Specifications

GT300 @Track Air Interface Protocol
- 37 -
terminal will try to connect again.
— The terminal checks the connection status by heartbeat data. (For heartbeat, please refer to
chapter 3.4). The terminal will send the AT+GTHBD special command to the backend server
every specified period of time. The backend server will reply with the message
+RESP:GTHBD. If the terminal cannot receive this message from the backend server, the
connection will be considered as dropped.
— In this mode, the terminal does not attempt to connect to the secondary server or SMS
gateway even though the main server cannot be accessed successfully.
Example:
The following command is used: AT+GTSRI=gt300,2,cmnet,,,116.228.221.61
,7001,+7911888888,0000
Please note that the boldfaced “2” means “TCP long connection mode”.
After the terminal receives the configuration command successfully, it will give the following
acknowledgement message:
+ACK:GTSRI,135790246811220,0000,20090112104725,000A,0102070202
¾ UDP Mode
— Set <report mode> as 3 by the AT+GTSRI command.
— The terminal sends all messages via UDP protocol.
Example:
The following is an example for configuration: AT+GTSRI=gt300,3,cmnet,,,116.228.221.61
,7001,+7911888888,0000
Please note that the boldfaced “3” means “UDP mode”
The configuration is done when the backend server receives the following message:
+ACK:GTSRI,135790246811220,0000,20090112104725,000a,0102070202
¾ Force on SMS Mode
— Set the <report mode> as 4 using the AT+GTSRI command.
— All of the messages are sent by SMS in this mode except when the “Fixed timing report” is in
“emergency mode” in which case the report message will be sent by TCP.
— Due to the limited length of SMS, the report messages +RESP:GTALL will be sent via TCP
short connection..
Example:
Configure the terminal with the command: AT+GTSRI=gt300,4,cmnet,,,116.228.221.61
,7001,+7911888888,0000