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Integrate with Confluent Cloud

In this article, we will simulate temperature and humidity data and report these data to EMQX Cloud via the MQTT protocol and then use the EMQX Cloud Data Integrations to bridge the data into Confluent Cloud.

Before you start, you need to complete the following operations:

  • A deployment (EMQX Cluster) has been created on EMQX Cloud.

  • For Professional Plan users: Please complete Peering Connection Creation first, all IPs mentioned below refer to the internal network IP of the resource.(Professional Plan with a NAT gateway can also use public IP to connect to resources).

  • For BYOC Plan users: Please establish a peering connection between the VPC where BYOC is deployed and the VPC where the resources are located. All IPs mentioned below refer to the internal IP of the resources. If you need to access the resources via public IP addresses, please configure a NAT gateway in your public cloud console for the VPC where BYOC is deployed.

Confluent Cloud Configuration

Create a cluster

  • Login to the Confluent Cloud console and create a cluster.

  • At this time, we select the dedicated cluster as an example.


  • Select region/zones (make sure the deployment region matches the region of the Confluent Cloud)


  • Select VPC Peering for the networking so this cluster could be accessed only by vpc peering connection.


  • Specify a CIDR block for the cluster and click Conttinue

  • Based on your needs, choose the way to manage the encryption key


  • After binding the card, you are ready to launch the cluster

Manage the cluster using Confluent Cloud CLI

Now that you have a cluster up and running in Confluent Cloud, you can manage it using the Confluent Cloud CLI. Here are some basic commands that you could use with Confluent Cloud CLI.

Install the Confluent Cloud CLI

curl -sL --http1.1 | sh -s -- -b /usr/local/bin

If you already have the CLI installed, you could update it by:

confluent update

Log in to your account

confluent login --save

Select the environment

confluent environment use env-xxxxx

Select the cluster

confluent kafka cluster use lkc-xxxxx

Use an API key and secret

If you have an existing API key that you'd like to use, add it to the CLI by:

confluent api-key store --resource lkc-xxxxx
Key: <API_KEY>
Secret: <API_SECRET>

If you don't have the API key and secret, you can create one by:

confluent api-key create --resource lkc-xxxxx

After add them to teh CLI, you could use the API key and secret by:

confluent api-key use "API_Key" --resource lkc-xxxxx

Create a topic

confluent kafka topic create <topic-name>

You could check the topic list by:

confluent kafka topic list

Produce messages to the topic

confluent kafka topic produce <topic-name>

Consume messages from the topic

confluent kafka topic consume -b <topic-name>

Build VPC Peering Connection with the deployment

After the cluster has been created, we should add peering

  • Go to the Networking section of the Cluster settings page and click on the Add Peering button.


  • Fill in the vpc information. (You could get the information from VPC Peering section of the deployment console)



  • When the connection status is Inactive, go back to the deployment console to accept the peering request. Fill in the vpc information of the confluent cloud cluster and click Confirm. When the vpc status turns to running, you successfully create the vpc peering connection.


Deployment Data Integrations Configuration

Go to the Data Integrations page

  1. Create kafka resources and verify that they are available.

    On the data integration page, click kafka resources, fill in the kafka connection details, and then click test. Please check the kafka service if the test fails. create resource

  2. Click the New button after the test is passed, and you will see the Create Resource successfully message.


  3. Create a new rule

    Put the following SQL statement in the SQL input field. The device reporting message time (up timestamp), client ID, and message body (Payload) will be retrieved from the temp hum/emqx subject in the SQL rule, and the device ambient temperature and humidity will be read from the message body.

    timestamp as up_timestamp, 
    clientid as client_id, 
    payload.temp as temp,
    payload.hum as hum

    rule sql

  4. Rule SQL Testing

    To see if the rule SQL fulfills our requirements, click SQL test and fill in the test payload, topic, and client information.

    rule sql

  5. Add Action to Rule

    Click Next to add a Kafka forwarding action to the rule once the SQL test succeeds. To demonstrate how to bridge the data reported by the device to Kafka, we'll utilize the following Kafka topic and message template.

    # kafka topic
    # kafka message template 
    {"up_timestamp": ${up_timestamp}, "client_id": ${client_id}, "temp": ${temp}, "hum": ${hum}}

    rule sql

  6. After successfully binding the action to the rule, click View Details to see the rule sql statement and the bound actions.


  7. To see the created rules, go to Data Integrations/View Created Rules. Click the Monitor button to see the detailed match data of the rule.



  1. Use MQTTX to simulate temperature and humidity data reporting

    You need to replace with the created deployment connection address, add client authentication information to the EMQX Dashboard. MQTTX

  2. View data bridging results

    # Go to the confluent peering server and view the emqx topic
    confluent kafka topic consume -b emqx