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TIBCO Rendezvous® 8.7.0

# Understand Sockets

Transport creation calls accept two parameters that direct the transport to open two different kinds of sockets:

| • | The `service` parameter specifies a UDP service (also commonly called a UDP port); the transport opens a UDP socket to that network service.

Rendezvous daemon processes uses the UDP service for communication with other Rendezvous daemon processes across the network.

| • | The `daemon` parameter specifies a TCP port number; the transport opens a TCP socket to that port.

Transport objects use the TCP port for communication between a client program and its Rendezvous daemon (usually on the same host computer).

This parameter corresponds to the `-listen` parameter of `rvd`.

These two types of socket are not interchangeable; confusing the two leads to programming errors that are difficult to diagnose and repair.

One source of this confusion is that the default `rendezvous` service (for TRDP daemons) is UDP service `7500`, and the default `daemon` parameter is TCP socket `7500`. Although these two numbers are the same, they specify different items.

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