跨平台协议栈版本：https://github.com/junlon2006/libUartCommProtocolV2
UART Communication Protocol provides uart transmission like TCP/UDP feature
RWND = 1【low memory usage】easy way to make reliable transmission, support ACK/NACK only
protocol stack like TFTP
cover both big-endian and little-endian arch
1：TCP like: uart in 921600bps mode [symbol error rate：1bit/1000000bit, one bit error every 122KB, payload_len 512 byte] can reach 64KB/s reliable transmission【full-duplex】total memory usage about 1KB.
2：UDP like: uart in 921600bps mode, payload_len 512 byte can reach 94KB/s unreliable transmission【full-duplex】.
3：recommend payload_len max len 512 byte
int CommProtocolPacketAssembleAndSend(CommCmd cmd, char *payload,
CommPayloadLen payload_len,
CommAttribute *attribute);
Linux x86 benchmark demo, ubuntu 16.04 recommend
./build.sh
./peera
./peerb
benchmark
RT-Thread rtos下UDP模式84KB/s UART传输能力，同软硬件条件下TCP模式极限性能71KB/s，BW RATIO≈84.5%(需考虑串口连接线长度，目前几毫米级别)
协议栈性能瓶颈：（不考虑RWND=1吞吐问题，设计如此）checksum约占30%性能开销，crc16性能远低于TCP checksum算法，性能差2~3倍
tcp checksum junlon2006/linux-c#96
Uart通道下忽略该瓶颈
