- new command line argument to connect to other local ALSA midi ports
- UDP truncation: can be detected by using recvmsg() and watching for
  MSG_TRUNC flag. But the truncated data is usually lost, so what
  should we do in this case?
- What to do with big sysex data? What does ipMIDI do?
- https://en.wikipedia.org/wiki/RTP-MIDI
- http://www.tobias-erichsen.de/software/rtpmidi.html
- use a general file/file descriptor for midi data (OSS raw midi or serial port)
