A development partner for teams solving real-world problems with Mobile, Web & Wearable products.

import UIKit
import CoreBluetooth

class FitnessTrackerManager: NSObject, CBCentralManagerDelegate {
    var centralManager: CBCentralManager!
    var tracker: CBPeripheral?
    
    let heartRateService = CBUUID(string: "180D")
    
    override init() {
        super.init()
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }
    
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        if central.state == .poweredOn {
            centralManager.scanForPeripherals(
                withServices: [heartRateService]
            )
        }
    }
    
    func centralManager(_ central: CBCentralManager,
                       didDiscover peripheral: CBPeripheral,
                       advertisementData: [String : Any],
                       rssi RSSI: NSNumber) {
        tracker = peripheral
        centralManager.connect(peripheral, options: nil)
    }
}

import android.bluetooth.BluetoothAdapter
import android.bluetooth.le.ScanCallback
import android.bluetooth.le.ScanResult
import kotlinx.coroutines.flow.MutableStateFlow

class FitnessTrackerManager(private val context: Context) {
    
    private val adapter = BluetoothAdapter.getDefaultAdapter()
    val heartRate = MutableStateFlow<Int>(0)
    
    fun startScan() {
        adapter?.bluetoothLeScanner?.startScan(object : ScanCallback() {
            override fun onScanResult(callbackType: Int, result: ScanResult) {
                if (result.device.name?.contains("Fitness") == true) {
                    connectToDevice(result.device)
                }
            }
        })
    }
    
    private fun connectToDevice(device: BluetoothDevice) {
        device.connectGatt(context, false, object : BluetoothGattCallback() {
            override fun onConnectionStateChange(gatt: BluetoothGatt, 
                                                 status: Int, 
                                                 newState: Int) {
                if (newState == BluetoothProfile.STATE_CONNECTED) {
                    gatt.discoverServices()
                }
            }
        })
    }
}