iOS Blinky is disconnected after DFU starts

[Amin]

I developed a software based on Blinky. I have been trying to add DFU to the current iOS app which is working properly to be like the Android app.

As I did in Android, the connection is established between phone and nRF52840 using BLS service. DFU will be manually triggered in case the firmware needs to be updated. I used the following code to start DFU :

let path = Bundle.main.path(forResource: "file1" , ofType: "zip")

            let url = NSURL.fileURL(withPath: path!)

            let selectedFirmware = DFUFirmware(urlToZipFile: url)

            let initiator = DFUServiceInitiator(queue: DispatchQueue(label: "Other"))

             initiator.forceDfu = true//false // default false

            initiator.logger = self as? LoggerDelegate  // - to get log info

            initiator.delegate = self // - to be informed about current state and errors

            initiator.progressDelegate = self // - to show progress bar


            if let peripheralDFU = self?.blinkyPeripheral.getPeripheral {

                initiator.with(firmware: selectedFirmware!).start(target: peripheralDFU)

                }

As soon as it runs, it disconnects from the blinky and it fails to initialise the DFUc process. Here is the terminal:

Connecting to Blinky device...

Connected to Blinky

Discovering LED Button service...

LED Button service found

Discovering LED and Button characteristrics...

Button characteristic found

LED characteristic found

Enabling notifications for characteristic...

Button notifications enabled

Writing LED value (with response)...

Data Rec: 0 46 29 0 0

Writing LED value (with response)...

Writing LED value (with response)...

Writing LED value (with response)...

Writing LED value (with response)...

Writing LED value (with response)...

Data Rec: 0 48 29 0 0

Data Rec: 0 49 29 0 0

Data Rec: 0 50 29 0 0

Data Rec: 0 51 29 0 0

Data Rec: 0 52 29 0 0

Data Rec: 0 53 29 0 0

Data Rec: 0 54 29 0 0

Data Rec: 0 55 29 0 0

Data Rec: 0 56 29 0 0

Data Rec: 0 57 29 0 0

Data Rec: 0 58 29 0 0

Connecting

Starting

Enabling DFU Mode

Blinky disconnected

Connecting

Starting

Enabling DFU Mode

Connecting

Starting

Enabling DFU Mode

[run_ar]

Hi,

Do I understand you correctly that DFU works with your android app, but not the iOS app? Did you try to follow the flow from our example application https://github.com/NordicSemiconductor/IOS-nRF-Toolbox? This is using our dfu library available her: https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library

[Amin]

Yes, my device has secure buttonless dfu service and can be programmed by nrfconnect app and my android app.

  I did follow the documentation to include required dependencies. As I see, starting the DFU makes the connection broken. The only thing I don't understand is adding a service changed characteristics for iOS. Is it still needed for SDK 16,?

[run_ar]

When adding dfu to your application did you also add this to the beginning of main as shown in ble_app_buttonless_dfu?

/ Initialize the async SVCI interface to bootloader before any interrupts are enabled.
    err_code = ble_dfu_buttonless_async_svci_init();
    APP_ERROR_CHECK(err_code);

[Amin]

Thanks, it solved the problem