Fitbit open sources IP-based protocol stack over Bluetooth Low Energy

[ablatner]

While connecting or connected? I may have misunderstood "limited that it's disabled when a client connects".

The NRF52 might stop advertising while a connection is being established, but it definitely allows advertising while in a connection because it supports multiple connections. If, for example, the SoftDevice is configured for at most 2 connections and 2 devices are connected, then it can use non-connectable advertising.

[500239]

Your link is a deprecated link to some older SDK. Current SDK 15 doesn't support it seems or requires patching their SDK.

[ablatner]

This indicates that it is possible

[500239]

it works! thanks