According to SPEC.
The client shall send a Handle Value Confirmation in response to a Handle
Value Indication. No further indications to this client shall occur until the confir-
mation has been received by the server.
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The master/server has to wait for confirmation (via this handle) after every msg is sent. In real applications, there are situations whereby a user can press a button twice in between a very short interval, the master will send and wait for confirmation, and repeat again.