This is a good thread to start with: Re: How to find RSSI from WICED SMART?
In addition, we provide the proximity_client and proximity applications within the SDK within the \apps directory.
There is also a Broadcom 'Find Me' application on Google Play.
Regarding changing power settings, this is probably the best thread: Re: How to find RSSI from WICED SMART? , but there are several others as well.