Multitech MultiConnect Adapter Betriebsanweisung PDF herunterladen (Seite 149)

Chapter 15 – Raw TCP/UDP Socket Interface to the Serial Device

Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 149

Scenario 4 – Setting up TCP Sessions and IP

Module Acting as Server

Start a TCP server to keep listening on a particular port. When a connection is accepted from a remote host, a socket

handle is created. This can be used to send and receive data to and from that remote host.

Command

socket tcplisten <local_port> [backlog]

Example

The tcplisten command on success returns a server socket handle.

#socket tcplisten 3000

Tcp Listen socket handle 4

This doesn't create any listen sockets. The listen sockets are created when a remote host tries to connect to the IP

Module and the connections are accepted by IP Module.

#socket listlisten

Tcp Server Handle: 4

Local Port: 3000

Backlog: 10

No TCP listen sockets

After accepting connections from remote hosts the sockets list is updated.

#socket listlisten

Tcp Server Handle: 4

Local Port: 3000

Backlog: 10

SockHandle SockType RemoteIP RemotePort LocalIP LocalPort

5 TCP listen 192.168.1.120 3072 192.168.1.144 3000

Notes

1. Tcplisten with backlog allows you to limit the number of connections to a TCP server by specifying the

backlog parameter. By default the backlog is 10.

2. We can issue any socket command any time depending on the requirement.

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Multitech MultiConnect Adapter Betriebsanweisung Seite 149