Re: [beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[Mike]

On 7/2/20 7:04 PM, harry.steven...@gmail.com wrote:
Thanks. Fulfilling this by configuring ntp.conf sounds quite diable. I 
followed some instructions online but failed. Here is what in BBG's 
ntp.conf and Pi's ntp.conf. I use 192.168.0.102 to ssh into pi and 
192.168.4.2 to ssh into BBG.


Part of ntp.conf in BBG:
# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your 
server will
# pick a different set every time it starts up.  Please consider 
joining the

# pool: 

server 192.168.0.102

Part of ntp.conf in Pi:
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
restrict 192.168.4.0 mask 255.255.255.0 nomodify notrap


And here is the result for ntpq -p on BBG. I don't know how to check 
if BBG is really trying to make time sync.

debian@beaglebone:~$ sudo ntpq -p
     remote           refid      st t when poll reach  delay   offset  
jitter

==
 192.168.0.102   .XFAC.          16 u   58   64    0 0.000    0.000  
 0.000





reach 0 shows that your not reaching your ntp server, or it's refusing 
connections or...


It will (reach field) get to 377 if all is well.  This may also fail 
anyway as *most* ntp clients want more than one server. Typically at 
least 3, to ensure that you get a good chimer.


Mike

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Re: [beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[Franck Rougier]

It may depend on how your system is configured but look in:
/var/log/messages and /var/log/syslog
The “app” (daemon) responsible to sync is running as ntpd, every reboot will 
force a sync with your pi.
So the obvious way is to check the date after reboot. If it is correct, it 
means it sync’ed fine.
You can also check the journal with journalctl -u ntpd -n500 and look through 
the log.
The ntp query (ntpq) shows that your BBG is aware of the pi time server.

Franck Rougier

From: "beagleboard@googlegroups.com"  on behalf 
of "harry.steven...@gmail.com" 
Reply-To: "beagleboard@googlegroups.com" 
Date: Thursday, July 2, 2020 at 4:04 PM
To: BeagleBoard 
Subject: [beagleboard] Re: Setting system time and data frequently (offline, 
with LCM)

Thanks. Fulfilling this by configuring ntp.conf sounds quite diable. I followed 
some instructions online but failed. Here is what in BBG's ntp.conf and Pi's 
ntp.conf. I use 192.168.0.102 to ssh into pi and 192.168.4.2 to ssh into BBG.

Part of ntp.conf in BBG:
# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>

server 192.168.0.102

Part of ntp.conf in Pi:
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
restrict 192.168.4.0 mask 255.255.255.0 nomodify notrap


And here is the result for ntpq -p on BBG. I don't know how to check if BBG is 
really trying to make time sync.
debian@beaglebone:~$ sudo ntpq -p
 remote   refid  st t when poll reach   delay   offset  jitter
==
 192.168.0.102   .XFAC.  16 u   58   6400.0000.000   0.000



在 2020年7月2日星期四 UTC-4下午4:11:07，frou...@gmail.com写道：
Setup NTP server on the pi.
The BBB should have the ntpd (NTP daemon) already setup. Change the ntp 
configuration to point to the IP of your pi.
Let ntp maintain the time by itself no need for cron. Any scripts or custom 
implementation will had a delay which will increase the time drift between your 
systems.

To maintain the clock between reboots or when the pi is unavailable, purchase 
an i2c real time clock like the DS1307 and use ntp to keep the time sync'ed.

I hope this helps.

On Thursday, July 2, 2020 at 9:27:23 AM UTC-7, harry.s...@gmail.com wrote:
Yeah, GGB has its own power supply. And I am connecting raspberry pi and BBG 
through ethernet. For transmitting the message, it is done by LCM.
I think LCM is faster because at least there's no password issue and I hope to 
let the BBG time sync quite often(like every 1 min), but not too often because 
that would be unnecessary.

What I now have is a program(c or python) that can get the time sending by a 
raspberry pi. Now I plan to read the output and set the time using think 
command:   date -s "2 OCT 2006 18:00:00"
in the shell script. But I don't know how to do that.


在 2020年7月2日星期四 UTC-4上午11:03:20，Dennis Bieber写道：
On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in
gmane.comp.hardware.beagleboard.user
harry.steven007-re5jqeeqqe8avxtiumw...@public.gmane.org wrote:

>Hi,
>
>I am doing a project using both beaglebone and raspberry pi. Now only the
>pi has internet connection and I have to sync their time. Currently I can
>send the pi's time to beaglebone green every second, but I don't know how
>to use this data to set the system time on Beaglebone. I plan to write a
>shell script so it can be running all the time from boot. Anyone knows how
>to do that? Thanks.
>

"Information... We want... Information"

How is the BBG connected to the R-Pi for this transfer? If the R-Pi is
sending time data, there has to be something on the BBG that is reading it.

It would probably be easier to have the BBG /ask/ the R-Pi for the
time, and that could be done using a cron job on the BBG. Of course, that
means now the R-Pi has to have running process to accept the requests...

It all comes down to how the two devices are communicating. If the BBG
is connected to the R-Pi via USB (hope you are using an external power
supply on the BBG -- don't think an R-Pi USB can provide the power draw)
you might just need to configure the R-Pi as a gateway, and let the BBG NTP
(or whatever recent Debian/systemd sets up) do normal time sync through the
R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and let
the BBG time sync to it).


--
Dennis L Bieber
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[beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[harry . steven007]

Thanks. Fulfilling this by configuring ntp.conf sounds quite diable. I 
followed some instructions online but failed. Here is what in BBG's 
ntp.conf and Pi's ntp.conf. I use 192.168.0.102 to ssh into pi and 
192.168.4.2 to ssh into BBG. 

Part of ntp.conf in BBG:
# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
# pool: 

server 192.168.0.102

Part of ntp.conf in Pi:
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited
restrict 192.168.4.0 mask 255.255.255.0 nomodify notrap


And here is the result for ntpq -p on BBG. I don't know how to check if BBG 
is really trying to make time sync.
debian@beaglebone:~$ sudo ntpq -p
 remote   refid  st t when poll reach   delay   offset  
jitter
==
 192.168.0.102   .XFAC.  16 u   58   6400.0000.000  
 0.000



在 2020年7月2日星期四 UTC-4下午4:11:07，frou...@gmail.com写道：
>
> Setup NTP server on the pi.
> The BBB should have the ntpd (NTP daemon) already setup. Change the ntp 
> configuration to point to the IP of your pi.
> Let ntp maintain the time by itself no need for cron. Any scripts or 
> custom implementation will had a delay which will increase the time drift 
> between your systems.
>
> To maintain the clock between reboots or when the pi is unavailable, 
> purchase an i2c real time clock like the DS1307 and use ntp to keep the 
> time sync'ed.
>
> I hope this helps.
>
> On Thursday, July 2, 2020 at 9:27:23 AM UTC-7, harry.s...@gmail.com wrote:
>>
>> Yeah, GGB has its own power supply. And I am connecting raspberry pi and 
>> BBG through ethernet. For transmitting the message, it is done by LCM.
>> I think LCM is faster because at least there's no password issue and I 
>> hope to let the BBG time sync quite often(like every 1 min), but not too 
>> often because that would be unnecessary.
>>
>> What I now have is a program(c or python) that can get the time sending 
>> by a raspberry pi. Now I plan to read the output and set the time using 
>> think command:   date -s "2 OCT 2006 18:00:00" 
>> in the shell script. But I don't know how to do that.
>>  
>>
>> 在 2020年7月2日星期四 UTC-4上午11:03:20，Dennis Bieber写道：
>>>
>>> On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in 
>>> gmane.comp.hardware.beagleboard.user 
>>> harry.steven007-re5jqeeqqe8avxtiumw...@public.gmane.org wrote: 
>>>
>>> >Hi, 
>>> > 
>>> >I am doing a project using both beaglebone and raspberry pi. Now only 
>>> the 
>>> >pi has internet connection and I have to sync their time. Currently I 
>>> can 
>>> >send the pi's time to beaglebone green every second, but I don't know 
>>> how 
>>> >to use this data to set the system time on Beaglebone. I plan to write 
>>> a 
>>> >shell script so it can be running all the time from boot. Anyone knows 
>>> how 
>>> >to do that? Thanks. 
>>> > 
>>>
>>> "Information... We want... Information" 
>>>
>>> How is the BBG connected to the R-Pi for this transfer? If the 
>>> R-Pi is 
>>> sending time data, there has to be something on the BBG that is reading 
>>> it. 
>>>
>>> It would probably be easier to have the BBG /ask/ the R-Pi for 
>>> the 
>>> time, and that could be done using a cron job on the BBG. Of course, 
>>> that 
>>> means now the R-Pi has to have running process to accept the requests... 
>>>  
>>> It all comes down to how the two devices are communicating. If 
>>> the BBG 
>>> is connected to the R-Pi via USB (hope you are using an external power 
>>> supply on the BBG -- don't think an R-Pi USB can provide the power draw) 
>>> you might just need to configure the R-Pi as a gateway, and let the BBG 
>>> NTP 
>>> (or whatever recent Debian/systemd sets up) do normal time sync through 
>>> the 
>>> R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and 
>>> let 
>>> the BBG time sync to it). 
>>>
>>>
>>> -- 
>>> Dennis L Bieber 
>>>
>>>

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[beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[frougier]

Setup NTP server on the pi.
The BBB should have the ntpd (NTP daemon) already setup. Change the ntp 
configuration to point to the IP of your pi.
Let ntp maintain the time by itself no need for cron. Any scripts or custom 
implementation will had a delay which will increase the time drift between 
your systems.

To maintain the clock between reboots or when the pi is unavailable, 
purchase an i2c real time clock like the DS1307 and use ntp to keep the 
time sync'ed.

I hope this helps.

On Thursday, July 2, 2020 at 9:27:23 AM UTC-7, harry.s...@gmail.com wrote:
>
> Yeah, GGB has its own power supply. And I am connecting raspberry pi and 
> BBG through ethernet. For transmitting the message, it is done by LCM.
> I think LCM is faster because at least there's no password issue and I 
> hope to let the BBG time sync quite often(like every 1 min), but not too 
> often because that would be unnecessary.
>
> What I now have is a program(c or python) that can get the time sending by 
> a raspberry pi. Now I plan to read the output and set the time using think 
> command:   date -s "2 OCT 2006 18:00:00" 
> in the shell script. But I don't know how to do that.
>  
>
> 在 2020年7月2日星期四 UTC-4上午11:03:20，Dennis Bieber写道：
>>
>> On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in 
>> gmane.comp.hardware.beagleboard.user 
>> harry.steven007-re5jqeeqqe8avxtiumw...@public.gmane.org wrote: 
>>
>> >Hi, 
>> > 
>> >I am doing a project using both beaglebone and raspberry pi. Now only 
>> the 
>> >pi has internet connection and I have to sync their time. Currently I 
>> can 
>> >send the pi's time to beaglebone green every second, but I don't know 
>> how 
>> >to use this data to set the system time on Beaglebone. I plan to write a 
>> >shell script so it can be running all the time from boot. Anyone knows 
>> how 
>> >to do that? Thanks. 
>> > 
>>
>> "Information... We want... Information" 
>>
>> How is the BBG connected to the R-Pi for this transfer? If the 
>> R-Pi is 
>> sending time data, there has to be something on the BBG that is reading 
>> it. 
>>
>> It would probably be easier to have the BBG /ask/ the R-Pi for 
>> the 
>> time, and that could be done using a cron job on the BBG. Of course, that 
>> means now the R-Pi has to have running process to accept the requests... 
>>  
>> It all comes down to how the two devices are communicating. If 
>> the BBG 
>> is connected to the R-Pi via USB (hope you are using an external power 
>> supply on the BBG -- don't think an R-Pi USB can provide the power draw) 
>> you might just need to configure the R-Pi as a gateway, and let the BBG 
>> NTP 
>> (or whatever recent Debian/systemd sets up) do normal time sync through 
>> the 
>> R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and let 
>> the BBG time sync to it). 
>>
>>
>> -- 
>> Dennis L Bieber 
>>
>>

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[beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[harry . steven007]

Yeah, GGB has its own power supply. And I am connecting raspberry pi and 
BBG through ethernet. For transmitting the message, it is done by LCM.
I think LCM is faster because at least there's no password issue and I hope 
to let the BBG time sync quite often(like every 1 min), but not too often 
because that would be unnecessary.

What I now have is a program(c or python) that can get the time sending by 
a raspberry pi. Now I plan to read the output and set the time using think 
command:   date -s "2 OCT 2006 18:00:00" 
in the shell script. But I don't know how to do that.
 

在 2020年7月2日星期四 UTC-4上午11:03:20，Dennis Bieber写道：
>
> On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in 
> gmane.comp.hardware.beagleboard.user 
> harry.steven007-re5jqeeqqe8avxtiumw...@public.gmane.org  
> wrote: 
>
> >Hi, 
> > 
> >I am doing a project using both beaglebone and raspberry pi. Now only the 
> >pi has internet connection and I have to sync their time. Currently I can 
> >send the pi's time to beaglebone green every second, but I don't know how 
> >to use this data to set the system time on Beaglebone. I plan to write a 
> >shell script so it can be running all the time from boot. Anyone knows 
> how 
> >to do that? Thanks. 
> > 
>
> "Information... We want... Information" 
>
> How is the BBG connected to the R-Pi for this transfer? If the 
> R-Pi is 
> sending time data, there has to be something on the BBG that is reading 
> it. 
>
> It would probably be easier to have the BBG /ask/ the R-Pi for the 
> time, and that could be done using a cron job on the BBG. Of course, that 
> means now the R-Pi has to have running process to accept the requests... 
>  
> It all comes down to how the two devices are communicating. If the 
> BBG 
> is connected to the R-Pi via USB (hope you are using an external power 
> supply on the BBG -- don't think an R-Pi USB can provide the power draw) 
> you might just need to configure the R-Pi as a gateway, and let the BBG 
> NTP 
> (or whatever recent Debian/systemd sets up) do normal time sync through 
> the 
> R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and let 
> the BBG time sync to it). 
>
>
> -- 
> Dennis L Bieber 
>
>

-- 
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[beagleboard] Re: Setting system time and data frequently (offline, with LCM)

[Dennis Lee Bieber]

On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in
gmane.comp.hardware.beagleboard.user
harry.steven007-re5jqeeqqe8avxtiumw...@public.gmane.org wrote:

>Hi,
>
>I am doing a project using both beaglebone and raspberry pi. Now only the 
>pi has internet connection and I have to sync their time. Currently I can 
>send the pi's time to beaglebone green every second, but I don't know how 
>to use this data to set the system time on Beaglebone. I plan to write a 
>shell script so it can be running all the time from boot. Anyone knows how 
>to do that? Thanks.
>

"Information... We want... Information"

How is the BBG connected to the R-Pi for this transfer? If the R-Pi is
sending time data, there has to be something on the BBG that is reading it.

It would probably be easier to have the BBG /ask/ the R-Pi for the
time, and that could be done using a cron job on the BBG. Of course, that
means now the R-Pi has to have running process to accept the requests... 

It all comes down to how the two devices are communicating. If the BBG
is connected to the R-Pi via USB (hope you are using an external power
supply on the BBG -- don't think an R-Pi USB can provide the power draw)
you might just need to configure the R-Pi as a gateway, and let the BBG NTP
(or whatever recent Debian/systemd sets up) do normal time sync through the
R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and let
the BBG time sync to it).


-- 
Dennis L Bieber

-- 
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