int send ( const void * buffer, int size, int flags = 0 ) ;
int sendto ( const void * buffer, int size, int flags, const IPAddress* to ) ;
int recv ( void * buffer, int size, int flags = 0 ) ;
int send ( const void * buffer, int size, int flags = 0 ) ;
int sendto ( const void * buffer, int size, int flags, const IPAddress* to ) ;
int recv ( void * buffer, int size, int flags = 0 ) ;