Queclink GL300 User Manual

GL300 @Tracker Air Interface Protocol
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+GTQSS or AT+GTSRI command.
 +ACK:GTHBD:
Example:
+ACK:GTHBD,1A0102,135790246811220,,20100214093254,11F0$
Parameter Length (byte) Range/Format Default
Protocol version 6 XX0000 – XXFFFF,
X∈{'A'-'Z','0'-'9'}
Unique ID 15 IMEI
Device name 20
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,1A0102,11F0$
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.
3.5. Sever Acknowledgement
If server acknowledgement is enabled by AT+GTQSS or AT+GTSRI command, the backend
server should reply to the device whenever it receives a message from the device.
 +SACK:
Example:
+SACK:11F0$
Parameter Length (byte) Range/Format Default
TRACGL300AN001 - 85 -
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Queclink GL300 Specifications

General

Brand	Queclink
Model	GL300
Category	GPS
Language	English