Lua, Read data from device

[thaui]

Maybe a stupid question but I don't get the temperature value read to use the number in a lue script.

Unbenannt.JPG (17.91 KiB) Viewed 1044 times

if the command = tonumber(otherdevices['Lightsensor_Ost']) >= 107
the protocoll says "attempt to compare number with nil"


Edit Waltervl: Moved from mqttmapper topic as this is a Lua question.

[FlyingDomotic]

Would it be possible to get the full script (or at least lines around the command)?

As written, syntax seems to be strange...

[thaui]

For better explanation. The LUA script was used with a fibaro smart implant device. I got the values from 3 DS18B20 sensors. The system with Fibaro was not stable enough and lost from time to time the sensors. Luckily there is MqttMapper and the Shelly Plus with Addon is providing the data. After adding the device via MqttMapper to Domoticz I only changed the device name to the same names the Fibaro device had.

Here is line 29 of the script. "Lightsensor_Ost" is exactly the same name from Zwave and MqttMapper

if tonumber(otherdevices['Lightsensor_Ost']) >= 107 and tonumber(otherdevices['Wetter Clouds %']) < 41 and uservariables['Shutter_Loop_Ost'] == 0 and otherdevices['Solar_Timer_Ost'] == 'Off' and otherdevices['Sonnensensor_Ost An/Aus'] == 'On' then
commandArray['Solar_Timer_Ost'] = 'On'
commandArray['Variable:Shutter_Loop_Ost'] = '1'
print('Solar_Timer_Ost = AN')

protocoll error
Error: EventSystem: in script_shutter_sun.lua: [string "-- script_shutter_sun.lua ..."]:29: attempt to compare number with nil

[FlyingDomotic]

Could you insert this code just before line 29, in order to see which variable is nil?

Code: Select all

print(otherdevices['Lightsensor_Ost'])
print(otherdevices['Wetter Clouds %'])
print(uservariables['Shutter_Loop_Ost'])
print(otherdevices['Solar_Timer_Ost'])
print(otherdevices['Sonnensensor_Ost An/Aus'])

Getting new error line, you'll be able to tell which is the first valiable set to nil.

[thaui]

here we have the result

2024-08-13 17:20:00.278 Status: LUA: 0.00
2024-08-13 17:20:00.278 Status: LUA: 0
2024-08-13 17:20:00.278 Status: LUA: Off
2024-08-13 17:20:00.278 Status: LUA: On

seems to be the Lightsensor_Ost which generate the problem. No idea why

[thaui]

here we have the device list from MqttMapper

Unbenannt.JPG (34.24 KiB) Viewed 964 times

[FlyingDomotic]

Strange...

What's Domoticz version? MqttMapper version? OS version?

Is it possible to get (part of) MqttMapper json configuration file, I'd like making test here.

[FlyingDomotic]

And a stupid question: why making a light sensor (normally lux) as a temp one?

[thaui]

There are no stupid questions. The Sensor Module I am using is a tiny PCB Board with a lightsensor. The Output is simulating a Ds18B20. So the equivalent Lux value is a temperture. Lux value is calculated Ev=e(temp/10). But this is not the problem. Fibaro smart implant also could only handle DS18B20 temperature Sensors. There is no Lux Sensor on the market which messures up to 100000 lux

I am on Domoticz 2024.4 on a RPI 3 with Bullseye.

part of the Json file
"Lightsensors Ost":{
"topic": "Lightsensors/status/temperature:100",
"type": "80", "subtype":"5",
"mapping":{"item":"tC"}

Mqtt Explorer topic : Lightsensors/status/temperature:100

status = {"id": 100,"tC":85.1, "tF":185.1}
tC is the value in Celsius and tF in Fahrenheit

[waltervl]

Yes but in Domoticz you can just define it as a Lux sensor with MQTT mapper and send the correct value. So then it looks like a lux sensor in Domoticz instead of a temperature sensor which it is not.
Device Type: 246 Subtype: 1 Lux Illumination (sValue: "float")

[thaui]

@waltervl Temperature is fine for me. If I have 93°C I know thats 10200lx .

ost temp.JPG (13.71 KiB) Viewed 899 times

Ost lux.JPG (14.44 KiB) Viewed 899 times

[waltervl]

I dont see a reason why Lua would not be able to read the "Lightsensor_Ost" value.
Are there multiple devices with this name "Lightsensor_Ost" ?

[FlyingDomotic]

I am on Domoticz 2024.4 on a RPI 3 with Bullseye.

part of the Json file
"Lightsensors Ost":{
"topic": "Lightsensors/status/temperature:100",
"type": "80", "subtype":"5",
"mapping":{"item":"tC"}

Mqtt Explorer topic : Lightsensors/status/temperature:100

status = {"id": 100,"tC":85.1, "tF":185.1}
tC is the value in Celsius and tF in Fahrenheit

Are you sure about topic content?

Code: Select all

status = {"id": 100,"tC":85.1, "tF":185.1}

... is not a valid json format, and is interpreted as text by MqttMapper.

To be seen as json, topic should be:

Code: Select all

{"status": {"id": 100,"tC":85.1, "tF":185.1}}

If you can change payload, then do it. If not, we should parse it manually, to extract data with a script. I can provide it if needed.

Unless payload content is only

Code: Select all

{"id": 100,"tC":85.1, "tF":185.1}

In this case, with a 2024.7, on RPi 4 with Buster and MqttMapper 1.0.42, sending payload "{"id": 100,"tC":85.1, "tF":185.1}" to "Lightsensors/status/temperature:100" properly loads data into Domoticz.

LightsensorOst.png (11.13 KiB) Viewed 877 times

LightsensorOst2.png (8.13 KiB) Viewed 877 times

Using the following LUA script

Code: Select all

commandArray = {}

-- loop through all the changed devices
for deviceName,deviceValue in pairs(devicechanged) do
    if (deviceName=='Test MQTT - Lightsensors Ost') then
        print ("Device event fired on '"..deviceName.."', value '"..tostring(deviceValue).."', otherDevices '"..tostring(otherdevices['Test MQTT - Lightsensors Ost']).."'")
    end
end

return commandArray

... I got :

LightsensorOst3.png (2.87 KiB) Viewed 877 times

So, if payload is just {"id": 100,"tC":85.1, "tF":185.1}, we have to found what are the differences between your configuration. If otherdevices is correctly spelled, check for exact device name match (including leading/trailing spaces).

[thaui]

Many thanks for your continues work to find the problem. Sorry I was not clear on the topic content. Maybe the picture gives you the correct response.

mqtt explorer.JPG (28.13 KiB) Viewed 870 times

[FlyingDomotic]

I was imagining that, crossing with other parts of answer, but just wanted to be sure.

So, part to be taken in account is:

Unless payload content is only

Code: Select all

{"id": 100,"tC":85.1, "tF":185.1}

In this case, with a 2024.7, on RPi 4 with Buster and MqttMapper 1.0.42, sending payload "{"id": 100,"tC":85.1, "tF":185.1}" to "Lightsensors/status/temperature:100" properly loads data into Domoticz.

LightsensorOst.png

LightsensorOst2.png

Using the following LUA script

Code: Select all

commandArray = {}

-- loop through all the changed devices
for deviceName,deviceValue in pairs(devicechanged) do
    if (deviceName=='Test MQTT - Lightsensors Ost') then
        print ("Device event fired on '"..deviceName.."', value '"..tostring(deviceValue).."', otherDevices '"..tostring(otherdevices['Test MQTT - Lightsensors Ost']).."'")
    end
end

return commandArray

... I got :

LightsensorOst3.png

So, if payload is just {"id": 100,"tC":85.1, "tF":185.1}, we have to found what are the differences between your configuration. If otherdevices is correctly spelled, check for exact device name match (including leading/trailing spaces).

[thaui]

your test script will generate the follwing error. : EventSystem: in Test.lua: [string "commandArray = {} ..."]:4: bad argument #1 to 'pairs' (table expected, got nil)

[FlyingDomotic]

Could you confirm you're using "simple" LUA, not dzVents? And if "simple" LUA, with "device" type?

I just cut and pasted code properly running in Domoticz to forum.

[thaui]

I updated Domoticz to version 2024.7 and updated MQttMapper to the latest version like in your system. It's running well now. No idea what the reason was. Thanks for your help

[FlyingDomotic]

I made few changes last days and weeks, it was probably MqttMapper the faulty part

[thaui]

Anyhow, great support from your side and a very helpfull tool. Without it it's difficult to get Shelly Mqtt data to Domoticz.