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GMT00 @Track Air Interface Protocol

TRACGMT100AN001 – 106 –

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,080100,135790246811220,,20100214093254,11F0$

Parameter

Length(byte)

Range/Format

Default

Protocol version

XX0000 – XXFFFF,

X∈{'A' – 'Z','0' – '9'}

Unique ID

IMEI

Device Name

<=10

'0' – '9' 'a' – 'z' 'A' – 'Z'

Send Time

YYYYMMDDHHMMSS

Count Number

0000 – FFFF

Tail Character

Whenever the backend server receives a heartbeat package, it should reply an acknowledgement to

the device.

 +SACK:GTHBD

Example:

+SACK:GTHBD,080100,11F0$

+SACK:GTHBD,,11F0$

Parameter

Length(byte)

Range/Format

Default

Protocol version

XX0000 – XXFFFF,

X∈{'A' – 'Z','0' – '9'}

Count Number

0000 – FFFF

Tail Character

 <Protocol Version>: The device type and the protocol version that the backend server

supported. This field is optional. The backend server could just send an empty field to

decrease the length of the heartbeat data acknowledgement.

 <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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