Question

这是一个有关运行以太网的arduino设备的问题，该设备可以在Linux机器上使用python在我的网络上进行访问。

arduino代码在这里：

#include <Ethernet.h>
#include <SPI.h>

#define ETH_RST 9   // ethernet reset pin
#define ETH_CS  10  // ethernet chip select

String inputString = "";

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(10, 0, 1, 18);
EthernetServer server(5000);

void setup() {
  pinMode(ETH_CS, INPUT_PULLUP);
  pinMode(ETH_RST, INPUT_PULLUP);
  pinMode(ETH_RST, OUTPUT); // should be high
  digitalWrite(ETH_RST, HIGH);  // reset is active low
  digitalWrite(ETH_RST, LOW);
  delay(1);
  digitalWrite(ETH_RST, HIGH);

  Ethernet.init(ETH_CS);  
  Ethernet.begin(mac, ip);

  Serial.begin(9600);
  delay(1000); // give it some time

  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}

void loop() {
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (c == '\n') {
      Serial.print("cmd: ");
      Serial.println(inputString);

      client.print("return: ");
      client.println(inputString);
      client.flush();

      inputString = "";
        } 
    else {
      inputString += c;
    }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    Serial.println("client disconnected");
    client.stop();
  }
}

我正在使用此python代码通过名为client.py的程序访问服务器：

#!/usr/bin/env python2.7

import socket

HOST = '10.0.1.18'
PORT = 4999

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((HOST, PORT))

while 1:
    message = raw_input(" -> ")
    if (message == 'quit'):
        break
    print ('message ' + message)
    client_socket.send(message + '\n')
    data = client_socket.recv(1024).decode() # get response
    print('Received from server: ' + data)   # show reponse

client_socket.close()  # close the connection

所以让我们运行client.py-这个会话中显示了奇怪的东西。

$ ./client.py
 -> m1
message m1
Received from server: return: 
 -> m2
message m2
Received from server: m1

 -> m3
message m3
Received from server: return: m2

 -> m4
message m4
Received from server: return: m3

 -> m5
message m5
Received from server: return: m4

 -> quit

所以我期望如果我发送m1，我会得到m1的。但是当我使用
发送消息时 client_socket.send（text）
然后执行
data = client_socket.recv（1024）.decode（）
返回的数据来自先前的send（）。我不明白。有建议吗？

Arduino以太网，Python套接字，奇怪的Recv行为

0 个答案: