = version_data["platforms"]
+    for desired_platform in platforms_to_build:
+        if not desired_platform in available_platforms:
+            exit_with_error(f"Platform {desired_platform} is not available. Available ones: {available_platforms}")
+
+def validate_self(sdk_json):
+    if not "toolVersion" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolVersion not found)")
+    if not "toolCompatibility" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolCompatibility not found)")
+    if not "toolDownloadUrl" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolDownloadUrl not found)")
+    tool_version = sdk_json["toolVersion"]
+    tool_compatibility = sdk_json["toolCompatibility"]
+    if tool_version != ttbuild_version:
+        print_warning(f"New version available: {tool_version} (currently using {ttbuild_version})")
+        print_warning(f"Run 'tactility.py updateself' to update.")
+    if re.search(tool_compatibility, ttbuild_version) is None:
+        print_error("The tool is not compatible anymore.")
+        print_error("Run 'tactility.py updateself' to update.")
+        sys.exit(1)
+
+#endregion Validation
+
+#region Manifest
+
+def read_manifest():
+    return read_properties_file("manifest.properties")
+
+def validate_manifest(manifest):
+    # [manifest]
+    if not "manifest" in manifest:
+        exit_with_error("Invalid manifest format: [manifest] not found")
+    if not "version" in manifest["manifest"]:
+        exit_with_error("Invalid manifest format: [manifest] version not found")
+    # [target]
+    if not "target" in manifest:
+        exit_with_error("Invalid manifest format: [target] not found")
+    if not "sdk" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] sdk not found")
+    if not "platforms" in manifest["target"]:
+        exit_with_error("Invalid manifest format: [target] platforms not found")
+    # [app]
+    if not "app" in manifest:
+        exit_with_error("Invalid manifest format: [app] not found")
+    if not "id" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] id not found")
+    if not "versionName" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionName not found")
+    if not "versionCode" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] versionCode not found")
+    if not "name" in manifest["app"]:
+        exit_with_error("Invalid manifest format: [app] name not found")
+
+def is_valid_manifest_platform(manifest, platform):
+    manifest_platforms = manifest["target"]["platforms"].split(",")
+    return platform in manifest_platforms
+
+def validate_manifest_platform(manifest, platform):
+    if not is_valid_manifest_platform(manifest, platform):
+        exit_with_error(f"Platform {platform} is not available in the manifest.")
+
+def get_manifest_target_platforms(manifest, requested_platform):
+    if requested_platform == "" or requested_platform is None:
+        return manifest["target"]["platforms"].split(",")
+    else:
+        validate_manifest_platform(manifest, requested_platform)
+        return [requested_platform]
+
+#endregion Manifest
+
+#region SDK download
+
+def sdk_download(version, platform):
+    sdk_root_dir = get_sdk_root_dir(version, platform)
+    os.makedirs(sdk_root_dir, exist_ok=True)
+    sdk_url = get_sdk_url(version, platform)
+    filepath = os.path.join(sdk_root_dir, f"{version}-{platform}.zip")
+    print(f"Downloading SDK version {version} for {platform}")
+    if download_file(sdk_url, filepath):
+        with zipfile.ZipFile(filepath, "r") as zip_ref:
+            zip_ref.extractall(os.path.join(sdk_root_dir, "TactilitySDK"))
+        return True
+    else:
+        return False
+
+def sdk_download_all(version, platforms):
+    for platform in platforms:
+        if not sdk_exists(version, platform):
+            if not sdk_download(version, platform):
+                return False
+        else:
+            if verbose:
+                print(f"Using cached download for SDK version {version} and platform {platform}")
+    return True
+
+#endregion SDK download
+
+#region Building
+
+def get_cmake_path(platform):
+    return os.path.join("build", f"cmake-build-{platform}")
+
+def find_elf_file(platform):
+    cmake_dir = get_cmake_path(platform)
+    if os.path.exists(cmake_dir):
+        for file in os.listdir(cmake_dir):
+            if file.endswith(".app.elf"):
+                return os.path.join(cmake_dir, file)
+    return None
+
+def build_all(version, platforms, skip_build):
+    for platform in platforms:
+        # First build command must be "idf.py build", otherwise it fails to execute "idf.py elf"
+        # We check if the ELF file exists and run the correct command
+        # This can lead to code caching issues, so sometimes a clean build is required
+        if find_elf_file(platform) is None:
+            if not build_first(version, platform, skip_build):
+                break
+        else:
+            if not build_consecutively(version, platform, skip_build):
+                break
+
+def wait_for_build(process, platform):
+    buffer = []
+    os.set_blocking(process.stdout.fileno(), False)
+    while process.poll() is None:
+        for i in spinner_pattern:
+            time.sleep(0.1)
+            progress_text = f"Building for {platform} {shell_color_cyan}" + str(i) + shell_color_reset
+            sys.stdout.write(progress_text + "\r")
+            while True:
+                line = process.stdout.readline()
+                decoded_line = line.decode("UTF-8")
+                if decoded_line != "":
+                    buffer.append(decoded_line)
+                else:
+                    break
+    return buffer
+
+# The first build must call "idf.py build" and consecutive builds must call "idf.py elf" as it finishes faster.
+# The problem is that the "idf.py build" always results in an error, even though the elf file is created.
+# The solution is to suppress the error if we find that the elf file was created.
+def build_first(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    elf_path = find_elf_file(platform)
+    # Remove previous elf file: re-creation of the file is used to measure if the build succeeded,
+    # as the actual build job will always fail due to technical issues with the elf cmake script
+    if elf_path is not None:
+        os.remove(elf_path)
+    if skip_build:
+        return True
+    print("Building first build")
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "build"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        # The return code is never expected to be 0 due to a bug in the elf cmake script, but we keep it just in case
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            if find_elf_file(platform) is None:
+                for line in build_output:
+                    print(line, end="")
+                print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+                return False
+            else:
+                print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+                return True
+
+def build_consecutively(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    if skip_build:
+        return True
+    cmake_path = get_cmake_path(platform)
+    with subprocess.Popen(["idf.py", "-B", cmake_path, "elf"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            for line in build_output:
+                print(line, end="")
+            print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+            return False
+
+#endregion Building
+
+#region Packaging
+
+def package_intermediate_manifest(target_path):
+    if not os.path.isfile("manifest.properties"):
+        print_error("manifest.properties not found")
+        return
+    shutil.copy("manifest.properties", os.path.join(target_path, "manifest.properties"))
+
+def package_intermediate_binaries(target_path, platforms):
+    elf_dir = os.path.join(target_path, "elf")
+    os.makedirs(elf_dir, exist_ok=True)
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            print_error(f"ELF file not found at {elf_path}")
+            return
+        shutil.copy(elf_path, os.path.join(elf_dir, f"{platform}.elf"))
+
+def package_intermediate_assets(target_path):
+    if os.path.isdir("assets"):
+        shutil.copytree("assets", os.path.join(target_path, "assets"), dirs_exist_ok=True)
+
+def package_intermediate(platforms):
+    target_path = os.path.join("build", "package-intermediate")
+    if os.path.isdir(target_path):
+        shutil.rmtree(target_path)
+    os.makedirs(target_path, exist_ok=True)
+    package_intermediate_manifest(target_path)
+    package_intermediate_binaries(target_path, platforms)
+    package_intermediate_assets(target_path)
+
+def package_name(platforms):
+    elf_path = find_elf_file(platforms[0])
+    elf_base_name = os.path.basename(elf_path).removesuffix(".app.elf")
+    return os.path.join("build", f"{elf_base_name}.app")
+
+def package_all(platforms):
+    print("Packaging app")
+    package_intermediate(platforms)
+    # Create build/something.app
+    tar_path = package_name(platforms)
+    tar = tarfile.open(tar_path, mode="w", format=tarfile.USTAR_FORMAT)
+    tar.add(os.path.join("build", "package-intermediate"), arcname="")
+    tar.close()
+
+#endregion Packaging
+
+def setup_environment():
+    global ttbuild_path
+    os.makedirs(ttbuild_path, exist_ok=True)
+
+def build_action(manifest, platform_arg):
+    # Environment validation
+    validate_environment()
+    platforms_to_build = get_manifest_target_platforms(manifest, platform_arg)
+    if not use_local_sdk:
+        if should_fetch_sdkconfig_files(platforms_to_build):
+            fetch_sdkconfig_files(platforms_to_build)
+        sdk_json = read_sdk_json()
+        validate_self(sdk_json)
+        if not "versions" in sdk_json:
+            exit_with_error("Version data not found in sdk.json")
+    # Build
+    sdk_version = manifest["target"]["sdk"]
+    if not use_local_sdk:
+        validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build)
+        if not sdk_download_all(sdk_version, platforms_to_build):
+            exit_with_error("Failed to download one or more SDKs")
+    build_all(sdk_version, platforms_to_build, skip_build)  # Environment validation
+    if not skip_build:
+        package_all(platforms_to_build)
+
+def clean_action():
+    if os.path.exists("build"):
+        print(f"Removing build/")
+        shutil.rmtree("build")
+    else:
+        print("Nothing to clean")
+
+def clear_cache_action():
+    if os.path.exists(ttbuild_path):
+        print(f"Removing {ttbuild_path}/")
+        shutil.rmtree(ttbuild_path)
+    else:
+        print("Nothing to clear")
+
+def update_self_action():
+    sdk_json = read_sdk_json()
+    tool_download_url = sdk_json["toolDownloadUrl"]
+    if download_file(tool_download_url, "tactility.py"):
+        print("Updated")
+    else:
+        exit_with_error("Update failed")
+
+def get_device_info(ip):
+    print(f"Getting device info from {ip}")
+    url = get_url(ip, "/info")
+    try:
+        response = requests.get(url)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(response.json())
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def run_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Running {app_id} on {ip}")
+    url = get_url(ip, "/app/run")
+    params = {'id': app_id}
+    try:
+        response = requests.post(url, params=params)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def install_action(ip, platforms):
+    for platform in platforms:
+        elf_path = find_elf_file(platform)
+        if elf_path is None:
+            exit_with_error(f"ELF file not built for {platform}")
+    package_path = package_name(platforms)
+    print(f"Installing {package_path} to {ip}")
+    url = get_url(ip, "/app/install")
+    try:
+        # Prepare multipart form data
+        with open(package_path, 'rb') as file:
+            files = {
+                'elf': file
+            }
+            response = requests.put(url, files=files)
+            if response.status_code != 200:
+                print_error("Install failed")
+            else:
+                print(f"{shell_color_green}Installation successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print_error(f"Installation failed: {e}")
+    except IOError as e:
+        print_error(f"File error: {e}")
+
+def uninstall_action(manifest, ip):
+    app_id = manifest["app"]["id"]
+    print(f"Uninstalling {app_id} on {ip}")
+    url = get_url(ip, "/app/uninstall")
+    params = {'id': app_id}
+    try:
+        response = requests.put(url, params=params)
+        if response.status_code != 200:
+            print_error("Uninstall failed")
+        else:
+            print(f"{shell_color_green}Uninstall successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+#region Main
+
+if __name__ == "__main__":
+    print(f"Tactility Build System v{ttbuild_version}")
+    if "--help" in sys.argv:
+        print_help()
+        sys.exit()
+    # Argument validation
+    if len(sys.argv) == 1:
+        print_help()
+        sys.exit()
+    action_arg = sys.argv[1]
+    verbose = "--verbose" in sys.argv
+    skip_build = "--skip-build" in sys.argv
+    use_local_sdk = "--local-sdk" in sys.argv
+    # Environment setup
+    setup_environment()
+    if not os.path.isfile("manifest.properties"):
+        exit_with_error("manifest.properties not found")
+    manifest = read_manifest()
+    validate_manifest(manifest)
+    all_platform_targets = manifest["target"]["platforms"].split(",")
+    # Update SDK cache (sdk.json)
+    if should_update_sdk_json() and not update_sdk_json():
+        exit_with_error("Failed to retrieve SDK info")
+    # Actions
+    if action_arg == "build":
+        if len(sys.argv) < 2:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        if len(sys.argv) > 2:
+            platform = sys.argv[2]
+        build_action(manifest, platform)
+    elif action_arg == "clean":
+        clean_action()
+    elif action_arg == "clearcache":
+        clear_cache_action()
+    elif action_arg == "updateself":
+        update_self_action()
+    elif action_arg == "run":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        run_action(manifest, sys.argv[2])
+    elif action_arg == "install":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        install_action(sys.argv[2], platforms_to_install)
+    elif action_arg == "uninstall":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        uninstall_action(manifest, sys.argv[2])
+    elif action_arg == "bir" or action_arg == "brrr":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        platform = None
+        platforms_to_install = all_platform_targets
+        if len(sys.argv) >= 4:
+            platform = sys.argv[3]
+            platforms_to_install = [platform]
+        build_action(manifest, platform)
+        install_action(sys.argv[2], platforms_to_install)
+        run_action(manifest, sys.argv[2])
+    else:
+        print_help()
+        exit_with_error("Unknown commandline parameter")
+
+#endregion Main

Documentation/license-apps.md

@@ -0,0 +1,636 @@
+# GNU GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright (C) 2007 [Free Software Foundation, Inc.](http://fsf.org/)
+
+Everyone is permitted to copy and distribute verbatim copies of this license
+document, but changing it is not allowed.
+
+## Preamble
+
+The GNU General Public License is a free, copyleft license for software and
+other kinds of works.
+
+The licenses for most software and other practical works are designed to take
+away your freedom to share and change the works. By contrast, the GNU General
+Public License is intended to guarantee your freedom to share and change all
+versions of a program--to make sure it remains free software for all its users.
+We, the Free Software Foundation, use the GNU General Public License for most
+of our software; it applies also to any other work released this way by its
+authors. You can apply it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not price. Our
+General Public Licenses are designed to make sure that you have the freedom to
+distribute copies of free software (and charge for them if you wish), that you
+receive source code or can get it if you want it, that you can change the
+software or use pieces of it in new free programs, and that you know you can do
+these things.
+
+To protect your rights, we need to prevent others from denying you these rights
+or asking you to surrender the rights. Therefore, you have certain
+responsibilities if you distribute copies of the software, or if you modify it:
+responsibilities to respect the freedom of others.
+
+For example, if you distribute copies of such a program, whether gratis or for
+a fee, you must pass on to the recipients the same freedoms that you received.
+You must make sure that they, too, receive or can get the source code. And you
+must show them these terms so they know their rights.
+
+Developers that use the GNU GPL protect your rights with two steps:
+
+  1. assert copyright on the software, and
+  2. offer you this License giving you legal permission to copy, distribute
+     and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains that
+there is no warranty for this free software. For both users' and authors' sake,
+the GPL requires that modified versions be marked as changed, so that their
+problems will not be attributed erroneously to authors of previous versions.
+
+Some devices are designed to deny users access to install or run modified
+versions of the software inside them, although the manufacturer can do so. This
+is fundamentally incompatible with the aim of protecting users' freedom to
+change the software. The systematic pattern of such abuse occurs in the area of
+products for individuals to use, which is precisely where it is most
+unacceptable. Therefore, we have designed this version of the GPL to prohibit
+the practice for those products. If such problems arise substantially in other
+domains, we stand ready to extend this provision to those domains in future
+versions of the GPL, as needed to protect the freedom of users.
+
+Finally, every program is threatened constantly by software patents. States
+should not allow patents to restrict development and use of software on
+general-purpose computers, but in those that do, we wish to avoid the special
+danger that patents applied to a free program could make it effectively
+proprietary. To prevent this, the GPL assures that patents cannot be used to
+render the program non-free.
+
+The precise terms and conditions for copying, distribution and modification
+follow.
+
+## TERMS AND CONDITIONS
+
+### 0. Definitions.
+
+*This License* refers to version 3 of the GNU General Public License.
+
+*Copyright* also means copyright-like laws that apply to other kinds of works,
+such as semiconductor masks.
+
+*The Program* refers to any copyrightable work licensed under this License.
+Each licensee is addressed as *you*. *Licensees* and *recipients* may be
+individuals or organizations.
+
+To *modify* a work means to copy from or adapt all or part of the work in a
+fashion requiring copyright permission, other than the making of an exact copy.
+The resulting work is called a *modified version* of the earlier work or a work
+*based on* the earlier work.
+
+A *covered work* means either the unmodified Program or a work based on the
+Program.
+
+To *propagate* a work means to do anything with it that, without permission,
+would make you directly or secondarily liable for infringement under applicable
+copyright law, except executing it on a computer or modifying a private copy.
+Propagation includes copying, distribution (with or without modification),
+making available to the public, and in some countries other activities as well.
+
+To *convey* a work means any kind of propagation that enables other parties to
+make or receive copies. Mere interaction with a user through a computer
+network, with no transfer of a copy, is not conveying.
+
+An interactive user interface displays *Appropriate Legal Notices* to the
+extent that it includes a convenient and prominently visible feature that
+
+  1. displays an appropriate copyright notice, and
+  2. tells the user that there is no warranty for the work (except to the
+     extent that warranties are provided), that licensees may convey the work
+     under this License, and how to view a copy of this License.
+
+If the interface presents a list of user commands or options, such as a menu, a
+prominent item in the list meets this criterion.
+
+### 1. Source Code.
+
+The *source code* for a work means the preferred form of the work for making
+modifications to it. *Object code* means any non-source form of a work.
+
+A *Standard Interface* means an interface that either is an official standard
+defined by a recognized standards body, or, in the case of interfaces specified
+for a particular programming language, one that is widely used among developers
+working in that language.
+
+The *System Libraries* of an executable work include anything, other than the
+work as a whole, that (a) is included in the normal form of packaging a Major
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+files for the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require, such as
+by intimate data communication or control flow between those subprograms and
+other parts of the work.
+
+The Corresponding Source need not include anything that users can regenerate
+automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same work.
+
+### 2. Basic Permissions.
+
+All rights granted under this License are granted for the term of copyright on
+the Program, and are irrevocable provided the stated conditions are met. This
+License explicitly affirms your unlimited permission to run the unmodified
+Program. The output from running a covered work is covered by this License only
+if the output, given its content, constitutes a covered work. This License
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+copyright law.
+
+You may make, run and propagate covered works that you do not convey, without
+conditions so long as your license otherwise remains in force. You may convey
+covered works to others for the sole purpose of having them make modifications
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+provided that you comply with the terms of this License in conveying all
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+
+Conveying under any other circumstances is permitted solely under the
+conditions stated below. Sublicensing is not allowed; section 10 makes it
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+
+### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+No covered work shall be deemed part of an effective technological measure
+under any applicable law fulfilling obligations under article 11 of the WIPO
+copyright treaty adopted on 20 December 1996, or similar laws prohibiting or
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+
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+work as a means of enforcing, against the work's users, your or third parties'
+legal rights to forbid circumvention of technological measures.
+
+### 4. Conveying Verbatim Copies.
+
+You may convey verbatim copies of the Program's source code as you receive it,
+in any medium, provided that you conspicuously and appropriately publish on
+each copy an appropriate copyright notice; keep intact all notices stating that
+this License and any non-permissive terms added in accord with section 7 apply
+to the code; keep intact all notices of the absence of any warranty; and give
+all recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey, and you may
+offer support or warranty protection for a fee.
+
+### 5. Conveying Modified Source Versions.
+
+You may convey a work based on the Program, or the modifications to produce it
+from the Program, in the form of source code under the terms of section 4,
+provided that you also meet all of these conditions:
+
+  - a) The work must carry prominent notices stating that you modified it, and
+    giving a relevant date.
+  - b) The work must carry prominent notices stating that it is released under
+    this License and any conditions added under section 7. This requirement
+    modifies the requirement in section 4 to *keep intact all notices*.
+  - c) You must license the entire work, as a whole, under this License to
+    anyone who comes into possession of a copy. This License will therefore
+    apply, along with any applicable section 7 additional terms, to the whole
+    of the work, and all its parts, regardless of how they are packaged. This
+    License gives no permission to license the work in any other way, but it
+    does not invalidate such permission if you have separately received it.
+  - d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your work need
+    not make them do so.
+
+A compilation of a covered work with other separate and independent works,
+which are not by their nature extensions of the covered work, and which are not
+combined with it such as to form a larger program, in or on a volume of a
+storage or distribution medium, is called an *aggregate* if the compilation and
+its resulting copyright are not used to limit the access or legal rights of the
+compilation's users beyond what the individual works permit. Inclusion of a
+covered work in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+### 6. Conveying Non-Source Forms.
+
+You may convey a covered work in object code form under the terms of sections 4
+and 5, provided that you also convey the machine-readable Corresponding Source
+under the terms of this License, in one of these ways:
+
+  - a) Convey the object code in, or embodied in, a physical product (including
+    a physical distribution medium), accompanied by the Corresponding Source
+    fixed on a durable physical medium customarily used for software
+    interchange.
+  - b) Convey the object code in, or embodied in, a physical product (including
+    a physical distribution medium), accompanied by a written offer, valid for
+    at least three years and valid for as long as you offer spare parts or
+    customer support for that product model, to give anyone who possesses the
+    object code either
+    1. a copy of the Corresponding Source for all the software in the product
+       that is covered by this License, on a durable physical medium
+       customarily used for software interchange, for a price no more than your
+       reasonable cost of physically performing this conveying of source, or
+    2. access to copy the Corresponding Source from a network server at no
+       charge.
+  - c) Convey individual copies of the object code with a copy of the written
+    offer to provide the Corresponding Source. This alternative is allowed only
+    occasionally and noncommercially, and only if you received the object code
+    with such an offer, in accord with subsection 6b.
+  - d) Convey the object code by offering access from a designated place
+    (gratis or for a charge), and offer equivalent access to the Corresponding
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+    need not require recipients to copy the Corresponding Source along with the
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+    Corresponding Source may be on a different server operated by you or a
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+    maintain clear directions next to the object code saying where to find the
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+    needed to satisfy these requirements.
+  - e) Convey the object code using peer-to-peer transmission, provided you
+    inform other peers where the object code and Corresponding Source of the
+    work are being offered to the general public at no charge under subsection
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+
+A separable portion of the object code, whose source code is excluded from the
+Corresponding Source as a System Library, need not be included in conveying the
+object code work.
+
+A *User Product* is either
+
+  1. a *consumer product*, which means any tangible personal property which is
+     normally used for personal, family, or household purposes, or
+  2. anything designed or sold for incorporation into a dwelling.
+
+In determining whether a product is a consumer product, doubtful cases shall be
+resolved in favor of coverage. For a particular product received by a
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+class of product, regardless of the status of the particular user or of the way
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+the product. A product is a consumer product regardless of whether the product
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+
+*Installation Information* for a User Product means any methods, procedures,
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+modified versions of a covered work in that User Product from a modified
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+that the continued functioning of the modified object code is in no case
+prevented or interfered with solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as part of a
+transaction in which the right of possession and use of the User Product is
+transferred to the recipient in perpetuity or for a fixed term (regardless of
+how the transaction is characterized), the Corresponding Source conveyed under
+this section must be accompanied by the Installation Information. But this
+requirement does not apply if neither you nor any third party retains the
+ability to install modified object code on the User Product (for example, the
+work has been installed in ROM).
+
+The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates for a
+work that has been modified or installed by the recipient, or for the User
+Product in which it has been modified or installed. Access to a network may be
+denied when the modification itself materially and adversely affects the
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+
+Corresponding Source conveyed, and Installation Information provided, in accord
+with this section must be in a format that is publicly documented (and with an
+implementation available to the public in source code form), and must require
+no special password or key for unpacking, reading or copying.
+
+### 7. Additional Terms.
+
+*Additional permissions* are terms that supplement the terms of this License by
+making exceptions from one or more of its conditions. Additional permissions
+that are applicable to the entire Program shall be treated as though they were
+included in this License, to the extent that they are valid under applicable
+law. If additional permissions apply only to part of the Program, that part may
+be used separately under those permissions, but the entire Program remains
+governed by this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option remove any
+additional permissions from that copy, or from any part of it. (Additional
+permissions may be written to require their own removal in certain cases when
+you modify the work.) You may place additional permissions on material, added
+by you to a covered work, for which you have or can give appropriate copyright
+permission.
+
+Notwithstanding any other provision of this License, for material you add to a
+covered work, you may (if authorized by the copyright holders of that material)
+supplement the terms of this License with terms:
+
+  - a) Disclaiming warranty or limiting liability differently from the terms of
+    sections 15 and 16 of this License; or
+  - b) Requiring preservation of specified reasonable legal notices or author
+    attributions in that material or in the Appropriate Legal Notices displayed
+    by works containing it; or
+  - c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in reasonable
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+  - d) Limiting the use for publicity purposes of names of licensors or authors
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+  - e) Declining to grant rights under trademark law for use of some trade
+    names, trademarks, or service marks; or
+  - f) Requiring indemnification of licensors and authors of that material by
+    anyone who conveys the material (or modified versions of it) with
+    contractual assumptions of liability to the recipient, for any liability
+    that these contractual assumptions directly impose on those licensors and
+    authors.
+
+All other non-permissive additional terms are considered *further restrictions*
+within the meaning of section 10. If the Program as you received it, or any
+part of it, contains a notice stating that it is governed by this License along
+with a term that is a further restriction, you may remove that term. If a
+license document contains a further restriction but permits relicensing or
+conveying under this License, you may add to a covered work material governed
+by the terms of that license document, provided that the further restriction
+does not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you must place,
+in the relevant source files, a statement of the additional terms that apply to
+those files, or a notice indicating where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the form of a
+separately written license, or stated as exceptions; the above requirements
+apply either way.
+
+### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly provided
+under this License. Any attempt otherwise to propagate or modify it is void,
+and will automatically terminate your rights under this License (including any
+patent licenses granted under the third paragraph of section 11).
+
+However, if you cease all violation of this License, then your license from a
+particular copyright holder is reinstated
+
+  - a) provisionally, unless and until the copyright holder explicitly and
+    finally terminates your license, and
+  - b) permanently, if the copyright holder fails to notify you of the
+    violation by some reasonable means prior to 60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is reinstated
+permanently if the copyright holder notifies you of the violation by some
+reasonable means, this is the first time you have received notice of violation
+of this License (for any work) from that copyright holder, and you cure the
+violation prior to 30 days after your receipt of the notice.
+
+Termination of your rights under this section does not terminate the licenses
+of parties who have received copies or rights from you under this License. If
+your rights have been terminated and not permanently reinstated, you do not
+qualify to receive new licenses for the same material under section 10.
+
+### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run a copy
+of the Program. Ancillary propagation of a covered work occurring solely as a
+consequence of using peer-to-peer transmission to receive a copy likewise does
+not require acceptance. However, nothing other than this License grants you
+permission to propagate or modify any covered work. These actions infringe
+copyright if you do not accept this License. Therefore, by modifying or
+propagating a covered work, you indicate your acceptance of this License to do
+so.
+
+### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically receives a
+license from the original licensors, to run, modify and propagate that work,
+subject to this License. You are not responsible for enforcing compliance by
+third parties with this License.
+
+An *entity transaction* is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered work
+results from an entity transaction, each party to that transaction who receives
+a copy of the work also receives whatever licenses to the work the party's
+predecessor in interest had or could give under the previous paragraph, plus a
+right to possession of the Corresponding Source of the work from the
+predecessor in interest, if the predecessor has it or can get it with
+reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the rights
+granted or affirmed under this License. For example, you may not impose a
+license fee, royalty, or other charge for exercise of rights granted under this
+License, and you may not initiate litigation (including a cross-claim or
+counterclaim in a lawsuit) alleging that any patent claim is infringed by
+making, using, selling, offering for sale, or importing the Program or any
+portion of it.
+
+### 11. Patents.
+
+A *contributor* is a copyright holder who authorizes use under this License of
+the Program or a work on which the Program is based. The work thus licensed is
+called the contributor's *contributor version*.
+
+A contributor's *essential patent claims* are all patent claims owned or
+controlled by the contributor, whether already acquired or hereafter acquired,
+that would be infringed by some manner, permitted by this License, of making,
+using, or selling its contributor version, but do not include claims that would
+be infringed only as a consequence of further modification of the contributor
+version. For purposes of this definition, *control* includes the right to grant
+patent sublicenses in a manner consistent with the requirements of this
+License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free patent
+license under the contributor's essential patent claims, to make, use, sell,
+offer for sale, import and otherwise run, modify and propagate the contents of
+its contributor version.
+
+In the following three paragraphs, a *patent license* is any express agreement
+or commitment, however denominated, not to enforce a patent (such as an express
+permission to practice a patent or covenant not to sue for patent
+infringement). To *grant* such a patent license to a party means to make such
+an agreement or commitment not to enforce a patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license, and the
+Corresponding Source of the work is not available for anyone to copy, free of
+charge and under the terms of this License, through a publicly available
+network server or other readily accessible means, then you must either
+
+  1. cause the Corresponding Source to be so available, or
+  2. arrange to deprive yourself of the benefit of the patent license for this
+     particular work, or
+  3. arrange, in a manner consistent with the requirements of this License, to
+     extend the patent license to downstream recipients.
+
+*Knowingly relying* means you have actual knowledge that, but for the patent
+license, your conveying the covered work in a country, or your recipient's use
+of the covered work in a country, would infringe one or more identifiable
+patents in that country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or arrangement, you
+convey, or propagate by procuring conveyance of, a covered work, and grant a
+patent license to some of the parties receiving the covered work authorizing
+them to use, propagate, modify or convey a specific copy of the covered work,
+then the patent license you grant is automatically extended to all recipients
+of the covered work and works based on it.
+
+A patent license is *discriminatory* if it does not include within the scope of
+its coverage, prohibits the exercise of, or is conditioned on the non-exercise
+of one or more of the rights that are specifically granted under this License.
+You may not convey a covered work if you are a party to an arrangement with a
+third party that is in the business of distributing software, under which you
+make payment to the third party based on the extent of your activity of
+conveying the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory patent
+license
+
+  - a) in connection with copies of the covered work conveyed by you (or copies
+    made from those copies), or
+  - b) primarily for and in connection with specific products or compilations
+    that contain the covered work, unless you entered into that arrangement, or
+    that patent license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting any implied
+license or other defenses to infringement that may otherwise be available to
+you under applicable patent law.
+
+### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not excuse
+you from the conditions of this License. If you cannot convey a covered work so
+as to satisfy simultaneously your obligations under this License and any other
+pertinent obligations, then as a consequence you may not convey it at all. For
+example, if you agree to terms that obligate you to collect a royalty for
+further conveying from those to whom you convey the Program, the only way you
+could satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+### 13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have permission to
+link or combine any covered work with a work licensed under version 3 of the
+GNU Affero General Public License into a single combined work, and to convey
+the resulting work. The terms of this License will continue to apply to the
+part which is the covered work, but the special requirements of the GNU Affero
+General Public License, section 13, concerning interaction through a network
+will apply to the combination as such.
+
+### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions of the GNU
+General Public License from time to time. Such new versions will be similar in
+spirit to the present version, but may differ in detail to address new problems
+or concerns.
+
+Each version is given a distinguishing version number. If the Program specifies
+that a certain numbered version of the GNU General Public License *or any later
+version* applies to it, you have the option of following the terms and
+conditions either of that numbered version or of any later version published by
+the Free Software Foundation. If the Program does not specify a version number
+of the GNU General Public License, you may choose any version ever published by
+the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions of the
+GNU General Public License can be used, that proxy's public statement of
+acceptance of a version permanently authorizes you to choose that version for
+the Program.
+
+Later license versions may give you additional or different permissions.
+However, no additional obligations are imposed on any author or copyright
+holder as a result of your choosing to follow a later version.
+
+### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
+LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER
+PARTIES PROVIDE THE PROGRAM *AS IS* WITHOUT WARRANTY OF ANY KIND, EITHER
+EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE
+QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
+COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS
+PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
+INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
+THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
+PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY
+HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided above cannot
+be given local legal effect according to their terms, reviewing courts shall
+apply local law that most closely approximates an absolute waiver of all civil
+liability in connection with the Program, unless a warranty or assumption of
+liability accompanies a copy of the Program in return for a fee.
+
+## END OF TERMS AND CONDITIONS ###
+
+### How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible
+use to the public, the best way to achieve this is to make it free software
+which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach
+them to the start of each source file to most effectively state the exclusion
+of warranty; and each file should have at least the *copyright* line and a
+pointer to where the full notice is found.
+
+	<one line to give the program's name and a brief idea of what it does.>
+	Copyright (C) <year>  <name of author>
+	
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+	
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+	
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice like
+this when it starts in an interactive mode:
+
+	<program>  Copyright (C) <year>  <name of author>
+	This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+	This is free software, and you are welcome to redistribute it
+	under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w` and `show c` should show the appropriate
+parts of the General Public License. Of course, your program's commands might
+be different; for a GUI interface, you would use an *about box*.
+
+You should also get your employer (if you work as a programmer) or school, if
+any, to sign a *copyright disclaimer* for the program, if necessary. For more
+information on this, and how to apply and follow the GNU GPL, see
+[http://www.gnu.org/licenses/](http://www.gnu.org/licenses/).
+
+The GNU General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may consider
+it more useful to permit linking proprietary applications with the library. If
+this is what you want to do, use the GNU Lesser General Public License instead
+of this License. But first, please read
+[http://www.gnu.org/philosophy/why-not-lgpl.html](http://www.gnu.org/philosophy/why-not-lgpl.html).

LICENSE.md

@@ -0,0 +1,13 @@
+# Tactility Apps
+
+The Tactility Apps project is available under the [GNU General Public License v3](Documentation/license-apps.md).
+Distributions and forks must adhere to the license terms.
+
+# Libraries
+
+The projects in the `Libraries/` folder have their own license.
+
+# FAQ
+
+- Q: Can I build closed source applications?
+- A: Yes. Only the applications in this repository are GPL-licensed ones. The TactilitySDK license is not a GPL license. It allows for closed source and for-profit apps.

README.md

@@ -1 +1,8 @@
 # Tactility Apps
+
+This project contains various official Tactility apps. Some are usable day-to-day while others are simply feature showcases.
+
+# License
+
+The [Apps](./Apps) are licensed as [GPL v3](Documentation/license-apps.md) while the [Libraries](./Libraries) have their own license.
+Read more about licensing in [LICENSE.md](LICENSE.md).