Logging received serial data

gauge.py

@@ -146,7 +146,7 @@ ARDUINO_TX_PIN = int(_cfg.get("arduino_tx_pin", 17))
 ARDUINO_RX_PIN = int(_cfg.get("arduino_rx_pin", 16))
 ARDUINO_BAUD = int(_cfg.get("arduino_baud", 115200))
 
-_arduino = UART(ARDUINO_UART_ID, baudrate=ARDUINO_BAUD, tx=ARDUINO_TX_PIN, rx=ARDUINO_RX_PIN)
+_arduino = UART(ARDUINO_UART_ID, baudrate=ARDUINO_BAUD, tx=ARDUINO_TX_PIN, rx=ARDUINO_RX_PIN, timeout=10)
 
 
 def arduino_send(cmd):
@@ -155,6 +155,14 @@ def arduino_send(cmd):
     info(f"Arduino → {cmd}")
 
 
+def arduino_recv():
+    """Print any lines waiting in the Arduino RX buffer."""
+    while _arduino.any():
+        line = _arduino.readline()
+        if line:
+            print(f"[{_ts()}] ARDU   {line.decode().strip()}")
+
+
 # ---------------------------------------------------------------------------
 # Arduino command helpers
 # ---------------------------------------------------------------------------
@@ -845,6 +853,7 @@ def main():
                 continue
 
             client_ref.check_msg()
+            arduino_recv()
             _flush_backlight_state()
 
             # Periodic re-home