24.02.2017ESP8266 - Uložení nastavení WIFI

Demo využití filesystému

Demo programu který uloží nastavení wifi do souboru na filesystému a pak ho použije k připojení na síť.

Demo program

// use command: <SSID;PASSWORD>

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include "FS.h"

const char* ssid = "defaultssid";
const char* password = "defaultpwd";
const char* authFile = "/wifi.auth";

ESP8266WebServer server(80);

const int led = 13;

void handleRoot() {
  digitalWrite(led, 1);
  server.send(200, "text/plain", "hello from esp8266!");
  digitalWrite(led, 0);
}

void handleNotFound(){
  digitalWrite(led, 1);
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i=0; i<server.args(); i++){
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
  digitalWrite(led, 0);
}

bool readSSID = false;
bool readPwd = false;
bool readDone = false;
String rSSID = "";
String rPWD = "";

void readAuthFromSerial(){
  if (Serial.available() >0) {
    while(Serial.available() >0) {
      char c = Serial.read();  //gets one byte from serial buffer
      if(c == '<'){ readSSID = true; }
      else if(c == ';'){ readPwd = true; }
      else if(c == '>'){ readSSID = false; readDone = true; }
      else if(readPwd){ rPWD += c; }
      else if(readSSID){ rSSID += c; }
    }

    if(readDone){
      Serial.println();
      Serial.println("Received from serial:");
      Serial.println("---------------------");
      Serial.print("SSID:");
      Serial.println(rSSID);
      Serial.print("Password:");
      Serial.println(rPWD);
      Serial.println("- Save to file");
      saveAuth(rSSID, rPWD);
      Serial.println("Read from file:");
      Serial.println("---------------------");
      checkAuth();
      Serial.println("---------------------");
      Serial.println("Reboot your device");
  
      readDone = false;
      readSSID = false;
      readPwd = false;
      rSSID = "";
      rPWD = "";
    }
  }
}

void saveAuth(String ssid, String password) {
  File f = SPIFFS.open(authFile, "w");
  if (!f) {
    Serial.println("file creation failed");
    return;
  }
  
  f.print(ssid);
  f.print(";");
  f.print(password);
  f.print(";");

  f.close();
}

void checkAuth() {
  File f = SPIFFS.open(authFile, "r");
  if (!f) {
    Serial.println("File not found. Set auth usingo command <SSID;PASSWORD>");
    return;
  }
  
  Serial.print("SSID: "); Serial.println(getAuthSSID());
  Serial.print("Password: "); Serial.println(getAuthPassword());

  f.close();
}

String getAuthSSID() {
  File f = SPIFFS.open(authFile, "r");
  if (!f) {
    Serial.println("File not found. Set auth usingo command <SSID;PASSWORD>");
    return "";
  }

  int i = 0;
  while(f.available()) {
    String line = f.readStringUntil(';');
    if(i == 0) { 
      f.close();
      return line;
    }
    i++;
  }

  f.close();
  return "";
}

String getAuthPassword() {
  File f = SPIFFS.open(authFile, "r");
  if (!f) {
    Serial.println("File not found. Set auth usingo command <SSID;PASSWORD>");
    return "";
  }

  int i = 0;
  while(f.available()) {
    String line = f.readStringUntil(';');
    if(i == 1) { 
      f.close();
      return line;
    }
    i++;
  }

  f.close();
  return "";
}

void setup(void){
  const char* _ssid = "";
  const char* _password = "";
  
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  bool result = SPIFFS.begin(); // always use this to "mount" the filesystem
  Serial.begin(115200);
  
  _ssid = strdup(getAuthSSID().c_str());
  _password = strdup(getAuthPassword().c_str());

  Serial.println();
  Serial.println();
  Serial.println("Connect to:");
  Serial.print("SSID: ");
  Serial.println(_ssid);
  Serial.print("PWD: ");
  Serial.println(_password);
  Serial.println();
  
  WiFi.begin(_ssid, _password);
  Serial.println("");

  // Wait for connection
  int counter = 0;
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    readAuthFromSerial();
    counter++;
    if(counter > 40){
      Serial.println();
      counter = 0;
    }
  }

    
  
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(_ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (MDNS.begin("esp8266")) {
    Serial.println("MDNS responder started");
  }

  server.on("/", handleRoot);

  server.on("/inline", [](){
    server.send(200, "text/plain", "this works as well");
  });

  server.onNotFound(handleNotFound);

  server.begin();
  Serial.println("HTTP server started");
}

void loop(void){
  readAuthFromSerial();
  server.handleClient();
}