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Daten vom BLE-Gerät lesen

Ich versuche, Daten von einem Bluetooth-Gerät (BR-LE4.0-S2) zu lesen. Ich konnte ein BLE-Gerät anschließen, aber keine Daten daraus lesen. Ich habe keine Angaben zu den BLE-Diensten und deren Eigenschaften. Hier ist mein Problem, dass - (void)peripheral:didUpdateValueForCharacteristic:error: nicht aufgerufen wird. Ich folgte Tutorial „_ ​​ https://developer.Apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/PerformingCommonCentralRoleTasks/PerformingCommonCentralRoleTasks.html#//Apple_ref/doc/uid/TP40013257-CH3-SW2 ".Folgend ist mein Code.

Was meine Anforderung ist, Daten kontinuierlich von BLE-Gerät zu lesen. Jede Hilfe wird sehr geschätzt.

- (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];
}
21
Ab'initio

Gehen Sie folgendermaßen vor, um einen Wert von einem BLE-Peripheriegerät zu lesen

  1. Suchen Sie nach verfügbaren Geräten 

    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
    [self.myCentralManager scanForPeripheralsWithServices:nil options:options];`
    
  2. Beim Erkennen eines Geräts wird ein Aufruf an die Delegatenmethode "didDiscoverPeripheral" zurückgegeben. Stellen Sie dann eine Verbindung mit dem erkannten BLE-Gerät her

    -(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. Fordern Sie bei erfolgreicher Verbindung alle im BLE-Gerät verfügbaren Dienste an

    - (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. Fordern Sie alle in den einzelnen Diensten verfügbaren Merkmale an

    - (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. Sobald wir die Details der erforderlichen Merkmale erhalten haben, müssen wir sie abonnieren, wodurch das Peripheriegerät weiß, dass wir die darin enthaltenen Daten wünschen 

    - (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. Wenn Sie alle diese Schritte ausführen, informiert Sie das BLE-Gerät über die Benachrichtigungsstatusänderung über die Delegatmethode

    - (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);
        }
    }
    

Sie erhalten alle Benachrichtigungen vom BLE-Gerät auf folgende Weise 

- (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.        
    }
}
71
itZme

Swift -Version von itZme's answer mit einer kleinen Modifikation, weil didConnectToPeripheral nicht aufgerufen wird (Sie müssen außerdem einen starken Bezug zu den Peripheriegeräten halten, um eine Verbindung herzustellen):

Suche nach verfügbaren Geräten:

centralManager.scanForPeripheralsWithServices(nil, options: nil)

Beim Erkennen eines Geräts wird ein Aufruf an die Delegatenmethode "didDiscoverPeripheral" zurückgegeben. Stellen Sie dann eine Verbindung mit dem erkannten BLE-Gerät her.Behalten Sie aber auch zuerst einen starken Verweis auf die Peripherie:

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)
  }
}

Und der Rest sollte so sein:

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