I was looking for something along those lines for myself and found a 12v 2 channel arduino relay online at the link below , It has a jumper for high or low level trigger with a trigger current of 5mA
there are 4 ,8, and 12 way boards also if you need more outputs
https://www.ebay.co.uk/itm/DC-12V-2-Channel-Relay-Module-with-Optocoupler-H-L-Level-Triger-for-Arduino-E1W9/123316846044?epid=2215872635&hash=item1cb641bddc:g:TrwAAOSwAwtbdrUF
Hi Galaxy Guy , I have a flex 50 v 3.37 with an EO83-001 ethernet module fitted , the Honeywell GX app is working fine ,I have tried to connect with your self mon app but it connects for around 15 seconds then disconnects after 2 or 3 attempts it shows Login Failed , any ideas ?