RTI Core Libraries and Utilities

Checking TCP Connections

The following three configurations are related to detecting issues on the TCP connections. Although they seem similar, they enable different features with subtle differences. Connection Liveliness When the Connection Liveliness feature is enabled, RTI TCP Transport Liveliness Request and Response ...
isabel
Mon, 03/11/2019 - 09:24
2240 reads — 0 comments

Under which circumstances will Connext DDS send non-user data?

When we call DataWriter::write() , we expect to see a user data packet sent on the wire, but under what conditions will Connext DDS send packets of its own accord? There are many reasons why Connext DDS may send messages other than user data. Some of the more common reasons are described below. ...
samr
Mon, 03/04/2019 - 05:48
3330 reads — 0 comments

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
2671 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
18492 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
4690 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
5254 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
3218 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
3233 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
2444 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
6207 reads — 0 comments

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