Dynamically create AWS IoT topic

Question

Is it possible to create a AWS IoT topic dynamically .

For example, Is it possible to set a RULE where once the message is received, It creates a topic dynamically or through lambda function.

Or is it possible through AWS-SDK

Any suggestion would be helpful

Trustee

What have you tried so far to get this working? – Eucken

Answer 1

You don't have to explicitly "create" topics in AWS IoT (MQTT). You would simply subscribe to, or start posting to a topic and if the topic doesn't already exist the IoT service will create it automatically.

Gild

The message broker uses topics to route messages from publishing clients to subscribing clients. The forward slash (/) is used to separate topic hierarchy. Ref: docs.aws.amazon.com/iot/latest/developerguide/topics.html – Claro

Answer 2

If I got your question, this is how I am doing whit lambdas:

const AWS = require('aws-sdk')
const iotdata = new AWS.IotData({endpoint: xxxxxxxxxx})

const publishMqtt = (params) =>
  new Promise((resolve, reject) =>
  iotdata.publish(params, (err, res) => resolve(res)))


module.exports.publishMQTT = async event => {
...
let someTopic1 = 'foo'
let someTopic2 = 'bar'
...
    var params = {
        topic: `topicTest/${someTopic1}/${someTopic12}`,
        payload: '{"aaa":"bbb"}',
        qos: '0'
    };

    await publishMqtt(params)
...
}

Vharat