[collectd] collectd for embedded, time tag

[Florian Forster]

Hi Denys,

right now, the network plugin treats a zero time as an error and won't 
pass the metric on to the daemon. The "collectd.org/network" Go package 
doesn't appear to do this check.

How does sleeping work on the ESP8266? Could you keep track of the time 
spent sleeping and increment the time accordingly, only synchronizing 
with an external time source every once in a while?

I would in principle be open to changing (and documenting) the semantics 
so that "time == 0" means "fill in time when receiving". We might make 
this behavior a config option of the network plugin, though, as it may 
create consistency problems when using multiple servers.

Best regards,
—octo

On 2020-04-19 13:19, Denys Fedoryshchenko wrote:
> Hi!
> 
> I wrote minimal collectd binary protocol implementation for
> microcontroller ESP8266,
> https://github.com/nuclearcat/collectd-embedded .
> Whole point is to collect data from multiple battery sensors, and
> collectd can save a lot of time, as it is udp and works as "fire and
> forget".
> But one problem remains, chip don't have RTC, so i have to NTP each
> "wake up" to send "time" tag with timestamp.
> Is there any hack to not send time, or send as zero or something, so
> it will be marked by collectd automatically as N/NOW(), as in
> plaintext protocol ?
> I read wiki for binary protocol, checked sources, but quick search
> didn't hinted me at anything.
> Any help appreciated.
> 
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