UDPspeeder V2
git version: 3e248b414c    build date: Aug  5 2018 21:59:52
repository: https://github.com/wangyu-/UDPspeeder

usage:
    run as client: ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]
    run as server: ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]

common options, must be same on both sides:
    -k,--key              <string>        key for simple xor encryption. if not set, xor is disabled
main options:
    -f,--fec              x:y             forward error correction, send y redundant packets for every x packets
    --timeout             <number>        how long could a packet be held in queue before doing fec, unit: ms, default: 8ms
    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s
advanced options:
    --mode                <number>        fec-mode,available values: 0,1; mode 0(default) costs less bandwidth,no mtu problem.
                                          mode 1 usually introduces less latency, but you have to care about mtu.
    --mtu                 <number>        mtu. for mode 0, the program will split packet to segment smaller than mtu value.
                                          for mode 1, no packet will be split, the program just check if the mtu is exceed.
                                          default value: 1250. you typically shouldnt change this value.
    -q,--queue-len        <number>        fec queue len, only for mode 0, fec will be performed immediately after queue is full.
                                          default value: 200. 
    -j,--jitter           <number>        simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.
                                          do not use if you dont know what it means.
    -i,--interval         <number>        scatter each fec group to a interval of <number> ms, to protect burst packet loss.
                                          default value: 0. do not use if you dont know what it means.
    -f,--fec              x1:y1,x2:y2,..  similiar to -f/--fec above,fine-grained fec parameters,may help save bandwidth.
                                          example: "-f 1:3,2:4,10:6,20:10". check repo for details
    --random-drop         <number>        simulate packet loss, unit: 0.01%. default value: 0.
    --disable-obscure     <number>        disable obscure, to save a bit bandwidth and cpu.
developer options:
    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program, so that you
                                          can change fec encode parameters dynamically, check readme.md in repository for
                                          supported commands.
    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax
    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax
    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000
    --fix-latency         <number>        try to stabilize latency, only for mode 0
    --delay-capacity      <number>        max number of delayed packets
    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel
    --sock-buf            <number>        buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024
log and help options:
    --log-level           <number>        0: never    1: fatal   2: error   3: warn 
                                          4: info (default)      5: debug   6: trace
    --log-position                        enable file name, function name, line number in log
    --disable-color                       disable log color
    -h,--help                             print this help message

echo fec 19:9 > fifo.file
echo mtu 1100 > fifo.file
echo timeout 5 > fifo.file
echo queue-len 100 > fifo.file
echo mode 0 > fifo.file