5. Discovering services & characteristics

Discovering services

After connecting to peripheral, the most common task is to discover Services. Because all of wanted services are discovered at once, method returns Single<[Service]>. In order to make it into Observable<Service> and fire for each of service discovered, we advice you to use our RxSwift operator Observable.from()

Here's how it works in RxBluetoothKit:

peripheral.establishConnection()
    .flatMap { $0.discoverServices([serviceId]) }.asObservable()
    .flatMap { Observable.from($0) }
    .subscribe(onNext: { service in
        print("Discovered service: \(service)")
    })

Discovering characteristics

Discovering characteristics method is very similar to discoverServices. This time API's returning Observable<[Characteristic]> and to process one characteristic at a time, you need to once again use Observable.from()

peripheral.establishConnection()
    .flatMap { $0.discoverServices([serviceId]) }.asObservable()
    .flatMap { Observable.from($0) }
    .flatMap { $0.discoverCharacteristics([characteristicId])}.asObservable()
    .flatMap { Observable.from($0) }
    .subscribe(onNext: { characteristic in
        print("Discovered characteristic: \(characteristic)")
    })