I use the 'Output' value; the output is either a 0 or a 1 (a number value), if you connect that to a true or false (a boolean value) it causes 0 = false and 1 = true
From what I understand of TouchOSC Bridge, TouchOSC sends MIDI over the network (maybe using OSC or UDP) to the computer running TouchOSC Bridge, and Bridge forwards these Midi messages via virtual Midi ports it installs. So the whole process is done without OSC, it is a wireless MIDI setup, receiving MIDI means you have it working.