Draft 04 currently doesn't mention about sending any response when the SUBSCRIBE_UPDATE is successful or when it fails even though the draft hints on possible failures
If Objects before the start or after the end of the current
subscription are needed, a separate subscription can be made. The
start Object MUST NOT decrease and when it increases, there is no
guarantee that a publisher will not have already sent Objects before
the new start Object. The end Object MUST NOT increase and when it
decreases, there is no guarantee that a publisher will not have
already sent Objects after the new end Object.
The above suggests that an error should be sent to inform the client that it is making invalid subscription updates.
ianswett
commented
1 week ago
Draft 04 currently doesn't mention about sending any response when the SUBSCRIBE_UPDATE is successful or when it fails even though the draft hints on possible failures
The above suggests that an error should be sent to inform the client that it is making invalid subscription updates.