ESP8266 softAP webserver with GPS is not working.

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Module: Nodemcu
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Problem Description

When I launching only ESP8266WebServer with softAP mode, it works fine. (I could see the webpage I made.) When I checking only gps data with TinyGPS library, it works fine.

But When I add reading gps data function to my webserver routine, it doesn't work. ``

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <SoftwareSerial.h>
#include <TinyGPS.h>

//server setting
const char* ssid = "uuuu";
const char* password = "123456789";
ESP8266WebServer server(80);

//GPS setting
#define RXPIN 14
#define TXPIN 12
#define GPSBAUD 9600

TinyGPS gps;
SoftwareSerial ss(TXPIN, RXPIN);
float flat=0, flon=0;
String strDate = "";

void handleRoot() {
    server.send(200, "text/html", prepareHtmlPage());
}

String prepareHtmlPage()
{
   String htmlPage =
     String("<!DOCTYPE HTML>") +
            "<html>" +
            "<meta http-equiv=\"Content-Type\" Content=\"text/html; charset=utf-8\">\r\n" +
            "<meta name=\"viewport\" content=\"width=device-width, user-scalable=no\">\r\n"+
            "<style>body {margin: 0;font-family: Arial, Helvetica, sans-serif;}\r\n"+
            ".topnav {overflow: hidden;background-color: #333;}\r\n"+
            ".topnav a {float: left;color: #f2f2f2;text-align: center;padding: 14px 16px;text-decoration: none;font-size: 17px;}\r\n"+
            ".topnav a:hover {background-color: #ddd;color: black;}</style></head>\r\n"+
            "<body onload='status1()'>\r\n"+
            "<div class='topnav'>\r\n"+
            "<a class='active' href='#home' onclick='status1()'>현재 상태</a><a href='#about' onclick='about()'>About</a>\r\n" +
            "</div><div id='content' style='padding-left:16px'></div></body>\r\n"+
            "<div id='btm'> <input type='button' onclick='location.reload(true)' value='Refresh'> </div>\r\n"+
            "<script>\r\n"+
            "function status1()\r\n"+
            "{var str = '<h3>current : sss </h3>'\r\n;"+
            "str += '<h3> Lat, Lon : dsd </h3>'\r\n;" +
            //"{var str = '<h3>current : " + strDate + "</h3>'\r\n;"+
            //"str += '<h3> Lat, Lon : " + flat + ", " + flon + "</h3>'\r\n;" +
            "document.getElementById('btm').style.display='block'\r\n"+
            "document.getElementById('content').innerHTML = str; }\r\n"+
            "function about()\r\n"+
            "{var str = '<h2>water</h2>';\r\n"+
            "str += '<p> xxxx : xxxx </p>';str += '<p> HP : xxxxxx </p>';\r\n"+
            "document.getElementById('btm').style.display='none'\r\n"+
            "document.getElementById('content').innerHTML = str;}\r\n"+
            "</script>\r\n"+
            "</html>\r\n" +
            "\r\n";
  Serial.println(htmlPage);
  return htmlPage;
}

void setup() {
  // put your setup code here, to run once:
  delay(10);
  Serial.begin(115200);
  //ss.begin(GPSBAUD);

  Serial.println("Initializing Soft AP Config mode...");
  IPAddress Ip(192, 168, 20, 1);
  IPAddress NMask(255, 255, 255, 0);

  WiFi.softAPConfig(Ip, Ip, NMask);

  WiFi.softAP(ssid, password);
  IPAddress myIP = WiFi.softAPIP();

  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");

}

void loop() {
  // put your main code here, to run repeatedly:
  server.handleClient();
  bool newData = false;
  unsigned long chars;
  unsigned short sentences, failed;

  // For one second we parse GPS data and report some key values
  for (unsigned long start = millis(); millis() - start < 1000;)
  {
    while (ss.available())
    {
      char c = ss.read();
       //Serial.write(c); // uncomment this line if you want to see the GPS data flowing
      if (gps.encode(c)) // Did a new valid sentence come in?
        newData = true;
    }
  }

  if (newData)
  {
    unsigned long age;
    gps.f_get_position(&flat, &flon, &age);
    Serial.print(" LAT=");
    Serial.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
    Serial.print(" LON=");
    Serial.println(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
   }

  gps.stats(&chars, &sentences, &failed);
  if (chars == 0)
    Serial.println("** No characters received from GPS: check wiring **");
}

And then.

I couldn't find wifi in my wifi list in laptop.
I could check normal GPS data.

So When I comment line below "server.handleClient();", I could find nodeMCU wifi and open web page what I made.

I think this problem related with SoftwareSerial and handclient(). I'm not sure...

Please help me.

esp8266 / Arduino

ESP8266 softAP webserver with GPS is not working. #5970

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Problem Description