Ios does not receive push Notifications

Question

The problem is, in my app the server sends Notifications to users but I don’t know why the devices aren’t receiving notifications.

What I’ve already tested:

Server side sends notifications smoothly (active and correct certificates) and correct and active tokenID on the device.

I used the APN Tester Free app to test sending notifications in Production with the same certificate and in this case it sends and devices receive notifications.

What could be wrong to not be able to receive notifications?

Answer 1

Try that code in C#:

public static void EnviarNotificacaoPush(string tokeDispositivo, string mensagem, string caminhoCertificado, string senhaCertificado)
{
    using (var certificado = new X509Certificate2(File.ReadAllBytes(caminhoCertificado), senhaCertificado))
    {
        var enderecoPushApple = certificado.FriendlyName.StartsWith("Apple Development") ? "gateway.sandbox.push.apple.com" : "gateway.push.apple.com";
        using (var clientTcp = new TcpClient(enderecoPushApple, 2195))
        {
            using (var sslStream = new SslStream(clientTcp.GetStream()))
            {
                sslStream.AuthenticateAsClient(enderecoPushApple, new X509Certificate2Collection(certificado), SslProtocols.Default, false);
                using (var memoryStream = new MemoryStream())
                {
                    using (var writer = new BinaryWriter(memoryStream))
                    {
                        var payload = JsonConvert.SerializeObject(new { aps = new { alert = mensagem } });
                        writer.Write(new byte[] { 0, 0, 32 }.Concat(HexToData(tokeDispositivo)).Concat(new byte[] { 0, (byte)payload.Length }).ToArray());
                        writer.Write(payload.ToCharArray());
                        writer.Flush();
                        sslStream.Write(memoryStream.ToArray());
                        sslStream.Flush();
                    }
                }
            }
        }
    }
}

private static byte[] HexToData(string hexString)
{
    if (hexString.Length % 2 == 1)
        hexString = '0' + hexString;
    var data = new byte[hexString.Length / 2];
    for (int i = 0; i < data.Length; i++)
        data[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
    return data;
}