Enhance CAN bus scripts with argparse and error handling

- Improved error handling in `python_enable_motor.py` by capturing and displaying exception details.
- Ensured proper CAN bus shutdown in `python_enable_motor.py` with a `finally` block.
- Refactored `python_send_angle.py` to accept a command-line argument for the target angle instead of looping indefinitely.
- Refactored `python_send_velocity.py` to accept a command-line argument for target speed and removed infinite loops for better usability.
- Added `send_velocity_impulses.py`, a new script to send alternating velocity impulses over the CAN bus.

controller/fw/embed/test/python_enable_motor.py

@@ -20,12 +20,13 @@ def send_motor_enable(bus, enable):
         state = "enabled" if enable else "disabled"
         print(f"Sent message to {state} motor")
         print(f"Message data: {msg.data}")
-    except can.CanError:
-        print("Message failed to send")
+    except can.CanError as e:
+        print(f"Message failed to send: {e}")
         sys.exit(1)  # Exit the program on failure
 
 def main():
     # CAN interface setup
+    bus = None  # Define outside the try block for proper shutdown
     try:
         bus = can.interface.Bus(channel='can0', bustype='socketcan', bitrate=1000000)  # Ensure the bitrate matches the microcontroller settings
         print("CAN bus initialized.")
@@ -43,5 +44,11 @@ def main():
         print(f"Error initializing CAN bus: {e}")
         sys.exit(1)
 
+    finally:
+        # Ensure the bus is properly shut down
+        if bus is not None:
+            bus.shutdown()
+            print("CAN bus shut down.")
+
 if __name__ == '__main__':
     main()