MicroPython单线程多路IO复用select.poll TCPserver透传

参考文章：Python全栈工程师（22：Socket编程11-Select解析Socket通信）_python 详细select socket-优快云博客文章浏览阅读591次。Python中有一个select模块，其中提供了：select、poll、epoll三个方法，分别调用系统的 select，poll，epoll 从而实现IO多路复用。Windows Python： 提供： selectMac Python： 提供： selectLinux Python： 提供： select、poll、epoll注意：网络操作、文件操作、终..._python 详细select sockethttps://blog.youkuaiyun.com/Julialove102123/article/details/80175209https://blog.youkuaiyun.com/Julialove102123/article/details/80175209https://blog.youkuaiyun.com/Julialove102123/article/details/80175209https://blog.youkuaiyun.com/Julialove102123/article/details/80175209https://blog.youkuaiyun.com/Julialove102123/article/details/80175209

Modbus协议与Python_python modbus-优快云博客文章浏览阅读2.7k次，点赞28次，收藏51次。使用python建立modbus通讯，讲解modbus基本原理，如何使用python搭建从站与主站，如何进行对浮点数进行读写。_python modbushttps://blog.youkuaiyun.com/weixin_46184311/article/details/140431267https://blog.youkuaiyun.com/weixin_46184311/article/details/140431267https://blog.youkuaiyun.com/weixin_46184311/article/details/140431267https://blog.youkuaiyun.com/weixin_46184311/article/details/140431267https://blog.youkuaiyun.com/weixin_46184311/article/details/140431267

字节内的位序有2种排列选左低右高:micropython-modbus才能适配modbus poll、kepware、modscan-优快云博客文章浏览阅读665次，点赞19次，收藏12次。在Python中，你可以将字节（byte）转换为布尔数组（bool array），这通常涉及到将每个字节的每个位（bit）单独处理。一个字节有8位，你可以选择将每个位转换成布尔值，或者将整个字节转换成布尔值（例如，非零字节为True，零字节为False）。问题2：限制10个TCP连接到Slaver，连接多个TCP是没问题，但是多个Master会冲突啊，本来是一主多从的结构，现在有多个Master（例如modbus poll、kepware至少有2个Master）都想从同一个Slaver存取数据，怎么办啊？https://blog.youkuaiyun.com/iot2022/article/details/145420628https://blog.youkuaiyun.com/iot2022/article/details/145420628https://blog.youkuaiyun.com/iot2022/article/details/145420628https://blog.youkuaiyun.com/iot2022/article/details/145420628https://blog.youkuaiyun.com/iot2022/article/details/145420628

""" 
Micropython 没有 queue 请用 deque
from collections import deque
"""

import select, socket, sys, network
from collections import deque

station = network.WLAN(network.STA_IF)
local_ip = station.ifconfig()[0] # IP地址st
tcp_port = 5020 # port to listen for requests/providing data

# Create a TCP/IP socket
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print(socket.AF_INET, socket.SOCK_STREAM)  # 2 1
server.setblocking(False)

# Bind the socket to the port
server_address = (local_ip, tcp_port)  # localhost = 127.0.0.1/192.168.1.108/
print(sys.stderr, "starting up on %s port %s" % server_address)
server.bind(server_address) # OSError: [Errno 112] EADDRINUSE 稍等退出port重试即可

# Listen for incoming connections
server.listen(5)

# Sockets from which we expect to read
# 开始只有服务端，后面进来新连接再放入监控列表inputs，此列表里面是空就会报错：监控什么？
inputs = [server]
print("初始监控列表里面只有1个服务端 =", inputs)

# Sockets to which we expect to write
outputs = []

message_queues = {}
while inputs:

    # Wait for at least one of the sockets to be ready for processing
    print("\nwaiting for the next event")
    # select接收任务和返回结果依据这3个列表
    readable, writable, exceptional = select.select(inputs, outputs, inputs)
    # Handle inputs
    for s in readable:
        # s是服务端，只负责接收新连接，接收数据是connection socket对象的事情
        if s is server:
            # A "readable" server socket is ready to accept a connection
            connection, client_address = s.accept()  # 有新连接请求
            print("new connection from", client_address)
            connection.setblocking(False)  # 必须是非阻塞的才能并发
            inputs.append(connection)  # 新连接交给select监控
            # Give the connection a queue for data we want to send
            # message_queues字典的Key=connection,Value=专用队列
            message_queues[connection] = deque([],10)
        else:
            data = s.recv(512)
            if data:
                # A readable client socket has data
                # s.getpeername() => AttributeError: 'socket' object has no attribute 'getpeername'
                print(sys.stderr, 'received "%s" from %s' % (data, s))