Interesting issue popped up while integrating my setup.....
In the Ecowitt apps and local web gateway, they appear to only list the MAC for the physical network connection (cabled ethernet). I put that into the HE app, and still kept seeing the sys1 messages about no matching devices found. It was there that I noticed the oddly similar, but different MAC in that string.
If you are using Wifi for your connection with the Ecowitt gateway, you will want to copy the MAC from the SYS log or your router as opposed to the app.
Logs
App
