Unknown Error Occurs on Topic Subscription

[yu840915]

Firebase version: 3.15.0
Firebase Messaging version: 1.2.2
iOS version: 9+
Xcode version: 8.2.1
I have tried to subscribe to a topic named something like sport|baseball and since the SDK only allows [a-zA-Z0-9-_.~%], I encoded the name into sport%7Cbaseball. This works on Android; however, on iOS, it doesn't work. It showed following message on debugger

 <FIRMessaging/WARNING> Failed to subscribe to topic Error Domain=com.google.fcm Code=0 "(null)"

and messages could not arrive.
Currently, our workaround is replacing | with _.

[rsattar]

Apologies for the late response, this is fixed in firebase/firebase-ios-sdk#220, and should be out in an upcoming release of Firebase.

If you have more bugs to file about the SDK itself, please file them at https://github.com/firebase/firebase-ios-sdk/issues, instead of in quickstart-ios. Thanks! 👍