I’ve been using QtSoundModem for several months now. one thing that bothering in mind was i’ve always have my serial port changed. ie: sometimes it’s ttyUSB0 sometimes it changes to ttyUSB1.i could just change from QtSoundModem gui to the right port. but it’s not practical. i found solution abd been using it for month to make my usb serial port persistent. kere’s the step:
lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 013: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
Bus 001 Device 012: ID 1b3f:2008 Generalplus Technology Inc.
Bus 001 Device 011: ID 14cd:8601 Super Top 4-Port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
sudo vi /etc/udev/rules.d/99-usb-serial.rules
SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="PTT"
it will make serial tty with vendor id 1a86 and product id 7523(it’s QinHeng Electronics HL-340 USB-Serial adapter) symlinked to port named PTT.
now, even it changed to whatever ttyUSB0 or whatever number it always had the same symlink, PTT.
