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Cloud IoT Core Java MQTT example

This sample app publishes data to Cloud Pub/Sub using the MQTT bridge provided as part of Google Cloud IoT Core.

Note that before you can run the sample, you must configure a Google Cloud PubSub topic for Cloud IoT Core and register a device as described in the parent README.

Setup

Run the following command to install the dependencies using Maven:

mvn clean compile

Running the sample

The following command summarizes the sample usage:

mvn exec:java \
    -Dexec.mainClass="com.google.cloud.iot.examples.MqttExample" \
    -Dexec.args="-project_id=my-iot-project \
                 -registry_id=my-registry \
                 -device_id=my-device \
                 -private_key_file=rsa_private_pkcs8 \
                 -algorithm=RS256"

For example, if your project ID is blue-jet-123, your service account credentials are stored in your home folder in creds.json and you have generated your credentials using the generate_keys.sh script provided in the parent folder, you can run the sample as:

mvn exec:java \
    -Dexec.mainClass="com.google.cloud.iot.examples.MqttExample" \
    -Dexec.args="-project_id=blue-jet-123 \
                 -registry_id=my-registry \
                 -device_id=my-device \
                 -private_key_file=../rsa_private_pkcs8 \
                 -algorithm=RS256"

Reading the messages written by the sample client

  1. Create a subscription to your topic.

    gcloud beta pubsub subscriptions create
    projects/your-project-id/subscriptions/my-subscription
    --topic device-events

  2. Read messages published to the topic

    gcloud beta pubsub subscriptions pull --auto-ack
    projects/my-iot-project/subscriptions/my-subscription