[iOS DFU Library] Not using the device name as "DfuTarg" ?

[MANGO]

• SoftDevice : S110 7.1

• SDK 7.2

• Example : experimental_ble_app_uart + DFU service

• Using IAR 7.1

• Board : PCA10001 V 2.0.0 (Rev. 2 MCU)

• Test device : Nexus 5 (Android 5.1.1) and iPhone 6+ (iOS 8.4)

• Toolbox App Version : 1.14.1 (at Nexus 5) & 2.1 (at iPhone 6+)

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Hi, since I don't know Swift, I don't know how the Toolbox app works.

So, if there are some points which I'm missing, please understand my situation.

(iOS Toolbox (GitHub))

// at dfu_transport_ble.c
#define DEVICE_NAME                          "DfuTarg" /* I want to change this name for my own purpose */
#define MANUFACTURER_NAME                    "NordicSemiconductor"

As you know, after updating the firmware by using the DFU,

my iOS devices remembers my device as DfuTarg due to memory caching.

After the update, when I connect the board with the UART app,

the connection message says that, it is connected with DfuTarg and I do not want this to happen.

So, when using the bootloader, I changed the name DfuTarg to Nordic_UART.

I just wanted to maintain the name to see the same message after the firmware update.

However, when I change the device name (in the bootloader code), the Toolbox app

keeps connecting and disconnecting with the board.

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So, my question is

the library of the DFU only reconnects when the device name is DfuTarg?

In other words, when the bootloader is running, the device name has to be DfuTarg

in order to run the DFU?

If so, after the firmware update is done, I want to cache my device name as the

new name (which is described in the new firmware image, like Nordic_UART),

instead of leaving the name as DfuTarg.

What implementations are needed?

-Regards

[Hung Bui]

Hi Mango,

The DFU master won't base on the name of the advertising name to find the bootloader but on the Address and the 128 bit service UUID in the advertising packet.

So it shouldn't be a problem to change the name of the bootloader.

However, since the 128 bit service UUID is included in the advertising packet, the length of the bootloader should be short. It should not be more than 8 digit otherwise you will have an error when start advertising.

[Alex]

Android Toolbox clears cache if you close and open it again.

[MANGO]

Didn't know that. Thanks for telling me.

Have you tried Swift? I'm curious whether a method to clear cache in iOS exists or not?

Do you know methods that will do things like this?

[MANGO]

Oh, you pointed my problem correctly.

I defined the device name 9 digits. I totally forgot to calculate the length.

Then if I still want to use this 9 digit name,

adding ble_advdata_t scanrsp may do the trick, does it?

[Alex]

I don't use iOS much and don't know what Swift is but I heard that switching off and then back on Bluetooth on iOS helps with cache. If you paired device you need to "forget" it.