Lua Script in data to server section

NETWORKING SOLUTIONS
1

I want to upload my plc tags coming via modbus tcp to mqtt by data to server section i also want to add some offset in it so i want to use lua script

but by using following script i am not getting data uploaded on mqtt

In data configuration:
Type: Modbus
Format type: Lua Script
script is: local tag1 = tonumber(data[“Temp”])
local sum = tag1 + 5

In collection configuration:
again
Format type: Lua Script
Script is: { “sum”: “%=return sum%” }

but no data is uploaded to by mqtt platform

Screenshot (12)
Screenshot (12)1920×1200 214 KB

3

Hello,

Could you clarify what the tag1 variable represents? It seems the issue might be in your Lua script’s syntax. Lua uses double square brackets ["key"] instead of curly quotes “key”, so, instead of data[“Temp”], try using data["Temp"] and, in sum’s returning script, { "sum": %=sum% }.

Additionally, is the Modbus data being received on your MQTT client in other JSON or custom formats?

Best regards,

4

Thanks Martynas for reaching out

  1. I have defined tag1 variable to store the value of Temp variable coming from modbus device.
  2. I have tried to replace double quotes with 2 single quotes as per your recommendation but still data is not uploaded
  3. yes data is uploaded to MQTT client in JSON and Custom formats.
5

Any update for this because this steps aren’t working.