Discovery

Why DataWriter::write() execution time can grow with local multicast subscribers

Summary On Linux/Windows and potentially other operating systems, when a DataWriter sends data samples to a multicast address, the performance of the underlying UDP sendmsg() call varies depending on whether multicast DataReaders are located on the same local host. If there are no local, multicast ...
grayson
Fri, 08/01/2025 - 15:51
210 reads — 0 comments

Enabling communication between SPDP and SPDP2 participants with Routing Service

Communication between participants using Simple Participant Discovery Protocol (SPDP) and Simple Participant Discovery Protocol 2.0 (SPDP2) is not possible by default. Both participant and endpoint discovery will fail to complete between an SPDP and SPDP2 participant. See Discovery Overview in the ...
olivia.dorencz
Mon, 02/06/2023 - 14:35
36084 reads — 0 comments

Workaround for discovery failure between RTI Connext DDS Micro 2.4.11 and RTI Connext DDS 6.0.0

In RTI Connext DDS 6.0.0, the RTPS version has been changed to 2.3. This RTPS version is propagated during the discovery process and is verified by the receiving Connext DDS or Connext DDS Micro application to verify compatibility. In Connext DDS Micro 2.4.11 and earlier, this check is hard-coded ...
bobby
Wed, 04/10/2019 - 10:32
53556 reads — 0 comments

Communicating DDS Entities with different type bounds

By default, a DataWriter of an unbounded type won’t be able to communicate with a DataReader of a bounded type. DDS includes the max size of a bounded type as part of the data type information (known as TypeCode or TypeObject). Since the data type information is used during the Discovery phase, if ...
Valentin Perez
Fri, 11/25/2016 - 01:08
4385 reads — 0 comments

Why can't more than 5 DomainParticipants communicate within in the same machine?

If you have more than 5 DomainParticipants in the same machine, you may notice that your applications are not able to communicate with Participant number 6 and following ones. This is because by default we discover up to 5 DomainParticipants in one location. This behavior is controlled by the Peer ...
sonia
Fri, 10/14/2016 - 04:01
7582 reads — 0 comments

Why is the discovery phase taking so long on my Windows system?

Description The discovery phase in DDS applications can be considered a high throughput scenario under some circumstances. Some examples are: The applications have a lot of DDS entities. More than 2 hosts are involved. The type definitions are sent within the discovery packets (i.e., TypeCode and ...
Juanjo Martin
Thu, 05/28/2015 - 06:57
10889 reads — 1 comment

How can I reduce the discovery time?

For complex systems with hundreds of participants and endpoints, discovery may cause long startup times and high network utilization. There are several options that help increase discovery performance: 1) Reduce the size of discovery packets 1.1. You can configure the middleware to not send the ...
Juanjo Martin
Thu, 08/07/2014 - 03:00
59866 reads — 0 comments

I Put My Machines In My Initial Peers Lists -- Why Don’t They Discover Each Other?

There are some situations in which two applications, even though they have been configured to have each other in their initial peers lists, will not discover each other. Two applications are on the same machine and have only either 127.0.0.1 or "localhost" in their initial peers lists AND ...
erin
Mon, 07/07/2014 - 14:26
10203 reads — 0 comments

Why do I see error messages about unreachable destinations?

Note: Applies to RTI Data Distribution Service 4.1. If you start an application with shared memory as the only transport and then start a second application with a multicast address in NDDS_DISCOVERY_PEERS or in the multicast_receive_addresses field in the Discovery QosPolicy on the same node, you ...
dstockdill
Thu, 01/17/2013 - 12:42
4359 reads — 0 comments

What is the max. number of octets I can put into the topic_data for builtin topics?

As described in the online HTML documentation for the DomainParticipantResourceLimits Qos Policy, there is a QoS parameter called topic_data_max_length , which is used to set the maximum length of the topic data to be sent out. topic_data_max_length is a DDS_Long, which is a 32-bit signed long ...
dstockdill
Thu, 01/17/2013 - 12:37
8716 reads — 0 comments

Pages

Subscribe to RSS - Discovery