Hey Simon,
Sorry not replied sooner, I didnt get a notification for this for some reason.
Anyway, I am in NZ and still trying to fully integrate this into HA. We do use the M2 gateway and the outdoor gateway but they appear very different in setup. I have had some assistance from Seeed support and they confirm this and said the integration is based on the M2 platform.
So I have that working, with the integration and trackers etc but am now struggling to get the button press working. This seems to use a switch case and send any one of 8 events but using the SOS event entity.
Separating those is what is now doing my head in, discussed a bit on this thread
https://community.home-assistant.io/t/json-data-extraction-from-lorwan-mqtt-gateway/670735/25
If you want to ask any questions about the HA side of things, fire away but I am no coding wizard…