Major Description
We currently don't honor the flow values sent from a receiver to indicate how many messages our sender can produce (prefetch) and always maintain a fixed value based either on a transport configuration option or the first non-zero flow. This is however not in keeping with how the credit model is expected to work in AMQP and leads to some issues with the brokers sender accepting messages and buffering them until the receiver sends a flow thereby preventing those messages from being dispatched to another receiver subscribed to the same destination.
We need to honor the link credit and only dispatch when the receiver indicates it is willing to take messages by sending more link credit.