The code to turn on and off backlit LEDs was added. The LEDs should be connected to pin 13 and they turn on when a connection has been made. This has not been tested yet but should work.
I had to refuse this PR. some reasons,
first: a connection LED inside a closed box make no sense,
second: the connection is therefore indicated by the LCD display
third: you can use the Pin for another button
The code to turn on and off backlit LEDs was added. The LEDs should be connected to pin 13 and they turn on when a connection has been made. This has not been tested yet but should work.