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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) 145

Chapter 15 – Raw TCP/UDP Socket

Interface to the Serial Device

Introduction

The serial/host device can use the IP Module Raw TCP or UDP socket interface to work with multiple servers with

proprietary protocols between the device and the remote servers.

Features

• Opens RAW TCP sockets and establishes TCP sessions to any TCP server running on any port.

• Opens, connect s, and binds UDP sockets.

• Opens a TCP listen socket on any configured port.

• Maintains the socket status and sessions and list the socket status upon request from the device.

• Closes the specified socket or all the sockets, which was/were opened previously.

• Transmits or receives data of a specified size on any previously opened socket.

• Flushes data in the socket buffer of any previously opened socket at any time.

• Supports multiple TCP sockets, UDP sockets, TCP listen sockets respectively.

Important Notes

• This application is applicable only in the IP module in non-transparent mode.

• This application can be used only after the PPP link is UP with an IP Address on the modem port. (Refer

to the Prerequisites chapter - Physical Link Establishment for more details)

• In the event of PPP link DOWN, the RAW Socket request triggers PPP link establishment.

Only these commands trigger the PPP link, if link is DOWN:

socket tcp <remote-ip> <remote-port>

socket udp <remote-ip> <remote-port> <local-port>

Commands to Access the RAW TCP and UDP Socket Interface

The host/serial device can use the following commands to work on the sockets to send/ receive data to/from a remote

server depending on the requirements.

Syntax

socket close <socket-handle>

socket closeall

socket flush <socket-handle>

socket flushall

socket listall [-s] [-d]

socket listlisten [-s] [-d]

socket recv [-s <max-size>] <socket-handle>

socket send <[-s <max-size>] [-d <delim>]> [-m <MTU>] <socket-handle>

socket stat [-s] [-d]

socket tcp <remote-ip> <remote-port>

socket tcplisten <local-port> [backlog]

socket udp <remote-ip> <remote-port> <local-port>

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Multitech MultiConnect Adapter Betriebsanweisung Seite 145