I've done the rounds with Sonoff DW1 RF, DW2 RF and DW2 WiFi. The latter working now (after latest firmware upgrade) with eWeLink, but still a problem in HA. I've finally found a working sensor with Eachen DW2 RF that has both on & off states which I've linked to my Sonoff RF bridge. One bridge will only handle 2 sensors (on & off x 2). This is where I got them: https://eiferer.co.za/collections/e...-2-codes-433mhz-rf-dw2?variant=31541279096880
Good find, thanks for the switches!
Note that if you flash the bridge, you can support unlimited devices. No idea why eWeLink has that limit.