SR_AACK_I_AM_COORD
at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);