Google Pub/Sub

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

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.

Next, 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.

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

Configure Filter

By default, no entity will be excluded. To limit which entities are being exposed to Google Pub/Sub, you can use the filter parameter.

# Example filter to include specified domains and exclude specified entities
google_pubsub:
  project_id: YOUR_PROJECT_ID
  topic_name: YOUR_TOPIC_NAME
  credentials_json: CREDENTIALS_FILENAME
  filter:
    include_domains:
      - alarm_control_panel
      - light
    include_entity_globs:
      - binary_sensor.*_occupancy
    exclude_entities:
      - light.kitchen_light

Filters are applied as follows:

1. No filter
   • All entities included
2. Only includes
   • Entity listed in entities include: include
   • Otherwise, entity matches domain include: include
   • Otherwise, entity matches glob include: include
   • Otherwise: exclude
3. Only excludes
   • Entity listed in exclude: exclude
   • Otherwise, entity matches domain exclude: exclude
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise: include
4. Domain and/or glob includes (may also have excludes)
   • Entity listed in entities include: include
   • Otherwise, entity listed in entities exclude: exclude
   • Otherwise, entity matches glob include: include
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise, entity matches domain include: include
   • Otherwise: exclude
5. Domain and/or glob excludes (no domain and/or glob includes)
   • Entity listed in entities include: include
   • Otherwise, entity listed in exclude: exclude
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise, entity matches domain exclude: exclude
   • Otherwise: include
6. No Domain and/or glob includes or excludes
   • Entity listed in entities include: include
   • Otherwise: exclude

The following characters can be used in entity globs:

* - The asterisk represents zero, one, or multiple characters ? - The question mark represents a single character

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.