const int baudRate = 115200; //Set the baud rate
const byte DNS_PORT = 53; //Set the DNS port number
const int webPort = 80; //Set the Web port number
const int resetPin = 0; //Set reset button pin for deleting WiFi information.
const int LED = 2; //Set LED pins
const char* AP_SSID = "NodeMCU-ESP32"; //Set the AP hotspot name
//const char* AP_PASS = ""; //set the AP hotspot password
const char* HOST_NAME = "MY_ESP32S"; //Set the device name
String scanNetworksID = ""; // for storing scanned WiFi IDs
int connectTimeOut_s = 15; //WiFi connection timeout in seconds
IPAddress apIP(192, 168, 4, 1); // Set the IP address of the AP
String wifi_ssid = ""; //Temporary storage of wifi account passwords
String wifi_pass = ""; //Temporary storage of wifi account passwords
// Define the HTML source code for the home page of the root directory.
// Define the HTML source code of the success page.
DNSServer dnsServer; // Create a dnsServer instance
WebServer server(webPort); //Enable web service, create TCP SERVER, parameters: port number, maximum number of connections.
//Initialize AP mode
void initSoftAP(){
(WIFI_AP); // Configure for AP mode
(apIP, apIP, IPAddress(255, 255, 255, 0)); //Set the AP hotspot IP and subnet mask
if((AP_SSID)){ //Enable AP hotspot, add the second parameter if you need password.
//Print related information
("ESP-32S SoftAP is right.");
("Soft-AP IP address = ");
(());
(String("MAC address = ") + ().c_str());
}else{ // Failed to turn on hotspot
("WiFiAP Failed");
delay(1000);
("restart now...");
(); //restart reset esp32
}
}
//Initialize DNS servers
void initDNS(){
// Determine if mapping all addresses to esp32's ip was successful or not
if((DNS_PORT, "*", apIP)){
("start dnsserver success.");
}else{
("start dnsserver failed.");
}
}
//Initialize WebServer
void initWebServer(){
// Set the domain name esp32 for the device, the full domain name is ????
if(("esp32")){
("MDNS responder started");
}
//Must add a second parameter HTTP_GET in the following format, otherwise the portal will not be forced.
("/", HTTP_GET, handleRoot); // When the browser requests the server root (home page) call the custom function handleRoot processing, set the home page callback function, you must add the second parameter HTTP_GET, otherwise you can not force the portal
("/configwifi", HTTP_POST, handleConfigWifi); // Call the custom function handleConfigWifi when the browser requests the server/configwifi (form field) directory.
(handleNotFound); // Call the custom function handleNotFound when the web resource requested by the browser cannot be found on the server.
//Tells the server to begin listening for incoming None
(); //Start TCP SERVER
//(true); // disable delayed sending
("WebServer started!");
}
//Scanning WiFi
bool scanWiFi(){
("scan start");
// Scan for nearby WiFi
int n = ();
("scan done");
if (n == 0) {
("no networks found");
scanNetworksID = "no networks found";
return false;
}else{
(n);
(" networks found");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
(i + 1);
(": ");
((i));
(" (");
((i));
(")");
(((i) == WIFI_AUTH_OPEN) ? " " : "*");
scanNetworksID += "<P>" + (i) + "</P>";
delay(10);
}
return true;
}
}
void connectToWiFi(int timeOut_s){
("Enter the connectToWiFi() function.");
// Set to STA mode and connect to WIFI
(WIFI_STA);
(true);//Set up automatic connection
/ / with the string member function c_str () to generate a const char * pointer to the null character to the end of the array, that is, to obtain the pointer to the string.
if(wifi_ssid !=""){
("Connect with web configuration information...");
(wifi_ssid.c_str(), wifi_pass.c_str());
wifi_ssid = "";
wifi_pass = "";
}else{
("Connect with information saved by nvs...");
();//Connect to the last successfully connected wifi
}
//(wifi_ssid.c_str(), wifi_pass.c_str());
int Connect_time = 0; // Used for connection timing, reset the device if the connection is unsuccessful for a long time
while (() != WL_CONNECTED) { //Wait for the WIFI connection to be successful
(".");
digitalWrite(LED,!digitalRead(LED));
delay(500);
Connect_time ++;
if (Connect_time > 2*timeOut_s) { //Long time not connected, re-enter the matching page
digitalWrite(LED,LOW);
("");
("WIFI autoconnect fail, start AP for webconfig now...");
wifiConfig(); // Go to the web side to manually configure wifi
return; //Skip out Prevent infinite initialization
//break; //jump to prevent infinite initialization
}
}
if(() == WL_CONNECTED){
("WIFI connect Success");
("SSID:%s", ().c_str());
(", PSW:%s\r\n", ().c_str());
("LocalIP:");
(());
(" ,GateIP:");
(());
("WIFI status is:");
(());
digitalWrite(LED,HIGH);
();
}
}
// for configuring WiFi
void wifiConfig(){
initSoftAP();
initDNS();
initWebServer();
scanWiFi();
}
//Process the access request from the root directory "/" (home page), will display the HTML page for configuring wifi.
void handleRoot(){
if (("selectSSID")){
(200, "text/html", ROOT_HTML + scanNetworksID + "</body></html>");
}else{
(200, "text/html", ROOT_HTML + scanNetworksID + "</body></html>");
}
}
void handleConfigWifi(){
//return http status
//(200, "text/html", SUCCESS_HTML);
if (("ssid")) {// Determine if there is an account parameter
("got ssid:");
wifi_ssid = ("ssid"); //Get the content of the html form input box with name "ssid".
// strcpy(sta_ssid, ("ssid").c_str());// copy account parameters into sta_ssid
(wifi_ssid);
}else{//No parameters
("error, not found ssid");
(200, "text/html", "<meta charset='UTF-8'>error, not found ssid");// Return to the error page
return;
}
//Password is the same as account number
if (("pass")) {
("got password:");
wifi_pass = ("pass"); //Get the content of the html form input box with name "pwd".
//strcpy(sta_pass, ("pass").c_str());
(wifi_pass);
}else{
("error, not found password");
(200, "text/html", "<meta charset='UTF-8'>error, not found password");
return;
}
(200, "text/html", "<meta charset='UTF-8'>SSID："+wifi_ssid+"<br />password:"+wifi_pass+"<br /> WiFi information has been obtained and is trying to connect, please close this page manually.");//Return to the save success page
delay(2000);
(true); With the //Parameter set to true, the device will directly turn off the access point mode, i.e. turn off the WiFi network established by the device.
(); //Shut down the web service
(); // Calling this function without inputting parameters will turn off the access point mode and set the currently configured AP hotspot network name and password to null values.
("WiFi Connect SSID:" + wifi_ssid + " PASS:" + wifi_pass);
if(() != WL_CONNECTED){
("Start calling the connect function connectToWiFi()...");
connectToWiFi(connectTimeOut_s);
}else{
("Submitted configuration information auto-connected successfully...");
}
}
// Set the function 'handleNotFound' to handle 404 cases.
void handleNotFound(){ // This custom function handles when the browser requests a web resource that can't be found on the server.
handleRoot(); // Return to the configuration page if you access a directory that does not exist.
// (404, "text/plain", "404: Not found");
}
//LED blinking, led for the foot number, n for the number of times, t for the time interval ms
void blinkLED(int led,int n,int t){
for(int i=0;i<2*n;i++){
digitalWrite(led,!digitalRead(led));
delay(t);
}
}
//Delete the saved wifi information and make the LED blink 5 times.
void restoreWiFi(){
delay(500);
esp_wifi_restore(); //Delete saved wifi information
("Connection information cleared, preparing to reboot device...");
delay(10);
blinkLED(LED,5,500); //LED blinks 5 times
digitalWrite(LED,LOW);
}
void checkConnect(bool reConnect){
if(() != WL_CONNECTED){
// ("WIFI not connected.") ;)
// (());
if(digitalRead(LED) != LOW){
digitalWrite(LED,LOW);
}
if(reConnect == true && () != WIFI_AP && () != WIFI_AP_STA ){
("WIFI not connected.");
("WiFi Mode:");
(());
("Connecting to WiFi...");
connectToWiFi(connectTimeOut_s);
}
}else if(digitalRead(LED) != HIGH){
digitalWrite(LED,HIGH);
}
}
void setup() {
pinMode(LED,OUTPUT); //Configure the LED port as an output port
digitalWrite(LED,LOW); //Initial light off
pinMode(resetPin, INPUT_PULLUP); // Key pull-up input mode (default high level input, pull-down to low level when pressed)
(baudRate);
(HOST_NAME); //Set the device name
connectToWiFi(connectTimeOut_s);
}
void loop() {
//Press and hold for 5 seconds (P0) to clear network configuration information
if(!digitalRead(resetPin)){
delay(5000);
if(!digitalRead(resetPin)){
("\n button has been pressed for 5 seconds, clearing the network connection.");
restoreWiFi(); //Delete saved wifi information
(); //restart reset esp32
("The device has been rebooted.");
}
}
(); // Check client DNS requests
(); //check client (browser) http requests
checkConnect(true); //Detect network connection status, the parameter true means reconnect if disconnected.
delay(30);
}