fix arm not spinning

src/arm_pkg/arm_pkg/arm_node.py

@@ -76,9 +76,10 @@ class SerialRelay(Node):
         thread.start()
         
         #if in arm mode, will need to read from the MCU 
-        if self.launch_mode == 'arm':
+
         try:
             while rclpy.ok():
+                if self.launch_mode == 'arm':
                     if self.ser.in_waiting:
                         self.read_mcu()
                     else: