SUME_RIFFA_CHAN_STATE_READY
send->state = SUME_RIFFA_CHAN_STATE_READY;
case SUME_RIFFA_CHAN_STATE_READY:
recv->state = SUME_RIFFA_CHAN_STATE_READY;
case SUME_RIFFA_CHAN_STATE_READY:
send->state = SUME_RIFFA_CHAN_STATE_READY;