Allows the client to set the amount of time (in milliseconds) that the device will sleep before sending a ping. Generally, this is the time between when a ping reply is received and when the next ping will be sent. Note that the amount of time between sending one ping and sending the next ping varies depending on whether or not you enable waiting for replies, and how long it takes to receive the reply. If waiting for replies is disabled, then this is the time between sending one ping and sending the next ping. This object may be changed while a ping is in progress.