[time-nuts] time sync from cellphone TO microcomputer

Attila Kinali attila at kinali.ch
Sun Nov 22 08:28:51 EST 2015

On Sun, 22 Nov 2015 11:08:50 +0200
Esa Heikkinen <tn1ajb at nic.fi> wrote:

> > While this is trivial with a GPS receiver, we were thinking about a very 
> > minimalist implementation, with a smart phone as the control interface.
> Forget the smart phone - at least if it's un-rooted Android. I'm not 
> sure how the default time sync is done, it's either by Google servers 
> (which are famous of their non-standard way to handle leap seconds) or 
> NITZ protocol from cellular network. Either way the time quality is very 
> poor. It may be off even tens of seconds and usually it's off at least 
> couple of seconds at most of the time.

This only means you cannot rely on the system clock to be reliable.
It doesn't mean the application cannot get its own clock by some
means (ntp and gps come to mind) and use that as synchronization master.

			Attila Kinali

Reading can seriously damage your ignorance.
		-- unknown

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