IMSG_CTL_DISCOVER_EVPID
case IMSG_CTL_DISCOVER_EVPID:
case IMSG_CTL_DISCOVER_EVPID:
case IMSG_CTL_DISCOVER_EVPID:
srv_send(IMSG_CTL_DISCOVER_EVPID, &evpid, sizeof evpid);
srv_recv(IMSG_CTL_DISCOVER_EVPID);
CASE(IMSG_CTL_DISCOVER_EVPID);