Sierra Wireless WISMO218 User Manual download pdf (Page 43)

WA_DEV_W228_UGD_002 Rev 003 Page 43 of 78

WISMO228 TCP/IP AT Commands

Manual

5. Data Exchange for Protocol

Services

This section deals with the data exchange for the services over TCP/IP. All the commands required for

the data exchange through different services are mentioned in succeeding sections.

Socket Data Exchange +WIPDATA

Description

The +WIPDATA command is used to read/write from/to a socket. On successful execution of the

command, the UART switches to data mode. The UART can be switched back to AT mode by sending

nce. If data is not read using +WIPDATA

command, further data will be delayed.

An unsolicited event is received when there is data to read on a socket.

Data can be sent on the sockets using two modes:

 continuous mode

 continuous transparent mode

Continuous Mode

TCP Sockets in Continuous Mode

In continuous mode, an [ETX] character is considered as an end of data. When an [ETX] character is

sent on the UART, the TCP socket is shutdown and the peer side is informed of this shutdown with

[CR][L.

In case an [ETX]/[DLE] character needs to be transmitted as data, it should be preceded by a [DLE]

character. Similarly, [ETX]/[DLE] characters received by the TCP/IP stack from the internet are sent to

the host through the serial port preceded by a [DLE] character.

To close sockets, switch the UART to AT command mode and use the +WIPCLOSE command.

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Sierra Wireless WISMO218 User Manual Page 43