'bulk': Message must be sent together with other messages in the correct sequence.
No immediate delivery required.
'queue': Request shall be sent 'as-is' as soon as possible.
Multiple identical requests shall be delivered multiple times.
Not strict ordering required.
'immediate': Request shall be sent immediately and not be kept for later retries (e.g. response message).
'keep-payload': Request shall be sent as soon as possible.
If immediate delivery fails, the exact same payload is only sent once, even if there were
multiple requests.
'keep-command': Request shall be sent as soon as possible.
If immediate delivery fails, only the latest command for each command ID is kept for delivery.
'keep-cmd-undiv': Request shall be sent as soon as possible.
If immediate delivery fails, only the latest undivided set of commands is sent for each unique
set of command IDs.
Send request policies: