RTI Core Libraries and Utilities

Updated 5.3.x Security Files

The identity certificates that were shipped with Connext 5.3.1 expired on February 16th, 2019. Therefore, creating a DomainParticipant that tries to use those certificates will fail and will report different problems. This solution documents the most common error messages and provides a set of new certificates, private keys, signed governance, and signed permissions documents valid through February 2029. ...
yusheng
Wed, 02/13/2019 - 13:53
4581 reads — 0 comments

FlatData and ZeroCopy examples

Connext 6 introduces two features: Zero Copy Transfer over Shared Memory and FlatData Language Binding . These features enable the middleware to reduce the number of copies involved in sending a sample, resulting in lower latencies for large data. The following examples show how to use these ...
alexc
Mon, 01/21/2019 - 09:25
60862 reads — 0 comments

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
8499 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
8670 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
4138 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
4562 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
3330 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
8817 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
5106 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
5810 reads — 0 comments

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