home-assistant.io/source/_integrations/google_pubsub.markdown
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Google Pub/Sub Setup for Google Pub/Sub integration google-pubsub.png
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The google_pubsub integration allows you to hook into the Home Assistant event bus and send events to Google Cloud Pub/Sub. The current free tier of GCP should allow you to sync about 1 event every 2 seconds on average (2 million invocations per month).

First time setup

This assumes you already have a Google Cloud project. If you don't, please create one in the Google Cloud Console

You need to create a Service Account key in the Google Cloud API Console

  • Choose a new "New Service Account", give it a name and leave the key type as JSON
  • Select the role: Pub/Sub Publisher

This will download the Service Account JSON key to your machine. Do NOT share this with anyone. Place this file in your Home Assistant configuration folder.

Next, create a Google Pub/Sub topic in the Google Cloud API Console. The topic name will become something like projects/project-198373/topics/topic-name. Note the last part only (the name you chose): topic-name.

Configuration

Add the following lines to your configuration.yaml file:

# Example configuration.yaml entry
google_pubsub:
  project_id: YOUR_PROJECT_ID
  topic_name: YOUR_TOPIC_NAME
  credentials_json: CREDENTIALS_FILENAME

{% configuration %} project_id: description: Project ID from the Google console (looks like words-2ab12). required: true type: string topic_name: description: The Pub/Sub relative topic name (looks like hass). required: true type: string credentials_json: description: The filename of the Google Service Account JSON file. required: true type: string filter: description: Filter domains and entities for Google Cloud Pub/Sub. required: true type: map keys: include_domains: description: List of domains to include (e.g., light). required: false type: list exclude_domains: description: List of domains to exclude (e.g., light). required: false type: list include_entities: description: List of entities to include (e.g., light.attic). required: false type: list exclude_entities: description: List of entities to include (e.g., light.attic). required: false type: list {% endconfiguration %}

Not filtering domains or entities will send every event to Google PubSub, thus hitting the free tier limit very fast. Be sure to fill in this configuration parameter or have a paid subscription for Google Cloud.

Saving the data using a Google Cloud Function

To save your data automatically to BigQuery, follow the instructions here. The current free tier of GCP should allow to store up to 10GB of data.