SFAS_NF_SDTR_SENT
nexus->flags |= SFAS_NF_SDTR_SENT;
if (nexus->flags & SFAS_NF_SDTR_SENT) {
nexus->flags &= ~SFAS_NF_SDTR_SENT;
if (!(nexus->flags& SFAS_NF_SDTR_SENT))
nexus->flags &= ~SFAS_NF_SDTR_SENT;