implemented reading only amount of bytes communicated via Usb Hid

MultiTerm.Protocols/UsbHid/UsbHidProtocol.cs

@@ -99,10 +99,12 @@ public class UsbHidProtocol : CommunicationProtocol
             // any data received?
             if (readData.Length > 0)
             {
-                foreach (var readByte in readData)
+                var dataArray = readData.ToArray();
+                var payloadLength = dataArray[1];
+                for (int i = 2; i < (payloadLength + 2); i++)
                 {
                     // report new byte with event
-                    this.OnReceivedData(new ExtendedByte((byte)readByte));
+                    this.OnReceivedData(new ExtendedByte(dataArray[i]));
                 }
             }
         }