lte service (backend) and ui handling

pi/backend/main.py

@@ -9,6 +9,7 @@ from flask_socketio import SocketIO, emit
 from gps_service import GPSService
 from arduino_service import ArduinoService
 from gpio_service import GPIOService
+from lte_service import LteService
 from throttle import Throttle
 
 app = Flask(__name__)
@@ -21,10 +22,12 @@ socketio = SocketIO(app, async_mode="gevent", cors_allowed_origins="*")
 gps = GPSService()
 arduino = ArduinoService()
 gpio = GPIOService()
+lte = LteService()
 
-# Throttles for emission rate limiting (20Hz for arduino, 1Hz for GPS)
+# Throttles for emission rate limiting (20Hz for arduino, 1Hz for GPS, 5s for LTE)
 arduino_throttle = Throttle(min_interval=0.05)  # 20Hz max
 gps_throttle = Throttle(min_interval=1.0)      # 1Hz max
+lte_throttle = Throttle(min_interval=5.0)      # Every 5s — signal doesn't need real-time
 
 # Track connected clients
 connected_clients = set()
@@ -57,6 +60,10 @@ def handle_connect():
     if "error" not in gps_data:
         emit("gps", gps_data)
 
+    lte_data = lte.get_latest()
+    if "error" not in lte_data:
+        emit("lte", lte_data)
+
 
 @socketio.on("disconnect")
 def handle_disconnect():
@@ -147,6 +154,14 @@ def on_gps_data(data):
     gps_throttle.maybe_emit(data, emit_fn)
 
 
+def on_lte_data(data):
+    """Called by LteService when new status polled."""
+    def emit_fn(d):
+        socketio.emit("lte", d)
+
+    lte_throttle.maybe_emit(data, emit_fn)
+
+
 def on_arduino_ack(cmd, status, extra):
     """Called by ArduinoService when ACK received from Arduino."""
     socketio.emit("ack", {
@@ -172,6 +187,9 @@ def throttle_flusher():
         if gps_throttle.has_pending:
             gps_throttle.flush(lambda d: socketio.emit("gps", d))
 
+        if lte_throttle.has_pending:
+            lte_throttle.flush(lambda d: socketio.emit("lte", d))
+
 
 # -----------------------------------------------------------------------------
 # REST API (backward compatibility)
@@ -181,11 +199,14 @@ def throttle_flusher():
 def health():
     """Health check endpoint."""
     gps_latest = gps.get_latest()
+    lte_latest = lte.get_latest()
     return jsonify({
         "status": "ok",
         "gps_connected": gps.connected,
         "gps_state": gps_latest.get("gps_state", "acquiring"),
         "arduino_connected": arduino.connected,
+        "lte_connected": lte.connected,
+        "lte_signal": lte_latest.get("signal"),
         "ws_clients": len(connected_clients),
     })
 
@@ -202,6 +223,12 @@ def gps_history():
     return jsonify(gps.get_buffer())
 
 
+@app.route("/lte")
+def lte_data():
+    """Current LTE modem status."""
+    return jsonify(lte.get_latest())
+
+
 @app.route("/arduino")
 def arduino_data():
     """Current Arduino telemetry (voltage, rpm, etc)."""
@@ -224,11 +251,13 @@ def main():
     arduino.set_on_data(on_arduino_data)
     arduino.set_on_ack(on_arduino_ack)
     gps.set_on_data(on_gps_data)
+    lte.set_on_data(on_lte_data)
 
     # Start services
     gps.start()
     arduino.start()
     gpio.start()
+    lte.start()
 
     # Start throttle flusher in background
     socketio.start_background_task(throttle_flusher)
@@ -241,6 +270,7 @@ def main():
         arduino.stop()
         gps.stop()
         gpio.stop()
+        lte.stop()
 
 
 if __name__ == "__main__":