startbroker --port option not obeyed

[harmv]

startbroker.py has an option --port, but thats ignored

h3. steps to reproduce

paho.mqtt.testing/interoperability/startbroker.py --port=1889

or

paho.mqtt.testing/interoperability/startbroker.py --port 1889

h3. expected result

a broker is started that listens on port 1889

h3. actual result

The startbroker.py always binds on 1883, no matter what --port option is given

INFO 20210121 173113 Starting TCP listener on address '' port 1883

h3. version

2873885 (Fri Oct 2 19:16:08 2020 +0100)

[wolkenarchitekt]

Indeed paho.mqtt.testing ignores all configs, settings and parameters to set port or host.
This change I made demonstrates a minimal modification to the code that will properly set the host/port in a very hacky way:
wolkenarchitekt@90e5368
Fixing this properly will take a longer time, due to the code "structure" of paho.mqtt.testing.