? Note added 12/4/2018: Some individuals have reported that there is a problem
with the November, 2018 revision of Raspbian that results in the serial port not
being accessible. You would notice this, for example, if you run pitnc_getparams
and you keep getting ¡°retrying¡¡± instead of the menu. In this case you need to edit
the config.txt file in the /boot/ directory. You can do this by running the following
from the command line:
sudo leafpad /boot/config.txt
Add the following line at the bottom of this file:
dtoverlay=pi3-miniuart-bt
This problem seems to be fixed with more recent versions of the Stretch version of
Raspian.? ?