Firebase Cloud Messaging (FCM) offers a broad range of messaging options and capabilities.

With FCM, you can send two types of messages to clients:
  • Notification messages, sometimes thought of as "display messages."
  • Data messages, which are handled by the client app.
A notification message is the more lightweight option, with a 2KB limit and a predefined set of user-visible keys. Data messages let developers send up to 4KB of custom key-value pairs. Notification messages can contain an optional data payload, which is delivered when users tap on the notification.

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To schedule/defer a message to a later date/time, swipe from left to right on the message from the inbox view.

You can then defer the message to reappear in your inbox: In a few hours. This evening. Tomorrow morning. or you can choose a custom ti...