another test:

connected to device using /dev/rfcomm0
use the script to test connection sending a msg from 770 to device: OK
use this:
cat /dev/rfcomm0
now, i'm connected (i hear same beeps as with the previous script), but i don't see any data printed on stdout when i press generate a event on the device (if i do this with a bt gps i see nmea data)