GCM Push Notification with Asp.Net

Question

As you may have seen, Google is migrating its Push Notification System.

http://developer.android.com/guide/google/gcm/c2dm.html

Is there any sample or guide

Answer 1

A while back I had been playing around with C2DM to send push notifications. I altered my code as per changes mentioned on this page: http://developer.android.com/guide/google/gcm/c2dm.html#server to make use for GCM service:

Private Sub btnPush_Click(sender As Object, e As System.EventArgs) Handles btnPush.Click
    lblResponse.Text = SendNotification(AIzaSyB-1uEai2WiUapxCs2Q0GZYzPu7Udno5aA)
End Sub

My SendNotification function:

Private Function SendNotification(ByVal authstring As String) As String
    ServicePointManager.ServerCertificateValidationCallback = Function(sender As Object, certificate As X509Certificate, chain As X509Chain, sslPolicyErrors As SslPolicyErrors) True
    Dim request As WebRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")
    request.Method = "POST"
    request.ContentType = "application/x-www-form-urlencoded"
    request.Headers.Add(String.Format("Authorization: key={0}", authstring))
    Dim collaspeKey As String = Guid.NewGuid().ToString("n")
    Dim postData As String = String.Format("registration_id={0}&data.payload={1}&collapse_key={2}", deviceList.SelectedValue, txtPayload.Text, collaspeKey)
    Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
    request.ContentLength = byteArray.Length
    Dim dataStream As Stream = request.GetRequestStream()
    dataStream.Write(byteArray, 0, byteArray.Length)
    dataStream.Close()
    Dim response As WebResponse = request.GetResponse()
    dataStream = response.GetResponseStream()
    Dim reader As New StreamReader(dataStream)
    Dim responseFromServer As String = reader.ReadToEnd()
    reader.Close()
    dataStream.Close()
    response.Close()

    Return responseFromServer
End Function

It seems that GCM does not require you to authenticate against Google to obtain an auth key (as the case was with C2DM). Instead, you'll require an API key which is being passed to the SendNotification function. This page should help you get your API key set up: http://developer.android.com/guide/google/gcm/gs.html

The code for my web form is below just in case:

    
        Eclipse AVD
        My Phone 1
        My Phone 2
    
    


    
    


    
    

As for creating your Android app to receiving the push notifications, check out this link: http://developer.android.com/guide/google/gcm/gs.html#android-app

Don't forget to import System.Net, System.IO, System.Security.Cryptography.X509Certificates and System.Net.Security.