PSM_STAT_RDA
if ((rc = psm_wait(sc, PSM_STAT_RDA)) != 0) {
if ((rc = psm_wait(sc, PSM_STAT_RDA)) == 0) {
if ((rc = psm_wait(sc, PSM_STAT_RDA)) != 0) {
if ((rc = psm_wait(sc, PSM_STAT_RDA)) == 0) {