Adolfo Reyna
527 lines
23 KiB
Python
527 lines
23 KiB
Python
import socket
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import json
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import time
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class MCPServer:
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"""A lightweight JSON-RPC HTTP server implementing Model Context Protocol (MCP) endpoints."""
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def __init__(self, display, led, battery, sensor, rtc, ble):
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self.display = display
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self.led = led
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self.battery = battery
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self.sensor = sensor
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self.rtc = rtc
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self.ble = ble
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self.sock = None
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self.active_led_mode = "off" # static, breath, rainbow, off
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self.override_active = False
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def start(self, port=80):
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"""Starts the TCP server non-blockingly."""
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self.sock.bind(('', port))
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self.sock.listen(3)
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# Set socket to non-blocking so the main loop can run animations concurrently
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self.sock.setblocking(False)
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print(f"MCP server listening on port {port}...")
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def update(self):
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"""Check for incoming HTTP requests and handle them non-blockingly."""
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if self.sock is None:
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return
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try:
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client, addr = self.sock.accept()
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except OSError:
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# No incoming connection
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return
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try:
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# Handle incoming connection
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client.settimeout(2.0)
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req = client.recv(2048).decode('utf-8')
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# Simple HTTP parser
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lines = req.split('\r\n')
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if len(lines) == 0:
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client.close()
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return
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first_line = lines[0]
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parts = first_line.split(' ')
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if len(parts) < 3:
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client.close()
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return
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method, path = parts[0], parts[1]
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if method == 'POST' and path == '/api/mcp':
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# Read content length
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content_length = 0
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for line in lines:
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if line.lower().startswith('content-length:'):
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content_length = int(line.split(':')[1].strip())
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break
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# Locate start of JSON body
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body = ""
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if '\r\n\r\n' in req:
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body = req.split('\r\n\r\n', 1)[1]
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# Read remaining body if not fully received
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while len(body) < content_length:
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body += client.recv(1024).decode('utf-8')
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# Parse JSON-RPC 2.0 Request
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rpc_req = json.loads(body)
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rpc_resp = self._handle_rpc(rpc_req)
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# Send HTTP Response
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resp_body = json.dumps(rpc_resp)
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resp = "HTTP/1.1 200 OK\r\n"
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resp += "Content-Type: application/json\r\n"
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resp += f"Content-Length: {len(resp_body)}\r\n"
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resp += "Connection: close\r\n\r\n"
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resp += resp_body
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client.send(resp.encode('utf-8'))
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else:
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# Return 404
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resp = "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\nConnection: close\r\n\r\n"
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client.send(resp.encode('utf-8'))
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except Exception as e:
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print("Error handling client:", e)
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finally:
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client.close()
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def _handle_rpc(self, req):
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rpc_id = req.get('id')
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method = req.get('method')
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params = req.get('params', {})
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if method == 'tools/list':
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return {
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"jsonrpc": "2.0",
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"result": {
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"tools": [
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{
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"name": "clear_screen",
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"description": "Clear the 400x300 screen to white (0) or black (1).",
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"inputSchema": {
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"type": "object",
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"properties": {
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"color": {"type": "integer", "enum": [0, 1], "description": "0 = White, 1 = Black"}
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},
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"required": ["color"]
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}
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},
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{
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"name": "draw_text",
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"description": "Draw text on the screen at specified (x,y) coordinates.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"text": {"type": "string", "description": "The message to display"},
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"x": {"type": "integer", "description": "X coordinate (0-390)"},
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"y": {"type": "integer", "description": "Y coordinate (0-290)"},
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"size": {"type": "integer", "enum": [1, 2], "description": "Text scale (1=normal, 2=large)"}
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},
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"required": ["text", "x", "y"]
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}
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},
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{
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"name": "set_led",
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"description": "Control the onboard WS2812 NeoPixel RGB LED.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"r": {"type": "integer", "minimum": 0, "maximum": 255, "description": "Red channel (0-255)"},
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"g": {"type": "integer", "minimum": 0, "maximum": 255, "description": "Green channel (0-255)"},
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"b": {"type": "integer", "minimum": 0, "maximum": 255, "description": "Blue channel (0-255)"},
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"mode": {"type": "string", "enum": ["static", "breath", "rainbow", "off"], "description": "LED mode"}
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},
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"required": ["r", "g", "b", "mode"]
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}
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},
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{
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"name": "get_battery",
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"description": "Read the current battery voltage and estimated capacity percentage.",
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"inputSchema": {"type": "object", "properties": {}}
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},
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{
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"name": "get_sensors",
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"description": "Read onboard SHTC3 temperature and relative humidity.",
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"inputSchema": {"type": "object", "properties": {}}
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},
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{
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"name": "scan_ble",
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"description": "Scan for nearby Bluetooth Low Energy devices / tracking tags.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"duration_ms": {"type": "integer", "description": "Scan duration in milliseconds (default 3000)"}
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}
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}
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},
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{
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"name": "get_screenshot",
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"description": "Capture the current reflective LCD screen rendering as a PNG image.",
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"inputSchema": {"type": "object", "properties": {}}
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},
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{
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"name": "draw_image",
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"description": "Draw an image (PNG, JPEG, GIF, BMP, etc.) on the screen. The image will be converted to 1-bit monochrome and fit to display boundaries.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"image_base64": {"type": "string", "description": "Base64 encoded string of the source image file"},
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"x": {"type": "integer", "description": "X coordinate to place the image (default 0)", "default": 0},
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"y": {"type": "integer", "description": "Y coordinate to place the image (default 0)", "default": 0},
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"dither": {"type": "boolean", "description": "Whether to use Floyd-Steinberg dithering (default true)", "default": True}
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},
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"required": ["image_base64"]
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}
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},
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{
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"name": "write_file",
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"description": "Write a file (e.g., python script or config) to the board's flash storage.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"path": {"type": "string", "description": "The destination file path (e.g. 'my_script.py')"},
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"content": {"type": "string", "description": "The text content of the file"}
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},
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"required": ["path", "content"]
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}
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},
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{
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"name": "read_file",
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"description": "Read a text file from the board's flash storage.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"path": {"type": "string", "description": "The file path to read (e.g. 'boot.py')"}
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},
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"required": ["path"]
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}
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},
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{
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"name": "execute_python",
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"description": "Execute arbitrary Python code dynamically on the board. Standard output (prints) and errors will be captured and returned.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"code": {"type": "string", "description": "The Python code to execute"}
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},
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"required": ["code"]
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}
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},
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{
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"name": "play_tone",
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"description": "Play a pure sine wave tone/beep on the board speaker.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"frequency": {"type": "integer", "description": "Frequency of the tone in Hz (e.g. 440 for A4, default 440)", "default": 440},
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"duration_ms": {"type": "integer", "description": "Duration of the tone in milliseconds (default 1000)", "default": 1000},
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"volume": {"type": "integer", "description": "Volume of the tone from 0 to 100 (default 50)", "default": 50}
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}
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}
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},
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{
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"name": "play_audio",
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"description": "Play a standard WAV audio file on the speaker.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"filename": {"type": "string", "description": "WAV file path to play (e.g. 'response.wav')"},
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"volume": {"type": "integer", "description": "Volume from 0 to 100 (default 50)", "default": 50}
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},
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"required": ["filename"]
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}
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},
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{
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"name": "record_voice",
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"description": "Record voice command from the microphone to a raw stereo PCM file.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"duration_sec": {"type": "integer", "description": "Duration in seconds (default 4)", "default": 4},
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"filename": {"type": "string", "description": "Destination file path (e.g. 'recording.pcm')", "default": "recording.pcm"}
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}
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}
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},
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{
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"name": "play_audio_base64",
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"description": "Decode a base64-encoded WAV file and play it directly on the speaker.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"wav_base64": {"type": "string", "description": "Base64 encoded string of the WAV audio file"},
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"volume": {"type": "integer", "description": "Volume from 0 to 100 (default 50)", "default": 50}
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},
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"required": ["wav_base64"]
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}
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}
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]
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},
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"id": rpc_id
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}
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elif method == 'tools/call':
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tool_name = params.get('name')
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args = params.get('arguments', {})
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try:
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content = self._call_tool(tool_name, args)
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return {
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"jsonrpc": "2.0",
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"result": {
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"content": [
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{
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"type": "text",
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"text": content
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}
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]
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},
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"id": rpc_id
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}
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except Exception as e:
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return {
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"jsonrpc": "2.0",
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"error": {
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"code": -32000,
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"message": str(e)
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},
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"id": rpc_id
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}
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return {
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"jsonrpc": "2.0",
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"error": {
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"code": -32601,
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"message": f"Method {method} not found"
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},
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"id": rpc_id
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}
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def _call_tool(self, name, args):
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"""Executes hardware actions depending on the called tool name."""
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if name == "clear_screen":
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self.override_active = True
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color = int(args.get("color", 0))
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self.display.clear(color)
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self.display.show()
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return "Screen cleared."
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elif name == "draw_text":
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self.override_active = True
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text = str(args.get("text", ""))
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x = int(args.get("x", 10))
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y = int(args.get("y", 10))
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size = int(args.get("size", 1))
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if size == 2:
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self.display.text_large(text, x, y, scale=2, c=1)
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else:
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self.display.text(text, x, y, 1)
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self.display.show()
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return f"Successfully drew text '{text}' at ({x}, {y}) with size {size}."
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elif name == "set_led":
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r = int(args.get("r", 0))
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g = int(args.get("g", 0))
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b = int(args.get("b", 0))
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mode = str(args.get("mode", "static"))
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self.active_led_mode = mode
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if mode == "static":
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self.led.set_color(r, g, b)
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elif mode == "off":
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self.led.off()
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else:
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# Store base color for animations
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self.led.base_color = (r, g, b)
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return f"LED set to mode '{mode}' with base color ({r}, {g}, {b})."
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elif name == "get_battery":
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v = self.battery.read_voltage()
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p = self.battery.read_percentage()
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return json.dumps({"voltage_v": v, "percentage_pct": p})
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elif name == "get_sensors":
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t, h = self.sensor.read_sensor()
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return json.dumps({"temperature_c": t, "humidity_pct": h})
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elif name == "scan_ble":
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dur = int(args.get("duration_ms", 3000))
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# Scan returns dictionary: {mac: {rssi: rssi, name: name}}
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devices = self.ble.scan(dur)
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return json.dumps(devices)
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elif name == "get_screenshot":
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import binascii
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filename = 'screenshot_mcp.pbm'
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try:
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self.display.save_screenshot(filename)
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with open(filename, 'rb') as f:
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data = f.read()
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# Encode to base64
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b64 = binascii.b2a_base64(data).decode('utf-8').strip()
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return f"__PBM_BASE64__:{b64}"
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except Exception as e:
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raise RuntimeError(f"Screenshot capture failed: {e}")
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elif name == "draw_image":
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self.override_active = True
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pbm_b64 = args.get("pbm_base64")
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x = int(args.get("x", 0))
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y = int(args.get("y", 0))
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if not pbm_b64:
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raise ValueError("Missing pbm_base64 parameter (preprocessed by bridge)")
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import binascii
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pbm_bytes = binascii.a2b_base64(pbm_b64)
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filename = 'temp_recv.pbm'
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with open(filename, 'wb') as f:
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f.write(pbm_bytes)
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try:
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self.display.draw_pbm(filename, x, y, scale=1)
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self.display.show()
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finally:
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import os
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try:
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os.remove(filename)
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except:
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pass
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return "Image displayed successfully."
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elif name == "write_file":
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path = str(args.get("path"))
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content = str(args.get("content"))
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with open(path, 'w') as f:
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f.write(content)
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return f"Successfully wrote {len(content)} characters to '{path}'."
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elif name == "read_file":
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path = str(args.get("path"))
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with open(path, 'r') as f:
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content = f.read()
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return content
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elif name == "execute_python":
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code = str(args.get("code"))
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import builtins
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import sys
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import io
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output_buffer = []
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old_print = builtins.print
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def custom_print(*args, **kwargs):
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sep = kwargs.get('sep', ' ')
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end = kwargs.get('end', '\n')
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str_args = [str(arg) for arg in args]
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msg = sep.join(str_args) + end
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output_buffer.append(msg)
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builtins.print = custom_print
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error = None
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try:
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exec(code, globals())
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except Exception as e:
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tb_file = io.StringIO()
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sys.print_exception(e, tb_file)
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error_msg = tb_file.getvalue()
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output_buffer.append(f"\nExecution Failed:\n{error_msg}")
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error = e
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finally:
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builtins.print = old_print
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output = "".join(output_buffer)
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if error:
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return output
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return f"Execution Succeeded. Console output:\n{output}"
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elif name == "play_tone":
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freq = int(args.get("frequency", 440))
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duration = int(args.get("duration_ms", 1000))
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vol = int(args.get("volume", 50))
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# Limit duration to prevent blocking the main loop for too long
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duration = max(50, min(5000, duration))
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freq = max(50, min(10000, freq))
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vol = max(0, min(100, vol))
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from audio_util import play_tone
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play_tone(frequency=freq, duration_ms=duration, volume=vol)
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return f"Played tone of {freq}Hz for {duration}ms at volume {vol}."
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elif name == "play_audio":
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filename = str(args.get("filename"))
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vol = int(args.get("volume", 50))
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vol = max(0, min(100, vol))
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from audio_util import play_wav
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success = play_wav(filename, volume=vol)
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if success:
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return f"Successfully played audio file '{filename}'."
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else:
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raise RuntimeError(f"Failed to play audio file '{filename}'. Check format (16kHz 16-bit PCM WAV recommended).")
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elif name == "record_voice":
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duration = int(args.get("duration_sec", 4))
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filename = str(args.get("filename", "recording.pcm"))
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# Clamp duration to a reasonable range
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duration = max(1, min(15, duration))
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from audio_util import record_audio
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success = record_audio(duration_seconds=duration, filename=filename)
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if success:
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return f"Successfully recorded {duration} seconds of audio to '{filename}'."
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else:
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raise RuntimeError("Audio recording failed.")
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elif name == "play_audio_base64":
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b64_data = args.get("wav_base64")
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vol = int(args.get("volume", 50))
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vol = max(0, min(100, vol))
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if not b64_data:
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raise ValueError("Missing wav_base64 parameter.")
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import binascii
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try:
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audio_bytes = binascii.a2b_base64(b64_data)
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except Exception as e:
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raise ValueError(f"Failed to decode base64 audio: {e}")
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filename = "temp_play.wav"
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with open(filename, "wb") as f:
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f.write(audio_bytes)
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try:
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from audio_util import play_wav
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success = play_wav(filename, volume=vol)
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|
finally:
|
|
import os
|
|
try:
|
|
os.remove(filename)
|
|
except:
|
|
pass
|
|
|
|
if success:
|
|
return "Successfully played base64 audio stream."
|
|
else:
|
|
raise RuntimeError("Failed to play decoded audio stream. Check format (16kHz 16-bit PCM WAV recommended).")
|
|
|
|
else:
|
|
raise ValueError(f"Unknown tool: {name}")
|