Expedite BLE connection parameter adaption instant

[nathanprins]

Hi! Thanks for taking the time to read this!

I am trying to reduce the time between a BLE connection parameter update request and the instant that the new parameters are adopted. I've gone through the BLE stack to manually reduce instants but nothing seems to change it (it's always 13 connection events from the point the request is accepted).

This seems to be a combination of Slave Latency + something else + 6U (hardcoded value) = 13.

Question: Can anybody point me in the right direction w.r.t. changing the calculation for which instant the conn params are adopted?

Among others, I have played with the values in ull_llcp_conn_upd.c but nothing seems to change.

As to why: this is just an exercise in finding the limits of the bluetooth spec.