Specifying a Local Daemon
Specify the daemon’s client socket as a character string with components separated by colons.
For local daemons, specify the transport creation function‘s daemon parameter and the ‑listen option to the daemon process as a (TCP) socket number; for example: "6555"
To use the default client socket, supply NULL as the daemon argument to the transport creation function, and omit the ‑listen option to the daemon process.