If your using AirconsoleOSX to create a virtual tty line (/dev/tty.Airconsole-1), and then connecting to it with screen, beware that a previous session of screen may have the device locked.
When this happens you may see a message like:
To fix this run the following command in the terminal to find the screen process that current has a lock on the Airconsole-1 tty line. This command may take a while to run.
Simons-MacBook-Pro-2018:~ simonhope$ lsof | grep Airconsole-1
screen 30999 simonhope 5u CHR 21,32 0t17 1073 /dev/tty.Airconsole-1
In this case the process 30999 has an active lock - so to reconnect with the screen program to the Airconsole LE tty line (with AirconsoleOSX running and connected), run following command:
screen -x 30999
(replacing the 30999 with whatever process number on your system has the Airconsole-1 locked)
To connect a different terminal program to the Airconsole LE, kill the screen process completely to stop it locking the Airconsole-1 tty line for other Apps.