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1. MFSK - Transfer multiple bits in a single tone using multiple frequencies (4, 16 or 256 frequencies for 2, 4 or 8 bits respectively). Uses Fourier transform to find frequency for audio signal in small windows. Write or play audio for a message using encode.py. Decode from file using decode_mfsk.py. Decode from live audio input using decode_mfsk_realtime.py. Set MFSK = True in settings.py.
2. FSK - Transfer data using only two frequencies (single bit), but at much higher rate. Write or play audio for a message using encode.py. Decode from file using decode_fsk.py. Decoding from live audio is not possible, yet. Set MFSK = False in settings.py.

sudo ip tuntap add dev tun0 mode tun user $(id -u) group $(id -g)
sudo ip link set dev tun0 up

On machine 1:

sudo ip addr replace dev tun0 local 172.30.0.1 peer 172.30.0.2

On machine 2:

sudo ip addr replace dev tun0 local 172.30.0.2 peer 172.30.0.1

Removing the adapter:

sudo ip tuntap del dev tun0 mode tun

Original MFSK code (commit e7d2e7d) by Juulpy Networking code inspired by dsptunnel by 50m30n3 (C) 2011, licensed under GPL