[Ovmsdev] System date set?
Stephen Casner
casner at acm.org
Sun Feb 25 05:44:21 HKT 2018
Mark,
Thanks for this. I've made a small change to make 'status' the
default argument for the command if you don't give one. (I made a
change to the command system this some months ago to enable this but
it hasn't been used much yet.)
I have a few comments on the time system:
- A full NTP daemon does much more than select among time sources by
stratum. Given multiple sources, it also has mechanisms to try to
detect "falsetickers" (a Dave Mills term) and strategies to choose
between stepping or slewing time depending upon which is more
appropriate for the way the time source is used.
- One of the ESP-IDF example programs is SNMP (simple NTP) using the
capability built into LwIP. It is easy to invoke -- as a test I
just added this to console_ssh to take advantage of its existing
event notification for wifi coming up:
@@ -32,6 +32,7 @@
#include <lwip/def.h>
#include <lwip/sockets.h>
#undef bind
+#include "apps/sntp/sntp.h"
#include "freertos/queue.h"
#include "ovms_log.h"
#include "ovms_events.h"
@@ -153,6 +155,11 @@ void OvmsSSH::NetManInit(std::string event, void* data)
// Only initialise server for WIFI connections
if (!MyNetManager.m_connected_wifi) return;
+ ESP_LOGI(tag, "Initializing SNTP");
+ sntp_setoperatingmode(SNTP_OPMODE_POLL);
+ sntp_setservername(0, (char*)"pool.ntp.org");
+ sntp_init();
+
ESP_LOGI(tag, "Launching SSH Server");
int ret = wolfSSH_Init();
if (ret != WS_SUCCESS)
One problem with fitting this into the time scheme that you have
implemented is that it will be updating time in the background on
its own. The other operating mode is SNTP_OPMODE_LISTENONLY, which
I don't think would be useful. There are parameters defined in
components/lwip/include/lwip/apps/sntp/sntp_opts.h that might be
useful to change. The current update interval is one hour.
- Another aspect of the SNMP example program is the use of the
environment variable TZ to control the local timezone. Here is the
'date' command I implemented as a test:
void date(int verbosity, OvmsWriter* writer, OvmsCommand* cmd, int argc, const char* const* argv)
{
time_t now;
struct tm timeinfo;
char strftime_buf[64];
setenv("TZ", "PST8PDT,M3.2.0/2,M11.1.0", 1);
tzset();
time(&now);
localtime_r(&now, &timeinfo);
strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
writer->printf("The current date/time in Sunnyvale is: %s\n", strftime_buf);
}
Perhaps we should have a config parameter for timezone?
-- Steve
On Sat, 24 Feb 2018, Mark Webb-Johnson wrote:
> I’ve done a very rough implementation of this:
>
> OVMS > time set 1519486746
> Time set (at stratum 15)
>
> OVMS > time status
> UTC Time: Sat Feb 24 15:39:09 2018
> Local Time: Sat Feb 24 15:39:09 2018
> Provider: time
>
> PROVIDER STRATUM UPDATE TIME
> *time 15 4 Sat Feb 24 15:39:10 2018
>
> OVMS > time status
> UTC Time: Sat Feb 24 15:39:14 2018
> Local Time: Sat Feb 24 15:39:14 2018
> Provider: time
>
> PROVIDER STRATUM UPDATE TIME
> *time 15 9 Sat Feb 24 15:39:15 2018
>
> I’ll work on it some more tomorrow. As it is, components can now call MyTime.Set(…) to feed their opinion of time into the system.
>
> Regards, Mark.
>
> > On 24 Feb 2018, at 10:23 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> >
> > I forgot about vehicles. Tesla Roadster is the same.
> >
> > I’ll write an ovms_time component now. Then, we can all submit time to it appropriately.
> >
> > class OvmsTime
> > {
> > public:
> > OvmsTime();
> > ~OvmsTime();
> >
> > public:
> > void Set(char* provider, int stratum, bool trusted, time_t time);
> > };
> >
> > extern OvmsTime MyTime;
> >
> > Just follow the NTP stratum approach (distance from a zero-delay device). Trusted is a separate indication that just sets stratum level to 16. The provider is simply the logging TAG.
> >
> > Internal implementation is like NTP. We track the last times from all providers, and pick the one with the lowest stratum that has reported within a reasonable time.
> >
> > We can add the boot-time save/restore later (once Michael has done that code for safe boot, etc).
> >
> > Regards, Mark.
> >
> >> On 24 Feb 2018, at 9:19 PM, Geir Øyvind Vælidalo <geir at validalo.net <mailto:geir at validalo.net>> wrote:
> >>
> >> Sounds like a plan. I can get time from the car too, but the resolution is several seconds, so I think we need to have some sort of priority here. Maybe SNTP first, then GPS, cellular and finally “car”?
> >>
> >> Geir
> >>
> >> Sendt fra min iPhone
> >>
> >>> 24. feb. 2018 kl. 04:36 skrev Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>>:
> >>>
> >>> I don’t think so.
> >>>
> >>> There are various sources for date/time. GPS. Cellular. SNTP. Need to ensure that they are not all fighting.
> >>>
> >>> Another module to do this? Have components tell it their opinion of the time, then it centrally decides and updates system clock if necessary
> >>>
> >>> Also store last clock in RTC ram so during a crash/reboot it can recover the last know time?
> >>>
> >>> Regards, Mark
> >>>
> >>>> On 24 Feb 2018, at 9:44 AM, Stephen Casner <casner at acm.org <mailto:casner at acm.org>> wrote:
> >>>>
> >>>> Does the sytem date get set anywhere (presumably from GPS)?
> >>>>
> >>>> This question occurred to me as I'm working on a side project using
> >>>> the DEVKIT-C module which won't have access to GPS so I added the code
> >>>> to set the data using SNTP.
> >>>>
> >>>> -- Steve
> >>>> _______________________________________________
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> >>>
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