How can i publish to a topic in iot core using lambda function?

Question

Hey, i can invoke a lambda function from iot core, but can i trigger a lambda function that can publish to a topic in my iot core endpoint? If i subscribe to this topic in MQTT test client, i should receive the data from the lambda function?
Is it possible? Please share the code.

Answer

Hi,

You can leverage sdk to publish payloads towards a iot core topic.

See below example (https://repost.aws/questions/QUyQP-7Ki6T2202ZHCZ-qkig/questions/QUyQP-7Ki6T2202ZHCZ-qkig/publish-to-iot-endpoint-of-other-account-iotdata-sdk-nodejs-lambda).

```
const iotData = new AWS.IotData({
      endpoint: 'xyz.com', // IoTEndpoint
      credentials: remoteCredentials
    });

const data = await iotData.publish({
      topic: `topicfilter/data/clientId`,
      payload: JSON.stringify({event: 'something'}),
      qos: 1
    }).promise();
```

Documentation: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/IotData.html

Hope it helps ;)

How can i publish to a topic in iot core using lambda function?

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