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Error in LUA timer-event: "attempt to index global 'time"

https://forum.domoticz.com/viewtopic.php?t=27861

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Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 8:25
by HansR
I have the code below in a timer event (name is Weather) which belongs to weatherstation (but is not in de linked thread). I reduced the code such that all comment and some unwanted code is taken out but I still get the following errors:
2019-05-09 08:19:00.444 Error: EventSystem: in Weather: [string " local domo_ip = "192.168.178.5:8080..."]:30: attempt to index global 'time' (a nil value)
And I really have no idea where to go from here.
Any clue what is happening and why this error occurs?

Code: Select all

    local domo_ip       = "192.168.178.5:8080"
    local weerstation   = 31                  
    local api_key       = "myKey"
    local debug         = 1
    local language      = "nl"

    local dev_DewPoint      = "Dauwpunt"
    local dev_CloudCover    = "Bewolkingsgraad"
    local dev_UV            = "UV"
    local dev_Ozone         = "Ozon"

    function UpdateDev(device,nvalue,svalues)
        print("UpdateDev "..device..'/'..nvalue..'/'..svalues)
        
        commandArray[#commandArray+1] = {['UpdateDevice'] = otherdevices_idx[device]..'|'..tostring(nvalue)..'|'..tostring(svalues)}
    end
    
    function round(num, dec)
        if num == 0 then
            return 0
        else
            local mult = 10^(dec or 0)
            return math.floor(num * mult + 0.5) / mult
        end
    end

    if  ((time.min+2)%5)==0  then
        json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
        local config=assert(io.popen('curl "http://'..domo_ip..'/json.htm?type=settings"'))
        local Stringjson = config:read('*all')
        config:close()
        local jsonData = json:decode(Stringjson)

        lat          = jsonData.Location.Latitude
        lon          = jsonData.Location.Longitude
        local coord = lat..","..lon
        print("Darksky function coordinates"..coord)
     
        json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
        local config=assert(io.popen('curl "https://api.darksky.net/forecast/'..api_key..'/'..coord..'?lang='..language..'&units=si&exclude=hourly,flags"'))
        local Stringjson = config:read('*all')
        config:close()
        local jsonData = json:decode(Stringjson)

        if jsonData ~= nil then
            val_UV          = jsonData.currently.uvIndex
            val_Ozone       = jsonData.currently.ozone
            val_DewPoint    = round(jsonData.currently.dewPoint,1)
            val_CloudCover  = jsonData.currently.cloudCover*100
        end
        
        if debug==1 then
            print("Bewolkingsgraad : "..val_CloudCover.. " %")
            print("UV-kracht :"..val_UV)
            print("Ozone : De ozone-waarde is "..val_Ozone) 
            print("Dauwpunt : "..val_DewPoint.. " °C")
        end
        
        UpdateDev(dev_CloudCover,0,val_CloudCover)
        UpdateDev(dev_DewPoint,0,val_DewPoint)
        UpdateDev(dev_UV,0,val_UV..";0")
        UpdateDev(dev_Ozone,0,val_Ozone)
     
        if debug==1 then
            print ("Dauwpunt: "..val_DewPoint.." °C")
            print ("Bewolkingsgraad: "..val_CloudCover.." %")
            print ("UV-Index: "..val_UV)
            print ("Ozone: "..val_Ozone)
        end
    end

Re: Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 9:07
by waaren
HansR wrote: ↑Thursday 09 May 2019 8:25 I have the code below in a timer event (name is Weather) which belongs to weatherstation (but is not in de linked thread). I reduced the code such that all comment and some unwanted code is taken out but I still get the following errors:
I don''t see in your code snippet where the Lua table 'time' is declared and filled. Somewhere in your code you should include something like

Code: Select all

local time = os.date("*t")
The url you included points to a dzVents script.
dzVents is build on Lua using Lua code therefore you can include Lua code in dzVents scripts but you cannot use dzVents functions or methods in standard Lua. By the looks of it, it seems that you try to mix the two. Using standard Lua in domoticz requires a

Code: Select all

return  commandArray
to end the script

Re: Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 9:23
by HansR
I modified the code according to your remarks (see new code below) but I keep getting:
2019-05-09 09:18:01.357 Error: EventSystem: in Weather: [string " local domo_ip = "192.168.178.5:8080..."]:15: attempt to get length of global 'commandArray' (a nil value)
And btw: maybe there is an uodate to the script I originally copied from here in which case I could go from there.

Code: Select all

    local domo_ip       = "192.168.178.5:8080"
    local weerstation   = 31                  
    local api_key       = "f338a6dd148e62699842f0f604cca3e8"
    local debug         = 1
    local language      = "nl"

    local dev_DewPoint      = "Dauwpunt"
    local dev_CloudCover    = "Bewolkingsgraad"
    local dev_UV            = "UV"
    local dev_Ozone         = "Ozon"

    function UpdateDev(device,nvalue,svalues)
        print("UpdateDev "..device..'/'..nvalue..'/'..svalues)
        
        commandArray[#commandArray+1] = {['UpdateDevice'] = otherdevices_idx[device]..'|'..tostring(nvalue)..'|'..tostring(svalues)}
    end
    
    function round(num, dec)
        if num == 0 then
            return 0
        else
            local mult = 10^(dec or 0)
            return math.floor(num * mult + 0.5) / mult
        end
    end

    time = os.date("*t")

    if  ((time.min+2)%5)==0  then
        json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
        local config=assert(io.popen('curl "http://'..domo_ip..'/json.htm?type=settings"'))
        local Stringjson = config:read('*all')
        config:close()
        local jsonData = json:decode(Stringjson)

        lat          = jsonData.Location.Latitude
        lon          = jsonData.Location.Longitude
        local coord = lat..","..lon
        print("Darksky function coordinates"..coord)
     
        json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
        local config=assert(io.popen('curl "https://api.darksky.net/forecast/'..api_key..'/'..coord..'?lang='..language..'&units=si&exclude=hourly,flags"'))
        local Stringjson = config:read('*all')
        config:close()
        local jsonData = json:decode(Stringjson)

        if jsonData ~= nil then
            val_UV          = jsonData.currently.uvIndex
            val_Ozone       = jsonData.currently.ozone
            val_DewPoint    = round(jsonData.currently.dewPoint,1)
            val_CloudCover  = jsonData.currently.cloudCover*100
        end
        
        if debug==1 then
            print("Bewolkingsgraad : "..val_CloudCover.. " %")
            print("UV-kracht :"..val_UV)
            print("Ozone : De ozone-waarde is "..val_Ozone) 
            print("Dauwpunt : "..val_DewPoint.. " °C")
        end
        
        UpdateDev(dev_CloudCover,0,val_CloudCover)
        UpdateDev(dev_DewPoint,0,val_DewPoint)
        UpdateDev(dev_UV,0,val_UV..";0")
        UpdateDev(dev_Ozone,0,val_Ozone)
     
        if debug==1 then
            print ("Dauwpunt: "..val_DewPoint.." °C")
            print ("Bewolkingsgraad: "..val_CloudCover.." %")
            print ("UV-Index: "..val_UV)
            print ("Ozone: "..val_Ozone)
        end
    end

    return  commandArray

Re: Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 10:50
by HansR
OK, I found the solution, my devices are updated correctly.
Thnx for getting me on track.

The first line of the timer event must be:

Code: Select all

commandArray={}
The last line of the code must be:

Code: Select all

return commandArray
This is not self-evident for starters in Domoticz / Events coding in the absent of a starting / code templates location. Wouldn't that be a good idea? Or does it already exist in some hidden place?

Re: Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 11:40
by waaren
HansR wrote: ↑Thursday 09 May 2019 10:50 This is not self-evident for starters in Domoticz / Events coding in the absent of a starting / code templates location. Wouldn't that be a good idea? Or does it already exist in some hidden place?
It's there ! Just go to the event editor within domoticz, - choose a script type by pressing the plus, choose the trigger and you are good to go.

hidden ~= (ICanNotFindIT) :D

Re: Error in LUA timer-event: "attempt to index global 'time"

Posted: Thursday 09 May 2019 13:43
by HansR
Found it. That really helps, thnx.
Making the first steps and finding your way is always the hardest of times :))
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