Example of detecting USB device with VID and PID - objective-c

Question

I have a usb device that will not use SERIAL or HID device communication. It is in DFU mode. How do i can detect it for beginning ? I read a lot of articles and look on examples but they not helped for me.
As i understand i should use IOKit.usb library for this? It will be great if someone will show me how do i can detect this device:(

Answer 1

Thanks for answers, i build my own solution:
class DFUDevice: NSObject {
let vendorId = 0x0483
let productId = 0xdf11
static let sharedInstance = DFUDevice()
private func reloadMonitor(iterator:io_iterator_t) {
repeat {
let nextService = IOIteratorNext(iterator)
guard nextService != 0 else { break }
IOObjectRelease(nextService)
} while (true)
}
func connected(iterator:io_iterator_t) {
self.reloadMonitor(iterator: iterator)
}
func disconnected(iterator:io_iterator_t) {
self.reloadMonitor(iterator: iterator)
}
func initUsb() {
var matchedIterator:io_iterator_t = 0
var removalIterator:io_iterator_t = 0
let notifyPort:IONotificationPortRef = IONotificationPortCreate(kIOMasterPortDefault)
IONotificationPortSetDispatchQueue(notifyPort, DispatchQueue(label: "IODetector"))
let matchingDict = IOServiceMatching(kIOUSBDeviceClassName)
as NSMutableDictionary
matchingDict[kUSBVendorID] = NSNumber(value: self.vendorId)
matchingDict[kUSBProductID] = NSNumber(value: self.productId)
let matchingCallback:IOServiceMatchingCallback = { (userData, iterator) in
let this = Unmanaged<DFUDevice>
.fromOpaque(userData!).takeUnretainedValue()
this.connected(iterator: iterator)
}
let removalCallback: IOServiceMatchingCallback = {
(userData, iterator) in
let this = Unmanaged<DFUDevice>
.fromOpaque(userData!).takeUnretainedValue()
this.disconnected(iterator: iterator)
};
let selfPtr = Unmanaged.passUnretained(self).toOpaque()
IOServiceAddMatchingNotification(notifyPort, kIOFirstMatchNotification, matchingDict, matchingCallback, selfPtr, &matchedIterator)
IOServiceAddMatchingNotification(notifyPort, kIOTerminatedNotification, matchingDict, removalCallback, selfPtr, &removalIterator)
if matchedIterator != 0 {
self.connected(iterator: matchedIterator)
matchedIterator = 0
}
if removalIterator != 0 {
self.reloadMonitor(iterator: removalIterator)
removalIterator = 0
}
self.reloadMonitor(iterator: matchedIterator)
self.reloadMonitor(iterator: removalIterator)
RunLoop.current.run();
}
}
To run it:
let DFUDeviceDaemon = Thread(target: DFUDevice.sharedInstance, selector:#selector(DFUDevice.initUsb), object: nil)
DFUDeviceDaemon.start()