@timj First check you are running the latest firmware version. Use the oupgrade command to check or you can flash the latest images in the repo: http://repo.onioniot.com/omega2/images/ I wonder if there is a handshaking issue, do you know if the device uses hardware/software handshaking? You can use the stty package to configure the tty. (opkg install coreutils-stty) then use the stty -a command to view the command syntax.