Let say user A subscribe event source push notification at device A at 10am and subscribe event source push at device B at 11am without unsubscribe. If my backend send the push message, both devices will receive the push message? I actually just want to send the message to the latest devices user have subscribed. Is there anyway to do this?
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2 Answers
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Like Idan suggested you can inspect push subscriptions in the database . Susbscriptions have an associated timestamp entry . With this you can determine the latest one for the user.
You can then use WL.Server.notifyDevice(userSubscription, device, options) or WL.Server.notifyDeviceSubscription(deviceSubscription, notificationOptions) to target a specific device.
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If the user subscribed to two different event sources then yes, the user will receive notifications in both event sources...
There is no built-in mechanism that will prevent "duplicate" subscriptions (of the same user), so perhaps you could implement some sort of a cron job on your server to inspect the subscriptions table in the database and check that there are no duplicate subscriptions. If a duplicate subscription is found, delete the older one.
