Xamarin / MAUI

        private String retourBLE;

        public event EventHandler RetourBlEMofifiee;

        public String RetourBLE

        {

            get

            {

                return retourBLE;

            }

            set

            {

                if (retourBLE != value)

                {

                    retourBLE = value;

                    OnRetourBLEMofifiee(EventArgs.Empty);

                }

            }

        }

        public void OnRetourBLEMofifiee(EventArgs e)

        {

            RetourBlEMofifiee?.Invoke(this, e);

        }

        public  async Task LectureTag(IDevice deviceConnected)

        {

            try

            {

                String cmd = "READ";

                List<byte> local_frame = new List<byte>();

                CRC crcProcess = new CRC();

                byte local_crc;

                local_frame.Add(BytesPrtc.STX); //add STX byte

                local_frame.Add(BytesPrtc.DST_TX); //add DST byte

                local_frame.Add(BytesPrtc.SRC_TX); //add SRC byte

                for (int i = 0; i < cmd.Length; i++)

                {

                    local_frame.Add((byte)cmd[i]); //add cmd string 

                }

                crcProcess.putBytes(local_frame.ToArray()); //send that buffer (without "the CRC" and ETX bytes !)

                local_crc = crcProcess.getCRC(); //calculate CRC with that buffer

                local_frame.Add(local_crc); //add CRC byte

                local_frame.Add(BytesPrtc.ETX); //add ETX byte

                /////////////////////////////////////////////

                //And now send buffer !

                await characWrite.WriteAsync(local_frame.ToArray());

                await characRead.StartUpdatesAsync();

            }

            catch

            {

                await Application.Current.MainPage.DisplayAlert("Erreur de lecture", "Erreur de lecture du Tag", "OK");

            }

        }