Arduino Uno + WifiShield : Telnet Error "Connection Refused"

Question

我的新 Arduino Uno + WifiShield 有问题。我想测试由 arduino.cc 或 Arduino-IDE“WifiChatServer”提供的示例代码:

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "ssid"; //  your network SSID (name) 
char pass[] = "password";    // your network password (use for WPA, or use      as key for WEP)

int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(9600); 
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present"); 
   // don't continue:
    while(true);
  } 

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) { 
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:    
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
  } 
  // start the server:
  server.begin();
  // you're connected now, so print out the status:
  printWifiStatus();
 }


void loop() {
 // wait for a new client:
  WiFiClient client = server.available();


  // when the client sends the first byte, say hello:
   if (client) {
    if (!alreadyConnected) {
      // clead out the input buffer:
      client.flush();    
      Serial.println("We have a new client");
      client.println("Hello, client!"); 
      alreadyConnected = true;
    } 

    if (client.available() > 0) {
      // read the bytes incoming from the client:
      char thisChar = client.read();
       // echo the bytes back to the client:
      server.write(thisChar);
      // echo the bytes to the server as well:
      Serial.write(thisChar);
    }
  }
}


void printWifiStatus() {
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

您也可以在这里查找代码:http://arduino.cc/en/Tutorial/WiFiChatServer

除了输入我的家庭 wifi 连接数据外，我没有做任何更改。将代码上传到我的 arduino 后， Controller 连接到 wifi 并打印他的 ip 地址，由我的路由器分配。 arduino 也列在路由器上连接的设备表中。

从我的笔记本电脑上 Ping arduino 成功!

尝试通过 telnet (putty) 连接到 arduino，显示错误“连接被拒绝”。我尝试连接笔记本电脑上禁用的防火墙、另一个端口 (8888/9999) 和我的智能手机，每次都出现相同的错误。

这是一个简单的 ping 和 telnet 请求的 wireshark 捕获:http://imagizer.imageshack.us/v2/800x600q90/34/ayo5.png

有没有人有解决问题的想法？

Answer 1

我有一些类似的问题(使用官方 wifi 屏蔽)。我使用早期版本的 Arduino IDE 解决了这个问题。我从 1.0.5 降级到 1.0.3 并且它有效。或许你也有同样的问题？

至少值得一试!