Does nobody here remember modems? You take an old 2400 baud modem that's supposed to work over a crackly telephone line - www.engadget.com/media/2009/05/090527-300baud-01.jpg
that's literally how TCP/IP was invented. This stuff - pure, analog audio - went all the way up to 28.8kbps, which was the limit of the line bandwidth. Why not just take those protocols and put them into a speaker and microphone. Why bother writing new protocols? Just start with modem protocols and play with the frequencies.
Home Internet connectivity was literally born out of TCP/IP over audio...
that's literally how TCP/IP was invented. This stuff - pure, analog audio - went all the way up to 28.8kbps, which was the limit of the line bandwidth. Why not just take those protocols and put them into a speaker and microphone. Why bother writing new protocols? Just start with modem protocols and play with the frequencies.
Home Internet connectivity was literally born out of TCP/IP over audio...