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Hi,
I did a quick search on the net to see what you are talking about. Seems those are GSM's with build in GPS, and programmable in Java. Right?
I cannot advice in Java, however it is possible I have to make some programs soon with Nokia 12 embedded witch is similar I think.
As network layer you can:
- setup a GPRS connection to the internet. On backoffice you have to have a fixed IP of course. There you can make a TCP server where the mobile devices connect to. Advantage is a continue online. Whilst having GPRS session the phone normally can do SMS, and can suspend it for a while if someone wants a voice call. All mobiles are reachable at same time.
- send all positions with SMS. Then at backoffice you need another phone and a server that talks with the phone. All mobiles are also reachable however with some delay which can be 1..10 seconds depending on the GSM provider.
- make a PPP Deamon on the mobile. Backoffice can then dial in to it one by one. Only 1 mobile at the time can be reached, and you need memory to store all positions until the dialup comes. Very cheap in most countries, but not real time tracking.
So purely what your application wants you have a lots of choises. I dont know of course if you can do all these things with this mobile devices.
Most of my mobile applications are with embedded phones connected to a programmable boardcomputer, so this is totally different. |