Sierra Wireless WISMO218 User Manual download pdf (Page 46)

WA_DEV_W228_UGD_002 Rev 003 Page 46 of 78

WISMO228 TCP/IP AT Commands

Manual

 UDP socket: a non escaped [ETX] signals the boundary of the current received datagram.

 TCP socket: a non escaped [ETX] signals that the peer TCP connected to the TCP unit has

shutdown (through the downlink way). Desktop PC1 should then close the uplink socket to

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Protocol

UART

IP Network (active socket)

UDP

Data containing a [DLE][ETX] sequence.

Data containing an [ETX].

UDP

[ETX] alone.

Mark the boundary of the UDP Datagram

received/to be transmitted.

TCP

Data containing a [DLE][ETX] sequence.

Data containing an [ETX].

TCP

[ETX] alone.

Causes/signals a shutdown operation on TCP

socket.

Note: The behaviour is symmetrical in the sense that it applies both on the transmitting and the receiving side

of the UART.

[DLE] Escaping Mechanism

A [DLE] character will be sent as data only when it is preceded by another [DLE] character. A single

[DLE] character which is not preceded by a [DLE] character will not be transmitted.

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Sierra Wireless WISMO218 User Manual Page 46