I am connected to an embedded Linux device using GNU screen. The connection is via /dev/rfcomm0 which is a Bluetooth serial interface. I frequently forget to put an & after a CLI command, which blocks the interface until the command completes. I would like to be able to send a ctrl-C break to the CLI, but when I do the terminal just echoes ^C. I've tried changing the flow, XON/XOFF, escape sequences, :stuff $'**' with various *'s.
As far as I understand, there is no way for me to make a second screen interface into the serial device in order to send a kill.
Is there a way for me to send a ctrl-C break to the CLI over screen?