QoS

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QoS

Can someone kindly let me know who defines the QoS policies in DDS and how are new policies announced/accepted?

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Hello, 

QoS can be defined by all the entities in your DDS application. There are QoS for particpants, subscribers, publisher, topics, datareader, datawrtiers and so on. 

Some QoS have a local effect, for example they are used to configure how much memory a specific entitit should reserve.
Some QoS are propagated on the wire and used to match local and remote entities using a RxO (Request Offer) mechanism.

I hope this brief introductions helps but, to have a better idea, you should have a look to this chapter in the user manual.

Best,
  Gianpiero