When a subagent is finished and wants to end processing, it should first UNREGISTER its sub-trees and then close the "connection" with the agent. To do so, it must send a DPI CLOSE packet, which specifies a reason for the closing. See DPI CLOSE Reason Codes for a list of valid codes. You should not expect a response to the CLOSE request.
A subagent should also be prepared to handle an incoming DPI CLOSE packet from the agent. In this case, the packet will contain a reason code for the CLOSE request. A subagent does not have to send a response to a CLOSE request. The agent just assumes that the subagent will handle it appropriately. The close takes place regardless of what the subagent does with it.
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