I've run into two problems with owserver (on an NSLU2 with a DS9490R
USB adapter). I've been using 2.7p17 and 2.7p21, both have the same
problems.
1. Owserver is unable to read all sensors on my Hobby Boards hub, but
the sensors are there in the directory listings. E.g.:
This sensor is ok:
# owget -s 3000 1F.BCFD04000000/aux/28.CE11EC010000D3/temperature
12.75
The directory listing is ok:
# owget -s 3000 1F.BCFD04000000/main/26.13FF83000000FB/HIH4000
1F.BCFD04000000/main/26.13FF83000000FB/HIH4000/humidity
But I can't read the value:
# owget -s 3000 1F.BCFD04000000/main/26.13FF83000000FB/HIH4000/humidity
ServerRead: Data error on
1F.BCFD04000000/main/26.13FF83000000FB/HIH4000/humidity
Same problem when I use owcapi. Sometimes I don't get the
ServerRead error, but owget just sits there never finishing
(usually happens after I've run the program described in problem 2
below). It looks like that on a given DS2409 hub, it can only
access values either on the main or the aux branch, not both. I
thought owserver would do the switching automatically as it does
for the directory listings?
The hub works fine with Oww.
2. Owserver suddenly dies. This happens frequently (after a few
minutes) on the NSLU2. It has also happened on another 1-wire
network running on a regular x86_64 pc, but I'm unable to reproduce
there.
I've written a C program using owcapi, which makes an Oww like log
file by accessing several owservers. The idea is get several
sources into one log file and one offline source is not to affect
logging from the other sources and have owserver to all the low
level stuff.
It works this way:
* Fork off a new process for every owserver.
* In the new processes make a thread for every value to be logged
which simply reads and store the value at its own pace (typically
every 10 seconds).
* When it's time to write to the log file, the parent will cancel
all the threads, process all data from every thread (average, max,
min, whatever to be logged etc) and log to file.
It will produce quite a few owserver requests, but hardly more than
a few per second and most will be for cached values. Should this
cause any problems for owserver? The program causes owserver to
fork into many processes (in this setup, about 15), but that
shouldn't be a problem.
--
Steinar ; NIL DIFFICILE VOLENTI ; http://latinitas.org ; http://voksenlia.net
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