exclude metadata from the topic when using the standard MQTT topics for shadow operations

Question

$aws/things/thingname/shadow/name/myshadow/get
This get shadow returns the complete payload along with the metadata. Which is useless for me and its also increases the size of the payload. How can I exclude  metadata from the payload?

{
  "metadata": {
    "desired": {
      "welcome": {
        "timestamp": 1699338422
      },
      "OS": {
        "timestamp": 1699989143
      },
      "LS": {
        "timestamp": 1699338423
      },
      "CV": {
        "timestamp": 1699989143
      },
      "MQ": {
        "timestamp": 1699989143
      }
    },
    "reported": {
      "welcome": {
        "timestamp": 1700744111
      },
      "LS": {
        "timestamp": 1700580432
      },
      "OS": {
        "timestamp": 1699988362
      }
    }
  }
}

Answer

Hello,

Inorder to reduce the size of shadow messages sent to your device, define a rule that selects only the fields your device needs then republishes the message on an MQTT topic to which your device is listening. Please refer the below documentation which mentions the same:

[+]. https://docs.aws.amazon.com/iot/latest/developerguide/iot-device-shadows.html#device-shadow-trim-messages

Thanks

exclude metadata from the topic when using the standard MQTT topics for shadow operations

Relevanter Inhalt