Simple MCP client for Serial Studio
| 29 | |
| 30 | |
| 31 | class MCPClient: |
| 32 | """Simple MCP client for Serial Studio""" |
| 33 | |
| 34 | def __init__(self, host="localhost", port=7777): |
| 35 | self.host = host |
| 36 | self.port = port |
| 37 | self.sock = None |
| 38 | self.request_id = 0 |
| 39 | self._buffer = b"" |
| 40 | |
| 41 | def connect(self): |
| 42 | """Connect to Serial Studio API server""" |
| 43 | try: |
| 44 | self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| 45 | self.sock.connect((self.host, self.port)) |
| 46 | print(f"✓ Connected to Serial Studio at {self.host}:{self.port}") |
| 47 | except ConnectionRefusedError: |
| 48 | print(f"\n✗ Connection refused to {self.host}:{self.port}") |
| 49 | print("\nMake sure:") |
| 50 | print(" 1. Serial Studio is running") |
| 51 | print(" 2. API Server is enabled in Settings (⚙️)") |
| 52 | print(' Enable "Enable API Server (Port 7777)" switch') |
| 53 | print(" 3. No firewall is blocking port 7777\n") |
| 54 | raise |
| 55 | |
| 56 | def send_request(self, method, params=None): |
| 57 | """Send MCP JSON-RPC 2.0 request""" |
| 58 | self.request_id += 1 |
| 59 | request = { |
| 60 | "jsonrpc": "2.0", |
| 61 | "id": self.request_id, |
| 62 | "method": method, |
| 63 | "params": params or {}, |
| 64 | } |
| 65 | |
| 66 | message = json.dumps(request) + "\n" |
| 67 | self.sock.sendall(message.encode("utf-8")) |
| 68 | |
| 69 | response = self._read_response(self.request_id) |
| 70 | return response |
| 71 | |
| 72 | def _read_line(self): |
| 73 | """Read one newline-delimited JSON line, preserving leftover data""" |
| 74 | while b"\n" not in self._buffer: |
| 75 | chunk = self.sock.recv(4096) |
| 76 | if not chunk: |
| 77 | raise ConnectionError("Connection closed by server") |
| 78 | self._buffer += chunk |
| 79 | |
| 80 | line, self._buffer = self._buffer.split(b"\n", 1) |
| 81 | return json.loads(line.decode("utf-8")) |
| 82 | |
| 83 | def _read_response(self, request_id): |
| 84 | """Read lines until we get the JSON-RPC response matching request_id. |
| 85 | |
| 86 | The server may send raw data events ({"data": "..."}) interleaved |
| 87 | with JSON-RPC responses. These are silently skipped. |
| 88 | """ |