Scanning the surrounding networks on the web server by esp8266

Projects Programming
1

Hello
This part of the code is related to scanning the surrounding networks by esp8266. Can I implement this on a web server that has the ability to scan the network again on the same web server?

#include "ESP8266WiFi.h"

void setup() {

  Serial.begin(115200);

  int numberOfNetworks = WiFi.scanNetworks();

  for(int i =0; i<numberOfNetworks; i++){

      Serial.print("Network name: ");
      Serial.println(WiFi.SSID(i));
      Serial.print("Signal strength: ");
      Serial.println(WiFi.RSSI(i));
      Serial.println("-----------------------");

  }

}

void loop() {}
2

Could be tricky...

I believe the ESP has to disconnect from the AP before it can scan the networks.

If that is done while responding to a GET request from a client, I don't know if it will be possible to reconnect to the AP and respond successfully.

How will this be used? Will the ESP be in AP mode?

3

I know that you can keep esp in AP and STA mode at the same time with this code:

WiFi.mode(WIFI_AP_STA);

I just don't know how to do the html code related to making the scan button and its connection with this network scan code.

4

I'm not sure that's relevant.

To scan for networks, the ESP must scan each channel, and I don't know if it can remain connected to an AP on a specific channel, or act as an AP on a specific channel, at the same time as scanning the other channels.

One idea I had (although it sounds like a "kludge") would be to use a second ESP, like an ESP-01. The ESP-01 would be programmed with the standard WiFi scanner sketch (perhaps some minor modifications to the output formatting) or maybe the default AT firmware(AT+CWLAP). The first ESP (the server) would receive the data from the ESP-01 using software serial and store the data in memory, ready for responding to client requests.

5

I think it is possible to do it. As the Wifi Manager library does this. If you have worked with this library, you know that when you connect to the esp access point, you can also scan the Wi-Fi by pressing the refresh button.

Even if I can customize the wifi manager library for myself, it will be great.

6

I had forgotten that! I guess that answers your original question. It must be possible.

Have you tried to make a server code which scans the network? What happened?

7

I use this code to manage Wi-Fi networks, but the scanning part of the networks does not work, only the first time the networks are scanned. There is a scan button, but it doesn't seem to be connected to any code for rescanning.

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ESP8266WebServer.h>
#include <EEPROM.h>
 
//Variables
int i = 0;
int statusCode;
const char* ssid = "text";
const char* passphrase = "text";
String st;
String content;
 
 
//Function Decalration
bool testWifi(void);
void launchWeb(void);
void setupAP(void);
 
//Establishing Local server at port 80 whenever required
ESP8266WebServer server(80);
 
void setup()
{
 
  Serial.begin(115200); //Initialising if(DEBUG)Serial Monitor
  Serial.println();
  Serial.println("Disconnecting previously connected WiFi");
  WiFi.disconnect();
  EEPROM.begin(512); //Initialasing EEPROM
  delay(10);
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.println();
  Serial.println();
  Serial.println("Startup");
 
  //---------------------------------------- Read EEPROM for SSID and pass
  Serial.println("Reading EEPROM ssid");
 
  String esid;
  for (int i = 0; i < 32; ++i)
  {
    esid += char(EEPROM.read(i));
  }
  Serial.println();
  Serial.print("SSID: ");
  Serial.println(esid);
  Serial.println("Reading EEPROM pass");
 
  String epass = "";
  for (int i = 32; i < 96; ++i)
  {
    epass += char(EEPROM.read(i));
  }
  Serial.print("PASS: ");
  Serial.println(epass);
 
 
  WiFi.begin(esid.c_str(), epass.c_str());
  if (testWifi())
  {
    Serial.println("Succesfully Connected!!!");
    return;
  }
  else
  {
    Serial.println("Turning the HotSpot On");
    launchWeb();
    setupAP();// Setup HotSpot
  }
 
  Serial.println();
  Serial.println("Waiting.");
  
  while ((WiFi.status() != WL_CONNECTED))
  {
    Serial.print(".");
    delay(100);
    server.handleClient();
  }
 
}
void loop() {
  if ((WiFi.status() == WL_CONNECTED))
  {
 
    for (int i = 0; i < 10; i++)
    {
      digitalWrite(LED_BUILTIN, HIGH);
      delay(1000);
      digitalWrite(LED_BUILTIN, LOW);
      delay(1000);
    }
 
  }
  else
  {
  }
 
}
 
 
//-------- Fuctions used for WiFi credentials saving and connecting to it which you do not need to change 
bool testWifi(void)
{
  int c = 0;
  Serial.println("Waiting for Wifi to connect");
  while ( c < 20 ) {
    if (WiFi.status() == WL_CONNECTED)
    {
      return true;
    }
    delay(500);
    Serial.print("*");
    c++;
  }
  Serial.println("");
  Serial.println("Connect timed out, opening AP");
  return false;
}
 
void launchWeb()
{
  Serial.println("");
  if (WiFi.status() == WL_CONNECTED)
    Serial.println("WiFi connected");
  Serial.print("Local IP: ");
  Serial.println(WiFi.localIP());
  Serial.print("SoftAP IP: ");
  Serial.println(WiFi.softAPIP());
  createWebServer();
  // Start the server
  server.begin();
  Serial.println("Server started");
}
 
void setupAP(void)
{
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  if (n == 0)
    Serial.println("no networks found");
  else
  {
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i)
    {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE) ? " " : "*");
      delay(10);
    }
  }
  Serial.println("");
  st = "<ol>";
  for (int i = 0; i < n; ++i)
  {
    // Print SSID and RSSI for each network found
    st += "<li>";
    st += WiFi.SSID(i);
    st += " (";
    st += WiFi.RSSI(i);
 
    st += ")";
    st += (WiFi.encryptionType(i) == ENC_TYPE_NONE) ? " " : "*";
    st += "</li>";
  }
  st += "</ol>";
  delay(100);
  WiFi.softAP("how2electronics", "");
  Serial.println("softap");
  launchWeb();
  Serial.println("over");
}
 
void createWebServer()
{
 {
    server.on("/", []() {
 
      IPAddress ip = WiFi.softAPIP();
      String ipStr = String(ip[0]) + '.' + String(ip[1]) + '.' + String(ip[2]) + '.' + String(ip[3]);
      content = "<!DOCTYPE HTML>\r\n<html>Hello from ESP8266 at ";
      content += "<form action=\"/scan\" method=\"POST\"><input type=\"submit\" value=\"scan\"></form>";
      content += ipStr;
      content += "<p>";
      content += st;
      content += "</p><form method='get' action='setting'><label>SSID: </label><input name='ssid' length=32><input name='pass' length=64><input type='submit'></form>";
      content += "</html>";
      server.send(200, "text/html", content);
    });
    server.on("/scan", []() {
      //setupAP();
      IPAddress ip = WiFi.softAPIP();
      String ipStr = String(ip[0]) + '.' + String(ip[1]) + '.' + String(ip[2]) + '.' + String(ip[3]);
 
      content = "<!DOCTYPE HTML>\r\n<html>go back";
      server.send(200, "text/html", content);
    });
 
    server.on("/setting", []() {
      String qsid = server.arg("ssid");
      String qpass = server.arg("pass");
      if (qsid.length() > 0 && qpass.length() > 0) {
        Serial.println("clearing eeprom");
        for (int i = 0; i < 96; ++i) {
          EEPROM.write(i, 0);
        }
        Serial.println(qsid);
        Serial.println("");
        Serial.println(qpass);
        Serial.println("");
 
        Serial.println("writing eeprom ssid:");
        for (int i = 0; i < qsid.length(); ++i)
        {
          EEPROM.write(i, qsid[i]);
          Serial.print("Wrote: ");
          Serial.println(qsid[i]);
        }
        Serial.println("writing eeprom pass:");
        for (int i = 0; i < qpass.length(); ++i)
        {
          EEPROM.write(32 + i, qpass[i]);
          Serial.print("Wrote: ");
          Serial.println(qpass[i]);
        }
        EEPROM.commit();
 
        content = "{\"Success\":\"saved to eeprom... reset to boot into new wifi\"}";
        statusCode = 200;
        ESP.reset();
      } else {
        content = "{\"Error\":\"404 not found\"}";
        statusCode = 404;
        Serial.println("Sending 404");
      }
      server.sendHeader("Access-Control-Allow-Origin", "*");
      server.send(statusCode, "application/json", content);
 
    });
  } 
}
8

This is the web server of the wifi manager library. Is there a way to remove only the "info" and "update" part??

HELP
HELP411×610 41.5 KB

9

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