CoreBluetooth app does not find all Bluetooth devices - iOS - ios

Question

Is there a way to discover all Bluetooth devices in an iOS app? I am using CoreBluetooth and I get all iDevices around plus one unknown device. However if I go to General -> Bluetooth -> Devices it lists a couple of devices that are not listed by the example app I am making. I need to find a none Apple device in the list and connect to it. Is this possible? And how come the two lists (the system one and the one in the app) are different?
In case it is important it needs to be used for ODB2 system later on, but for now just listing the none Apple device in the discovered devices will do.
Here is the code I am using to list the devices:
class HRMViewController: UIViewController {
var centralManager: CBCentralManager!
override func viewDidLoad() {
super.viewDidLoad()
centralManager = CBCentralManager(delegate: self, queue: nil)
}
}
extension HRMViewController: CBCentralManagerDelegate {
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {
case .unknown:
print("central.state is .unknown")
case .resetting:
print("central.state is .resetting")
case .unsupported:
print("central.state is .unsupported")
case .unauthorized:
print("central.state is .unauthorized")
case .poweredOff:
print("central.state is .poweredOff")
case .poweredOn:
print("central.state is .poweredOn")
centralManager.scanForPeripherals(withServices: nil)
}
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
print(advertisementData)
print(peripheral)
}
}