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disable_encryption to true and uart_device_file to point to where your brd2703a landed in /dev (the default is probably correct). No other changes to cpcd.confCONFIG_USB_ACM=y
drivers/usb/class/Makefile
CONFIG_TUN=y
drivers/net/tap.c
CONFIG_IEEE802154=y
net/ieee802154
CONFIG_MAC802154=y
net/mac802154