samples: bluetooth: display source address in beacon console output

Users testing beacon capability will likely want to see the beacons in
a sniffer tool.  Switch to an advertising mode that uses a persistent
known address, and display that address on the console output.

This also demonstrates techniques to retrieve the advertising address
where one is known.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
2 files changed