121.37.58.10 is the IP of GPRS_server, 6900 is the port of GPRS
Server application.
3.3 Open GPRS function (011)
Message format:
A******,011,X
(note:x=1 open GPRS, X=0 close GPRS)
e.g. A000000,011,1
GPRS function will be open, and the device will send data to
Internet. Users can turn off this function though send SMS:
A000000,011,0
3.4 Query the GPRS Setting (004)
Message format:
A******,004
The device will send back GPRS setting parameters. You can check
whether the parameter set correctly by it.
（
1
）
Device ID
（
2
）
APN
(China Mobile is CMNET, China Unicom is UNINET)
（
3
）
Server IP address
（
4
）
Server port
（
5
）
GPRS open status
（
0- off
，
1- on
）
（
6
）
GPRS connecting status
（
0- Internet is bad
，
1- work well
）
（
7
）
GSM signal value
（
1~31
），
if it’s less than 13, the signal is too weak, and
the device can’t upload data to server automatically.
