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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) 147

Scenario 2 – Setting up UDP Sessions and IP

Module Acting as Server

Start a Listen Socket in the IP Module and wait for incoming requests to connect. In this case, the socket will latch on

to the first client from which the data is read from and can further be used to send data to and receive data from only

that client.

Command

socket udp 0.0.0.0 0 <local_port>

The <remote_ip> and <remote_port> parameters are specified as 0.0.0.0 and 0 respectively for the udp listen

socket. The <local_port> parameter is mandatory for listen socket.

Example

Start a UDP listen socket on ip-module i.

#socket udp 0.0.0.0 0 3000

<4>

#socket listall

No TCP connect sockets

No TCP listen sockets

UDP sockets

SockHandle SockType RemoteIP RemotePort LocalIP LocalPort

4 UDP listen 0.0.0.0 0 192.168.1.144 3000

Now, when i receives data from A, the UDP socket <4> latches itself to A.

#socket recv 4

data

--- 4 bytes read ---

#socket listall

No TCP connect sockets

No TCP listen sockets

UDP sockets

SockHandle SockType RemoteIP RemotePort LocalIP LocalPort

4 UDP socket 192.168.1.120 2000 192.168.1.144 3000

Any further send on socket <4> will result in sending data to A.

If B sends data to i on port 3000, socket <4> will not accept it, since it is latched to A and is listening only to

A. Thus, in order to receive data from or send data to B, you'll have to create another UDP listen socket on a

different port number.

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Multitech MultiConnect Adapter Guía de usuario Pagina 147