1. consume ITTY
mkfifo fifo.wav
curl http://internet-tty.net:8000/ITTY --output - | ffmpeg -i pipe:0 -f wav -ar 11025 pipe:1 > fifo.wav
2. Decode RTTY data to a file
minimodem rtty -a -5 -i --file ./fifo.wav > data.txt
mkfifo fifo.wav
ffmpeg -y -i http://internet-tty.net:8000/ITTY -r 8 -preset ultrafast -fflags nobuffer fifo.wav
minimodem rtty -a -5 -i --file ./fifo.wav | netcat -l 4080 -
nc localhost 4080