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I have added an event shell script in the related js file:

way.devices[8].instances[0].commandClasses[48].data.level.bind(function() {
try {
system("sh /opt/notify.sh" + this.value );
} catch(err) {
debugPrint("Failed to execute command: " + err);
}

and after some time I will get in log:

Failed to execute command: Too many open files
Looking for the open files I see after not a very long time:

root@raspberrypi:/tmp# lsof | grep z-way-ser | grep -c FIFO
2635

full lines like this:
z-way-ser 26556 26560 root 158w FIFO 0,8 0t0 6266559 pipe
z-way-ser 26556 26560 root 159r FIFO 0,8 0t0 6267569 pipe

The shell script itself does nothing - all possible things hve removed...
notify.sh:
# any comment
exit

If there is anything inside it will be executed - this is not the problem.

I do not understand why here will be created such a lot of open pipes.
It seems that every call will open 5 pipes (and never close it).

Restarting Z-Way wil help, but after some time the same again.

Any idea? What here maybe wrong?

I wanted to know if there are any news about this issue as I am facing the same problems as reported by michap.
z-way-server seems to open but never close the mentioned FIFO pipes. I guess the system() function call is somewhat broken.

Are there workarounds for this issue or is an update fix already in the works?

Thanks in advance for any feedback!

Greets,
Stefan

Fixed several days ago in our test branch. Will become public in a week or so.

I am waiting impatiently for this fix as this bug forces me to restart z-way-server around 2 times per day...
Many thanks in advance!

Greets,
Stefan

4th evening or 5th morning if nothing critical is found during last tests.