Implement CanProtocol for robotellBus

Author: lumagi

can/interfaces/robotell.py

@@ -3,11 +3,11 @@
 """
 
 import io
-import time
 import logging
+import time
 from typing import Optional
 
-from can import BusABC, Message
+from can import BusABC, Message, CanProtocol
 from ..exceptions import CanInterfaceNotImplementedError, CanOperationError
 
 logger = logging.getLogger(__name__)
@@ -96,7 +96,7 @@ def __init__(
         )
         logger.info("Using device: %s", self.channel_info)
 
-        super().__init__(channel=channel, **kwargs)
+        super().__init__(channel=channel, protocol=CanProtocol.CAN_20, **kwargs)
 
     def set_bitrate(self, bitrate):
         """

test/test_robotell.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import unittest
+
 import can
 
 
@@ -14,6 +15,9 @@ def setUp(self):
     def tearDown(self):
         self.bus.shutdown()
 
+    def test_protocol(self):
+        self.assertEqual(self.bus.protocol, can.CanProtocol.CAN_20)
+
     def test_recv_extended(self):
         self.serial.write(
             bytearray(