Really only 10 browser requests per second possible?

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Re: Really only 10 browser requests per second possible?

By NardJ
- Fri Oct 02, 2015 1:25 pm #30374 Also tried the simpler code below, however same results.

Code: Select all#include <ESP8266WiFi.h>

const char* ssid = "...";
const char* password = "...";

WiFiServer server(80);

const char html[] PROGMEM =
  "<html><head>\n"
  "<meta name='viewport' content='width=device-width, initial-scale=1' />\n"
  "<meta http-equiv='Cache-Control' content='no-cache, no-store, must-revalidate' />\n"
  "<meta http-equiv='Pragma' content='no-cache' />\n"
  "<meta http-equiv='Expires' content='0' />\n"
  "<script src='script.js'></script>\n"
  "</head>\n"
  "<body>\n<h1 style='font-family:Lucida Console;font-size:32px'>Data request per second</h1>\n"
  "<div id='fps' style='background-color:#FFFFAA;border:1px solid black;width:112px;height:48px;text-align:center;line-height:22px;font-size:12px;'>10 fps</div>"
  "</body></html>\n";

const char js[] PROGMEM =   
    "var interval;\n"
    "var xmlhttp=new XMLHttpRequest();\n"   
    "document.addEventListener('DOMContentLoaded',init,false);\n"
    "var fC=0;\n"
    "setInterval(updateFPS,1000);\n"
    "function updateFPS(){\n"
    "  var fT = document.getElementById('fps');\n"
    "  fT.innerHTML=fC+ ' fps <br>'+aB;\n"
    "  fC=0;"
    "}\n"   
    "function init(){\n"   
    "  refresh();\n"
    "}\n"
    "var aB='';\n"
    "function refresh( ){\n"
    "  xmlhttp.onreadystatechange=function(){\n"
    "    if (xmlhttp.readyState==4 && xmlhttp.status==200){\n"
    "      fC++;\n"
    "      aB=xmlhttp.response;\n"
    "      setTimeout(refresh,0);\n"   
    "    }\n" //if
    "  }\n" //onreadystatechange
    "  xmlhttp.open('GET','/Refresh',true);\n"
    "  xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');\n"
    "  xmlhttp.send();\n"
    "}\n"
    ;


void setup() {
  Serial.begin(115200);
  delay(10);

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
 
  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
}

char msg[]={'T','E','S','T','\0'};

char* Refresh(){
  return msg;
}

WiFiClient client;
void loop() {
  // Check if a client has connected
  client = server.available();
  if (!client) return;
  Serial.print("Client found: ");
  Serial.println(client);
 
  // Wait until the client sends some data
  while(!client.available()){
    delay(1);
  }
 
  // Read the first line of the request
  String req = client.readStringUntil('\r');
  Serial.println("url: "+req);
  client.flush();
 
  // Match the request
  int val;
  String ret="";
  if (req.equals("GET / HTTP/1.1")) ret=html;
  if (req.equals("GET /script.js HTTP/1.1")) ret=js; 
  if (req.equals("GET /Refresh HTTP/1.1")) ret=Refresh();
  if (ret.equals("")){
    Serial.println("invalid request");
    ret="invalid request";
    client.stop();
    return;
  }

  client.flush();

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";//<!DOCTYPE HTML>\r\n";
  s=s+ret+"\n";
 
  // Send the response to the client
  client.print(s);
  //delay(1);
  //Serial.println("Client disconnected");

  // The client will actually be disconnected
  // when the function returns and 'client' object is detroyed
}


Pinging results in output below, so no network delay.
Code: Select allPinging 192.168.0.7 with 32 bytes of data:
Reply from 192.168.0.7: bytes=32 time=5ms TTL=254
Reply from 192.168.0.7: bytes=32 time=11ms TTL=254
Reply from 192.168.0.7: bytes=32 time=4ms TTL=254
Reply from 192.168.0.7: bytes=32 time=4ms TTL=254

Ping statistics for 192.168.0.7:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 4ms, Maximum = 11ms, Average = 6ms


I think the esp8266 is not capable of responding fast enough....or should I use another type of connection instead of xmlhttp to periodically resend updated info to a browser?
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