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Google IOT MQTT Sample
Overview
This sample application demonstrates a “full stack” application. This currently is able to
Acquire a DHCPv4 lease.
Connect to an SNTP server and acquire current time
Establish a TLS connection with the Google IOT Cloud servers
Publish data to the Google IOT Cloud
Send/Receive keep alive / pings from cloud server
The source code for this sample application can be found at: samples/net/cloud/google_iot_mqtt.
Requirements
Entropy source
Google IOT Cloud account
Google IOT Cloud credentials and required information
Network connectivity
Building and Running
This application has been built and tested on the NXP FRDMK64F. RSA or ECDSA certs/keys are required to authenticate to the Google IOT Cloud. The application includes a key creation script.
Run the create_keys.py script in the
samples/net/cloud/google_iot_mqtt/src/private_info/ directory.
Be sure that they key type generated (RSA or ECDSA) matches your
config of either JWT_SIGN_RSA or JWT_SIGN_ECDSA.
Users will also be required to configure the following Kconfig options based on their Google Cloud IOT project. The following values come from the Google Cloud Platform itself:
PROJECT_ID: When you select your project at the top of the UI, it should have a “name”, and there should be an ID field as well. This seems to be two words and a number, separated by hyphens.
REGION: The Region shows in the list of registries for your registry. And example is “us-central1”.
REGISTRY_ID: Each registry has an id. This is a string given when creating the registry.
DEVICE_ID: A name given for each device. When viewing the table of devices, this will be shown.
From these values, the config values can be set using the following template:
CLOUD_CLIENT_ID="projects/PROJECT_ID/locations/REGION/registries/REGISTRY_ID/devices/DEVICE_ID"
CLOUD_AUDIENCE="PROJECT_ID"
CLOUD_SUBSCRIBE_CONFIG="/devices/DEVICE_ID/config"
CLOUD_PUBLISH_TOPIC="/devices/DEVICE_ID/state"