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GMT00 @Track Air Interface Protocol

TRACGMT100AN001 – 104 –

3.3.5. Buffer Report

If the buffer report function is enabled by command AT+GTSRI, the terminal will save the report

messages in a local buffer when the following occurs.

 GSM network is not available

 Failed to activate GPRS context for the TCP or UDP connection.

 Failed to establish the TCP connection with the backend server.

These messages will be sent to the backend server when connection to the server recovers again.

The buffer reports are saved to the built-in non-volatile memory in case the device is reset. The

terminal can buffer up to 3000 messages (160 bytes per message).

Detailed information about buffer report is listed below.

 Only +RESP messages are buffered except that +RESP:GTALL is not buffered

 In the buffer report, the original header string “+RESP” is replaced by “+BUFF” while keeps

the other content untouched including the original sending time and count number.

 Buffered messages will be sent only via GPRS by TCP or UDP protocol. They cannot be sent

via SMS. If the current report mode is forcing on SMS, the buffered messages will be sent

via TCP short connection.

 The buffered messages will be sent after the other normal messages sending if <Buffer

Mode> in AT+GTSRI is set to 1.

 The buffered messages will be sent before the other normal messages sending if <Buffer

Mode> in AT+GTSRI is set to 2. The SOS message has the highest priority and is sent

before the buffered messages.

Example:

The following is an example of the buffered message:

+BUFF:GTFRI,020100,135790246811220,,0,0,1,1,4.3,92,70.0,121.354335,31.222073,200902140

13254,0460,0000,18d8,6141,00,,20090214093254,11F0$

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