Manufacturing Apps reading data from MQTT

[SaranKarthick]

Hi @SebB ,

Per this topic:

We're currently using KepServerEX for the MQTT connection. 

In Kepware we have data tag in which one string item is in the format as shown below.

{
  "customer": "ABC",
  "site": "ABC",
  "department": "ABC",
  "assettype": "A",
  "asset": "A01",
  "description": "Make or Model",
  "tags": [
  
    {
      "component": "PLC",
      "tag": "MachineOn",
      "value": 1,
      "unit": "1/0-Running/Stopped"
    },
    {
      "component": "PLC",
      "tag": "Length",
      "value": 11.99,
      "unit": "km"
    },
    {
      "component": "PLC",
      "tag": "Temperature",
      "value": 45,
      "unit": "C"
    }
     
  ]
}

Since its in this json format i'm unable to use the OOTB Configuration App to directly map Machine status and other properties to the Asset. I've written a Subscription service to parse and map the corresponding properties.

Is there any better workaround for this. Can this heavy lifting part done at kepware side itself.

Regards,

saran 

[SebB · Accepted solution]

Hey @SaranKarthick 

you should be able to get the values out to the JSON string by using the Tag addresses in Kepware.

I never tried it by my self but in the documentation of the MQTT client for Kepware is a example that looks similar what you try to do. https://www.kepware.com/getattachment/b44c89ac-0b3b-4a22-bdd2-fa7873b38f31/mqtt-client-manual.pdf

On page 17, 18 and 19 are examples.

Seb

[SaranKarthick]

Hi @SebB ,

I'm now able to get the values out of json as expected. The guide was very useful. 

Thanks and Regards,

Saran