ESP8266 网络服务器可以处理多少 simultaneous/consecutive 个连接？
How many simultaneous/consecutive connections can an ESP8266 Webserver handle?
所以我正在使用 ESP8266WebServer 和 ESP8266WiFiMulti 库来 运行 带有 websockets 的网页 我想弄清楚我可以拥有多少个客户端连接，以及是否有任何方法可以增加连接限制？
现在看来我可以从 单独的 IP 成功创建 三个 连接，然后在启动 fourth connection, it failed (server doesn't crash in the serial model, but fourth connection wouldn't load the webpage).
我还注意到，如果我刷新自己的 singular 连接一定次数 （不一致），它将失败加载网页。我无法破译这是否与 太多连续连接 一般情况下有关，或者如果我 使服务器负担过重 通过尝试在过快的时间内重新连接？
但总的来说，它似乎 不稳定 我真的需要一些帮助来找出原因。
这是我当前的代码：
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsServer.h>
#include <Hash.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
static const char ssid[] = "********";
static const char password[] = "********";
MDNSResponder mdns;
static void writeLED(bool);
ESP8266WiFiMulti WiFiMulti;
IPAddress ipAddressTest = (99,99,99,99);
ESP8266WebServer server(80);
WebSocketsServer webSocket = WebSocketsServer(81);
uint8_t pageHitCounter = 0;
IPAddress ipAddressOne = (99,99,99,99);
IPAddress ipAddressTwo = (99,99,99,99);
IPAddress ipAddressThree = (99,99,99,99);
IPAddress ipAddressFour = (99,99,99,99);
uint8_t rxBuff[256];
uint8_t som = 0x11;
uint8_t eom = 0x12;
uint8_t subsys;
uint8_t receivedSubsys;
uint8_t rx_byte = 0x00;
uint8_t messageLength = 0;
uint8_t receivedMessageLength = 0;
uint8_t messageContent;
uint8_t serialCurrent;
int initialCounter = 0;
boolean messageBegun = false;
boolean messageInProgress = false;
int currNumRefresh = 0;
int currMicroC = 0;
int currMicroD = 0;
int currMicroE = 0;
int currPressureC = 0;
int currPressureD = 0;
int currPressureE = 0;
int currValveStatusNumC = 0;
int currValveStatusNumD = 0;
int currValveStatusNumE = 0;
int currFluid = 0;
char statusbuf[256];
char status[] = "";
int statusIndex = 0;
String valveStatusC = "Closed";
String valveTubePropsC = "175px solid #00ADEF";
String valveColorC = "red";
String valveStatusD = "Closed";
String valveTubePropsD = "175px solid #00ADEF";
String valveColorD = "red";
String valveStatusE = "Closed";
String valveTubePropsE = "175px solid #00ADEF";
String valveColorE = "red";
uint8_t currCountdown = 0;
long prevTimeCountdown = 0;
long countdownInterval = 1000;
long countdownPostInterval = 100;
bool countdownFlag = true;
bool teensyPOWER = false;
bool pumpPOWER = false;
bool teensyLED = false;
void switchPOWERon() {
//Serial.println("TEST POWER ON");
int powerStatusLength = 1;
subsys = 0x10;
//Account for the end of message
messageLength = powerStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN POWER ON|");
//teensyLED = true;
} //end switchPOWERon
void switchPOWERoff() {
/*Very similar to switchPoweron(), removed for char space*/
} //end switchPOWERoff
void pumpPOWERon() {
//Serial.println("TEST POWER ON");
int pumpPowerStatusLength = 1;
subsys = 0x13;
//Account for the end of message
messageLength = pumpPowerStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN POWER ON|");
//teensyLED = true;
} //end switchPOWERon
void pumpPOWERoff() {
/*Very similar to pumpPoweron(), removed for char space*/
} //end switchPOWERoff
void switchLEDon() {
//Serial.println("TEST LED ON");
int ledStatusLength = 1;
subsys = 0x14;
//Account for the end of message
messageLength = ledStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN LED ON|");
//teensyLED = true;
} //end switchLEDon
void switchLEDoff() {
/*Very similar to switchLEDon(), removed for char space*/
} //end switchLEDoff
void statusUpdate(uint8_t num) {
//Valve C
if(currValveStatusNumC == 0)
{
valveColorC = "red";
valveTubePropsC = "175px solid #00ADEF";
valveStatusC = "Closed";
} //end if
else if(currValveStatusNumC == 1)
{
valveColorC = "green";
valveTubePropsC = "350px solid #00ADEF";
valveStatusC = "Open";
} //end else if
/*Valves D/E removed for char space, very similar to Valve C*/
String test = "";
test += currNumRefresh;
test += ",";
/*Preparing more variables to send to the webpage, removed for char space*/
test += ",";
test += ipAddressTest;
//Serial.print("TEST: ");
//Serial.println(ipAddressTest);
test.toCharArray(statusbuf, 256);
webSocket.sendTXT(num, statusbuf, strlen(statusbuf));
}
static const char PROGMEM INDEX_HTML[] = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
<title>Adafruit HUZZAH ESP8266</title>
<style type='text/css'>
/*CSS removed to fit maximum number of allowed characters*/
</style>
<script>
var currPressureTest = 0;
var currFluidTest = 0;
function POWERswitch(){
var POWERswitchCheck = document.getElementById('switch1').checked;
if(POWERswitchCheck){
websock.send("teensyPOWERon");
}
else if(!POWERswitchCheck) {
websock.send("teensyPOWERoff");
}
}
function FLUSHbegin(){
websock.send("pumpPOWERon");
}
function FLUSHend(){
websock.send("pumpPOWERoff");
}
function LEDswitch(){
var LEDswitchCheck = document.getElementById('myonoffswitch').checked;
if(LEDswitchCheck){
websock.send("teensyLEDon");
}
else if(!LEDswitchCheck) {
websock.send("teensyLEDoff");
}
}
var websock;
var test = "open";
var webpageHitCounter = 20;
function start() {
websock = new WebSocket('ws://' + window.location.hostname + ':81/');
websock.onopen = function(evt) {
console.log('websock open');
statusUpdate();
};
websock.onclose = function(evt) {
console.log('websock close');
};
websock.onerror = function(evt) {
console.log(evt);
};
websock.onmessage = function(evt) {
console.log(evt);
var e = document.getElementById('ledstatus');
var te = document.getElementById('myonoffswitch');
var pe = document.getElementById('switch1');
if(evt.data === 'teensyPOWERon')
{
pe.checked = 'checked';
}
else if(evt.data === 'teensyPOWERoff')
{
pe.checked = '';
}
else if(evt.data === 'pumpPOWERon')
{
}
else if(evt.data === 'pumpPOWERoff')
{
}
else if(evt.data === 'teensyLEDon')
{
te.checked = 'checked';
}
else if(evt.data === 'teensyLEDoff')
{
te.checked = '';
}
else if(evt.data === 'Update Status')
{
}
else {
console.log('status event');
var totalStatus = evt.data;
var splitStatus = totalStatus.split(',');
//Num Refresh
document.getElementById("demo").innerHTML = splitStatus[0];
/*Setting more variables from splitStatus[], removed for char space*/
}
};
}
function statusUpdate() {
websock.send("Update Status");
setTimeout('statusUpdate()', 5000);
}
</script>
</head>
<body style='background-color:#4a4a4c;' onload="start();">
<div style='text-align:center;'>
<h1 style='text-decoration: underline; color:white;'>Adafruit HUZZAH ESP8266</h1>
</div>
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<div style="clear:both;"></div>
<div class='counterContainer'>
<span id="counterText" style="color:white;"></span>
</div>
<div id='adminControls' class='adminControlsRow'>
<h2>Administrator Controls</h2>
<div id='Newbtn' class='powerSwitchContainer'>
<h2>HHIO PTT Power</h2>
<span class="switch">
<span class="switch-border1">
<span class="switch-border2">
<input id="switch1" type="checkbox" onclick='POWERswitch()' checked />
<label for="switch1"></label>
<span class="switch-top"></span>
<span class="switch-shadow"></span>
<span class="switch-handle"></span>
<span class="switch-handle-left"></span>
<span class="switch-handle-right"></span>
<span class="switch-handle-top"></span>
<span class="switch-handle-bottom"></span>
<span class="switch-handle-base"></span>
<span class="switch-led switch-led-green">
<span class="switch-led-border">
<span class="switch-led-light">
<span class="switch-led-glow"></span>
</span>
</span>
</span>
<span class="switch-led switch-led-red">
<span class="switch-led-border">
<span class="switch-led-light">
<span class="switch-led-glow"></span>
</span>
</span>
</span>
</span>
</span>
</span>
</div>
<div class='flushBtnContainer'>
<h2>Fluid Reservoir</h2>
<button id='flushBtn' onmousedown="FLUSHbegin();" onmouseup="FLUSHend();">Flush</button>
</div>
</div>
<div style='background-color:#1E1E20; clear:both;'>
<h2 style='color: white;'>LED Controls</h2>
<div id='LEDbtn' class='onoffswitch'>
<input type='checkbox' name='onoffswitch' class='onoffswitch-checkbox' id='myonoffswitch' onclick='LEDswitch()'>
<label class='onoffswitch-label' for='myonoffswitch'>
<span class='onoffswitch-inner'></span>
<span class='onoffswitch-switch'></span>
</label>
</div>
</div>
<div style='background-color:#1E1E20; color: white;'>
<h2>Num Refresh Test</h2>
<div id="demo"><h2>Let WEBSOCKET change this text</h2></div>
</div>
<div class='headerRow'>
/*Headers removed for char space*/
</div>
<div class='microswitchRow'>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchC" class="microswitchRadio" id="switchOffC" checked>
<input type="radio" name="switchC" class="microswitchRadio" id="switchOnC">
<label for="switchOffC">Detached</label>
<label for="switchOnC">Attached</label>
<span class="toggle"></span>
</div>
</div>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchD" class="microswitchRadio" id="switchOffD" checked>
<input type="radio" name="switchD" class="microswitchRadio" id="switchOnD">
<label for="switchOffD">Detached</label>
<label for="switchOnD">Attached</label>
<span class="toggle"></span>
</div>
</div>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchE" class="microswitchRadio" id="switchOffE" checked>
<input type="radio" name="switchE" class="microswitchRadio" id="switchOnE">
<label for="switchOffE">Detached</label>
<label for="switchOnE">Attached</label>
<span class="toggle"></span>
</div>
</div>
</div>
<div class='pressureRow'>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-c'></div>
<div class='gauge-data'><h1 id='pressurePercentC'>0%</h1></div>
</div>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-d'></div>
<div class='gauge-data'><h1 id='pressurePercentD'>0%</h1></div>
</div>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-e'></div>
<div class='gauge-data'><h1 id='pressurePercentE'>0%</h1></div>
</div>
</div>
<div class='valveRow'>
<div class='valveContainer'>
<div class="valveTube-c"></div>
<div class="valve-c"></div>
<div class='valve-data'><h1 id='valveStatus-c'>Closed</h1></div>
</div>
<div class='valveContainer'>
<div class="valveTube-d"></div>
<div class="valve-d"></div>
<div class='valve-data'><h1 id='valveStatus-d'>Closed</h1></div>
</div>
<div class='valveContainer'>
<div class="valveTube-e"></div>
<div class="valve-e"></div>
<div class='valve-data'><h1 id='valveStatus-e'>Closed</h1></div>
</div>
</div>
<div class='fluidContainer'>
<meter class='fluidMeter' max='100' value='50' low='25' high='75' optimum='100'></meter>
<div class='fluid-data'><h1 id='fluidPercent'>0%</h1></div>
</div>
</body>
</html>
)rawliteral";
const int LEDPIN = 0;
// Current POWER status
bool POWERStatus;
// Current LED status
bool LEDStatus;
// Commands sent through Web Socket
/*command array declarations removed for char space*/
const char statusIdentifier[] = "Update Status";
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{
//Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type);
switch(type) {
case WStype_DISCONNECTED:
//Serial.printf("[%u] Disconnected!\r\n", num);
break;
case WStype_CONNECTED:
{
IPAddress ip = webSocket.remoteIP(num);
//Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);
// Send the current LED status
if (LEDStatus) {
webSocket.sendTXT(num, LEDON, strlen(LEDON));
}
else if(!LEDStatus) {
webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF));
}
else if(teensyPOWER) {
webSocket.sendTXT(num, teensyPOWERON, strlen(teensyPOWERON));
}
else if(!teensyPOWER) {
webSocket.sendTXT(num, teensyPOWEROFF, strlen(teensyPOWEROFF));
}
else if(pumpPOWER) {
webSocket.sendTXT(num, teensyPOWERON, strlen(teensyPOWERON));
}
else if(!pumpPOWER) {
webSocket.sendTXT(num, pumpPOWEROFF, strlen(pumpPOWEROFF));
}
else if(teensyLED) {
webSocket.sendTXT(num, teensyLEDON, strlen(teensyLEDON));
}
else if(!teensyLED) {
webSocket.sendTXT(num, teensyLEDOFF, strlen(teensyLEDOFF));
}
}
break;
case WStype_TEXT:
//Serial.printf("[%u] get Text: %s\r\n", num, payload);
if (strcmp(LEDON, (const char *)payload) == 0) {
writeLED(true);
}
else if (strcmp(LEDOFF, (const char *)payload) == 0) {
writeLED(false);
}
else if(strcmp(teensyPOWERON, (const char *)payload) == 0) {
switchPOWERon();
}
else if(strcmp(teensyPOWEROFF, (const char *)payload) == 0) {
switchPOWERoff();
}
else if(strcmp(pumpPOWERON, (const char *)payload) == 0) {
pumpPOWERon();
}
else if(strcmp(pumpPOWEROFF, (const char *)payload) == 0) {
pumpPOWERoff();
}
else if(strcmp(teensyLEDON, (const char *)payload) == 0) {
switchLEDon();
}
else if(strcmp(teensyLEDOFF, (const char *)payload) == 0) {
switchLEDoff();
}
else if(strcmp(statusIdentifier, (const char *)payload) == 0) {
statusUpdate(num);
}
else {
//Serial.println("Unknown command");
}
// send data to all connected clients
webSocket.broadcastTXT(payload, length);
break;
case WStype_BIN:
//Serial.printf("[%u] get binary length: %u\r\n", num, length);
hexdump(payload, length);
// echo data back to browser
webSocket.sendBIN(num, payload, length);
break;
default:
//Serial.printf("Invalid WStype [%d]\r\n", type);
break;
}
}
void handleRoot()
{
server.send(200, "text/html", INDEX_HTML);
if(ipAddressTest != (0,0,0,0))
{
if(ipAddressOne == (99,99,99,99))
{
ipAddressOne = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("1st NEW IP: ");
Serial.println(ipAddressTest);
}
else if(ipAddressTwo == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest)
{
Serial.print("Old Connection-1 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressTwo = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("2nd NEW IP: ");
Serial.println(ipAddressTest);
}
}
else if(ipAddressThree == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest)
{
Serial.print("Old Connection-2 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressThree = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("3rd NEW IP: ");
Serial.println(ipAddressTest);
}
}
else if(ipAddressFour == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest || ipAddressThree == ipAddressTest)
{
Serial.println("Old Connection-3 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressFour = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("4th NEW IP: ");
Serial.println(ipAddressTest);
}
}
else
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest || ipAddressThree == ipAddressTest || ipAddressFour == ipAddressTest)
{
Serial.println("Old Connection-4 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
Serial.print("Too many connections! Attempting to Connect: ");
Serial.println(ipAddressTest);
}
}
}
}
void handleNotFound()
{
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
}
static void writeLED(bool LEDon)
{
LEDStatus = LEDon;
// Note inverted logic for Adafruit HUZZAH board
if (LEDon) {
digitalWrite(LEDPIN, 0);
}
else {
digitalWrite(LEDPIN, 1);
}
}
void setup()
{
pinMode(LEDPIN, OUTPUT);
writeLED(false);
Serial.begin(115200);
//Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
currCountdown = 4;
for(uint8_t t = 4; t > 0; t--) {
unsigned long currTime = millis();
if(countdownFlag == true)
{
Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t);
Serial.flush();
countdownFlag = false;
}
if(currTime - prevTimeCountdown > countdownInterval)
{
prevTimeCountdown = currTime;
countdownFlag = true;
} //end if
else
{
t++;
} //end else
} //end for
WiFiMulti.addAP(ssid, password);
/*
prevTimeCountdown = 0;
countdownFlag = true;
*/
while(WiFiMulti.run() != WL_CONNECTED) {
/*
unsigned long currTime = millis();
if(countdownFlag == true)
{
Serial.print(".");
countdownFlag = false;
} //end if
if(currTime - prevTimeCountdown > countdownInterval)
{
prevTimeCountdown = currTime;
countdownFlag = true;
} //end if
*/
Serial.print(".");
delay(1000);
} //end while
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (mdns.begin("espWebSock", WiFi.localIP())) {
Serial.println("MDNS responder started");
mdns.addService("http", "tcp", 80);
mdns.addService("ws", "tcp", 81);
}
else {
Serial.println("MDNS.begin failed");
}
Serial.print("Connect to http://espWebSock.local or http://");
Serial.println(WiFi.localIP());
server.on("/", handleRoot);
server.onNotFound(handleNotFound);
server.begin();
webSocket.begin();
webSocket.onEvent(webSocketEvent);
}
void loop()
{
//Communication Protocol
if(Serial.available() > 0)
{
//Serial.print("SERIAL.AVAILABLE: ");
//Serial.println(Serial.available());
if(initialCounter == 0)
{
rx_byte = Serial.read();
/*
//Print Start of Message
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rx_byte, HEX);
*/
//Serial.println(rx_byte, BIN);
//Serial.println(rx_byte);
initialCounter++;
}
if((!messageBegun) && (rx_byte == som))
{
messageBegun = true;
//Serial.println("MESSAGE BEGUN TRUE");
} //end if (messageInProgress && rx_byte)
if((messageBegun) && (!messageInProgress))
{
serialCurrent = Serial.available();
if(serialCurrent > 0)
{
receivedMessageLength = (uint8_t)Serial.read();
/*
Serial.print("MESSAGE LENGTH: ");
Serial.println(receivedMessageLength);
*/
messageBegun = false;
messageInProgress = true;
//Serial.println("MESSAGE IN PROGRESS TRUE");
} //end if (serialCurrent)
} //end if (messageBegun && messageInProgress)
if(messageInProgress)
{
serialCurrent = Serial.available();
if(serialCurrent >= receivedMessageLength)
{
Serial.readBytes(rxBuff, receivedMessageLength);
if((byte)rxBuff[receivedMessageLength-1] != eom)
{
//Serial.println("ERROR");
//Serial.write(Serial.read());
} //end if (rxBuff != eom)
else
{
messageInProgress = false;
for(int i=0; i<receivedMessageLength; i++)
{
if(rxBuff[i] == eom)
{
/*
//Print End of Message
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rxBuff[i], HEX);
*/
initialCounter = 0;
receivedMessageLength = 0;
} //end if
else if(i == 0)
{
receivedSubsys = rxBuff[i];
/*
//Print Subsystem
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rxBuff[i], HEX);
*/
} //end if
else
{
if(receivedSubsys == 0x14)
{
currNumRefresh = rxBuff[i];
} //end if
/*Other subsystems removed for char space*/
} //end else
} //end if (serialCurrent)
} //end if (messageInProgress)
} //end if (Serial.available)
webSocket.loop();
ipAddressTest = server.handleClient();
}
P.S。我稍微修改了 ESP8266WebServer.cpp 的 handleClient() 函数以 return 当前 IP 地址以跟踪个人用户，但有时我得到 0.0.0.0 作为 IP 地址，我不知道为什么或如何判断该 IP 是否为新 IP。
我认为 Espressif 文档建议最多 5 个 UDP/TCP 连接，这是每个人总是提到的。我会查找它，但我现在在防火墙后面:)
你没有提到你使用的是哪个环境，但我猜是基于 Arduino 的。
我不知道你为什么达到 3 个而不是 5 个的限制，可能是你在使用其他协议的连接？我不确定 MDNS 的功能是什么，所以也许其中有一些东西。此外，您的浏览器可能会打开比您预期更多的连接（使用浏览器调试功能进行调试，例如 f12？在大多数情况下）。
像往常一样，将您的代码最小化到最小的示例会有所帮助，只尝试网络服务器，看看您是否接近 5:)
好吧，我似乎已经通过使用 FS.h 库并拥有一个带有目录的实际文件系统来解决问题，我可以在其中拥有实际的 html/css/js 文件和其他文件。这似乎已经解决了稳定性问题。
您必须注意使用 FS.h 上传的文件的大小。根据大小，生成页面时会产生一些问题
所以我正在使用 ESP8266WebServer 和 ESP8266WiFiMulti 库来 运行 带有 websockets 的网页 我想弄清楚我可以拥有多少个客户端连接，以及是否有任何方法可以增加连接限制？
现在看来我可以从 单独的 IP 成功创建 三个 连接，然后在启动 fourth connection, it failed (server doesn't crash in the serial model, but fourth connection wouldn't load the webpage).
我还注意到，如果我刷新自己的 singular 连接一定次数 （不一致），它将失败加载网页。我无法破译这是否与 太多连续连接 一般情况下有关，或者如果我 使服务器负担过重 通过尝试在过快的时间内重新连接？
但总的来说，它似乎 不稳定 我真的需要一些帮助来找出原因。
这是我当前的代码：
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsServer.h>
#include <Hash.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
static const char ssid[] = "********";
static const char password[] = "********";
MDNSResponder mdns;
static void writeLED(bool);
ESP8266WiFiMulti WiFiMulti;
IPAddress ipAddressTest = (99,99,99,99);
ESP8266WebServer server(80);
WebSocketsServer webSocket = WebSocketsServer(81);
uint8_t pageHitCounter = 0;
IPAddress ipAddressOne = (99,99,99,99);
IPAddress ipAddressTwo = (99,99,99,99);
IPAddress ipAddressThree = (99,99,99,99);
IPAddress ipAddressFour = (99,99,99,99);
uint8_t rxBuff[256];
uint8_t som = 0x11;
uint8_t eom = 0x12;
uint8_t subsys;
uint8_t receivedSubsys;
uint8_t rx_byte = 0x00;
uint8_t messageLength = 0;
uint8_t receivedMessageLength = 0;
uint8_t messageContent;
uint8_t serialCurrent;
int initialCounter = 0;
boolean messageBegun = false;
boolean messageInProgress = false;
int currNumRefresh = 0;
int currMicroC = 0;
int currMicroD = 0;
int currMicroE = 0;
int currPressureC = 0;
int currPressureD = 0;
int currPressureE = 0;
int currValveStatusNumC = 0;
int currValveStatusNumD = 0;
int currValveStatusNumE = 0;
int currFluid = 0;
char statusbuf[256];
char status[] = "";
int statusIndex = 0;
String valveStatusC = "Closed";
String valveTubePropsC = "175px solid #00ADEF";
String valveColorC = "red";
String valveStatusD = "Closed";
String valveTubePropsD = "175px solid #00ADEF";
String valveColorD = "red";
String valveStatusE = "Closed";
String valveTubePropsE = "175px solid #00ADEF";
String valveColorE = "red";
uint8_t currCountdown = 0;
long prevTimeCountdown = 0;
long countdownInterval = 1000;
long countdownPostInterval = 100;
bool countdownFlag = true;
bool teensyPOWER = false;
bool pumpPOWER = false;
bool teensyLED = false;
void switchPOWERon() {
//Serial.println("TEST POWER ON");
int powerStatusLength = 1;
subsys = 0x10;
//Account for the end of message
messageLength = powerStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN POWER ON|");
//teensyLED = true;
} //end switchPOWERon
void switchPOWERoff() {
/*Very similar to switchPoweron(), removed for char space*/
} //end switchPOWERoff
void pumpPOWERon() {
//Serial.println("TEST POWER ON");
int pumpPowerStatusLength = 1;
subsys = 0x13;
//Account for the end of message
messageLength = pumpPowerStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN POWER ON|");
//teensyLED = true;
} //end switchPOWERon
void pumpPOWERoff() {
/*Very similar to pumpPoweron(), removed for char space*/
} //end switchPOWERoff
void switchLEDon() {
//Serial.println("TEST LED ON");
int ledStatusLength = 1;
subsys = 0x14;
//Account for the end of message
messageLength = ledStatusLength + 2;
messageContent = 1;
Serial.write(som);
Serial.write(messageLength);
Serial.write(subsys);
Serial.write(messageContent);
Serial.write(eom);
//Serial.println("");
//Serial.println("TURN LED ON|");
//teensyLED = true;
} //end switchLEDon
void switchLEDoff() {
/*Very similar to switchLEDon(), removed for char space*/
} //end switchLEDoff
void statusUpdate(uint8_t num) {
//Valve C
if(currValveStatusNumC == 0)
{
valveColorC = "red";
valveTubePropsC = "175px solid #00ADEF";
valveStatusC = "Closed";
} //end if
else if(currValveStatusNumC == 1)
{
valveColorC = "green";
valveTubePropsC = "350px solid #00ADEF";
valveStatusC = "Open";
} //end else if
/*Valves D/E removed for char space, very similar to Valve C*/
String test = "";
test += currNumRefresh;
test += ",";
/*Preparing more variables to send to the webpage, removed for char space*/
test += ",";
test += ipAddressTest;
//Serial.print("TEST: ");
//Serial.println(ipAddressTest);
test.toCharArray(statusbuf, 256);
webSocket.sendTXT(num, statusbuf, strlen(statusbuf));
}
static const char PROGMEM INDEX_HTML[] = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
<title>Adafruit HUZZAH ESP8266</title>
<style type='text/css'>
/*CSS removed to fit maximum number of allowed characters*/
</style>
<script>
var currPressureTest = 0;
var currFluidTest = 0;
function POWERswitch(){
var POWERswitchCheck = document.getElementById('switch1').checked;
if(POWERswitchCheck){
websock.send("teensyPOWERon");
}
else if(!POWERswitchCheck) {
websock.send("teensyPOWERoff");
}
}
function FLUSHbegin(){
websock.send("pumpPOWERon");
}
function FLUSHend(){
websock.send("pumpPOWERoff");
}
function LEDswitch(){
var LEDswitchCheck = document.getElementById('myonoffswitch').checked;
if(LEDswitchCheck){
websock.send("teensyLEDon");
}
else if(!LEDswitchCheck) {
websock.send("teensyLEDoff");
}
}
var websock;
var test = "open";
var webpageHitCounter = 20;
function start() {
websock = new WebSocket('ws://' + window.location.hostname + ':81/');
websock.onopen = function(evt) {
console.log('websock open');
statusUpdate();
};
websock.onclose = function(evt) {
console.log('websock close');
};
websock.onerror = function(evt) {
console.log(evt);
};
websock.onmessage = function(evt) {
console.log(evt);
var e = document.getElementById('ledstatus');
var te = document.getElementById('myonoffswitch');
var pe = document.getElementById('switch1');
if(evt.data === 'teensyPOWERon')
{
pe.checked = 'checked';
}
else if(evt.data === 'teensyPOWERoff')
{
pe.checked = '';
}
else if(evt.data === 'pumpPOWERon')
{
}
else if(evt.data === 'pumpPOWERoff')
{
}
else if(evt.data === 'teensyLEDon')
{
te.checked = 'checked';
}
else if(evt.data === 'teensyLEDoff')
{
te.checked = '';
}
else if(evt.data === 'Update Status')
{
}
else {
console.log('status event');
var totalStatus = evt.data;
var splitStatus = totalStatus.split(',');
//Num Refresh
document.getElementById("demo").innerHTML = splitStatus[0];
/*Setting more variables from splitStatus[], removed for char space*/
}
};
}
function statusUpdate() {
websock.send("Update Status");
setTimeout('statusUpdate()', 5000);
}
</script>
</head>
<body style='background-color:#4a4a4c;' onload="start();">
<div style='text-align:center;'>
<h1 style='text-decoration: underline; color:white;'>Adafruit HUZZAH ESP8266</h1>
</div>
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<div style="clear:both;"></div>
<div class='counterContainer'>
<span id="counterText" style="color:white;"></span>
</div>
<div id='adminControls' class='adminControlsRow'>
<h2>Administrator Controls</h2>
<div id='Newbtn' class='powerSwitchContainer'>
<h2>HHIO PTT Power</h2>
<span class="switch">
<span class="switch-border1">
<span class="switch-border2">
<input id="switch1" type="checkbox" onclick='POWERswitch()' checked />
<label for="switch1"></label>
<span class="switch-top"></span>
<span class="switch-shadow"></span>
<span class="switch-handle"></span>
<span class="switch-handle-left"></span>
<span class="switch-handle-right"></span>
<span class="switch-handle-top"></span>
<span class="switch-handle-bottom"></span>
<span class="switch-handle-base"></span>
<span class="switch-led switch-led-green">
<span class="switch-led-border">
<span class="switch-led-light">
<span class="switch-led-glow"></span>
</span>
</span>
</span>
<span class="switch-led switch-led-red">
<span class="switch-led-border">
<span class="switch-led-light">
<span class="switch-led-glow"></span>
</span>
</span>
</span>
</span>
</span>
</span>
</div>
<div class='flushBtnContainer'>
<h2>Fluid Reservoir</h2>
<button id='flushBtn' onmousedown="FLUSHbegin();" onmouseup="FLUSHend();">Flush</button>
</div>
</div>
<div style='background-color:#1E1E20; clear:both;'>
<h2 style='color: white;'>LED Controls</h2>
<div id='LEDbtn' class='onoffswitch'>
<input type='checkbox' name='onoffswitch' class='onoffswitch-checkbox' id='myonoffswitch' onclick='LEDswitch()'>
<label class='onoffswitch-label' for='myonoffswitch'>
<span class='onoffswitch-inner'></span>
<span class='onoffswitch-switch'></span>
</label>
</div>
</div>
<div style='background-color:#1E1E20; color: white;'>
<h2>Num Refresh Test</h2>
<div id="demo"><h2>Let WEBSOCKET change this text</h2></div>
</div>
<div class='headerRow'>
/*Headers removed for char space*/
</div>
<div class='microswitchRow'>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchC" class="microswitchRadio" id="switchOffC" checked>
<input type="radio" name="switchC" class="microswitchRadio" id="switchOnC">
<label for="switchOffC">Detached</label>
<label for="switchOnC">Attached</label>
<span class="toggle"></span>
</div>
</div>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchD" class="microswitchRadio" id="switchOffD" checked>
<input type="radio" name="switchD" class="microswitchRadio" id="switchOnD">
<label for="switchOffD">Detached</label>
<label for="switchOnD">Attached</label>
<span class="toggle"></span>
</div>
</div>
<div class="microswitchContainer">
<div class="microswitch white">
<input type="radio" name="switchE" class="microswitchRadio" id="switchOffE" checked>
<input type="radio" name="switchE" class="microswitchRadio" id="switchOnE">
<label for="switchOffE">Detached</label>
<label for="switchOnE">Attached</label>
<span class="toggle"></span>
</div>
</div>
</div>
<div class='pressureRow'>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-c'></div>
<div class='gauge-data'><h1 id='pressurePercentC'>0%</h1></div>
</div>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-d'></div>
<div class='gauge-data'><h1 id='pressurePercentD'>0%</h1></div>
</div>
<div class='pressureContainer'>
<div class='gauge-a'></div>
<div class='gauge-b'></div>
<div class='gauge-e'></div>
<div class='gauge-data'><h1 id='pressurePercentE'>0%</h1></div>
</div>
</div>
<div class='valveRow'>
<div class='valveContainer'>
<div class="valveTube-c"></div>
<div class="valve-c"></div>
<div class='valve-data'><h1 id='valveStatus-c'>Closed</h1></div>
</div>
<div class='valveContainer'>
<div class="valveTube-d"></div>
<div class="valve-d"></div>
<div class='valve-data'><h1 id='valveStatus-d'>Closed</h1></div>
</div>
<div class='valveContainer'>
<div class="valveTube-e"></div>
<div class="valve-e"></div>
<div class='valve-data'><h1 id='valveStatus-e'>Closed</h1></div>
</div>
</div>
<div class='fluidContainer'>
<meter class='fluidMeter' max='100' value='50' low='25' high='75' optimum='100'></meter>
<div class='fluid-data'><h1 id='fluidPercent'>0%</h1></div>
</div>
</body>
</html>
)rawliteral";
const int LEDPIN = 0;
// Current POWER status
bool POWERStatus;
// Current LED status
bool LEDStatus;
// Commands sent through Web Socket
/*command array declarations removed for char space*/
const char statusIdentifier[] = "Update Status";
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{
//Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type);
switch(type) {
case WStype_DISCONNECTED:
//Serial.printf("[%u] Disconnected!\r\n", num);
break;
case WStype_CONNECTED:
{
IPAddress ip = webSocket.remoteIP(num);
//Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);
// Send the current LED status
if (LEDStatus) {
webSocket.sendTXT(num, LEDON, strlen(LEDON));
}
else if(!LEDStatus) {
webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF));
}
else if(teensyPOWER) {
webSocket.sendTXT(num, teensyPOWERON, strlen(teensyPOWERON));
}
else if(!teensyPOWER) {
webSocket.sendTXT(num, teensyPOWEROFF, strlen(teensyPOWEROFF));
}
else if(pumpPOWER) {
webSocket.sendTXT(num, teensyPOWERON, strlen(teensyPOWERON));
}
else if(!pumpPOWER) {
webSocket.sendTXT(num, pumpPOWEROFF, strlen(pumpPOWEROFF));
}
else if(teensyLED) {
webSocket.sendTXT(num, teensyLEDON, strlen(teensyLEDON));
}
else if(!teensyLED) {
webSocket.sendTXT(num, teensyLEDOFF, strlen(teensyLEDOFF));
}
}
break;
case WStype_TEXT:
//Serial.printf("[%u] get Text: %s\r\n", num, payload);
if (strcmp(LEDON, (const char *)payload) == 0) {
writeLED(true);
}
else if (strcmp(LEDOFF, (const char *)payload) == 0) {
writeLED(false);
}
else if(strcmp(teensyPOWERON, (const char *)payload) == 0) {
switchPOWERon();
}
else if(strcmp(teensyPOWEROFF, (const char *)payload) == 0) {
switchPOWERoff();
}
else if(strcmp(pumpPOWERON, (const char *)payload) == 0) {
pumpPOWERon();
}
else if(strcmp(pumpPOWEROFF, (const char *)payload) == 0) {
pumpPOWERoff();
}
else if(strcmp(teensyLEDON, (const char *)payload) == 0) {
switchLEDon();
}
else if(strcmp(teensyLEDOFF, (const char *)payload) == 0) {
switchLEDoff();
}
else if(strcmp(statusIdentifier, (const char *)payload) == 0) {
statusUpdate(num);
}
else {
//Serial.println("Unknown command");
}
// send data to all connected clients
webSocket.broadcastTXT(payload, length);
break;
case WStype_BIN:
//Serial.printf("[%u] get binary length: %u\r\n", num, length);
hexdump(payload, length);
// echo data back to browser
webSocket.sendBIN(num, payload, length);
break;
default:
//Serial.printf("Invalid WStype [%d]\r\n", type);
break;
}
}
void handleRoot()
{
server.send(200, "text/html", INDEX_HTML);
if(ipAddressTest != (0,0,0,0))
{
if(ipAddressOne == (99,99,99,99))
{
ipAddressOne = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("1st NEW IP: ");
Serial.println(ipAddressTest);
}
else if(ipAddressTwo == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest)
{
Serial.print("Old Connection-1 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressTwo = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("2nd NEW IP: ");
Serial.println(ipAddressTest);
}
}
else if(ipAddressThree == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest)
{
Serial.print("Old Connection-2 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressThree = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("3rd NEW IP: ");
Serial.println(ipAddressTest);
}
}
else if(ipAddressFour == (99,99,99,99))
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest || ipAddressThree == ipAddressTest)
{
Serial.println("Old Connection-3 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
ipAddressFour = ipAddressTest;
pageHitCounter++;
//server.send(200, "text/html", INDEX_HTML);
Serial.print("4th NEW IP: ");
Serial.println(ipAddressTest);
}
}
else
{
if(ipAddressOne == ipAddressTest || ipAddressTwo == ipAddressTest || ipAddressThree == ipAddressTest || ipAddressFour == ipAddressTest)
{
Serial.println("Old Connection-4 currently connected; Current Connection: ");
Serial.println(ipAddressTest);
//server.send(200, "text/html", INDEX_HTML);
}
else
{
Serial.print("Too many connections! Attempting to Connect: ");
Serial.println(ipAddressTest);
}
}
}
}
void handleNotFound()
{
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
}
static void writeLED(bool LEDon)
{
LEDStatus = LEDon;
// Note inverted logic for Adafruit HUZZAH board
if (LEDon) {
digitalWrite(LEDPIN, 0);
}
else {
digitalWrite(LEDPIN, 1);
}
}
void setup()
{
pinMode(LEDPIN, OUTPUT);
writeLED(false);
Serial.begin(115200);
//Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
currCountdown = 4;
for(uint8_t t = 4; t > 0; t--) {
unsigned long currTime = millis();
if(countdownFlag == true)
{
Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t);
Serial.flush();
countdownFlag = false;
}
if(currTime - prevTimeCountdown > countdownInterval)
{
prevTimeCountdown = currTime;
countdownFlag = true;
} //end if
else
{
t++;
} //end else
} //end for
WiFiMulti.addAP(ssid, password);
/*
prevTimeCountdown = 0;
countdownFlag = true;
*/
while(WiFiMulti.run() != WL_CONNECTED) {
/*
unsigned long currTime = millis();
if(countdownFlag == true)
{
Serial.print(".");
countdownFlag = false;
} //end if
if(currTime - prevTimeCountdown > countdownInterval)
{
prevTimeCountdown = currTime;
countdownFlag = true;
} //end if
*/
Serial.print(".");
delay(1000);
} //end while
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (mdns.begin("espWebSock", WiFi.localIP())) {
Serial.println("MDNS responder started");
mdns.addService("http", "tcp", 80);
mdns.addService("ws", "tcp", 81);
}
else {
Serial.println("MDNS.begin failed");
}
Serial.print("Connect to http://espWebSock.local or http://");
Serial.println(WiFi.localIP());
server.on("/", handleRoot);
server.onNotFound(handleNotFound);
server.begin();
webSocket.begin();
webSocket.onEvent(webSocketEvent);
}
void loop()
{
//Communication Protocol
if(Serial.available() > 0)
{
//Serial.print("SERIAL.AVAILABLE: ");
//Serial.println(Serial.available());
if(initialCounter == 0)
{
rx_byte = Serial.read();
/*
//Print Start of Message
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rx_byte, HEX);
*/
//Serial.println(rx_byte, BIN);
//Serial.println(rx_byte);
initialCounter++;
}
if((!messageBegun) && (rx_byte == som))
{
messageBegun = true;
//Serial.println("MESSAGE BEGUN TRUE");
} //end if (messageInProgress && rx_byte)
if((messageBegun) && (!messageInProgress))
{
serialCurrent = Serial.available();
if(serialCurrent > 0)
{
receivedMessageLength = (uint8_t)Serial.read();
/*
Serial.print("MESSAGE LENGTH: ");
Serial.println(receivedMessageLength);
*/
messageBegun = false;
messageInProgress = true;
//Serial.println("MESSAGE IN PROGRESS TRUE");
} //end if (serialCurrent)
} //end if (messageBegun && messageInProgress)
if(messageInProgress)
{
serialCurrent = Serial.available();
if(serialCurrent >= receivedMessageLength)
{
Serial.readBytes(rxBuff, receivedMessageLength);
if((byte)rxBuff[receivedMessageLength-1] != eom)
{
//Serial.println("ERROR");
//Serial.write(Serial.read());
} //end if (rxBuff != eom)
else
{
messageInProgress = false;
for(int i=0; i<receivedMessageLength; i++)
{
if(rxBuff[i] == eom)
{
/*
//Print End of Message
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rxBuff[i], HEX);
*/
initialCounter = 0;
receivedMessageLength = 0;
} //end if
else if(i == 0)
{
receivedSubsys = rxBuff[i];
/*
//Print Subsystem
Serial.print("0x");
if(rx_byte<0x10)
{
Serial.print("0");
}
Serial.println(rxBuff[i], HEX);
*/
} //end if
else
{
if(receivedSubsys == 0x14)
{
currNumRefresh = rxBuff[i];
} //end if
/*Other subsystems removed for char space*/
} //end else
} //end if (serialCurrent)
} //end if (messageInProgress)
} //end if (Serial.available)
webSocket.loop();
ipAddressTest = server.handleClient();
}
P.S。我稍微修改了 ESP8266WebServer.cpp 的 handleClient() 函数以 return 当前 IP 地址以跟踪个人用户，但有时我得到 0.0.0.0 作为 IP 地址，我不知道为什么或如何判断该 IP 是否为新 IP。
我认为 Espressif 文档建议最多 5 个 UDP/TCP 连接，这是每个人总是提到的。我会查找它，但我现在在防火墙后面:)
你没有提到你使用的是哪个环境，但我猜是基于 Arduino 的。
我不知道你为什么达到 3 个而不是 5 个的限制，可能是你在使用其他协议的连接？我不确定 MDNS 的功能是什么，所以也许其中有一些东西。此外，您的浏览器可能会打开比您预期更多的连接（使用浏览器调试功能进行调试，例如 f12？在大多数情况下）。
像往常一样，将您的代码最小化到最小的示例会有所帮助，只尝试网络服务器，看看您是否接近 5:)
好吧，我似乎已经通过使用 FS.h 库并拥有一个带有目录的实际文件系统来解决问题，我可以在其中拥有实际的 html/css/js 文件和其他文件。这似乎已经解决了稳定性问题。
您必须注意使用 FS.h 上传的文件的大小。根据大小，生成页面时会产生一些问题