Specifications

GT300 @Track Air Interface Protocol
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3.4. Heart Beat Data
The heart beat data is sent from the terminal to the backend server in order to maintain the
long-connection of TCP.
¾ AT+GTHBD=
Example:
AT+GTHBD=HeartBeat,135790246811220,20090101000000,11F0,0102070202
Parameter
Length(byte)
Range/Format
Default
content
9
HeartBeat
unique ID
15
IMEI
send time
14
YYYYMMDDHHMMSS
count num
4
ver
10
HHHHSSPPPP
— <content>: string “HeartBeat”.
The backend server SHOULD respond with:
¾ +RESP:GTHBD,
Example:
+RESP:GTHBD,GPRS ACTIVE,HeartBeat,135790246811220,20090101000000,11F0
Parameter
Length(byte)
Range/Format
Default
content1
11
GPRS ACTIVE
content2
9
HeartBeat
unique ID
15
IMEI
send time
14
YYYYMMDDHHMMSS
count num
4
— <content1>: string “GPRS ACTIVE”.
— <content2>: string “HeartBeat”.