USB Radio Modem

I am using the latest git fetch as of today, and am trying to get telemetry over usb radio modem. Using sudo ./ArduPlane.elf -A udp: -C /dev/bus/usb/001/012 I can still get udp telem, but no data is ever sent over radio modem. It is a 3DR v2 (black case) connected via direct usb, and it’s mount point is Bus 001 Device 012: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO).

Hello John,
you should specify the virtual serial port attached to the usb device, not the usb device itself. Usually it’s /dev/ttyUSB0.

I am having the same problem when I try to use /dev/ttyUSB0

sudo ./ArduCopter.elf -A udp: -C /dev/ttyUSB0

It started for couple seconds but after that it shows:
AK8963: bad DEVICE ID

Please cycle power and try again.