Implement manual ack/nack
Description of changes on: https://codimd.web.cern.ch/s/r1BFhCWUP#Conclusions
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Set the connections attribute inside the listener in order to be able to ack/nack: -
Create ack_msg/nack_msg methods on the listener -
Wrap the processing of the message with a try/catch and ack/nack accordingly.