> On 30 May 2016, at 17:27, Guy COLIN <guy.co...@gmail.com> wrote:
>
> Also I think that monitoring the directories isn't the best method.
> I'm going to use new script to read the devices and check if some are
> missing.
> It will take sometime, no problem I'm patient ;-)
> I'll keep updating here.
My 1cent of advice:
I have a (python) script monitoring a network of sensors (DS2438) for years.
Of course your mileage may vary, but here are my choices.
1) The list of sensors is hardwired in a configuration file, no device listing
or discovery at runtime.
2) Data is logged with rrdtool in RRD databases (one for each sensor) with
step=60s.
3) Every 30s all sensors are read and the corresponding RRDs updated. If a read
fails, don worry, just skip it.
By doing so you will end up with a RRD database that records every 60s the
average of two sensor samples. In the case of a failed read, the logged value
will be the one of a single sample, eventually of a previous time step.
(Actually the story is a little more complicated… every 60s a primary data
point is generated by averaging the valid samples, typically two. What actually
is recorded in the database depends on the consolidation function used, but
this is another story).
Read errors are so unfrequent that I simply stopped looking at the logs. RRD is
not an easy tool, but by properly implemented and tuned it becomes very robust;
at an eyeball inspection the graph generated from the RRD databases are
flawless: no missing points, no spikes nor outliers.
Stefano
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