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README.md

Cloud IoT Core Java Command Sample

Open in Cloud Shell

This sample app demonstrates sending a command to a Cloud IoT Core device.

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

Before running the samples, you can set the GOOGLE_CLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS environment variables to avoid passing them to the sample every time you run it.

Setup

Run the following command to install the libraries and build the sample with Maven:

mvn clean compile assembly:single

Running the sample

The following description summarizes the sample usage:

usage: DeviceRegistryExample [--cloud_region <arg>] --command <arg>
       [--data <arg>] [--device_id <arg>] [--project_id <arg>]
       [--registry_name <arg>]
Cloud IoT Core Commandline Example (Device / Registry management):

    --cloud_region <arg>    GCP cloud region.
    --command <arg>         Command to run:
                            send-command
    --data <arg>            The command data (string or JSON) to send to
                            the specified device.
    --device_id <arg>       Name for your Device.
    --project_id <arg>      GCP cloud project name.
    --registry_name <arg>   Name for your Device Registry.

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 shell script provided in the parent folder, you can run the sample as:

mvn exec:java \
  -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
  -Dexec.args="-project_id=blue-jet-123 \
               -registry_name=your-registry-id \
               -device_id=your-device-id \
               -command=send-command \
               -data=hello"

Cloud IoT Core Java MQTT Command example

This sample app receives commands sent by the command app.

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:

usage: DeviceRegistryExample [--cloud_region <arg>] --command <arg>
       [--command_data <arg>] [--device_id <arg>] [--project_id <arg>]
       [--registry_name <arg>]
Cloud IoT Core Commandline Example (Device / Registry management):

    --cloud_region <arg>    GCP cloud region.
    --command <arg>         Command to run:
                            send-command
    --command_data <arg>    The command data (string or JSON) to send to
                            the specified device.
    --device_id <arg>       Name for your Device.
    --project_id <arg>      GCP cloud project name.
    --registry_name <arg>   Name for your Device Registry.

For example, if your project ID is blue-jet-123, your device registry is located in the asia-east1 region, 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.example.cloud.iot.examples.MqttExample" \
    -Dexec.args="-project_id=blue-jet-123 \
                 -registry_id=my-registry \
                 -cloud_region=asia-east1 \
                 -device_id=my-device \
                 -private_key_file=../rsa_private_pkcs8 \
                 -algorithm=RS256"