I’ve used this Aqualogic HA integration
with an Elfin-Ew11 (I’ve ordered this one on AliExpress but there are a ton of different vendor just look for Elfin Ew11)
Initially I’ve used the rs-485 to Ethernet converter but It never worked great (it’s impossible to do the timing right over Ethernet)
To setup the EW11 i’ve used the instruction from Mark on this google drive