own_ca_producer ends in PcanCanOperationError

[TurirBarym]

Using the own_ca_producer example for a quick test, and when the time over, the script does not finish completely, but throws the following exception

`
Exception in thread j1939.ecu job_thread:
Traceback (most recent call last):
File "C:\Python3124\Lib\threading.py", line 1073, in _bootstrap_inner
self.run()

File "C:\Python3124\Lib\threading.py", line 1010, in run
self._target(*self._args, **self._kwargs)
File "c:\Users\xxx\venv\Lib\site-packages\j1939\electronic_control_unit.py", line 282, in _async_job_thread
next_wakeup = self.j1939_dll.async_job_thread(now)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "c:\Users\xxx\venv\Lib\site-packages\j1939\j1939_21.py", line 253, in async_job_thread
self.__send_tp_dt(buf['src_address'], buf['dest_address'], data)
File "c:\Users\xxx\venv\Lib\site-packages\j1939\j1939_21.py", line 429, in __send_tp_dt
self.__send_message(mid.can_id, True, data)
File "c:\Users\xxx\venv\Lib\site-packages\j1939\electronic_control_unit.py", line 240, in send_message
self._bus.send(msg)
File "c:\Users\xxx\venv\Lib\site-packages\can\interfaces\pcan\pcan.py", line 655, in send
raise PcanCanOperationError(
can.interfaces.pcan.pcan.PcanCanOperationError: Failed to send: A PCAN Channel has not been initialized yet or the initialization process has failed
`

Further test with adding a time.time(10) between ca.stop() and ecu.disconnect shows that the timed are not stopped but continue being set until ecu.disconnect closes the can connection leading to the exception.