write the program to the changing varants of a variable?

[abdolhamednik]

Hi, I have a problem writing the program.thank you for your help,
I want to write a program that runs when a variable changes.
It is important to me that the program be run only when it changes.
Can I do this through command 'uservariablechanged' ?
How to use the a command ' uservariablechanged' ??

Thank for your guidance

[psubiaco]

Hi,
Setup -> More options -> Events
click on + button
select LUA -> User variables
and you'll get a clean script template already made that will be called everytime a variable changes.
Regards.
Paolo

[waaren]

and you'll get a clean script template already made that will be called everytime a variable changes.

That is not completely true. This will be called every time a variable is updated, regardless if the value changed or not.
If you need that functionality you will have to compare the new value against the last value (you will have to store that somewhere e.g. dzVenst persistent storage or another variable)

[abdolhamednik]

Hello, thank you for your guidance..
Is it possible to write a program for me as a small example?
I want a program that turns on the lights when a variable called Smart changes.


Example:

Code: Select all

commandArray ={}
   smart=tonumber(uservariables['smart'])  

    if smart ==1 then 
        commandArray['light']='On'
   else
           if smart==0 then 
                 commandArray['light']='Off'
            end
    end
return commandArray

please edit lines 4 and 7 for me.
I do not know how to use the a 'uservariablechanged' command.

thank you for your help.

[waaren]

Is it possible to write a program for me as a small example? I want a program that turns on the lights when a variable called Smart changes.

This example will do something every time the uservariable is updated.

Code: Select all

commandArray ={}

   if uservariablechanged['smart'] then

        smart = tonumber(uservariablechanged['smart']) or 99
        if smart == 1 then
            commandArray['light'] = 'On'
        elseif smart == 0 then
            commandArray['light'] = 'Off'
        else
            print ('smart is neither 0 nor 1, but ' .. uservariablechanged['smart'] )
        end

    end

return commandArray

And this exampple will only do something when the value of smart changed but requires an extra variable of the same type called "smart_lastValue"

Code: Select all

commandArray ={}
   
   if uservariablechanged['smart'] and ( uservariables['smart_lastValue'] ~= uservariablechanged['smart']) then   
        commandArray['Variable:smart_lastValue'] = uservariablechanged['smart']
        
        smart = tonumber(uservariablechanged['smart']) or 99 
        if smart == 1 then 
            commandArray['light'] = 'On'
        elseif smart == 0 then 
            commandArray['light'] = 'Off'
        else
            print ('smart is neither 0 nor 1, but ' .. uservariablechanged['smart']  )
        end
    
    end

return commandArray

[abdolhamednik]

Hi thank you very much for your help.
I copied both programs you wrote but is gives the error :

2021-05-16 08:31:34.738 Error: EventSystem: in NEW1: [string "--[[commandArray = {}..."]:37: attempt to index a nil value (global 'uservariablechanged')


smart is also available in uservariables, but I don't know where problem is.

thank you for helping me.

[abdolhamednik]

Both programs are adjunct when they're on the all option.
But when they are on option ,uservariable, they don,t habe rrror, but in this case it doesn't run, that means the light don't go off or on whit smart changes.

[waaren]

2021-05-16 08:31:34.738 Error: EventSystem: in NEW1: [string "--[[commandArray = {}..."]:37: attempt to index a nil value (global 'uservariablechanged')

You should save it with trigger User variable and you should have added a uservar with name smart_lastValue and same type as uservar smart.

[abdolhamednik]

I'll put the smart program and the light on here.
I'd appreciate it if you told me exactly the flaw in the program or edited the program for me.

smart program(Device):

Code: Select all

commandArray ={}

smart = tonumber(uservariables['smart'])

if devicechanged['auto/man']=='Open' then
commandArray['Variable:smart']='1'
else
if devicechanged['auto/man']=='Closed' then
commandArray['Variable:smart']='0'
end
end

return commandArray

program light(uservariable):

Code: Select all

commandArray ={}

if uservariablechanged['smart'] then

smart = tonumber(uservariablechanged['smart']) or 99
if smart == 1 then
commandArray['light'] = 'On'
elseif smart == 0 then
commandArray['light'] = 'Off'
else
print ('smart is neither 0 nor 1, but ' .. uservariablechanged['smart'] )
end

end

return commandArray

variable smart also exists in uservariables.
But the light doesn't go off or on white smart changes.

[waaren]

I'll put the smart program and the light on here.
I'd appreciate it if you told me exactly the flaw in the program or edited the program for me.

Have you added the domotizc uservariable smart_lastValue with the same type as smart? If not please do now.

Please show what you see in the log with below version saved as triggered User variable and after updating the uservariable smart with 0 or 1.

Code: Select all

-- Added some extra checks and debug printlines.

commandArray ={}
   
   
    if uservariablechanged then
        if uservariables['smart_lastValue'] then
           if uservariablechanged['smart'] and ( uservariables['smart_lastValue'] ~= uservariablechanged['smart']) then   
                print ('DEBUG - Uservar:  ' .. 'smart value changed'  )
                    
                commandArray['Variable:smart_lastValue'] = uservariablechanged['smart']
                
                smart = tonumber(uservariablechanged['smart']) or 99 
                if smart == 1 then 
                    print ('DEBUG - Uservar:  ' .. 'Switching light On'  )
                    commandArray['light'] = 'On'
                elseif smart == 0 then 
                    print ('DEBUG - Uservar:  ' .. 'Switching light Off'  )
                    commandArray['light'] = 'Off'
                else
                    print ('DEBUG - Uservar:  ' .. 'smart is neither 0 nor 1, but ' .. uservariablechanged['smart']  )
                end
            
            elseif uservariablechanged['smart'] then
                print ('DEBUG - Uservar:  ' .. 'smart updated but value did not change'  )
            else
                print ('DEBUG - Uservar:  ' .. 'smart not updated'  )
            end
        else
            print ('DEBUG - Uservar:  ' .. 'smart_lastValue does not exist.'  )
        end
        
    else
        print ('DEBUG - Uservar:  ' .. 'Not triggered by a uservariable'  )
    end
    
return commandArray

[abdolhamednik]

Hi there,your friend
Thank you greatly for your help and guidance.
I edited the program you sent yesterday a little bit and it was kind of right.
I'll out the program here and continue the description.

program:

Code: Select all

commandArray ={}
    print('hello....')
    if uservariablechanged then
        if uservariables['smart_lastValue'] then
           if uservariablechanged['smart'] and ( uservariables['smart_lastValue'] ~= uservariablechanged['smart'])   then   
                print ('DEBUG!!!!! - Uservar:  ' .. 'smart value changed'  )
                    
                commandArray['Variable:smart_lastValue'] = uservariablechanged['smart']
                
                smart = tonumber(uservariablechanged['smart']) or 99 
                if smart == 1 then 
                    print ('DEBUG!!!!! - Uservar:  ' .. 'Switching light On'  )
                    commandArray['light'] = 'On'
                elseif smart == 0 then 
                    print ('DEBUG!!!!! - Uservar:  ' .. 'Switching light Off'  )
                    commandArray['light'] = 'Off'
                else
                    print ('DEBUG!!!!! - Uservar:  ' .. 'smart is neither 0 nor 1, but ' .. uservariablechanged['smart']  )
                end
            
            elseif uservariablechanged['smart'] then
                print ('DEBUG!!!!! - Uservar:  ' .. 'smart updated but value did not change'  )
            else
                print ('DEBUG!!!!! - Uservar:  ' .. 'smart not updated'  )
            end
        else
            print ('DEBUG!!!!!! - Uservar:  ' .. 'smart_lastValue does not exist.'  )
        end
        
    else
        print ('DEBUG!!!!! - Uservar:  ' .. 'Not triggered by a uservariable'  )
    end
    
return commandArray

The smart variable in the above program changes between a zero number or one in another program under certain conditions.
I'll put the program that changes 'smart' :
(Devaice)

Code: Select all

smart = tonumber(uservariables['smart'])

if devicechanged['auto/man']=='Open' then
    commandArray['Variable:smart']='On'
else
    if devicechanged['auto/man']=='Closed' then
         commandArray['Variable:smart']='Off'
    end
end

return commandArray

Now the program you wrote is wrong when it changes that second smart program the program you wrote will not be executed.
But when I manually change the smart variable in the 'uservariables' the program works properly and the lights turn on or off.
Now I have a few questions:
1-what is reason for this problem?
2-what's the reason you used variable 'smart_value' ?

I apologize for taking your time..
If you edite the program for me and send it to me,I'll be very grateful.

Thanks Faravan.

[waaren]

Now the program you wrote is wrong when it changes that second smart program the program you wrote will not be executed.
But when I manually change the smart variable in the 'uservariables' the program works properly and the lights turn on or off.

Probably a language thing but I tested the script and it behaves as expected, so definitely not wrong.

Now I have a few questions:
1-what is reason for this problem?

Reasons;

• When you set a domoticz uservariable from a classic Lua script or Blockly it will not trigger an event.
  You will have to change the uservar manually, or via a JSON call or use a dzVents script to do that.
• You set the value of the smart uservarable to 'On' or 'Off' but test if it's 0 or 1

2-what's the reason you used variable 'smart_value' ?

I used the uservariable smart_lastValue to keep track of the previous value of smart to ensure that the script only switches the light when the value of smart changed and not when smart is updated but the value is kept unchanged.

I also have some questions for you.

• I asked a couple of times for the output of the log to help me understanding what happens but you ignore this question. Why?
• Your profile states that you use V4.9700 is that stil accurate?

[abdolhamednik]

Hello, thank you for your help.
I will test the program again and send you the log report
System log for when I manually change Smart:

when smart=1 :
2021-05-17 15:49:50.156 (GSB) Light/Switch (light)
2021-05-17 15:49:50.088 Status: LUA: hello....
2021-05-17 15:49:50.104 Status: LUA: DEBUG!!!!! - Uservar: smart value changed
2021-05-17 15:49:50.105 Status: LUA: DEBUG!!!!! - Uservar: Switching light On
2021-05-17 15:49:50.117 Status: EventSystem: Script event triggered: Script #2


when smart=0 :
2021-05-17 15:51:44.132 (GSB) Light/Switch (light)
2021-05-17 15:51:44.013 Status: LUA: hello....
2021-05-17 15:51:44.027 Status: LUA: DEBUG!!!!! - Uservar: smart value changed
2021-05-17 15:51:44.030 Status: LUA: DEBUG!!!!! - Uservar: Switching light Off
2021-05-17 15:51:44.037 Status: EventSystem: Script event triggered: Script #2

smart and smart_value Available in uservariables.

[abdolhamednik]

Log for when Smart is changed by Event:

when smart=1 :
2021-05-17 15:57:11.870 (GSB) Light/Switch (R9(1.44)<3-3>[66]**)
2021-05-17 15:57:11.831 Status: User: unity-tech (IP: 192.168.1.80) initiated a switch command (66/R9(1.44)<3-3>[66]**/On)
2021-05-17 15:57:12.565 Status: LUA: smart=1 chon kelid tablo hooshmand shod_sistem hooshmand amade be kar hast
2021-05-17 15:57:12.569 Status: EventSystem: Script event triggered: smart_hadi_new

when smart=0
2021-05-17 15:57:58.342 Status: User: unity-tech (IP: 192.168.1.80) initiated a switch command (66/R9(1.44)<3-3>[66]**/Off)
2021-05-17 15:57:58.784 Status: LUA: smart=0 chon kelid tablo dasti shod
2021-05-17 15:57:58.797 Status: EventSystem: Script event triggered: smart_hadi_new

Thank you very much for your kindness.

[waaren]

smart and smart_value Available in uservariables.

Do you mean smart_lastValue?

but despite that; script works as expected

[waaren]

Log for when Smart is changed by Event:

Again: uservariables updated by a Lua script or Blockly do not trigger an event.
Do not enter your personal details here. They can be misused and I do not give other support then via the public part of this forum with an exception if any personal data need to be shared.