NBR_EVT_REQUEST_RCVD
{NBR_STA_DOWN, NBR_EVT_REQUEST_RCVD, NBR_ACT_NOTHING, NBR_STA_REQ_RCVD},
{NBR_STA_ACTIVE, NBR_EVT_REQUEST_RCVD, NBR_ACT_NOTHING, NBR_STA_ACTIVE},
nbr_fsm(nbr, NBR_EVT_REQUEST_RCVD);