Specifications

GT300 @Track Air Interface Protocol
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4.2.4 Location by Call
The device supports to report its location by a phone call. The location by call function has total
four working modes. According to the working mode, the device will use different reporting
format and different destination to send its current position.
Example 1:
The working mode 1: under this working mode, the device will report its current location to the
backend server by message +RESP:GTLBC when there is an incoming call. The report
message will be sent according to the setting of <report mode>.
AT+GTBEI=gt300,,,1,80,2,0,10,116.228.221.61
,7003,,,1,0001
In the message +RESP:GTLBC will include the phone number of the incoming call to let the
backend server process the response accordingly.
+RESP:GTLBC,135790246811220,13888888888,1,4.3,92,70.0,1,121.354335,31.222073,200901
01000000,0460,0000,18d8,6141,00,11F0,0102070202
Example 2:
The working mode 2: under this working mode, when there is an incoming call, the device will
first try to find it in the local phone book. If there is a match, the device then reports its current
location to the incoming call number via SMS with a Google Maps hyperlink. No match found,
no report.
AT+GTBEI=gt300,,,2,80,2,0,10,116.228.221.61
,7003,,,1,0001
In the response SMS message, besides a Google Maps hyperlink to the current position, it also
report whether it is a successful fix, the UTC time from the GPS chip and the current battery level.
http://maps.google.com/maps?q=31.222073,121.354335
F1 D2009/01/01T00:00:00 B74%
http://maps.google.com/maps?q=31.222073,121.354335 is the hyperlink to the current location
in Google Maps.
F1 indicates it is a successful fix while F0 will be fail-to-fix.
D2009/01/01T00:00:00 is the UTC time when obtaining the position information.
B74% indicates that the battery level is 74%.
Example 3:
The working mode 3: under this working mode, when there is an incoming call, the device will not
check the source of the incoming call. It will send its current location to each incoming call
number via SMS with a Google Maps hyperlink. AT+GTBEI=gt300,,,3,80,2,0,10,116.228.221.61
,7003,,,1,0001
The response is same as working mode 2.
http://maps.google.com/maps?q=31.222073,121.354335