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Push Notifications

Ably can deliver native push notifications to devices using, amongst others, Apple’s Push Notification service and Google’s Cloud Messaging service. Native push notifications, unlike Ably’s channel based pub/sub messaging, do not require the device to maintain a connection to Ably as the underlying platform or OS is responsible for maintaining its own battery efficient transport to receive push notifications. Therefore, native push notifications are commonly used to display visual notifications to users or launch a background process for an app in a battery efficient manner.

Beta notice

Ably’s push notification service is currently in beta. Please bear in mind:

Delivering push notifications

Ably provides two models for delivering push notifications to devices:

Channel-based broadcasting

The model for delivering push notifications to devices over channels is intentionally very similar to how “normal” messages are delivered using Ably’s pub/sub channel. For example, a “normal” message published on an Ably channel is broadcasted immediately to all subscribers of that channel. When broadcasting push notifications on channels however, the process is the same with the exception that the subscribers (devices receiving push notifications) are registered in advance using our API and the message itself must contain an extra push notification payload that specifies the optional visual format and optional data payload of the native push notification.

Find out more about channel-based push notification broadcasting

Direct publishing

Ably provides a REST API that allows native push notifications to be delivered directly to:

Find out more about direct push notification publishing

Activating a device and receiving notifications

Every device that will receive push notifications must activate itself with the local operating system or framework, and hook into the push notification services that the underlying platform provides. This functionality is platform specific and varies considerably across not just platforms, but also across the push services that operate on those platforms such as GCM and FCM, both of which are available on the Android platform.

The Ably client libraries aim to abstract away this complexity and platform specific behaviour by providing a consistent API for device activation, maintenance of the device registration, subscription to Ably channels for receiving push notifications, and of course for receiving the native push notifications themselves.

Find out more about device activations and subscriptions.

Managing devices and subscriptions

Whilst the realtime client libraries provide APIs for a device to activate itself (via client.push) and subscribe for push notifications (via channel.push), those APIs are intentionally limited to actions pertaining to the device it is run on.

A separate and distinct push admin API is additionally provided in our client libraries specifically designed for use by your servers to facilitate managing and delivering push notifications across all of your registered devices. This API, amongst other things, includes features to manage registered devices, channel subscriptions and deliver push notifications directly.

Find out more about the push admin API.

Platform support

Ably currently supports push notifications on the following platforms:

Apple Push Notifications
supported on all mobile devices running iOS, desktop devices running OS X and Safari
Google Cloud Messaging
supported on all Android and iOS devices, although we use GCM exclusively for Android message delivery
Firebase Cloud Messaging
supported on all Android and iOS devices, although we use FCM exclusively for Android message delivery
Web Push API
supported currently in Chrome, Firefox and Opera browsers. Safari is supported using APN. Please note that push activation and subscription support in our Javascript browser library is coming soon.

Downloading a client library with push support

As Ably’s push notification service is currently in beta, the client libraries currently have varying levels of support for push notifications.

See the list of client libraries with push notification support

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