Hi, just came across your post. I am looking at something similar. This is proabably too late for you though. Subscribe to the +WIND: 15 unsolicited response. It gives you the time information when u connect to the network over gprs(?). its a NITZ response if that means anything.
Better to respond late than never…
In our country, Vodafone bought an older operator, and they needed to rename the network. Since then we’re getting the WIND: 15 notifications 8)
One after restart, and another after a GPRS registration, with different options.
Other operators do not send anything, ever
I have done some playing about with reseting my GRPS bearer daily and I found
gets a WIND:15 response. Whether you actually want to do this is another question
at+CTZU is updated then.
Hi all, have there been any further developments in the area? Can we reliably sync the modem’s time with the network’s time? This would be particularly useful, as our modem will be scattered in various countries and timezones and using the network time would resolve the timezone issue.
Alternatively if using my one NTP server, how do I know what timezone the modem is in?
NITZ is still the only way to do this without resorting to either GPS or using an external timeserver and NTP over GPRS.
If your operator doesn’t supply NITZ information, then you’re going to have to use one of the latter options.
As far as locating your modem, you could always just keep your time across your modem fleet in UTC. Or, you’re going to need the GPS. Or maybe (if you’re lucky), you could work out the details from the PLMN information (get the operator code and the cell ID and do it from there) - similar to AGPS aiding. Could be a lot of work…
Actually, I wonder if there’s any location info in PLMN information. Might be time for a look…
Hi both, thanks for the replies. Unfortunately keeping times the same across the devices is not possible as they operate in different countries and are serviced and accessed by individuals who will expect the time to reflect their location. I guess I could do that, but I would then need to know what the timezone is so that I can adjust the time accordingly for the users.
I am now using CCED and Geolocation to track my modems (roughly). Although I think I will also implement NITZ as a comparison and alternative as I guess Geolocation will not always work / we accurate enough etc.