Specifications

GT300 @Track Air Interface Protocol
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4.4. Geo-Fence Alarm Setting
Up to 5 Geo-Fence regions can be defined on the terminal. Each Geo-Fence region is defined as a
circular region defined by a center point and radius. The terminal will report the status when it
enters or leaves one of the Geo-Fence areas.
Geo-Fence checking will only be trigged after successful GPS fixing. The <check interval>
indicates how often the terminal will check the GPS position. Prior to the first successful GPS
fixing after power on, the terminal will consider itself outside of all Geo-Fence regions. This
means that if the terminal powers on in one of the Geo-Fence regions, it will report an entering
status to the backend server. Otherwise it will not report until the Geo-Fence status changes.
The terminal will report a leaving status to the backend server if necessary when it leaves the
Geo-Fence regions. The terminal will report an entering status to the backend server if necessary
when it enters the Geo-Fence regions.
Example:
AT+GTGEO=gt300,1,121.412248,31.187891,1000,10,2,0003
“1” means Geo-Fence 1. “2” means to report an alarm message only when leaving Geo-Fence 1.
The terminal sends the following acknowledgement message:
+ACK:GTGEO,135790246811220,0003,20090202170812,000A,0102070202
The report message:
+RESP:GTGEO,135790246811220,1,1,0,1,4.3,92,70.0,1,121.354335,31.222073,2009010100000
0,0460,0000,18d8,6141,00,11F0,0102070202
The “1” indicates Geo-Fence 1; “0” means leave. The report message indicates that the terminal
has left Geo-Fence 1 and its current position is (121.354335, 31.222073).