RE: How to block the over-the-air DFU?

vonRollChristophe — Tue, 20 May 2025 06:22:51 GMT

Hi,

You're right, it is your old nRF52SDK.

Mutual authentication is a part of the procedure to recognize two communicating devices for cybersecurity.

Thanks for your answer. I will try your solution.

Best regards

RE: How to block the over-the-air DFU?

Susheel Nuguru — Wed, 14 May 2025 10:53:40 GMT

Hi, I am assuming that this is our older nRF5SDK related development.

I am not so sure what you mean by mutual authentication (probably a translate error?), but if you mean that you need pairing or bonding established before these two devices can start the OTA process, then there is no native support for it.

As far as I know, once you have called ble_dfu_buttonless_init and returned will have registered the DFU service already. You would have to split this init into two parts if you want to have authentication/trigger check in between. I do not have an example to show you, but this is doable with some changes to the way you initialize the dfu and probably handling BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST a bit different and then re advertising the dfu service after you receive this Authorize request.