Add MQTT notification

[thennart]

Be able to notify to MQTT queue

[louislam]

apprise maybe supports in the future.

Related request: caronc/apprise#388

[louislam]

Just check again, MQTT has been supported by apprise.

https://github.com/caronc/apprise/releases/tag/v0.9.5.1

However, you need to install a library, so I believe it can be done for non-Docker users only.

pip install paho-mqtt

[gaby]

You could also build your own Docker image via:

debian:

FROM louislam/uptime-kuma:1-debian

RUN pip3 install --no-cache-dir paho-mqtt

alpine:

FROM louislam/uptime-kuma:1-alpine

RUN pip3 install --no-cache-dir paho-mqtt

[southseaboy]

thanks @gaby - nb for 1.9.1 release on debian I also needed to install wheel and setuptools prior to paho-mqtt. I'm guessing some change in the debian buster image used.

FROM louislam/uptime-kuma:1-debian

RUN pip3 install --upgrade --no-cache-dir wheel setuptools

RUN pip3 install --no-cache-dir paho-mqtt