questions on how to implement the current time service

RE: questions on how to implement the current time service

Amy — Fri, 30 Jun 2017 09:40:50 GMT

Thanks, it useful. I use iOS version 10, it connects to CTS client well.

RE: questions on how to implement the current time service

zhu.ky — Tue, 06 Jun 2017 07:05:56 GMT

Hello, I faced the same situation ,do you have smartphone's time server?how to get it

RE: questions on how to implement the current time service

Valer_I — Thu, 25 May 2017 08:01:42 GMT

As far as I know the iOS has enabled CTS by default from version 10. And modern WIN10 API make it possibe to configure this service with software.

RE: questions on how to implement the current time service

endnode — Tue, 23 May 2017 09:37:26 GMT

Well I guess you need to write it on target mobile platform and load as custom app.

RE: questions on how to implement the current time service

Amy — Tue, 23 May 2017 09:17:57 GMT

Hello, I faced the same situation with Valer_I, Does anyone know how to use CTS client with the smartophone or a laptop?

Thanks.

RE: questions on how to implement the current time service

Valer_I — Thu, 02 Feb 2017 13:57:13 GMT

Hello, I tried to run CTS client example on the DK and tested with Windows 10, Android 6 and iOS 10 and in all cases I received "Current Time Service is not discovered." . After googling a while I did not find any information that CTS server ran by default at any OS I've tried. So how to use CTS client with the smartophone or a laptop?

RE: questions on how to implement the current time service

Richard — Tue, 14 Oct 2014 07:47:01 GMT

Hello,Mike, could you please share Demo exmaple of CTS? Thanks.

RE: questions on how to implement the current time service

Mike — Wed, 28 May 2014 16:33:37 GMT

Hello Kris, sorry for the late response. You can find the code here: github.com/.../nordic-semi-nRF51x-cts @ nordic: I read some question on the forum concerning the licensing and what I did should be fine. In case there is anything wrong with the licensing contact me.

RE: questions on how to implement the current time service

Kris — Fri, 09 May 2014 00:08:44 GMT

Hello Mike , Could you please share your implementation of the CTS ? Thanks , /k

RE: questions on how to implement the current time service

Mike — Tue, 01 Apr 2014 20:32:09 GMT

Thank you Ole! Yes, trough the CTS you can't set the time. But I want to enable the user to find out what time is set on the device now. And I will also implement a time client as proposed by you compensate the drift automatically once in a while. Let's see how good that will work.

RE: questions on how to implement the current time service

Ole Morten — Fri, 28 Mar 2014 10:36:14 GMT

The Time Service isn't meant to be used for setting time, it is for a Time Client to get the current time from a Time Server, without user interaction. Hence, in your case, I'd still recommend you to implement a Time Client on your device, that will request a time update from any connected Time Server.

However, to answer your questions: authorization will not affect the peer device in any noticeable way. Except for precision, there should be no problem with using a soft implementation based on the internal RTC. It will however drift quite significantly, even with a 20 ppm crytsal about 10 minutes a year, which is why I think it would make sense to have a Time Client on your device to get accurate time from a connected smart phone.

RE: questions on how to implement the current time service

Mike — Thu, 27 Mar 2014 12:18:56 GMT

Thanks for your explanations Ole,

I'm implementing a Time Server. My device needs accurate time and as it is head-less I must give an option to the user the verify, that the time is set correctly.

The advice with the "GATTS Read Request with Authorization" might suit my application. Just to confirm: Will the communication be any different from the peer devices perspective when using authorization? Just to be sure to comply with the SIG specs.

I don't like the idea of an external time keeping device as it costs money, consumes power and needs space. Do you see any problems in a soft RTC implementation based on nrf51822's RTC0/RTC1 value and/or interrupts?

RE: questions on how to implement the current time service

Ole Morten — Mon, 24 Mar 2014 10:09:40 GMT

Are you implementing the Time Server or the Time Client? I suppose the most common application would be to have the nRF51822 be a Time Client to a smart phone's Time Server, that can get the current time from GPS and/or the phone network. In this case, the nRF51822 would be a GATT Client, and reading the current time from the phone's GATT Server, to be used locally.

However, if you for some reason are implementing a Time Server on the nRF51, I'd suppose you have some external time keeping device, that you can read to get a proper time for your server. If you want to know when a characteristic is read, you can enable authorization for it, which will give you the events as shown here. Authorization can be enabled by setting the rd_auth flag in the ble_gatts_attr_md_t struct when initializing the characteristic.