Question

I want to pull data from a device that is accessed via a serial protocol and has a GPRS modem attached which should allow transparent access over an IP connection. It seems to me that this approach is upside down, because how should I know at which IP address the device currently is? Unfortunately, the device itself is rather dumb, so I can t make it send something to my server, which would reveal the current IP.

For home routers on dialup lines, there s dynamic DNS services. Is there something equivalent in the mobile world? Each modem would, of course, have its phone number as a reliable address, but how does that help me?

Practically all material on GPRS etc. that I can find online seems to be concerned with initiating the connection from the modem side, since that s what the system is designed for.

Answer 1

You re right, typically the GPRS device has to initiate the connection, since they are not usually assigned static IP addresses.

I would suggest looking again at the device, because it certainly should have a way of initiating a connection with a remote server (you will probably need to directly connect it to a PC to initially configure it). I ve worked with quite a few different GPRS devices, and they all worked this way.

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