diff --git a/dronecan/driver/python_can.py b/dronecan/driver/python_can.py
index a457d73..2b9ec24 100644
--- a/dronecan/driver/python_can.py
+++ b/dronecan/driver/python_can.py
@@ -99,8 +99,10 @@ def _writer_thread_loop(self):
                                     data=list(frame.data),
                                 )
                             self._bus.send(msg)
-                            self._bus.flush_tx_buffer()
-
+                            try:
+                                self._bus.flush_tx_buffer()
+                            except NotImplementedError:
+                                pass
                             frame.ts_monotonic = time.monotonic()
                             frame.ts_real = time.time()
                             self._write_feedback_queue.put(frame)
@@ -136,8 +138,6 @@ def close(self):
         def receive(self, timeout=None):
             self._check_write_feedback()
 
-            timeout = -1 if timeout is None else (timeout * 1000)
-
             try:
                 msg = self._bus.recv(timeout=timeout)
                 if msg is not None: