Implement crash handler and diagnostics app (#119)

Tactility/Source/app/crashdiagnostics/QrUrl.cpp

@@ -0,0 +1,43 @@
+#ifdef ESP_TARGET
+
+#include "QrUrl.h"
+
+#include "kernel/PanicHandler.h"
+#include "Log.h"
+
+#include <sstream>
+#include <esp_cpu_utils.h>
+
+std::string getUrlFromCrashData() {
+    auto* crash_data = getRtcCrashData();
+    auto* stack_buffer = (uint32_t*) malloc(crash_data->callstackLength * 2 * sizeof(uint32_t));
+    for (int i = 0; i < crash_data->callstackLength; ++i) {
+        const CallstackFrame&frame = crash_data->callstack[i];
+        uint32_t pc = esp_cpu_process_stack_pc(frame.pc);
+        uint32_t sp = frame.sp;
+        stack_buffer[i * 2] = pc;
+        stack_buffer[(i * 2) + 1] = sp;
+    }
+
+    assert(sizeof(CallstackFrame) == 8);
+
+    std::stringstream stream;
+
+    stream << "https://oops.bytewelder.com?";
+    stream << "i=1"; // Application id
+    stream << "&v=" << TT_VERSION; // Version
+    stream << "&a=" << CONFIG_IDF_TARGET; // Architecture
+    stream << "&s="; // Stacktrace
+
+    for (int i = crash_data->callstackLength - 1; i >= 0; --i) {
+        uint32_t pc = stack_buffer[(i * 2)];
+        uint32_t sp = stack_buffer[(i * 2) + 1];
+        stream << std::hex << pc << std::hex << sp;
+    }
+
+    free(stack_buffer);
+
+    return stream.str();
+}
+
+#endif