Sending command to device over internet and getting the response back

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C#

ASP.NET

I want to create a web application that can communicate with my device over internet.The device use Ethernet port for communication.

Previously i have designed a web application that can communicate to weighing scale device over a LAN network.i wanted to know whether the same code can be used to devices over internet or not.We use IP address and port no to communicate to the device .

I have used the given below code for communication.

public string GetScaleWeight(string val1, string val2)//GetWeight contains the code to fetch the weight from the scale//
        {
            try
            {
                Socket sc = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//here we are using socket programming//
                IPAddress ip = IPAddress.Parse(val1);                                                    // to connect to the scale device//
                IPEndPoint dp = new IPEndPoint(ip, int.Parse(val2));
                sc.Connect(dp);
                Byte[] myArray = new Byte[100];
                int value = Convert.ToInt32("5", 16);
                string stringValue = Char.ConvertFromUtf32(value);
                sc.Send(Encoding.ASCII.GetBytes((stringValue)));//passing the hex command to the machine//
                int no = sc.Receive(myArray);//getting the length of the result array//
                string str = System.Text.Encoding.ASCII.GetString(myArray);//getting the result and storing it in a string//
                sc.Close();
                str = str.Substring(0, no);//checking and removing any unwanted garbage value if any //
               return str;
            }
            catch
            {
                return "";
            }
        }  

Can this code be used to communicate to the devices over internet with some modification.
If not Please help on how can we do this.