To send your microphone output over a network via netcat you can do the following:

On the receiving side start to listen for the sound, decode it and play:
> netcat -l -p 3333 127.0.0.1 |opusdec --force-wav - -|aplay
On the sending side create a named pipe:
> mknod /tmp/pipi p 
Then start the recording and encoding as opus and put it into the pipe:
> arecord -f cd  |opusenc --raw --raw-rate 44100 - /tmp/pipi
In a new terminal send from the pipe to netcat:
> cat /tmp/pipi |netcat 127.0.0.1 3333

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