add board cache

core/services/ardupilot_manager/flight_controller_detector/Detector.py

@@ -10,8 +10,11 @@
 
 
 class Detector:
-    @staticmethod
-    def detect_linux_board() -> Optional[FlightController]:
+    last_detected_linux_board: Optional[FlightController] = None
+    misses = 0  # tracker for the number of times a Linux board was not detected in a row
+
+    @classmethod
+    def detect_linux_board(cls) -> Optional[FlightController]:
         """Returns Linux board if connected.
         Check for connection using the sensors on the I²C and SPI buses.
 
@@ -50,12 +53,20 @@ def is_argonot_r1_connected() -> bool:
         logger.debug("Trying to detect Linux board.")
         if is_navigator_r5_connected():
             logger.debug("Navigator R5 detected.")
-            return FlightController(name="Navigator", manufacturer="Blue Robotics", platform=Platform.Navigator)
+            board = FlightController(name="Navigator", manufacturer="Blue Robotics", platform=Platform.Navigator)
         if is_argonot_r1_connected():
             logger.debug("Argonot R1 detected.")
-            return FlightController(name="Argonot", manufacturer="SymbyTech", platform=Platform.Argonot)
+            board = FlightController(name="Argonot", manufacturer="SymbyTech", platform=Platform.Argonot)
+        if board:
+            cls.misses = 0
+            cls.last_detected_linux_board = board
+            return board
         logger.debug("No Linux board detected.")
-        return None
+        cls.misses += 1
+        if cls.misses > 3:
+            cls.last_detected_linux_board = None
+        logger.debug(f"Returning ached Linux board: {cls.last_detected_linux_board}")
+        return cls.last_detected_linux_board
 
     @staticmethod
     def is_serial_bootloader(port: SysFS) -> bool: