Specifications

GV200 @Track Air Interface Protocol
TRACGV200AN003 – 108 –
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 terminal can buffer up to 720 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.
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$
3.3.6. Transparent Data Transmission
The device supports to
transparently
transfer data between the backend server and the equipment
connected to its serial port. If the equipment needs to send data to the backend server, it can send
command AT+GTDAT with the data to the serial port. The device will then wrap the data into
+RESP:GTDAT message and send it to the backend server. On the other side, if the backend
server needs to send data to the equipment, it can send command AT+GTDAT with the data to the
device and the device will pick out the pure data and send it to the serial port. Thus the equipment
can get the data from the serial port. In both directions, the data is transparent to the device.
Data to the backend server
 +RESP:GTDAT,
Example:
+RESP:GTDAT,040100,135790246811220,,data to the backend server,20090214093254,11F0$
Parameter Length(byte) Range/Format Default
Protocol Version 6
XX0000 – XXFFFF,
X∈{'A' – 'Z','0' – '9'}
Queclink
Confidential