rumqttc - ack with reason code

[ting-ms]

Does rumqttc support replay ack with a reason code?

[swanandx]

Hey, rumqttc doesn't support it right now, but would be nice to have!

also there is #609 , I'm thinking we can modify ack fn to take Ack as suggested in issue description, wdyt?

Thank you so much!

[ting-ms]

If we are going to add a new API such as get_ack_packet(&Publish) -> Ack, we could consider adding additional parameters, such as PubAckReason and PubAckProperties, and then modify the ack function to accept Ack as its argument.

[xiaocq2001]

Proposed some solution with ack packet, please check: #855