NDDS

You can find the definition of “LOST_BY_WRITER” here in the API: “ A DDSDataWriter removed the sample before being received by the DDSDataReader. This constant is an extension to the DDS standard. ” If you are using KEEP_LAST as the History kind , the reason for this data loss might be the ...
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The default value for publish_with_original_info is false. When this property is set to false RTI Routing service will change the metadata fields Writer GUID and Sequence Number in every sample. As a consequence, the applications can not know the original source of the sample, that is the ID of the ...
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The TRANSPORT_PRIORITY DataWriter Qos Policy controls the transport-level priority settings. Each transport maps it to a transport-specific prioritization mechanism which in the case of UDP are the IP packet diffserv ToS/DSCP bits . Out-of-the box this feature is not enabled, but this forum thread ...
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By default, RTI Connext DDS sends data with very low latency. However, the latency of your data depends on several factors, including: The latency of your network hardware The congestion on your network The priority of the threads that receive your data You may not be able to control your network, ...
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Note: Applies to NDDS 3.0 and VxWorks 5.4. Introduction The VxWorks TCP/IP stack uses a fixed amount of buffers. The buffers and their sizes are configured in the kernel. This is different from non real-time OSs, where the buffers can be taken as needed from main memory. In many NDDS applications ...
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Note: Applies to NDDS 3.x and RTI Connext 4.x and above First, it is important to point out that NDDS 3.x and RTI Connext 4.x and above are not wire-protocol compatible. Applications built with these 2 products cannot communicate with each other. Second, although the object models of both products ...
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One of the more common reasons is due to the parameter late_joiner_heartbeat_period (part of DDS_RtpsReliableWriterProtocol_t , used in the DataWriterProtocolQosPolicy and DisoveryConfigQosPolicy ) which is new in RTI Data Distribution Service 4.2. late_joiner_heartbeat_period is used when a ...
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One potential cause of poor performance on a Linux system is the amount of buffer space the RHEL 4u4 kernel uses to reassemble IP fragments. The parameters in /proc/sys/net/ipv4 control various aspects of the network, including a parameter that controlls the reassembly buffer size. ...
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Note: Applies to NDDS 3.x and earlier, RTI Data Distribution Service 4.0 and 4.1 To monitor the state of the data buffer usage inside the stack, you can use the netStackDataPoolShow or mbufShow functions. Both commands give the same information. If the stack has been running out of clusters, these ...
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Note: Applies to NDDS 3.x. NDDS's internal time representation is in NTP format rather than DDS_Time for computational efficiency reasons. The header osapi/osapi_ntptime.h defines NTP time class ( struct RTINtpTime ) as well as its manipulation methods. A brief excerpt from this header file is ...
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