Topic Name

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Topic Name, while it is true that the Data Distribution Service (DDS) API specification does not mention a limit for Topic names, the complementary DDS Wire Protocol specification: Real-time Publish-Subscribe (RTPS) protocol (http://www.omg.org/spec/DDSI-RTPS/2.2) does state that Topic names shall not exceed 256 characters (see Table 9.12).

Source: Topic Name