Maybe not the right place to ask, but.....
How easy is it to put MQTT on a mobile phone to send messages?
So when things happen, it sends a message (publishes) to a known host.
I use this app (Android):
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I apologise. I am only wanting to publish to the ..... broker.
I have Tasker installed and found a plugin for it.
I have it working. Just installed it and sent a message.
On to next part of the journey!
Smart phone charging station.
You can get a pretty full blown node-red on an Android phone with Termux and Termux-API from the play strore followed by apt install o fthe node-red components.
Just something to file away for future reference if you weren't aware of it. I use it and a cheap android phone with TING "pay as you go" service to Send SMS messages via MQTT messages to by central broker.
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Works well using Node-RED on Termux, I've used it as an alternative to OwnTracks just to see if it worked, which it did and was easy to set up.
I am trying to do something similar what you did.
Can you please let me know what was the solution you found?
Things have moved on considerably over the past 30 months
I'm closing this one - please create a new thread for your problem 
