Improve axidraw logging

README.md

@@ -62,6 +62,7 @@ ros2 run robot_controller dummy_controller
 
 AxidrawController draws on the axidraw robot.
 Find the serial device in "/dev/", it is usually named "/dev/ttyACMX" where X is usually 0.
+Try a different serial port if the axidraw_controller continuously logs a message about failing to connect.
 ``` sh
 ros2 launch axidraw_controller axidraw_controller serial_port:=/dev/ttyACM0
 ```

src/axidraw_controller/src/py/axidraw_serial.py

@@ -83,7 +83,8 @@ class AxidrawSerial(Node):
         self.status_srv = self.create_service(Status, 'axidraw_status', self.get_status)
 
         while not self.init_serial(port):
-            self.get_logger().error("Failed to connect to axidraw on port:{}".format(port))
+            self.get_logger().error("Failed to connect to axidraw on port:{}, retrying".format(port))
+        self.get_logger().info("Successfully connected to axidraw on port:{}".format(port))
 
         self.move_sub = self.create_subscription(Point, 'axidraw_move', self.move_callback, qos_profile=QoSProfile(depth=1))
         self.penup_sub = self.create_subscription(Empty, 'axidraw_penup', self.penup_callback, qos_profile=QoSProfile(depth=1))