[Solved] Need help with ShellSwitch (python launcher creates timeout in pimatic)

---

Hey everyone,

I was hoping maybe one of you experienced developers might have an idea how to fix my issue. The thing is I am running a LCD display using a python script outside of Pimatic, since I wanted to display a couple of things which aren’t available through Pimatic - yet. The script runs fine and it causes not issues whatsoever if I run it over the command line. It consists of two parts: One that powers up a pin on the Raspberry Pi to enable the flow of energy through my IRL640 MOSFET and then launches the LCD script. The second one finds and kills the related processes first, then switches of the pin.

Now here comes the issue: When I use a ShellSwitch and I try to turn the display on, the GPIO pin gets powered up and the script (which is supposed to run until told otherwise is executed). So from a physical standpoint everything is fine. Also when run from the console. But If I use that in Pimatic, it also executes but then decides to say “Timeout” and go onto “off”-mode even though the scrip continues. But I obviously can’t turn it off anymore using the ShellSwitch.

Has anyone maybe gotten an idea how to fix this? Below is my code for the lcd-startup.sh.

#set mosfet pin for LCD to output
/usr/local/bin/gpio mode 0 out
#power up mosfet pin
/usr/local/bin/gpio write 0 1
#launch the python script which runs the display in background
python /home/pi/lcd/display.py &
#exit with code 0 (no errors)
exit 0

Thanks in advance!

I have something similar to control my LG TV . I use the gpio plugin to switch on/off and run a Python script by rule.

Plugin

{
      "plugin": "gpio"
    },

Device

{
      "id": "gpio25",
      "class": "GpioSwitch",
      "name": "lg_tv",
      "gpio": 25
    },

execute py script

execute "sudo python3 /home/pi/lg_wohnzimmer.py 1"

@magic-tune Thank you very much that actually worked pretty well with suppressing the output of errors or anything.

For those who are curious, this is how I suppressed the errors: "sudo python /home/pi/lcd/display.py > /dev/null 2>&1 || true"
Comment: Write errors and other stuff to dev/null and return true!

this is my solution to control my lg plasma over the network

a simple button device

    {
      "id": "LGControl",
      "name": "LG Control",
      "class": "ButtonsDevice",
      "buttons": [
        {
          "id": "LGControl_button_off",
          "text": "Turn off"
        },
        {
          "id": "LGControl_button_ch_incr",
          "text": "CH+"
        },
        {
          "id": "LGControl_button_ch_descr",
          "text": "CH-"
        },
        {
          "id": "LGControl_button_vol_incr",
          "text": "Vol+"
        },
        {
          "id": "LGControl_button_vol_descr",
          "text": "Vol-"
        },
        {
          "id": "LGControl_button_mute",
          "text": "Mute"
        }
      ]
    }

a lot of rules

 {
      "id": "lgcontrol-rule-btn-ch-incr",
      "name": "LGControl_rule_btn_ch_incr",
      "rule": "if LGControl_button_ch_incr button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 27\"",
      "active": true,
      "logging": false
    },
    {
      "id": "lgcontrol-rule-btn-ch-descr",
      "name": "LGControl_rule_btn_ch_descr",
      "rule": "if LGControl_button_ch_descr button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 28\"",
      "active": true,
      "logging": false
    },
    {
      "id": "lgcontrol-rule-btn-mute",
      "name": "LGControl_rule_btn_mute",
      "rule": "if LGControl_button_mute button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 26\"",
      "active": true,
      "logging": false
    },
    {
      "id": "lgcontrol-rule-btn-vol-incr",
      "name": "LGControl_rule_btn_vol_incr",
      "rule": "if LGControl_button_vol_incr button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 24\"",
      "active": true,
      "logging": false
    },

    {
      "id": "lgcontrol-rule-btn-vol-descr",
      "name": "LGControl_rule_btn_vol_descr",
      "rule": "if LGControl_button_vol_descr button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 25\"",
      "active": true,
      "logging": false
    },
    {
      "id": "lgcontrol-rule-btn-turnoff",
      "name": "LGControl_rule_btn_turnOff",
      "rule": "if LGControl_button_off button is pressed then execute \"python3 /home/pi/lgcommander/lgcommander.py -H $LG_IP -p $LG_PORT -k $LG_KEY -c 1\"",
      "active": true,
      "logging": false
    }

to simple change the parameter 3 variables

    {
      "name": "LG_IP",
      "value": "\"192.168.170.25\""
    },
    {
      "name": "LG_PORT",
      "value": 8080
    },
    {
      "name": "LG_KEY",
      "value": "\"AABBCC\""
    }

i’m tried many forks of lgcommander and this one works perfect for me --> https://github.com/ypid/lgcommander

Looks like this http://fs2.directupload.net/images/150701/8sxgwuj6.png

@Harrdy Hey, i tried this python programm and have also tried a lot of scripts. but no one will work.

i always get this:

root@raspberrypi:~/programme/LG# python3 lgcommander.py -H 192.168.0.100 -p 8080 -k DDGURF -c 25
# DEBUG: Detecting accepted protocol.
# DEBUG: Trying to connect to port 3000/tcp
# DEBUG: Testing protocol: hdcp
[Errno 111] Connection refused

the lg has a static ip.

i have no idea why the connection is refused, i have a LW5500 LG TV the android app works good.

any ideas? the pair Key Should be the right one.

thank you guys.

@p4co86
This one works 4me…

#!/usr/bin/env python3
 
import http.client
import xml.etree.ElementTree as etree
import sys
lgtv = {}
headers = {"Content-Type": "application/atom+xml"}
# Replace 111111 in the next line with the key displayed in the tv screen.
lgtv["pairingKey"] = "111111"
# Replace with the ip adress of your LG tv.
lgtv["ipaddress"] = "192.168.1.234"
 
def displayKey():
    conn = http.client.HTTPConnection( lgtv["ipaddress"], port=8080)
    reqKey = "<?xml version=\"1.0\" encoding=\"utf-8\"?><auth><type>AuthKeyReq</type></auth>"
    conn.request("POST", "/roap/api/auth", reqKey, headers=headers)
    httpResponse = conn.getresponse()
    if httpResponse.reason != "OK" : sys.exit("Network error")
    return httpResponse.reason
 
def getSessionid():
    conn = http.client.HTTPConnection( lgtv["ipaddress"], port=8080)
    pairCmd = "<?xml version=\"1.0\" encoding=\"utf-8\"?><auth><type>AuthReq</type><value>" \
            + lgtv["pairingKey"] + "</value></auth>"
    conn.request("POST", "/roap/api/auth", pairCmd, headers=headers)
    httpResponse = conn.getresponse()
    if httpResponse.reason != "OK" : return httpResponse.reason
    tree = etree.XML(httpResponse.read())
    return tree.find('session').text
 
def handleCommand(cmdcode):
    conn = http.client.HTTPConnection( lgtv["ipaddress"], port=8080)
    cmdText = "<?xml version=\"1.0\" encoding=\"utf-8\"?><command>" \
                + "<name>HandleKeyInput</name><value>" \
                + cmdcode \
                + "</value></command>"
    conn.request("POST", "/roap/api/command", cmdText, headers=headers)
    httpResponse = conn.getresponse()
 
#main()
 
theSessionid = getSessionid()
 
if len(theSessionid) < 8 : sys.exit("Could not get Session Id: " + theSessionid)
 
lgtv["session"] = theSessionid
 
result = str(sys.argv[1])
 
handleCommand(result)

and how do you control them? could you give a code example ?

@p4co86
power off:

python3 /home/pi/lg.py 0

Here a list with all codes.

ok did you get any response in the command line or nothing?

how do you find out the pairing key?

Pairing key should popup on the tv. Same as with the LG-APP. If it doesn`t popup, you can try to reset the lg-app. On first start the key should popup.

OK. Will try it tommorow. Wich TV do you have, i read something about different protocols Form 2012 TV. Mine is a lw5500 i think its a TV before 2012

Yes this script works only with 2012+ LG-TVs. LW5500 is 2011!
Maybe this helps

Your link gives me a 404 error.

Try again. Works fine for me.