C# Console Application example

Introduction

In this example we are going to create a simple C# console application to communicate with BleuIO using SerialPort. This script can be used to create Bluetooth Low Energy application using C# with BleuIO.

Let’s start

As a first step lets create a new project in visual studio and select C# console application from the list.

Choose a suitable name for your project and paste the following code to Program.cs file.

The source code is available at github.

https://github.com/smart-sensor-devices-ab/bluetooth_low_energy_csharp

using System;
using System.IO.Ports;
using System.Text;

namespace SerialPortExample
{
    class SerialPortProgram
    {
        static SerialPort _port;
        static void Main(string[] args)
        {
            string portName;
            portName = SetPortName();
            _port = new SerialPort(portName,57600, Parity.None, 8, StopBits.One);
            // Instatiate this class
            SerialPortProgram serialPortProgram = new SerialPortProgram();
        }

        private SerialPortProgram()
        {
            _port.DataReceived += new
              SerialDataReceivedEventHandler(port_DataReceived);
            OpenMyPort();
            Console.WriteLine("Type q to exit.");
            bool continueLoop = true;
            string inputCmd;

            while (continueLoop)
            {
                inputCmd = Console.ReadLine();

                if (inputCmd == "q")
                {
                    continueLoop = false;
                    break;
                }
                else
                {
                    byte[] bytes = Encoding.UTF8.GetBytes(inputCmd);
                    var inputByte = new byte[] { 13 };
                    bytes = bytes.Concat(inputByte).ToArray();
                    _port.Write(bytes, 0, bytes.Length);
                }
            }
        }

        private void port_DataReceived(object sender,
          SerialDataReceivedEventArgs e)
        {
            // Show all the incoming data in the port's buffer
            Console.WriteLine(_port.ReadExisting());
        }

        //Open selected COM port
        private static void OpenMyPort()
        {
            try
            {
                _port.Open();
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error opening my port: {0}", ex.Message);
                Environment.Exit(0);
            }
        }

        // Display Port values and prompt user to enter a port.
        public static string SetPortName()
        {
            string portName;

            Console.WriteLine("Available Ports:");
            foreach (string s in SerialPort.GetPortNames())
            {
                Console.WriteLine("   {0}", s);
            }

            Console.Write("Enter COM port value (ex: COM18): ");
            portName = Console.ReadLine();
            return portName;
        }

    }
}

For this script a BleuIO dongle connected to the computer.

When we run the application, it suggests all the available ports on the computer and asks to write the com port number where the BleuIO is connected.

Once we write the correct port number, it starts communicating with BleuIO via SerialPort.

The response of AT commands from the BleuIO will be shown on the screen.

Find the list of available AT commands at BleuIO getting started guide. https://www.bleuio.com/getting_started/docs/commands/

The application will terminate with control+c or type 'q'.