Thanks for the report. The Retevis Ailunce HA2 isn’t supported in RadioMail. I don’t have one, so I can’t tell whether what you’re seeing is on the RadioMail side or in the radio’s KISS TNC implementation.
I’ve reached out to Retevis several times about an evaluation unit so I could test it properly, but they never followed through. If you’d like to see the HA2 supported, letting Retevis know you want it working with RadioMail may help.
Detected and supported are two different things. Retevis added BLE service advertising, so any app looking for a KISS TNC will find the HA2. Whether its TNC can actually handle a packet connection is another question entirely.
The early video of it doing APRS was less than stellar, and APRS is the easy case: single frames, sent once with no acknowledgment. Winlink uses connected packet sessions, which are much more demanding, so no one should assume they’ll work.
That’s why getting these radios into developers’ hands matters. So far, they all seem to be going to “YouTube influencers” instead.