Add the ability to specify an arbitrary "reply-to" address for command replies

Currently the reply-to address for sent commands is in the following format:

control/TENANT/4711/${replyId}

The ${replyId} is created by the Hono-Client (or AMQP-client).

For Eclipse Ditto it would be really helpful if when sending a command the whole “reply-to” address could be specified, or at least the part after control/TENANT.

That way we could pass in for each command a common “catch all” address like for example:

control/TENANT/replies

Ditto would only have to attach to this address in order to get all command replies.

Background: Ditto’s connectivity is clustered among several cluster nodes. When a failover happens (e.g. because one node crashes, a Hono connection which was established on this node will be opened on a still “living” cluster node. The new node however can have no knowledge of the ${replyId}s which were created on the other cluster node which crashed.

Would that be possible? Feels like if the client already specifies the ${replyId} it could also specify the whole address.

[sophokles73]

fixed in https://github.com/eclipse/hono/commit/b29f887b7e548725a8b6a6bead93ae2d162dc21d

[pellmann]

This would be a change in our API for the reply-to and the sender link address used by the adapter. But I think it makes sense to change it this way, as long as we stay with control/tenant/ for authorization.

Before

control/${tenant_id}/${device_id}/${reply-to}

After

control/${tenant_id}/${reply-to}

and our Hono client by default will set ${reply-to} as ${device-id}/something