Multitech MMCModem GPRS (MTMMC-G) Manual de usuario descargar pdf (Pagina 28)

Chapter 4 – Data Exchange for Protocol Services

Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437C) 28

Socket Data Exchange +WIPDATA Continued

Leaving Continuous /Continuous Transparent Mode

The UART can be switched back to AT mode:

• By sending “+++” with 1 second guard time before and after the sequence

• By sending an AT+WIPDATA=<proto.,<index>,0 on another UART in AT mode

When the UART leaves data mode either because of “+++” escape sequence or because of an

unmapping done on another UART, the currently unsent data are sent as a single datagram.

Resetting TCP Sockets

A TCP socket is reset when the connection is aborted due to an error on the socket. When the

socket is reset, an [EXT] character is sent on the mapped UART to indicate the end of

communication. The mapped UART switches to AT mode and "CME ERROR:843" is displayed on

the UART.

Syntax: AT+WIPDATA=<protocol>,<idx>,<mode>

Read Command: AT+WIPDATA? Displays the current values.

Test Command: AT+WIPDATA=? Displays the available values.

Unsolicited Response: If <protocol>=1 +WIPDATA: <protocol>,<idx>,<datagram size>,<peer

IP>,<peer port>

If <protocol>=2 +WIPDATA: <protocol>,<idx>,<number of readable

bytes>

Caution: The value returned by <number of readable bytes> indicates that

there is some TCP data ready to be read but number of bytes

returned might not be reliable.

Parameters/Defined Values:

<protocol>: socket type

1 UDP

2 TCP client

<idx>: socket identifier

<mode>: mode of operation

0 unmap: switch the UART (mapped to continuous mode) to AT

mode.

1 continuous: switch the UART

to data mode.

2 continuous transparent: switch the UART

to data mode. In this

mode,[DLE]/[ETX] characters are considered as normal data and

not special characters.

Parameter Storage: None

Possible Errors:

“+CMEE” AT error code Description

851 bad state

837 bad protocol

843 connection reset by peer

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 43 44

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