In TouchOSC, turn on the log (View-->Toggle Log on macOS). Select the MIDI tab. When you move the on-screen knobs, you should see "SEND" messages in the log. When you move one of the pedal's knobs, you should see "RECEIVE" messages in the log.
If TouchOSC is not able to communicate with the pedal after a firmware update, try going to the TouchOSC Connection dialog (link button) and re-selecting the pedal.