Hi - I managed to get the Texecom2mqtt plugin up and running and communicating with my alarm system, there is a reliance on MosquittoMQTT as the broker but I am having problems there with the following messages as per the log below.
I apologise if this is a really obvious issue, I am a newbie and only mildly technical 
One thing to point out is the internal network IP address range is on 192.168 so not sure if HA creates the 127 addresses?
[s6-init] making user provided files available at /var/run/s6/etc…exited 0.
[s6-init] ensuring user provided files have correct perms…exited 0.
[fix-attrs.d] applying ownership & permissions fixes…
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts…
[cont-init.d] mosquitto.sh: executing…
[15:14:30] INFO: SSL is not enabled
[cont-init.d] mosquitto.sh: exited 0.
[cont-init.d] nginx.sh: executing…
[cont-init.d] nginx.sh: exited 0.
[cont-init.d] done.
[services.d] starting services
[services.d] done.
[15:14:31] INFO: Starting NGINX for authentication handling…
[15:14:31] INFO: Starting mosquitto MQTT broker…
1624025671: mosquitto version 1.6.12 starting
1624025671: |-- *** auth-plug: startup
[15:14:32] INFO: Successfully send discovery information to Home Assistant.
[15:14:32] INFO: Successfully send service information to the Supervisor.
1624025671: Config loaded from /etc/mosquitto/mosquitto.conf.
1624025671: Loading plugin: /usr/share/mosquitto/auth-plug.so
1624025671: ├── Username/password checking enabled.
1624025671: ├── TLS-PSK checking enabled.
1624025671: └── Extended authentication not enabled.
1624025671: Opening ipv4 listen socket on port 1883.
1624025671: Opening ipv6 listen socket on port 1883.
1624025671: Opening websockets listen socket on port 1884.
1624025671: Warning: Mosquitto should not be run as root/administrator.
1624025671: mosquitto version 1.6.12 running
1624025671: New connection from 127.0.0.1 on port 1883.
1624025671: Socket error on client , disconnecting.
1624025683: New connection from 172.30.33.1 on port 1883.
1624025683: New client connected from 172.30.33.1 as mqttjs_5d76dc04 (p2, c1, k10).
1624025701: New connection from 172.30.32.1 on port 1883.
1624025701: New client connected from 172.30.32.1 as 0mF47wvBaMJu8wgZkZcaj6 (p2, c1, k60, u’homeassistant’).
1624025774: New connection from 172.30.32.2 on port 1883.
1624025774: Socket error on client , disconnecting.
1624025894: New connection from 172.30.32.2 on port 1883.
1624025894: Socket error on client , disconnecting.