home-assistant.io/source/_components/persistent_notification.markdown

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page	Persistent notification	Instructions on how to integrate persistent notifications into Home Assistant.	2016-06-25 10:00	true	false	true	true	home-assistant.png	Other	0.23

The persistent_notification can be used to show a message on the frontend that has to be dismissed by the user.

{% linkable_title Service %}

The service persistent_notification/create takes in message, title, and notification_id.

Service data attribute	Optional	Description
message	no	Body of the notification.
title	yes	Title of the notification.
notification_id	yes	If notification_id is given, it will overwrite the notification if there already was a notification with that ID.

The persistent_notification component supports specifying templates for both the message and the title. This will allow you to use the current state of Home Assistant in your notifications.

In an action of your automation setup it could look like this with a customized subject.

action:
  service: persistent_notification.create
  data:
    message: "Your message goes here"
    title: "Custom subject"

The service persistent_notification/dismiss requires a notification_id.

Service data attribute	Optional	Description
notification_id	no	the notification_id is required to identify the notification that should be removed.

This service allows you to remove a notifications by script or automation.

action:
  service: persistent_notification.dismiss
  data:
    notification_id: "1234"

{% linkable_title Create a persistent notification %}

Choose Services from the Developer Tools to call the persistent_notification service. Select persistent_notification/create from the list of Available services: and enter something like the sample below into the Service Data field and hit CALL SERVICE.

{
  "notification_id": "1234",
  "title": "Sample notification",
  "message": "This is a sample text"
}

This will create the notification entry shown above.