> I have some vehicles with GPRS modems connected to O2 in the UK. The > problem I have is when the O2 "network" drops a connection to my server > - i.e. a close not initiated from the vehicle, or my server. When this > happens, I never see a disconnect, so the next time the unit reports > in, it usually has a different IP address, and I still have the > previous connection open, so I get a bit confused.
I have a similar issue with WiFi on vehicles in the UK, they drive out of range of the access points. The vehicles have GPRS as well, but we've never put SIMs in the Siemens modems. All you can do is use timeouts to close the session. I only open a connection to send data, once a minute, and have a 15 second timeout. Unfortunately this might be expensive on GRPS due to the billing (unless you have enough vehicles to get a decent price) since opening a connection is several packets, perhaps you could send a keep alive packet one a minute? Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
