Subscribe to all messages
Use thesubscribe() method on a channel to receive any messages that are published to it.
The following is an example of subscribing to all messages on a channel:
Subscribe to specific message names
You can subscribe to only messages with specific names:Subscribe to multiple message names
You can register multiple listeners for different message names:Unsubscribe from messages
You can unsubscribe from messages to stop receiving updates:Unsubscribe from specific message names
Working with message data
Messages contain several useful properties:Handling connection state
It’s good practice to handle connection state changes:Handling channel state
Channels also have state that you can monitor:Automatic reattachment
If the connection is lost, the Ably SDK will automatically attempt to reconnect and reattach to channels. Messages published during the disconnection will be delivered once the connection is restored (up to 2 minutes of message history).Next steps
- Learn how to publish messages
- Understand message format and metadata
- Explore message history
- Learn about connection states