RTI Core Libraries and Utilities

What are preemptive ACKNACK and preemptive heartbeat messages?

The DDS reliability protocol uses Heartbeat messages and ACKNACK messages to ensure the receipt of data. A DataReader sends an ACKNACK message in response to a DataWriter’s Heartbeat; this ACKNACK message indicates which samples the reader received, and which samples it has yet to receive. For ...
grayson
Mon, 01/07/2019 - 15:22
7129 reads — 0 comments

Does Endpoint Discovery use unicast or multicast?

Endpoint Discovery uses either unicast or multicast, depending on the situation. First, some background: Endpoint Discovery is the process used by endpoints (that is, DataReaders and DataWriters ) to locate each other before they can begin to communicate user data. When a DomainParticipant is ...
samr
Tue, 12/18/2018 - 09:52
7345 reads — 0 comments

Why do I get the message “DDS COMMENDSrWriterService_onSubmessage:!ACK ignored: number of active RR is > 1, but sum of RR at is 0”

The following message is an internal debugging message that is printed at REMOTE verbosity level: COMMENDSrWriterService_onSubmessage:!ACK ignored: number of active RR is > 1, but sum of RR at is 0 Seeing this message is expected during normal operation and it does not indicate that something is ...
bobby
Mon, 11/19/2018 - 09:04
3812 reads — 0 comments

Enabling monitoring library in an application may result in a valgrind memory leak report.

When enabling RTI Monitoring library via the QoS file, a Connext DDS application might report a memory leak when using valgrind for memory usage analysis. An example of the valgrind output for this memory leak is found at the end of this article. Please see this Knowledge Base article for more ...
bobby
Tue, 08/28/2018 - 16:03
4009 reads — 0 comments

What happens if I rename the RTI Connext DDS installation directory?

Note : Applies to RTI Connext 5.2.x and above. When you run an RTI Connext DDS host installer, the installation directory will always be like this: <default install path or user defined installation path>/rti_connext_dds-x.x.x . The installer itself adds the “ rti_connext_dds-x.x.x ”. If you ...
sonia
Wed, 07/25/2018 - 03:16
2933 reads — 0 comments

QoS configurations for transport when starting applications with network interfaces disabled for IP mobility use case.

QoS configurations for transport when starting applications with network interfaces disabled for IP mobility use case With the introduction of version 5.3.0, Connext DDS supports Locator change at runtime. The IP mobility feature allows DDS applications to start without enabled network interfaces. ...
pranjali
Tue, 03/20/2018 - 12:46
7600 reads — 0 comments

Why two applications cannot communicate using shared memory when their network interface cards are different

RTI Connext DDS assigns a number, called a GUID, to each entity in order to uniquely identify it for the discovery process to work correctly. You can control how to set the GUID using the value assigned to rtps_auto_id_kind . For more information, see Controlling How the GUID is Set ( ...
acasado
Wed, 12/20/2017 - 07:43
4562 reads — 0 comments

Using default domain announcements to find participants on different domains

RTI Connext DDS uses a special discovery mechanism that allows RTI Tools such as Admin Console to find participants on different domains. The messages that make this possible are called default domain announcements. RTI Connext provides a couple of QoS settings that allow this special discovery ...
Marc.Chiesa
Tue, 12/19/2017 - 14:33
4856 reads — 0 comments

Deploying an RTI Connext DDS Application with Docker

This article assumes familiarity with Docker. For instance, you should know the difference between containers and images, and the purpose of a Dockerfile. If not, visit www.docker.com and get up to speed on Docker basics before reading further. Introduction In this example, we’ll build and deploy a ...
Mike Partington
Tue, 11/28/2017 - 12:12
11166 reads — 0 comments

Creating a Docker image with RTI Connext DDS

This article assumes familiarity with Docker. For instance, you should know the difference between containers and images, and the purpose of a Dockerfile. If not, then visit www.docker.com and get up to speed on Docker basics before reading further. Introduction In this example, we’ll create a ...
Mike Partington
Wed, 11/22/2017 - 11:47
12553 reads — 4 comments

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