DFU using BLE stops working when migrating from SDK version 2.9.1 to 3.2.4

[AndersLundqvist]

Hi,

We have an application where we have a working DFU over BLE with SDK 2.9.1 but once we have migrated to 3.2.4 it has stopped working. Something has obviously changed between those versions, but what do we need to change in order for it to work?

Best regards

[Susheel Nuguru]

A lot of things have changed after NCS 2.9.1

1. SMP GATT now requires authentication by default, you add CONFIG_MCUMGR_TRANSPORT_BT_PERM_RW=y in your prj,conf Without this SMP might silently reject writes unless client authenticates first.
2. If your DFU mechanism was using legacy pairing, then add CONFIG_BT_SMP_SC_PAIR_ONLY=n

[AndersLundqvist]

Interesting, but there must be something more to it than that because it doesn't solve the issue. The device is not responding...

[AndersLundqvist]

Not really sure what is actually going on....

We are using the https://boogie.github.io/mcumgr-web/ site for DFU and it works for 2.9.1 but with 3.2.4 code it doesn't (the device does not respond). This is true for both Chrome and Edge.

However when using my iPhone with "nRF Connect Device Manager" it works perfectly...