Solutions

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
4945 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
3795 reads — 0 comments

How to use DDS Secure logging

When using RTI Security Plugins, secure logging stores information about security events. This information can be provided via the standard output or log file, or distributed over DDS. The information is different between the two methods. Standard output or output file When Secure logging is ...
migueltorres
Wed, 02/13/2019 - 10:02
6266 reads — 0 comments

Why an unbounded sequence defined in XML results in a sequence with a default size

If a type defined in XML has its sequences or strings set to -1 in the attributes sequenceMaxLength or stringMaxLength, the resulting sequence or string length is interpreted as being of a default size, i.e., 100, rather than unbounded. This issue occurs when working with XML-Based Application Creation in particular, and Dynamic Data-based applications in general. ...
Sandra Rodriguez
Wed, 01/30/2019 - 16:25
3070 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
46757 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
7039 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
7281 reads — 0 comments

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