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BLEデバイスからデータを読み取る

Bluetoothデバイス（BR-LE4.0-S2）からデータを読み取ろうとしています。 BLEデバイスを接続することはできましたが、データを読み取ることができませんでした。BLEサービスとその特性についての仕様はありません。ここで私の問題は、- (void)peripheral:didUpdateValueForCharacteristic:error:が呼び出されないことです。チュートリアル「 https://developer.Apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/PerformingCommonCentralRoleTasks/PerformingCommonCentralRoleTasks.html#//Apple_ref/doc/uid/TP40013257 -CH3-SW2 "。次は私のコードです。

私の要件は、BLEデバイスからデータを継続的に読み取ることです。どんな助けも大歓迎です。

- (void)viewDidLoad
{
    self.myCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
    self.peripheral = [[CBPeripheral alloc] init];
    self.peripheral.delegate = self;
    [super viewDidLoad];
}

- (void) centralManagerDidUpdateState:(CBCentralManager *)central {

    switch (central.state) {
        case CBCentralManagerStatePoweredOn:
        [self.myCentralManager scanForPeripheralsWithServices:nil options:nil];
            break;
        default:
            NSLog(@"Central Manager did change state");
            break;
    }

}

- (void)centralManager:(CBCentralManager *)central
 didDiscoverPeripheral:(CBPeripheral *)peripheral
     advertisementData:(NSDictionary *)advertisementData
                  RSSI:(NSNumber *)RSSI {

    NSLog(@"Discovered %@", peripheral.name);
    [self.myCentralManager stopScan];
    NSLog(@"Scanning stopped");

    if (self.peripheral != peripheral) {
        self.peripheral = peripheral;
        NSLog(@"Connecting to peripheral %@", peripheral);
        // Connects to the discovered peripheral
    [self.myCentralManager connectPeripheral:peripheral options:nil];
    }
}

- (void)centralManager:(CBCentralManager *)central
didConnectPeripheral:(CBPeripheral *)peripheral {

    NSLog(@"Peripheral connected");

    NSLog(@"Peripheral services : %@",peripheral.services );

    [self.peripheral setDelegate:self];

    [peripheral discoverServices:nil];

}
- (void)peripheral:(CBPeripheral *)peripheral
didDiscoverServices:(NSError *)error {

    if (error) {
        NSLog(@"Error discovering service: %@", [error localizedDescription]);
        return;
    }

    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics:nil forService:nil];
    }
}

- (void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service
             error:(NSError *)error {

    int i = 0;
    for (CBCharacteristic *characteristic in service.characteristics) {

[peripheral setNotifyValue:YES forCharacteristic: characteristic];

    }
}

- (void)peripheral:(CBPeripheral *)peripheral
didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic
             error:(NSError *)error {

    NSData *data = characteristic.value;
    NSString *value = [[NSString alloc] initWithData:characteristic.value encoding:NSUTF8StringEncoding];

    NSLog(@"Value %@",value);
    NSString *stringFromData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSLog(@"Data ====== %@", stringFromData);
}


- (void)peripheral:(CBPeripheral *)peripheral
didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic
             error:(NSError *)error {

    if (error) {
        NSLog(@"Error changing notification state: %@",
              [error localizedDescription]);
    }
    NSString *value = [[NSString alloc] initWithData:self.interestingCharacteristic.value encoding:NSUTF8StringEncoding];

    NSLog(@"Value %@",value);

    NSLog(@"description: %@, descriptors: %@, properties: %d, service :%@, value:%@", characteristic.description, characteristic.descriptors, characteristic.properties, characteristic.service, characteristic.value);
    NSData *data = characteristic.value;

    if (characteristic.isNotifying) {
        NSString *stringFromData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        [peripheral readValueForCharacteristic:characteristic];

        NSLog(@"Data ====== %@", @"ccdc");

    } else {
        [self.myCentralManager cancelPeripheralConnection:peripheral];

    }

}

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    NSLog(@"Peripheral Disconnected");
    self.peripheral = nil;

    // We're disconnected, so start scanning again
    NSDictionary *scanOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];

    [self.myCentralManager scanForPeripheralsWithServices:nil options:scanOptions];
}
iosobjective-ccore-bluetooth
21
Ab'initio

BLE周辺機器から値を読み取るには、次の手順に従います

  1. 利用可能なデバイスをスキャンする

    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
[self.myCentralManager scanForPeripheralsWithServices:nil options:options];`

  2. デバイスを検出すると、「didDiscoverPeripheral」デリゲートメソッドへのコールバックを取得します。次に、検出されたBLEデバイスとの接続を確立します

    -(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {

    //Connect detected device....
    if (!peripheral.isConnected) {
        peripheral.delegate = self;
        [bluetoothManager_ connectPeripheral:peripheral options:nil];

    }
}

  3. 接続に成功したら、BLEデバイスで利用可能なすべてのサービスをリクエストします

    - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
NSLog(@"Peripheral Connected");

    // Make sure we get the discovery callbacks
    peripheral.delegate = self;

    // Search only for services that match our UUID
    [peripheral discoverServices:nil];
}

  4. 各サービスで利用可能なすべての特性を要求する

    - (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {

    if (error) {
        NSLog(@"Error discovering services: %@", [error localizedDescription]);
        return;
    }
    // Loop through the newly filled peripheral.services array, just in case there's more than one.
    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics:nil forService:service];
    }
}

  5. 必要な特性の詳細を取得したら、サブスクライブする必要があります。これにより、含まれているデータが必要であることを周辺機器に知らせることができます。

    - (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{

    // Deal with errors (if any)
    if (error) {
        NSLog(@"Error discovering characteristics: %@", [error localizedDescription]);
        return;
    }

    // Again, we loop through the array, just in case.
    for (CBCharacteristic *characteristic in service.characteristics) {
        if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:REQUIRED_CHARA_ID]]) {
            // If it is, subscribe to it
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
    }
}

  6. これらすべての手順を完了すると、BLEデバイスはデリゲートメソッドを介して通知ステータスの変更を通知します

    - (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{

    if (error) {
        NSLog(@"Error changing notification state: %@", error.localizedDescription);
    }

    // Notification has started
    if (characteristic.isNotifying) {
        NSLog(@"Notification began on %@", characteristic);
    }
}

次の方法でBLEデバイスから通知を受け取ります。

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
    if (error) {
        NSLog(@"Error reading characteristics: %@", [error localizedDescription]);
        return;
    }

    if (characteristic.value != nil) {
          //value here.        
    }
}
72
itZme

Swiftバージョンの itZmeの回答小さな変更 _didConnectToPeripheralが呼び出されないため（あなたも次のように、接続するために周辺機器への強い参照を保持する必要があります）。

利用可能なデバイスをスキャン：

centralManager.scanForPeripheralsWithServices(nil, options: nil)

デバイスを検出すると、「didDiscoverPeripheral」デリゲートメソッドへのコールバックを取得します。その後、検出されたBLEデバイスとの接続を確立します。ただし、最初に周辺機器の強力な参照を保持する：

private var peripherals: [CBPeripheral] = []

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {

  if peripheral.state != .connected {
    self.peripherals.append(peripheral)
    peripheral.delegate = self
    centralManager.connectPeripheral(peripheral , options: nil)
  }
}

残りは次のようになります。

extension ViewController: CBPeripheralDelegate {

func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {

  if error != nil {
    print("Error connecting to peripheral: \(error?.localizedDescription)")
    return
  }
}

func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
print("Peripheral connected.")

  peripheral.delegate = self
  peripheral.discoverServices(nil)
}

func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {

  if error != nil {
    print("Error discovering services \(error?.localizedDescription)")
    return
  }

  for service: CBService in peripheral.services! {
    peripheral.discoverCharacteristics(nil, forService: service)
  }
}

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {

  if error != nil {
    print("Error discovering characteristics \(error?.localizedDescription)")
    return
  }

  for characteristic: CBCharacteristic in service.characteristics! {
    if characteristic.UUID == CBUUID(string: YOUR_CHARACTERISTIC_UUID) {
      peripheral.readValueForCharacteristic(characteristic)
      // for some devices, you can skip readValue() and print the value here
    }
  }
}

func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) {

   if characteristic.UUID == CBUUID(string: YOUR_CHARACTERISTIC_UUID) {
      print(characteristic.value)
    }       
}

}
7
Teodor Ciuraru
  func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {

    for newChar: CBCharacteristic in service.characteristics!{

        peripheral.readValue(for: newChar)

        if newChar.properties.rawValue == 0x10 || newChar.properties.rawValue == 0x8C{

            peripheral.setNotifyValue(true, for: newChar)
        }
        else if newChar.properties.rawValue == 0x12{

            peripheral.setNotifyValue(true, for: newChar)
        }
     }


 func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {

    print(characteristic)
 }
0
Deepak Tagadiya