I just published updated project on GitHub

It is Arduino based converter for processing Mavlink telemetry data and send them in Duplex format (Ex but also old text one) into your receiver (and down to earth)

Features :

- sending data over Ex protocol

- sending data as text to even old Jetiboxes (include messages)

- Alarms

Here is wiring, it is really simple :   Code using one hardware serial for reading telemetry from Mavlink board (ArduCopter or MegaPirateNG) and output data into Jeti as software serial.   Here is video to show Alarms https://www.youtube.com/watch?v=bKOuzuYNKlU