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I am using the Azure Messaging Component from the Component store, I implemented the code as per the https://components.xamarin.com/gettingstarted/azure-messaging on both iOS and Android, iOS works perfectly however Android does not. The code properly registers the device (I can see that in the Server Explorer – Notification Hub Diagnose window) and receives a registration ID. I then send a test message from the Notification Hub Diagnose window and see the matching registration ID in the Results pane, however the OnMessage override never fires. I have triple checked the connection string elements (which would cause the registration to fail if there were incorrect), I have tried multiple Tags including no tag and the corresponding Broadcast option in the Notification Hub Diagnose Test Send window.
I then happened across the “Sample” attached to the Component, I changed the configuration constants, SenderID, HubName, APIKey and blanked the Tags. (I had to alter the connection string creation as -ns is no longer prefixed) and ran the sample. I received the registration ID as expected and could see it in the Notification Hub, I then sent a test broadcast message (with no tag) and OnMessage never fired.
Just to ensure it wasn’t a configuration issue between the Azure Notification Hub and the GCM, I created a XamAndTest Notification Hub in Azure and a XamAndTest Project in the Google Developer Console. I created an API Key in GCM and enabled the service, I then updated that API Key in the GCM setting on Azure and reran the Xamarin Sample app with these settings and received a registration ID an never got the test message I sent but can see the matching registration ID in the results of the Azure Test Send window. Just for good measure I repeated the same test on the same code and configuration with a Tag and still never received the test message on my device.
I am testing on a Galaxy S5 running Android 5.1, I also tested this on a Samsung Galaxy Tab 8 with Android 5.0 and a Google Nexus 6p running Android 6.0, I observed the exact same behavior on all 3 devices.
I am currently using
Xamarin 126.96.36.199 (0dd817c)
Xamarin.Android 188.8.131.52 (a94a03b)
Xamarin.iOS 184.108.40.206 (3a25bf1)
Azure Messaging Andriod 220.127.116.11
After this exhaustive process, I can only assume this is a bug within the Microsoft.WindowsAzure.Messaging.Android.dll or a problem with the sample code implementation that I cannot identify and resolve to make the Messaging work.
I have the same problem with the basic/vanilla Notification demo program from Xamarin https://developer.xamarin.com/samples/monodroid/RemoteNotifications/
It sends notification successfully (or so it seems) but doesn´t receive the notification back to the device.
Please give us some feedback for this.
Google now recommends using Google Play Services to handle GCM registration. You can see a sample of this here: https://github.com/redth/pushsharp.clientsamples
To register the device's registration id with azure, you should use the Azure Mobile Client SDK which contains a managed implementation for registering devices with notification hubs: https://components.xamarin.com/view/azure-mobile-client
The Azure Messaging component has been delisted and deprecated in favour of the new libraries.