Make Lua script only runs when device has changed

[curious]

I created a new hardware device named Buienradar and a dummy device with six virtual sensors named "Buienradar dummies"
When I run next Lua script all virtual sensors are updated correct (One of the virtual sensors is named "Buienradar Wind".

Code: Select all

local idxt = 365 --idx of the virtual temperature sensor you need to change this to your own Device IDx
local idxh = 366 --idx of the virtual humidity sensor you need to change this to your own Device IDx
local idxi = 367 --idx of the virtual pressure sensor you need to change this to your own Device IDx
local idxj = 368
local idxk = 369
local idxl = 370




commandArray = {}



sWindDirectionDegrees, sWindDirection, sWindSpeed, sWindGust, sWindTemperature, sWindFeel = otherdevices_svalues['Buienradar - Wind']:match("([^;]+);([^;]+);([^;]+);([^;]+);([^;]+);([^;]+)")
 
sWindDirectionDegrees = tonumber(sWindDirectionDegrees);
sWindDirection = (sWindDirection);
sWindSpeed = tonumber(sWindSpeed);
sWindGust = tonumber(sWindGust);
sWindTemperature = tonumber(sWindTemperature);
sWindFeel = tonumber(sWindFeel);

print("Windmeter: Winddirection (in degrees) is: " .. sWindDirectionDegrees .. " ");
print("Windmeter: Winddirection is: " .. sWindDirection .. " ");
print("Windmeter: Windspeed is: " .. sWindSpeed .. " ");
print("Windmeter: Windgust is: " .. sWindGust .. " ");
print("Windmeter: Windtemperature is: " .. sWindTemperature .. " ");
print("Windmeter: Windfeel is: " .. sWindFeel .. " ");




commandArray[1] = {['UpdateDevice'] = idxt .. '|0|' .. sWindDirectionDegrees}
commandArray[2] = {['UpdateDevice'] = idxh .. '|0|' .. sWindDirection}
commandArray[3] = {['UpdateDevice'] = idxi .. '|0|' .. sWindSpeed}
commandArray[4] = {['UpdateDevice'] = idxj .. '|0|' .. sWindGust}
commandArray[5] = {['UpdateDevice'] = idxk .. '|0|' .. sWindTemperature}
commandArray[6] = {['UpdateDevice'] = idxl .. '|0|' .. sWindFeel}



return commandArray 

Now I would like to run the script only when the "Buienradar" has changed

For that I changed the code to this, but then get an error :
2017-03-18 09:14:00.359 Error: EventSystem: in Buienradar_wind: [string "--Windmeter data: ..."]:17: attempt to index global 'devicechanged' (a nil value)

Code: Select all

--Windmeter data:


local sensoren= 'Buienradar'
local idxt = 365 --idx of the virtual temperature sensor you need to change this to your own Device IDx
local idxh = 366 --idx of the virtual humidity sensor you need to change this to your own Device IDx
local idxi = 367 --idx of the virtual pressure sensor you need to change this to your own Device IDx
local idxj = 368
local idxk = 369
local idxl = 370




commandArray = {}

if devicechanged[sensoren] then

sWindDirectionDegrees, sWindDirection, sWindSpeed, sWindGust, sWindTemperature, sWindFeel = otherdevices_svalues['Buienradar - Wind']:match("([^;]+);([^;]+);([^;]+);([^;]+);([^;]+);([^;]+)")
 
sWindDirectionDegrees = tonumber(sWindDirectionDegrees);
sWindDirection = (sWindDirection);
sWindSpeed = tonumber(sWindSpeed);
sWindGust = tonumber(sWindGust);
sWindTemperature = tonumber(sWindTemperature);
sWindFeel = tonumber(sWindFeel);

print("Windmeter: Winddirection (in degrees) is: " .. sWindDirectionDegrees .. " ");
print("Windmeter: Winddirection is: " .. sWindDirection .. " ");
print("Windmeter: Windspeed is: " .. sWindSpeed .. " ");
print("Windmeter: Windgust is: " .. sWindGust .. " ");
print("Windmeter: Windtemperature is: " .. sWindTemperature .. " ");
print("Windmeter: Windfeel is: " .. sWindFeel .. " ");




commandArray[1] = {['UpdateDevice'] = idxt .. '|0|' .. sWindDirectionDegrees}
commandArray[2] = {['UpdateDevice'] = idxh .. '|0|' .. sWindDirection}
commandArray[3] = {['UpdateDevice'] = idxi .. '|0|' .. sWindSpeed}
commandArray[4] = {['UpdateDevice'] = idxj .. '|0|' .. sWindGust}
commandArray[5] = {['UpdateDevice'] = idxk .. '|0|' .. sWindTemperature}
commandArray[6] = {['UpdateDevice'] = idxl .. '|0|' .. sWindFeel}

end

return commandArray 

I tried several optins for the device name (with and without brackets and or apostrophes, but get everytime this error.
Does someone know what is wrong ?

[jvdz]

Is this an LUA script made in the internal editor? if so change "All" to "Devices" in the dropdownbox under LUA.
This error occurs when an Time event is triggered, which seem to be the case looking at the time of the error.

Jos

[curious]

I changed it to Device. Now the error doesn't show up, but changes are not noticed either.
So the virtual devices are not updated.

[jvdz]

So what is the exact name of the device that changes when the update needs to happen?

Jos

[curious]

The name of device = Buienradar

Buienradar.JPG (25.01 KiB) Viewed 2741 times

[jvdz]

This is the Hardware page ...right?
How does it look under the Devices page?
You can see the actual devicenames and their current content.

Jos

[curious]

The device that was created by installing the plugin is called "Buienradar - Wind"

[img]

Buienradar2.JPG (43.49 KiB) Viewed 2725 times

[/img]

[jvdz]

So guess you need to change this line to the appropriate device name like:

Code: Select all

local sensoren= 'Buienradar - Wind'

EDIT: When you want to be sure about the device names that change you could add this code (from the event wiki) temporary to your script to log them to the domoticz.log file:

Code: Select all

commandArray = {}
 
-- loop through all the changed devices
for deviceName,deviceValue in pairs(devicechanged) do
    print ("Device based event fired on '"..deviceName.."', value '"..tostring(deviceValue).."'");
end
 
return commandArray

Jos