Hello all, I was working on an application using the owfs c api.
The target platform is a raspberry pi with a DS9490 USB adapter
connected. There are about 15 DS18B20 mostly in a star topology.
At first everything seems to work fine.
Then i tried to force cache updates while my application is idle by
reading the uncached entries in turn. So i can access the cached values
fast if needed. This works also.
But after a few minutes the Sensors starts disapearing.
Because i suspect my application code, i tried to replicate this
behaviour with owfs tools.
I start the Server:
owserver -r --foreground -u --debug 2>owserver.log
DEBUG MODE
libow version:
2.9p1
And on another Machine:
while true; do owread -s heizung uncached/28.5F74E2040000/temperature;
done
Indeed are the Sensors disapearing after a few Minutes.
I will attach the debug Output of the Server. "error.log" is one of the
failed transactions. But i expect the interesting parts are earlier.
In owserver-cut.log.gz i cut down a large stderr logfile. It begins
with the Start of the Server, i deleted the logs of many successful
querys and leave some before the point where things go wrong.
I would be very glad if somebody can tell me what is going on here.
I would not be surprised if there are transmission errors on the 1-wire
bus. But why can't the server recover from this? As soon as i restart
the server, everything is fine again for a few minutes.
Can this be a specific problem of the usb hostadapter which may go away
by changing to an i2c interface? (I've considered this anyway)
Or is it a pure 1-Wire bus problem?
Thank you very much in advance!
Klaus
error.log
Description: Binary data
owserver-cut.log.gz
Description: Binary data
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