Legendary reply - thank you! I know Ansible very well. As fun as it will be to get into the detail of OpenHAB, we’re looking at a fairly straightforward template we can use for multiple OpenHABian devices and generally work upstream. The battle is to get the boxes reporting their data and receiving commands.
It seems https://github.com/mp911de/logstash-gelf/ can connect log4j2 to Graylog and Seq, but there’s no native appender for the latter: https://docs.datalust.co/discuss/577edbb1c6a4f00e0052de58
I’ve found Z-Wave on HUSZB is generally OK. But the Zigbee just won’t work. It’s stubborn about how it won’t work on OpenHABian. It’s ugly and slightly prone to being knocked over with that thing sticking out of it. That said, I’m now on our second Razberry because the first has exhausted all avenues to work other than a hardware fault. What i’d love is a component shield for the v4 Pi which did what the USSZB does, right out of the box without needing configuration.
In terms of MQTT, i’m having a bit of trouble configuring a local Pi to replicate SmartThings’ webhook events (post i added was here Logging changes/events to remote MQTT server). The trick is to get the 20 boxes sending up their activity onto the cloud server so a bunch of other things to subscribe to the data stream. Then we have a MongoDB cluster, load-balanced web app to read from it, and a Centrifugo server (https://github.com/centrifugal/centrifugo) and REST API to talk to API clients. The part which is proving difficult is connecting these things together to ensure scalability as we go.
HiveMQ looks good for joint brokerage and storage, but there’s no MongoDB plugin openly available yet for cloud persistence. And there’s no reliable FOSS CLI tool i can find to subscribe to the MQTT channels and forward them as HTTP POST payloads to a web app (mosquitto_sub + curl is a no-go because of the concurrency).
Another concern i have is breaking changes in versioning. Is there a release date for the stable branch of OH3? It looks good, but i’m wondering about the overhead of re-flashing a bunch of Pi boxes to something new.