Specifications

GV200 @Track Air Interface Protocol
TRACGV200AN003 – 110 –
3.4. Heartbeat
Heartbeat is used to maintain the contact between the device and the backend server if
communicating via GPRS. The heartbeat package is sent to the backend server at the interval
defined by <Heartbeat interval> in AT+GTSRI command.
 +ACK:GTHBD
Example:
+ACK:GTHBD,040100,135790246811220,,20100214093254,11F0$
Parameter Length(byte) Range/Format Default
Protocol version
6
XX0000 – XXFFFF,
X∈{'A' – 'Z','0' – '9'}
Unique ID 15 IMEI
Device Name <=10 '0' – '9' 'a' – 'z' 'A' – 'Z'
Send Time 14 YYYYMMDDHHMMSS
Count Number 4 0000 – FFFF
Tail Character 1 $ $
Whenever the backend server receives a heartbeat package, it should reply an acknowledgement to
the device.
 +SACK:GTHBD
Example:
+SACK:GTHBD,040100,11F0$
Parameter Length(byte) Range/Format Default
Protocol version
6
XX0000 – XXFFFF,
X∈{'A' – 'Z','0' – '9'}
Count Number 4 0000 – FFFF
Tail Character 1 $ $
 <Count Number>: The backend server uses the <Count Number> extracted from the
heartbeat package from the device as the <Count Number> in the server acknowledgement of
the heartbeat.
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