Is it possible to do live DFU over the RADIO?

[Mitch996]

I'm wondering, is it possible? This is what I think it will be like if it were going to be implemented:

Acquire the firmware from a host somewhere.

Since the payload would have a max of 31 bytes, let's use only 16, for the sake of playing it safe.

Let's say the new firmware, the hex file, has a size of 60kb.

Which means that there will be 60,000/16= 3750 times of transfer minimum.

The new firmware will be downloaded to a clean section of the flash memory, and integrity checks will be performed.

Then the self-programming begins.

Clearly it has some major flaws, right away I can think of one: what if the firmware is much larger, for example, 90kb? If I had only a flash of 128kb, woudln't that make the whole thing impossible?

[Roger Clark]

As you mention 31 bytes... Do you mean that something will be constantly broadcasting the firmware image as part of its advertising packet?

Why not just accept connections and perform DFU in the normal way.

[Hung Bui]

@Mitch: As Roger already mentioned, have you tried the DFU bootloader example ? If yes, why you want to do it with advertising packet?

[Mitch996]

Hello, are you 2 suggesting a gatt connection between 2 devices to download firmware? My question still stands, what happens if the bond gets interrupted?

[Hung Bui]

It's hard to understand what you're asking about, Mitch. Please describe it more clearly. What is your set-up? How do you want to do DFU, when in connection or when advertising.