hdlc_tx_frames
ret = hdlc_tx_frames(bg, bg->rx_buffer[0], (bg->rx_buffer[1] >> 1) & 0x7, NULL, 0);
ret = hdlc_tx_frames(bg, ADDRESS_GREYBUS, 0x03, payloads, 3);
return hdlc_tx_frames(bg, ADDRESS_CONTROL, 0x03, &payload, 1);
return hdlc_tx_frames(bg, ADDRESS_CONTROL, 0x03, &payload, 1);