[time-nuts] Lowest Power NTP Server

[Bob kb8tq]

Hi

My target is “a couple of mili seconds” so a microsecond or five is sort of a non-issue. 

The whole thing will run over (slow) WiFi. That puts a whole other layer of delay
on top of things. Holding nanoseconds or microseconds with that sort of overhead 
seemed to be a bit much. 

What I’m doing will be quite happy if the results are typically (=90%)  < 10 ms. 

Bob

> On Dec 1, 2019, at 4:27 PM, Didier Juges <shalimr9 at gmail.com> wrote:
> 
> This article indicates: " Average precision was measured (by comparison to
> known-good time sources) with 1 ms, or 0.001 seconds "
> 
> On Sun, Dec 1, 2019 at 2:01 PM David <david at mju.io> wrote:
> 
>> I'd think one of the ESP32's would be a fine choice. They have some good
>> power management options to wake up periodically to do the work, making for
>> even lower power consumption.
>> 
>> Looks like someone has already written some code that could be adapted?
>> 
>> https://github.com/DennisSc/PPS-ntp-server/blob/master/README.md
>> 
>> -David
>> 
>> -------- Original Message --------
>> On Dec 1, 2019, 09:49, Bob kb8tq wrote:
>> 
>>> Hi
>>> 
>>> So something like one of the many ESP32 based boards?
>>> 
>>> Of course when it comes to the “code from scratch” part there is the
>> problem that I’m
>>> pretty (most would say very …) lazy :) :) :)
>>> 
>>> Bob
>>> 
>>>> On Dec 1, 2019, at 12:29 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>
>> wrote:
>>>> 
>>>> --------
>>>> 
>>>> You can do better than RPi, since a NTP server basically
>>>> only needs to understand two packets: IP/UDP at port 123
>>>> and ARP packets.
>>>> 
>>>> There are WiFi enabled microcontrollers that could be taught how
>>>> to do that, but you'd have to write up your NTP daemon from scratch
>>>> which is not hard when you do not have to do the "sync clock from
>>>> remote servers" part.
>>>> 
>>>> 
>>>> --
>>>> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
>>>> phk at FreeBSD.ORG | TCP/IP since RFC 956
>>>> FreeBSD committer | BSD since 4.3-tahoe
>>>> Never attribute to malice what can adequately be explained by
>> incompetence.
>>> 
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