3.1.5.1.3 STATE_PING
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If (UploadSuspended is TRUE) Set State to SUSPEND Return from this state. Obtain the host from BitsHostId (if not NULL) or Origin server Send PING message to the server. If (error encountered in send) Set State to ERROR Return from this state. Receive Ack for PING response from the server. If (error encountered while receiving or reading the response info) Set State to ERROR Return from this state. Set state to FRAGMENT