Homie 3 items not read properly in OH2.5M1

[xAPPO (Kevin Hawkins)]

MQTT items unreliable

openHAB 2.5.0m1 and Mosquitto on Raspberry Pi 3 Another day, another problem. So, my kitchen fan remotes didn’t work just now. This is the second time it happened – a perfectly working setup that failed on its own. I let it slide the first time but I wasn’t going to this time, so I immediately started troubleshooting. 433mhz RF – check. MCU (esp8266) – check. MQTT Explorer: Shows the correct messages on the correct topic when the remote is pressed. From that point, I use MQTT Explorer to p…

Inparticular in that thread

@David_Graeff

The MQTT Homie part is broken in openHAB 2.5m1. It has several subscribe/resubscribe issues. Fixes are merged since a few months already, but we didn’t had a release since then.

@David_Graeff

Regarding MQTT. The thing is that the underlying library (paho mqtt) is full of bugs and only maintained by one guy that only occasionally works on it and currently focuses on mqtt5. And its an eclipse project

paho would need to be replaced by that other mqtt library (forgotten the name but linked in one of the issues). That’s unfortunately a Core contribution, which I’m clearly not doing at the moment.

paho has several subscription bugs with the async API that I’m using. Most of the java people out there seem to use the synchronous API which apparently works (most of the time). I don’t see a point in working around in the mqtt binding when the actual bugs are further down in the stack.

Cheers, David

There are moves to fix this but it’s quite a bit of work I think