Until I figure out how to funnel mqtt from tailscale with auth, this is easier
Send it an a POST payload, it will transfer it to MQTT
$ docker build -t http_to_mqtt .
$ docker run -it -p 3000:3000 \
-e BIND_PORT=3000 \
-e API_KEY=foo \
-e MQTT_HOST=mosquitto.my.domain.com \
http_to_mqtt