mqtt source MQTT Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

Allows receiving messages from any endpoint that supports the MQTT protocol, such as a message broker.

Configuration Options

The following table summarizes the configuration options available for the mqtt-source Kamelet:

Property Name Description Type Default Example

brokerUrl *

Broker URL

The URL of the broker where to establish the connection

string

"tcp://mosquitto:1883"

topic *

Topic

The topic to subscribe to

string

"mytopic"

clientId

Client ID

The client ID to use when connecting to the resource

string

"mqtt-source"
Fields marked with (*) are mandatory.

Usage

This section summarizes how the mqtt-source can be used in various contexts.

Knative Source

The mqtt-source Kamelet can be used as Knative source by binding it to a Knative object.

mqtt-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: mqtt-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: mqtt-source
    properties:
      brokerUrl: "tcp://mosquitto:1883"
      topic: "mytopic"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

Make sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the mqtt-source-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the source using the following command:

kubectl apply -f mqtt-source-binding.yaml

Dependencies

The Kamelet needs the following dependencies:

  • camel:paho

  • camel:kamelet

Binding to Knative using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

kamel bind mqtt-source -p "source.brokerUrl=tcp://mosquitto:1883" -p "source.topic=mytopic" channel:mychannel

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kafka Source

The mqtt-source Kamelet can be used as Kafka source by binding it to a Kafka topic.

mqtt-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: mqtt-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: mqtt-source
    properties:
      brokerUrl: "tcp://mosquitto:1883"
      topic: "mytopic"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

Ensure that you’ve installed Strimzi and created a topic named my-topic in the current namespace. Make also sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the mqtt-source-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the source using the following command:

kubectl apply -f mqtt-source-binding.yaml

Binding to Kafka using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

kamel bind mqtt-source -p "source.brokerUrl=tcp://mosquitto:1883" -p "source.topic=mytopic" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kamelet source file

Have a look at the following link:

https://github.com/apache/camel-kamelets/blob/main/mqtt-source.kamelet.yaml

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