backend: move gui/backends.py to backend/serial.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/backends.py

@@ -1,66 +0,0 @@
-import sys, os
-from threading import Thread
-from queue    import Queue, Empty
-
-_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-_gui  = os.path.dirname(os.path.abspath(__file__))
-for _p in [_root, _gui]:
-    if _p not in sys.path:
-        sys.path.insert(0, _p)
-
-from backend.a_backend import ABackend
-from a_transceiver import ATransceiver
-from msg.container import MsgContainer
-
-
-class SerialBackend(ABackend):
-    """Backend that reads from a serial (COM / tty) port."""
-
-    def __init__(self, port: str, baud_rate: int = 115200):
-        self._port    = port
-        self._baud    = baud_rate
-        self._serial  = None
-        self._xcvr    = None
-        self._running = False
-        self._queue: Queue = Queue()
-        self._thread  = Thread(target=self._run, daemon=True)
-
-    def register_xcvr(self, xcvr):
-        self._xcvr = xcvr
-        xcvr.on_register(self)
-
-    def send(self, xcvr: ATransceiver, data: bytes):
-        self._queue.put(data)
-
-    def connect(self):
-        import serial
-        self._serial  = serial.Serial(self._port, self._baud, timeout=0.1)
-        self._running = True
-
-    def start(self):
-        self._thread.start()
-
-    def stop(self):
-        self._running = False
-        if self._thread.is_alive():
-            self._thread.join(timeout=2.0)
-
-    def disconnect(self):
-        if self._serial and self._serial.is_open:
-            self._serial.close()
-
-    def _run(self):
-        while self._running:
-            try:
-                data = self._serial.read(64)
-                if data and self._xcvr:
-                    self._xcvr.on_recv(MsgContainer(data, self._xcvr))
-                # Drain outgoing queue
-                while True:
-                    try:
-                        self._serial.write(self._queue.get_nowait())
-                    except Empty:
-                        break
-            except Exception:
-                self._running = False
-                break

gui/data_model.py

@@ -147,7 +147,7 @@ class ReceiverManager(QObject):
 
     def connect_receiver(self, rid: str):
         from listeners import NavSatQtListener, GsaQtListener
-        from backends  import SerialBackend
+        from backend.serial import SerialBackend
 
         config = self._configs.get(rid)
         state  = self._states.get(rid)