[🐛] iOS - onMessage and setBackgroundMessageHandler not triggering

[KongReply]

[🐛] iOS - onMessage and setBackgroundMessageHandler not triggering

[mikehardy]

i receive the notification while the app is in Background or quit but the onMessage or backgroundMessageHandler methods never trigger.

You are sending what appears to be a "mixed" content message. As such the firebase-ios-sdk underlying code will post the notification and the handler in setBackgroundMessageHandler should be called but it has some of it's own requirements - it must be async / has to return a promise or it may not be registered/called, and if the device is in low power mode or has background refresh disabled (https://rnfirebase.io/messaging/usage#ios-background-limitation) then it will not be called

Other than that, not sure why this isn't working for you if those conditions are met. You might watch what happens when the device receives the message via a look at the device log in Console.app to see how iOS and firebase-ios-sdk native code handles the FCM receipt and delivery

[KongReply]

It appears that the problem happened only while working with the emulator while everything works fine on a real device.

Fun fact: removing the APNS header from the notification sent fixed the problem for the emulator, but caused the functions to not trigger with a real device