Hi @sweetpi
If i understand well you are working on a esp8266, is it to play the role of a repeater for RF messages or a node to collect data and send to pimatic over wifi?
Currently i am using pimatic to monitor my gas and electricity consumption + generic protocol to send those values to pimatic : this solution works fine (and reliable). But there are some cons : realtime consumption is not very accurate (realtime means 5 mins actually) and it create a lot of RF traffic that block some other communication.

Right now i have a free nano and esp8266 module, so if you need that i perform some tests : i can.

Thanks
Yves