Use C# FCM for android push notification

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I am trying to use FCM for pushing notifications to Android device but it seems that I am missing something. These are steps that I've followed

1- Using normal google account, I created new project in https://console.firebase.google.com
2- From Settings -> Cloud Messaging tab, I got Server key and Sender Id
3- I used the bellow code

I always get Mismatch Sender Id error. Am I missing any steps? or do I have to do something on mobile app to match sender id?

What I have tried:

<pre lang="c#">
var regId = "device id";
string SERVER_API_KEY = "Firebase Server key";
        var SENDER_ID = "Sender ID";
        var value = "Test Notification";
        WebRequest tRequest;
        tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
        tRequest.Method = "post";
        tRequest.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
        tRequest.Headers.Add(string.Format("Authorization: key={0}", SERVER_API_KEY));

        tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));

        string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "®istration_id=" + regId + "";
        Console.WriteLine(postData);
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        tRequest.ContentLength = byteArray.Length;

        Stream dataStream = tRequest.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();

        WebResponse tResponse = tRequest.GetResponse();

        dataStream = tResponse.GetResponseStream();

        StreamReader tReader = new StreamReader(dataStream);

        string sResponseFromServer = tReader.ReadToEnd();


        tReader.Close();
        dataStream.Close();
        tResponse.Close();

Posted 17-Jan-17 18:55pm

Ahmedfci_90

Updated 25-Sep-17 3:30am

Afzaal Ahmad Zeeshan

v2

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Ahmedfci_90 · Answer 1 · 2017-01-17T19:51:00

Solution 1

I found the error. As a back-end developer I worked on C# part only. There is one more step to be done from mobile application side. Mobile app should allow receiving messages from list of Sender Ids so the one that I use in my C# code must be allowed from mobile app side. Once I did that it worked

Posted 17-Jan-17 19:51pm

Ahmedfci_90

Comments

giangcs 17-May-17 1:00am

Hi Ahmedfci_90,
Can you share me code example after you fix your problem.
I want to push notification from C# and receive from ionic app but not successful.

T Thamaraiselvan 1-Jun-18 3:12am

If so, can you send the code what you done on mobile app side?

sajidur rahman · Answer 2 · 2017-04-15T21:23:00

You can try following method. I have tested with android .

C#

static void SendMessage()
{
    string serverKey = "Your Server key";

    try
    {
        var result = "-1";
        var webAddr = "https://fcm.googleapis.com/fcm/send";

        var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Headers.Add("Authorization:key=" + serverKey);
        httpWebRequest.Method = "POST";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = "{\"to\": \"Your device token\",\"data\": {\"message\": \"This is a Firebase Cloud Messaging Topic Message!\",}}";
            streamWriter.Write(json);
            streamWriter.Flush();
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            result = streamReader.ReadToEnd();
        }

       // return result;
    }
    catch (Exception ex)
    {
      //  Response.Write(ex.Message);
    }
}

Member 12172000 · Answer 3 · 2017-08-09T23:08:00

public static String SendNotificationFromFirebaseCloud()
{
var result = "-1";
var webAddr = "https://fcm.googleapis.com/fcm/send";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
httpWebRequest.ContentType = "application/json";
httpWebRequest.Headers.Add("Your_Server_Key");
httpWebRequest.Method = "POST";

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{\"to\": \"/topics/news\",\"notification\": {\"body\": \"New news added in application!\",\"title\":\"" + Your_Notif_Title+ "\",}}";
streamWriter.Write(json);
streamWriter.Flush();
}

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
return result;
}

Ashish K Kapoor · Answer 4 · 2017-09-07T03:50:00

 public static String SendNotificationFromFirebaseCloud()
        {
            var result = "-1";
            var webAddr = "https://fcm.googleapis.com/fcm/send";
            var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Headers.Add(HttpRequestHeader.Authorization,"key=Your Key");
            httpWebRequest.Method = "POST";

            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string strNJson = @"{
                    ""to"": ""/topics/ServiceNow"",
                    ""data"": {
                        ""ShortDesc"": ""This is sample"",
                        ""IncidentNo"": ""INC0010438"",
                        ""Description"": ""This is sample""
  },
  ""notification"": {
                ""title"": ""ServiceNow"",
    ""text"": ""Click me to open an Activity!"",
""sound"":""default""
  }
        }";
                streamWriter.Write(strNJson);
                streamWriter.Flush();
            }

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                result = streamReader.ReadToEnd();
            }
            return result;
        }

Ashish K Kapoor · Answer 5 · 2017-09-25T01:33:00

Solution 5

Can you please share your code or mail me.

httpWebRequest.Headers.Add(HttpRequestHeader.Authorization,"key=Your Key");

you have to write key=xxxxxxxx, where xxxxxxxx is your server key.

Posted 25-Sep-17 1:33am

Ashish K Kapoor

Use C# FCM for android push notification

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