Here's a quick demonstration of me using the radio messenger. I have one messenger connected to Signal and one not. Both boards are plugged into the same computer.

Using with Signal

To use with Signal, start by opening two terminal windows and navigating to the folder you're storing client.py and signal_reader.py in.

run python3 signal reader.py

Send yourself a message to verify it's working correctly, it should show up in a few seconds.

Using without Signal

If you did not do the previous step, simply open a terminal window and navigate to where client.py is stored. You do not need to run signal_reader.py.

Starting the messenger

Now, run python3 client.py

You'll see an option for the port, type which number the port is (on Linux if you only have one device plugged in, just typing in 0 and pressing enter should work).

Choose if you want to enable signal (1 for yes 0 for no) or not and then press enter.

A window should now pop up and the test message you sent earlier (if you enabled signal) should appear.

Now, copy the newly created secret.key over to your recipient and you should be good to go!