握手问题 Tornado 服务器和 ESP32 客户端

Posted 2023-02-16

【中文标题】握手问题 Tornado 服务器和 ESP32 客户端

【英文标题】：Handshake Issues Tornado Server and ESP32 Client

【发布时间】：2021-04-29 11:27:48

【问题描述】：

我无法建立 websocket 连接。我使用 esp32 作为客户端，使用 Tornado Webserver 作为主机。 我可以使用 javascript 连接到主机，但我也可以将 esp32 连接到 websocket.org。 只有 esp32 和 Tornado Server 之间的连接不起作用。

ESP32 代码（Arduino IDE）：

#include <WiFi.h>
#include <WebSocketClient.h> //By Markus Sattler

const char* ssid     = "hadome";
const char* password = "12345678";

char path[] = "/ws";
char host[] = "192.168.178.29";
 
WebSocketClient webSocketClient;
WiFiClient client;
 
void setup() 
  Serial.begin(115200);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) 
    delay(500);
    Serial.print(".");
  
 
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
 
  delay(5000);
 
  if (client.connect(host, 3333)) 
    Serial.println("Connected");
   else 
    Serial.println("Connection failed.");
  
 
  webSocketClient.path = path;
  webSocketClient.host = host;
  
  if (webSocketClient.handshake(client)) 
    Serial.println("Handshake successful");
   else 
    Serial.println("Handshake failed.");
  
 

 
void loop() 
  String data;
 
  if (client.connected()) 
 
    webSocketClient.sendData("Info to be echoed back");
 
    webSocketClient.getData(data);
    if (data.length() > 0) 
      Serial.print("Received data: ");
      Serial.println(data);
    
 
   else 
    Serial.println("Client disconnected.");
  
 
  delay(3000);
 

Python 代码摘录（龙卷风）：

class WSHandler(tornado.websocket.WebSocketHandler):
    def check_origin(self, origin):
        return True

    def open(self):
        pass

    def on_message(self, message):
        self.write_message(message)
        

    def on_close(self):
        log('[WS] Connection was closed.')

application    = tornado.web.Application([(r'/ws', WSHandler)])

# Main program logic follows:
if __name__ == '__main__':

    # Tornado Server
    try:
        http_server = tornado.httpserver.HTTPServer(application)
        http_server.listen(3333)

        http_client = tornado.httpclient.AsyncHTTPClient()
        http_client.initialize(1)

        log("Tornado Server started")


        tornado.ioloop.IOLoop.current().spawn_callback(loop)
        tornado.ioloop.IOLoop.instance().start()
    except:
        log("Exception triggered - Tornado Server stopped.")

    finally:
        pass

ESP32 程序输出：

.......
WiFi connected
IP address: 
192.168.2.8
Connected
Waiting...
Handshake failed.

我很困惑，因为这个 javascript 程序可以完美运行 (https://www.mischianti.org/2020/12/07/websocket-on-arduino-esp8266-and-esp32-client-1/)：

var wsUri = "ws://192.168.178.29:3333/ws";
var output;

function init() 
    output = document.getElementById("output");
    testWebSocket();


function testWebSocket() 
    websocket = new WebSocket(wsUri);
    websocket.onopen = function (evt) 
       onOpen(evt)
    ;
    websocket.onclose = function (evt) 
       onClose(evt)
    ;
    websocket.onmessage = function (evt) 
       onMessage(evt)
    ;
    websocket.onerror = function (evt) 
       onError(evt)
    ;

汉尼斯此致

PS：对不起我的英语不好

【参考方案1】：

我通过使用另一个库解决了这个问题。 （我使用 Markus Sattler 的图书馆）