iOS + FCM: Silent notifications require content_available = true

[andreszs]

Expected Behaviour

Notifications without the notification field in the payload should be parsed normally, because we are sending data instead.

Actual Behaviour with app in FOREGROUND

The on('notification') event handler is not called when a silent notification is received. Only when adding content_available = true to the payload, the notification will be handled.

Reproduce Scenario (including but not limited to)

iOS with FCM

Steps to Reproduce

Send this payload and it will be ignored:

{
   "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
   "data" : {
     "Nick" : "Mario",
     "body" : "great match!",
     "Room" : "PortugalVSDenmark"
   },
 }

Platform and Version (eg. Android 5.0 or iOS 9.2.1)

iOS 11.4

Cordova CLI version and cordova platform version

cordova 7.1.0
cordova-ios 4.5.4

Plugin version

2.2.3

Sample Push Data Payload (that works)

This notification will be handled properly.

{
   "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
   "content_available" : true,
   "data" : {
     "Nick" : "Mario",
     "body" : "great match!",
     "Room" : "PortugalVSDenmark"
   },
 }

Suggested Solution

Please update the README to reflect this information because it barely says anything about FCM notifications. Notice that the GCM service is to be shutdown on April 2019.

[macdonst]

@andreszs thanks for the heads up and feel free to send a PR to the docs.

[ramon-dejesus]

@andreszs thanks, this fixed my issue, server side!!!

[ramon-dejesus]

@macdonst I added a PR to close this issue up! :)

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