man ser2net says that by running ser2net with a -p flag I can execute a number of commands. If I run ser2net -p 12345 and, then, lsof -i :12345, I can see the service on that port. How would I, for example, send the command showport to ser2net?



The ser2net control port is mapped to TCP port 12345 on the device running ser2net. Open a telnet session to that port from another device on the network that can see it. Assuming that the IP of your device is, something like this would work:

telnet 12345
-> showport
TCP Port 4000
  enable state: telnet
  timeout: 0

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