I was playing with the ersky9x r219c BT (HC-06) and FRrSky Dashboard mobile app latest version. There seems inconsistent data from Tx to the app.
I will put all the finding and keep updating here, many variable/data points.
When you are done with Mavlink (which is more important than this
![Wink ;)](./images/smilies/icon_e_wink.gif)
The correct ones (matching telemetry display screen):
Rssi, Tssi, Cell1, Cell2, Cell3
The incorrect ones (not matching telemetry display screen) (1st number is what shown on display, 2nd number is what shown on the Dashboard):
Atl: -0.2 -32.3 (this I believe is the Alt before 'zero Alt', the display should match the BT data)
RPM: 810 1620 (exactly 2x the displayed rpm)
A1: 5.5v 107.0v
A2: 12.5v 162.0v
AccX: 64 0
AccY: -64 0
AccZ: 1024 1