LLC_2_PDU_CMD_DISC
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1;
case LLC_2_PDU_CMD_DISC:
pdu->ctrl_1 |= LLC_2_PDU_CMD_DISC;