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Parameters: On/Off, and interval / retry times. In order to keep connection in GPRS
network, the unit can be set to send short keep alive report to the server in order to prevent
the disconnection from the mobile service provider.
Send reports after a successful keep alive ACK. Parameters: On/Off.
If you select this function, all the reports will only be sent out after a successful keep alive
ACK. (So if your keep alive time is shorter then select this function will be OK.) This
function is very useful while using UDP to prevent report lost.
Send a keep alive packet right before due reports if no data stream within certain time:
Parameters: On/Off and idle time.
Some GSM provider might cut connection, if there is no data within certain time. It might
result report lost in this “fake connection” duration. For example, you can set parameters in
this region, ex 20 mins. (It means if the unit did not send any data in this 20 mins (including
keep alive or normal reports), then it will send a keep alive packet to check if the GPRS
connection is valid or not. If not, it will actively reconnect to GPRS network.
Special command for SMS mode:
If the GT3600 is not in the GPRS online status, user can send command &&Y02 or
&&Y04 to ask unit to connect to server. This command can be sent from any device via
SMS;
&&Y02:
When received this command, system will actively try to connect to server in next 600
seconds.
&&Y04,[connection time],[report interval]:
For example: &&Y04, 3600, 60
When received this command, system will connect to server in the next 3600
seconds, and send one report out every 60 seconds.
