The qpid-proton 'messenger' implementation currently uses hard-coded receiver-xxx and sender-xxx link names for all attachments.
I believe the AMQP 1.0 spec says here that:- although client-ids do not need to be unique, the triplet of <client-id>, <link-name> and <server-id> is guaranteed to be unique.
However, the qpid-proton Messenger code seems to have all link-name's hard-coded to sender-xxx and receiver-xxx
As an easyfix, I would suggest that by default the topicname part of the address should be appended to the link-name (instead of -xxx)
e.g., amqp://localhost/topicName --> sender-topicName / receiver-topicName
However, that would still cause a clash if the same messenger wanted to make two subscriptions to the same topic, so perhaps the Messenger implementation needs to track what link names it has allocated and ensure a unique name is assigned each time?