Exec Binding fails to execute python script after update

Setup, Configuration and Use Migration
1

Hi there,

I migrated to OH3 and now I’m having problems with the call of a python script with an additional parameter. I’d like to set the Volume of my LG-TV via Serial Port (yeah… no smart TV, but it works).

rule "LG Volume"
when
    Item LG_Volume received command
then
    var Number = LG_Volume.state.toString;
    logInfo("lgvolume.rules", "TV Lautstärke gesetzt auf" + Number)
    Thread::sleep(500)
    executeCommandLine("/home/to/fernseher_lautstärke.py " + Number)
end

A similar script to power on / off works. I can also call the script from the command line using “/home/to/fernseher_lautstärke.py 13”, also as user openhab.

However, when openhab tries to invoke the script it fails and the log says:

021-01-24 13:00:28.428 [WARN ] [rg.openhab.core.io.net.exec.ExecUtil] - Error occurred when executing commandLine '[/home/to/fernseher_lautstärke.py 13]'
java.io.IOException: Cannot run program "/home/to/fernseher_lautstärke.py 13": error=2, No such file or directory

It worked before the update and the call seems right. What am I missing? Did anything change hiere?

My python script looks like this, but I suppose the error is somewhere else because calling it from the console works…:

#!/usr/bin/env python

import serial
import sys

ser = serial.Serial(

   port='/dev/LGTV',
   baudrate = 9600,
   parity=serial.PARITY_NONE,
   stopbits=serial.STOPBITS_ONE,
   bytesize=serial.EIGHTBITS,
   timeout=1
)
temporaer = hex(int(sys.argv[1]))
temporaer2 = temporaer.replace("0x","")
ser.write('kf 01 %s\r'%(temporaer2))

Thanks for your support!

2

Yes, there are quite a few threads in this forum about new syntax for OH3 for executeCommandLine(), as well as the breaking changes release notes.

3

Oh, missed the breaking change there. Thank you!
The thread you linked is helpful in the end (however people are trying stuff not working).

I solved it like this:

    var Number = LG_Volume.state.toString;
    val cmnd = "/home/to/fernseher_lautstärke.py " + Number
    executeCommandLine(cmnd.split(" "))

This works for me again. :slight_smile: