Publications

An application uses DataWriters to send data. A DataWriter is associated with a single Topic. You can have multiple DataWriters and Topics in a single application. In addition, you can have more than one DataWriter for a particular Topic in a single application. Publishers own and manage DataWriters.

To create a DataWriter, you need a Topic (see Topics) and a DomainParticipant. Additionally, you may add a QoS parameter and a listener.

The following code creates a DynamicData.DataWriter for the Topic we created in the Topics section:

publisher = dds.Publisher(participant)
writer = dds.DynamicData.DataWriter(publisher, topic)

To publish data, create a sample, update its values, and write it:

data = dds.DynamicData(my_type)
data["foo"] = "test"
writer.write(data)