msg->len = 0; // length of data in the payload
msg->alloc_len = mlen; // length of allocated payload
msg->payload = msg->header + sizeof( uta_mhdr_t ); // point past header to payload (single buffer allocation above)
msg->len = 0; // length of data in the payload
msg->alloc_len = mlen; // length of allocated payload
msg->payload = msg->header + sizeof( uta_mhdr_t ); // point past header to payload (single buffer allocation above)