MathWorks

I have two applications, CircleRx and CircleTx running on two different computers.  CircleRx reads topic Circle, while CircleTx sends one sample of Circle.  CircleRx starts first.  Minutes later CircleTx starts and  immediately sends a single Circle sample.  The sample is sometimes missed by CircleRx.  I suspect this is due to a race condition between discovery and the transmit of the sample.  I assume the Reliabilty QoS can be used to ensure Rx of this sample.  What are the proper Reliability settings  for the reader and writer to ensure deliver

Hello,

Hello,

Is there an API that can be used to determine if a type has been previously registered via DDS_DomainParticipantFactory_register_type_support()?

Thanks.

Mark.

I am using the Dyanamic Data API's to send/receive toipcs with unions.  I have 3 questions about the proper way to handle the discriminator value when read/take a sample that contains a union. The descriminator value is needed in order for the data reader application code to know which field in the union data structure has valid data.

Hello,

Hello,

Is there an API what will give me the IDL-equivalent for a DDS_TypeCode that has been previously registered?  Since the Admin Console can display IDL information, I assume this is possible but haven't been able to find appropriate function.

Thanks.

Mark.

There are existing API's for accessing QoS libraries and profiles ( DDS_DomainParticipantFactory_get_qos_profile_libraries(), DDS_DomainParticipantFactory_get_qos_profile()).

Are there similar functions for loading <types>, <domain_library> and  <domain_participant_library>?  I searched through doc and header files but can't find anything.

Thanks.

I have an application that uses read_next_sample()/take_next_sample().   What is the proper way for the application to determine if a valid sample has been read/taken.  Does return value of DDS_RETURN_OK indicate a valid sample?  Or must SampleInfo.valid_data also be checked before using the sample data?

Hello

Is there a DataReader StatusCondition, ReadCondition or QoS policy that will allow DataReader to only return a sample when the contents of the sample have changed?

Thanks.