> [0] rcvbuf=[1920 1936 1952 1968 1984 2000 2016 2032 2048 2064 2080 2096 2112 2128 2144 2160 ]
> [0] second sndbuf=[0 ]
> [0] sndbuf=[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]
> [0] rcvbuf=[1920 1936 1952 1968 1984 2000 2016 2032 2048 2064 2080 2096 2112 2128 2144 2160 ]
> [0] second sndbuf=[0 ]
> [0] sndbuf=[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]