.. _google-iot-mqtt-sample:
Google IOT MQTT Sample
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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:
:zephyr_file:`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 :code:`JWT_SIGN_RSA` or :code:`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:
.. code-block: kconfig
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"
See `Google Cloud MQTT Documentation
<https://cloud.google.com/iot/docs/how-tos/mqtt-bridge>`_.
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