Please close the psubTopic

[wenyue]

Please close the psubTopic when the context is done.

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[hsanjuan]

Can you be more specific/provide more details?

[wenyue]

In the NewPubSubBroadcaster function，we join and create a psubTopic object, and this object should be closed when the context is done.

[wenyue]

Any update?

[hsanjuan]

Mind sending a PR?