UMP_MSG_TYPE_SYSTEM
case UMP_MSG_TYPE_SYSTEM:
data->system.type = UMP_MSG_TYPE_SYSTEM; // override
data->system.type = UMP_MSG_TYPE_SYSTEM; // override
data->system.type = UMP_MSG_TYPE_SYSTEM; // override
case UMP_MSG_TYPE_SYSTEM:
data[0] = ump_compose(UMP_MSG_TYPE_SYSTEM, group, 0, cvt->buf[0]);
data[0] = ump_compose(UMP_MSG_TYPE_SYSTEM, group, 0, c);