자마린에서 블루투스 연결하기

1. Nuget 에서 Plugin.BLE 설치하기.

 

 

2. 블루투스 연결 가능인지 확인하기.

public bluetooth()         {             IBluetoothLE ble;             ble = CrossBluetoothLE.Current;             var state = ble.State;  //state 는 여러가지가 있으니 확인.             if (state.ToString() != "On")             {                 displayNotice();             }             ble.StateChanged += (s, e) =>             {                 if(e.NewState.ToString() != "On")                 {                     displayNotice();                 }             };         }         private async void displayNotice()         {             await DisplayAlert("알림", "블루투스가 꺼져 있습니다. 블루투스를 켜주세요.", "확인");         }

 

3. Scan

IAdapter adapter = CrossBluetoothLE.Current.Adapter;                 adapter.DeviceDiscovered += (s, a) =>                 {                     IDevice fdev = deviceList.Find(x => x.Id == a.Device.Id);                     if (fdev == null)                     {                         // 중복된 ID가 아니라면, 리스트에 추가.                         deviceList.Add(a.Device);                     }                 };                 adapter.ScanTimeout = 5000;                 await adapter.StartScanningForDevicesAsync();

4. Connect

public IDevice devToCon; //connect 하려고 하는 device 값을 넣어준다.                 try                 {                     await adapter.ConnectToDeviceAsync(devToCon);                 }                 catch (DeviceConnectionException err)                 {                     //specific                     await DisplayAlert("연결 실패 !", err.Message, "확인");                 }                 catch (Exception err)                 {                     await DisplayAlert("Error!", err.Message, "확인");                 }

5. UUID 얻어오기.

  UUID 에 대한 자세한 정보는 여기서. https://www.bluetooth.com/specifications/assigned-numbers/

public IDevice curDev; //연결된 device. public static ICharacteristic sendCharacteristic = null; public static ICharacteristic receiveCharacteristic = null; ..... {     var services = await curDev.GetServicesAsync();     if (services != null)     {         for (int i = 0; i < services.Count; i++)         {             var service = await curDev.GetServiceAsync(services[i].Id);  //service 정보를 확인하고, 필요한 것만 사용             if (service != null)             {                 var characteristics = await service.GetCharacteristicsAsync();                 if (characteristics != null)                 {                     for (int j = 0; j < characteristics.Count; j++)                     {                         var characteristic = await service.GetCharacteristicAsync(characteristics[j].Id);                         if (characteristic != null)                         {                             var cid = characteristic.Id.ToString().Substring(0, 8);                             if (cid == "0000fff1")  // ID "0000fff1" 이 receive ID로 사용될 경우.                             {                                 if (receiveCharacteristic == null)                                 {                                     receiveCharacteristic = characteristic;                                 }                             }                             if (cid == "0000fff2") // ID "0000fff2" 가 send ID로 사용될 경우.                             {                                 if (sendCharacteristic == null)                                 {                                     sendCharacteristic = characteristic; // send                                  }                             }                         }                     }                 }             }         }     } }

6. Recieve data

receiveCharacteristic.ValueUpdated += async (o, args) => {     var receivedBytes = args.Characteristic.Value;     XamarinEssentials.MainThread.BeginInvokeOnMainThread(() =>     {         // receivedBytes 값 처리.         for (int r = 0; r < receivedBytes.Length; r++)         {             message2.Text += receivedBytes[r].ToString("X2");         }     }); }; await receiveCharacteristic.StartUpdatesAsync();

7. Send data

Byte[] sendBytes = new Byte[5]; ..... var bytes = await sendCharacteristic.WriteAsync(sendBytes);