Currently, they use two different technologies:
- from the PC to the tablet, UDP is used. If the map is working and the instruments are moving, you have this bit working. Nice.
- from the tablet to the PC, telnet is used. It is used in the radio panel, the different switches of the instrument panel and in some other places. The tablet must be aware of the network address of your PC. You have to set the network address of your PC in the settings menu of FlightGearMap (in the tablet). I believe that you have not performed this step