There is no built-in way to target a specific version of the app when sending messages through the FCM API. If you want to send messages to users of a specific version, you could set up a topic for each app version:
v1.0
v1.1
v2.0
...
So with that you can target users of a specific version.
If you want to send a message to all users that are not on the latest version, you can target them with a condition like this (if v2.0
is the latest version):
!('v2.0' in topics)
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