On 11/11/2014 21:52, Tom Harris wrote:
How are you getting time from the GSM network? If you are using the NITZ
(look it up) service then you can use an unactivated SIM for free, but the
accuracy is woeful, it can be seconds out.
I'm not at the moment; mobile phones do set their clocks from the
network but I've no idea how accurately it can be done - which is why I
was asking.
Else you will have to have a live SIM and use NTP to a server. If you make
any progress please post to the list. I have not heard of being able to
access the clock in the tower over the network.
The beauty of phone network is that it works in buildings, where GPS does
not reach.
Tom Harris <[email protected]>
I would have a live SIM as the modem would be used periodically (but not
necessarily frequently - perhaps every 24 hours or more) to send data. I
would not want to use an NTP service as I would only have a
micro-controller with limited memory.
Tony H
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