For TTY/USB connect using Adafruit I use ckermit with ".kermitrc"
##vvv##
set line /dev/ttyUSB0
set flow-control none
set carrier-watch off
set speed 115200
connect
##^^^##
Then
>> sudo ckermit
works great!
Also, the KuGi case from Amazon works fine (my RasPi case did not leave room for the larger heat sink, but KuGi does).
Cheers,
-KenD
-KenD