Hi I am looking for an advise about selection of the optimal connection parameters. I am using couple of nrf52832 devices as the nus peripherial. As the central device I use esp32 that acts as gateway. It collects data from NRF peripherial devices. I don't know how to select connection parameters fo...

Hi,
You can use:

gattc_if

variable that it is passed to this function as the argument instead hardcoded indexes.