MqttTransport: Calls _on_connect multiple times

[zxdavb]

Traceback:

2024-03-16 16:47:31.368 ERROR (MainThread) [homeassistant] Error doing job: Exception in callback QosProtocol.connection_made(MqttTransport...len(queue)=0)), ramses=True)():   File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 3591, in _thread_main
    self.loop_forever(retry_first_connection=True)
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 1756, in loop_forever
    rc = self._loop(timeout)
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 1164, in _loop
    rc = self.loop_read()
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 1556, in loop_read
    rc = self._packet_read()
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 2439, in _packet_read
    rc = self._packet_handle()
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 3039, in _packet_handle
    return self._handle_connack()
  File "/home/dbonnes/clients/hass/venv/lib/python3.12/site-packages/paho/mqtt/client.py", line 3138, in _handle_connack
    on_connect(
  File "/home/dbonnes/clients/ramses_rf/src/ramses_tx/transport.py", line 975, in _on_connect
    self.loop.call_soon_threadsafe(
Traceback (most recent call last):
  File "/usr/lib/python3.12/asyncio/events.py", line 84, in _run
    self._context.run(self._callback, *self._args)
  File "/home/dbonnes/clients/ramses_rf/src/ramses_tx/protocol.py", line 581, in connection_made
    super().connection_made(transport, ramses=ramses)
  File "/home/dbonnes/clients/ramses_rf/src/ramses_tx/protocol.py", line 488, in connection_made
    self._set_active_hgi(self._transport.get_extra_info(SZ_ACTIVE_HGI))
  File "/home/dbonnes/clients/ramses_rf/src/ramses_tx/protocol.py", line 341, in _set_active_hgi
    assert self._active_hgi is None  # should only be called once
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

[zxdavb]

During init - _on_connect() is called & invokes Protocol.connection_made(), but this can happen again, later on.

[zxdavb]

I believe this is 'normal' behaviour from MQTT/ramses_esp.