Apple推送通知的有效负载大小无效

Question

我正在尝试使用C＃发送Apple推送通知。我已经设置了代码并且一切正常，除了Apple的响应是说无效的有效载荷大小。我查看了代码，但我没有看到无效大小的来源。下面是我生成要发送的有效负载的代码。我正在使用Moon APNS发送类库发送。任何人都可以提供的任何帮助将非常感激。

 private static byte[] GeneratePayload(NotifcationPayload payload)
        {
            try
            {
                //Convert Device token to HEX value
                byte[] deviceToken = new byte[payload.DeviceToken.Length /2];
                for (int i= 0; i < deviceToken.Length; i++)
                    deviceToken[i] = byte.Parse(payload.DeviceToken.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);

                var memoryStream = new MemoryStream();

                // Command
                memoryStream.WriteByte(1); // Changed command Type

                // Adding ID to Payload
                memoryStream.Write(Encoding.ASCII.GetBytes(payload.PayloadId.ToString()), 0, payload.PayloadId.ToString().Length);

                //Adding Expiration Date to Payload
                int expire = (int) (DateTime.UtcNow.AddMinutes(300) - new DateTime(1970, 1, 1)).TotalSeconds;
                byte[] timeStamp = BitConverter.GetBytes(expire);
                memoryStream.Write(timeStamp, 0 , timeStamp.Length);

                byte[] tokenLength = BitConverter.GetBytes((Int16) 32);
                Array.Reverse(tokenLength);

                //Device Token Length
                memoryStream.Write(tokenLength, 0 ,2);

                //Token
                memoryStream.Write(deviceToken, 0, 32);

                //String length
                string apnMessage = payload.ToJson();
                LogHelper.Info("Payload generated for " + payload.DeviceToken + " : " + apnMessage);

                byte[] apnMessageLength = BitConverter.GetBytes((Int16) apnMessage.Length);
                Array.Reverse(apnMessageLength, 0, 2);
                LogHelper.Info("PushNotification::GeneratePayload : This is the size of the payload " + apnMessageLength);


                //Message Length
                memoryStream.Write(apnMessageLength, 0, 2);

                //Write the Message
                memoryStream.Write(Encoding.ASCII.GetBytes(apnMessage), 0, apnMessage.Length);
                LogHelper.Info("Writethe message " + memoryStream);
                return memoryStream.ToArray();

            }
            catch (Exception ex)
            {
                LogHelper.Error("Unable to generate payload - " + ex.Message);
                return null;
            }
        }