Sierra Wireless WISMO218 User Manual download pdf (Page 29)

WA_DEV_W228_UGD_002 Rev 003 Page 29 of 78

WISMO228 TCP/IP AT Commands

Manual

4. IP Protocol Services

Service Creation +WIPCREATE

Description

The +WIPCREATE command is used to create UDP, TCP client and TCP server sockets associated

with the specified index.

If a local port is specified while creating a socket, the created socket will be assigned to this port; if

not, a port will be assigned dynamically by the firmware application. If peer IP and peer port is

specified, the created socket will be connected to the specified IP and port.

The TCP server cannot be used to transfer data. To transfer data, it creates a local TCP client socket.



using spawning, the socket passively listens on a specified port for incoming connections. The

diagram below shows the different states managed for a TCP server.

On reception of a connection request from a remote client socket, a server socket does the following:

 spawns a new socket (client) to connect to the remote socket

 transfers data between the spawned socket and the remote socket

 remains in listening mode and is ready to accept requests from other clients

The diagram below shows the connection establishment procedure.

Closed

Listen

Server Socket

Create

Server listening to the

remote socket for connect

request

Close Server

Socket channel

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Sierra Wireless WISMO218 User Manual Page 29