//====================================================== file = udpPing.c =====
//=  A UDP ping client that sends a "PING" and listens for a "PONG"           =
//=============================================================================
//=  Notes:                                                                   =
//=    1) This program conditionally compiles for Winsock and BSD sockets.    =
//=       Set the initial #define to WIN or BSD as appropriate.               =
//=    2) This program needs udpPong to be running on the other host          =
//=       Program udpPong must be started first.                              =
//=    3) This program takes command line input for udpPong host IP address   =
//=       and number of PING to send                                          =
//=    4) If a PONG response is not received, this program hangs              =
//=---------------------------------------------------------------------------=
//=  Example execution: (udpPong and udpPing running on host 127.0.0.1)       =
//=    udpPing 127.0.0.1 5                                                    =
//=    PONG received from IP = 127.0.0.1 -- RTT = 110 ms                      =
//=    PONG received from IP = 127.0.0.1 -- RTT = 110 ms                      =
//=    PONG received from IP = 127.0.0.1 -- RTT = 110 ms                      =
//=    PONG received from IP = 127.0.0.1 -- RTT = 110 ms                      =
//=    PONG received from IP = 127.0.0.1 -- RTT = 110 ms                      =
//=---------------------------------------------------------------------------=
//=  Build:                                                                   =
//=    Windows (WIN):  Borland: bcc32 udpPing.c                               =
//=                    MinGW: gcc udpPing.c -lws2_32 -o updPing               =
//=                    Visual C: cl ucpPing.c wsock32.lib                     =
//=    Unix/Mac (BSD): gcc ucpPing.c -lnsl -o ucpPing                         =
//=---------------------------------------------------------------------------=
//=  Execute: udpPing ip_addr num_ping                                        =
//=---------------------------------------------------------------------------=
//=  Author: << YOUR NAME >>                                                  =
//=          University of South Florida                                      =
//=          Email: << YOUR EMAIL ADDRESS >>                                  =
//=---------------------------------------------------------------------------=
//=  History:  << YOUR INITIALS >> (09/__/18) - Genesis (from udpClient.c)    =
//=============================================================================