Reinitialize.
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Matt
183
esp32-webserver-form/esp32-webserver-form.ino
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183
esp32-webserver-form/esp32-webserver-form.ino
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/*********
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Rui Santos
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Complete project details at https://RandomNerdTutorials.com/esp32-esp8266-input-data-html-form/
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files.
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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*********/
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// include wifi password
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#include "config.h"
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#include <Arduino.h>
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#include <WiFi.h>
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#include <AsyncTCP.h>
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#include <SPIFFS.h>
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#include <Preferences.h>
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// download zip from https://github.com/me-no-dev/ESPAsyncWebServer and install.
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#include <ESPAsyncWebServer.h>
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AsyncWebServer server(80);
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// Read from config.h
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const char* ssid = WIFI_SSID;
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const char* password = WIFI_PASSWORD;
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const char* PARAM_STRING = "inputString";
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const char* PARAM_INT = "inputInt";
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const char* PARAM_FLOAT = "inputFloat";
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// HTML web page to handle 3 input fields (inputString, inputInt, inputFloat)
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const char index_html[] PROGMEM = R"rawliteral(
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<!DOCTYPE HTML><html><head>
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<title>ESP Input Form</title>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!--<script>
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function submitMessage() {
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alert("Saved value to ESP SPIFFS");
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setTimeout(function(){ document.location.reload(false); }, 500);
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}
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</script>-->
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</head><body>
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<form action="/get">
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inputString (current value %inputString%): <input type="text" name="inputString">
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<!--<input type="submit" value="Submit" ">
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</form>--><br>
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<!--<form action="/get" target="hidden-form">-->
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inputInt (current value %inputInt%): <input type="number " name="inputInt">
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<!--<input type="submit" value="Submit" ">
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</form>--><br>
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<!--<form action="/get" target="hidden-form">-->
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inputFloat (current value %inputFloat%): <input type="number " name="inputFloat">
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<input type="submit" value="Submit" ">
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</form>
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<!--<iframe style="display:none" name="hidden-form"></iframe>-->
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</body></html>)rawliteral";
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void notFound(AsyncWebServerRequest *request) {
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request->send(404, "text/plain", "Not found");
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}
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String readFile(fs::FS &fs, const char * path){
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Serial.printf("Reading file: %s\r\n", path);
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File file = fs.open(path, "r");
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if(!file || file.isDirectory()){
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Serial.println("- empty file or failed to open file");
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return String();
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}
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Serial.println("- read from file:");
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String fileContent;
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while(file.available()){
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fileContent+=String((char)file.read());
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}
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file.close();
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Serial.println(fileContent);
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return fileContent;
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}
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void writeFile(fs::FS &fs, const char * path, const char * message){
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Serial.printf("Writing file: %s\r\n", path);
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File file = fs.open(path, "w");
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if(!file){
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Serial.println("- failed to open file for writing");
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return;
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}
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if(file.print(message)){
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Serial.println("- file written");
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} else {
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Serial.println("- write failed");
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}
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file.close();
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}
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// Replaces placeholder with stored values
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String processor(const String& var){
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//Serial.println(var);
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if(var == "inputString"){
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return readFile(SPIFFS, "/inputString.txt");
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}
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else if(var == "inputInt"){
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return readFile(SPIFFS, "/inputInt.txt");
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}
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else if(var == "inputFloat"){
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return readFile(SPIFFS, "/inputFloat.txt");
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}
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return String();
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}
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void setup() {
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Serial.begin(115200);
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// Initialize SPIFFS
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#ifdef ESP32
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if(!SPIFFS.begin(true)){
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Serial.println("An Error has occurred while mounting SPIFFS");
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return;
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}
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#else
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if(!SPIFFS.begin()){
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Serial.println("An Error has occurred while mounting SPIFFS");
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return;
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}
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#endif
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WiFi.mode(WIFI_STA);
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WiFi.begin(ssid, password);
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if (WiFi.waitForConnectResult() != WL_CONNECTED) {
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Serial.println("WiFi Failed!");
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return;
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}
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Serial.println();
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Serial.print("IP Address: ");
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Serial.println(WiFi.localIP());
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// Send web page with input fields to client
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server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/html", index_html, processor);
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});
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// Send a GET request to <ESP_IP>/get?inputString=<inputMessage>
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server.on("/get", HTTP_GET, [] (AsyncWebServerRequest *request) {
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String inputMessage;
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// GET inputString value on <ESP_IP>/get?inputString=<inputMessage>
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if (request->hasParam(PARAM_STRING)) {
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inputMessage = request->getParam(PARAM_STRING)->value();
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writeFile(SPIFFS, "/inputString.txt", inputMessage.c_str());
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}
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// GET inputInt value on <ESP_IP>/get?inputInt=<inputMessage>
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else if (request->hasParam(PARAM_INT)) {
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inputMessage = request->getParam(PARAM_INT)->value();
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writeFile(SPIFFS, "/inputInt.txt", inputMessage.c_str());
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}
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// GET inputFloat value on <ESP_IP>/get?inputFloat=<inputMessage>
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else if (request->hasParam(PARAM_FLOAT)) {
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inputMessage = request->getParam(PARAM_FLOAT)->value();
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writeFile(SPIFFS, "/inputFloat.txt", inputMessage.c_str());
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}
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else {
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inputMessage = "No message sent";
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}
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Serial.println(inputMessage);
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request->send(200, "text/text", inputMessage);
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});
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server.onNotFound(notFound);
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server.begin();
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}
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void loop() {
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// To access your stored values on inputString, inputInt, inputFloat
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String yourInputString = readFile(SPIFFS, "/inputString.txt");
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Serial.print("*** Your inputString: ");
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Serial.println(yourInputString);
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int yourInputInt = readFile(SPIFFS, "/inputInt.txt").toInt();
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Serial.print("*** Your inputInt: ");
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Serial.println(yourInputInt);
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float yourInputFloat = readFile(SPIFFS, "/inputFloat.txt").toFloat();
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Serial.print("*** Your inputFloat: ");
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Serial.println(yourInputFloat);
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delay(5000);
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}
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