3.2.2 Timers
The server peer MUST set a backoff timer [WS-Discovery] randomly between 1 millisecond and a maximum value (defined by the WSD Protocol constant APP_MAX_DELAY). If the server peer has the requested segment IDs in the request, the server MUST send the ProbeMatch message back to the requesting peer when the backoff timer expires. If the server peer does not have the requested segment IDs, the server MUST ignore the request. This timer is configurable such that system administrators can adjust the value based on their current network environments. By default, APP_MAX_DELAY SHOULD be set to 65 milliseconds.<7>