I have an ESP32 devkit set up to monitor my wifi connection.
Here is my main code
/*
* ESP32 - get wifi credentials from serial monitor
* using wifi events
* code from wifimanager
* https://docs.espressif.com/projects/arduino-esp32/en/latest/tutorials/preferences.html
* https://randomnerdtutorials.com/esp32-save-data-permanently-preferences/
* problems with save creds, retrieve creds, serGetCreds - string, pointer or array of char.
*/
// #include "webstats.h" // declarations of variables to calculate statistics and handle time
#include <WiFi.h> //WiFi functions - supports wifi.ino
#include <time.h> //support for time functions
#include <Preferences.h> // for functions relating to flash memory
Preferences myprefs; //create an instance of the library, called myprefs
#define BAUDRATE 115200
//lights and switches : shown here so we can see what lights are being turned on/off
int trigger = 4; //button to GND; press to clear the existing connection and allow reconfiguration
int yLed = 18; //yellow led + 1k to GND
int bLed = 19 ; //blue LED + 1k to GND (presently green)
int rLed = 21; //red LED + 1k to GND
//hardware management
boolean triggerState = 0; //moitor to check for a change
boolean triggerEvent = 0; // 1 shows a trigger event has occurred
//for preferences storage
#define RW_MODE false
#define RO_MODE true
String ssid = ""; //hidden for forum
String pass = "";
/* Configuration of NTP */
#define MY_NTP_SERVER "pool.ntp.org"
#define MY_TZ "GMT0" //not working - not used
time_t now; // this is the epoch
tm tm;
// *** loop timing ***
unsigned long timeWas, timeNow;
unsigned long interval = 60000; //
//const IPAddress remote_ip(192, 168, 1, 1); //ping the router
//const IPAddress remote_ip(192, 168, 1, 22); //to ping network printer
//const IPAddress remote_ip(185, 217, 104, 171); //to ping TheHUT: doesnt work if in header file
const IPAddress remote_ip(9, 9, 9, 9); //to ping Quad9
// function prototypes wifi.ino
void WiFiStationConnected(WiFiEvent_t event, WiFiEventInfo_t info);
void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info);
void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info);
String waitForSerialInput(String prompt); //prompt and read a string from serial io
void serGetCreds(); //input new credentials from serial io
void getCreds(); //get saved credentials from myprefs
void saveCreds(String ssid, String pass); //save credentials to myprefs
void printLocalTime();
// function prototypes hardio.ino
void initIO(); //initialise hardware IO devices all leds off
void flashAll(int count); //flash all LEDs count times
void setup() {
Serial.begin(BAUDRATE);
Serial.println();
delay(10000); //allow to clear serial moonitor
initIO(); //initialise hardware IO devices all leds off
Serial.println("Serial comms established");
//create a new storage space on the flash memory with the credentials namespace. false=read-write (true = read only)
myprefs.begin("credentials", RW_MODE);
getCreds();
Serial.print("Retrieved values: SSID: ");
Serial.print(ssid);
Serial.print(" and PASS: ");
Serial.println(pass);
// delete old config
// WiFi.disconnect(true);
WiFi.onEvent(WiFiStationConnected, WiFiEvent_t::ARDUINO_EVENT_WIFI_STA_CONNECTED);
WiFi.onEvent(WiFiGotIP, WiFiEvent_t::ARDUINO_EVENT_WIFI_STA_GOT_IP);
WiFi.onEvent(WiFiStationDisconnected, WiFiEvent_t::ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
//connectWiFi();
WiFi.begin(ssid, pass);
configTime(0, 0, MY_NTP_SERVER); // --> Here is the IMPORTANT ONE LINER needed in your sketch!
flashAll(10); //shows all LEDs are connected and working
timeWas = millis();
}
void loop() {
digitalWrite(yLed, HIGH);
timeNow = millis();
if(timeNow - timeWas > interval){
Serial.print("loop: ");
printLocalTime();
timeWas = timeNow; //reset timer
}
if (!digitalRead(trigger) != triggerState ){ //they are different so button has been pressed
//triggerEvent = 1;
triggerState = 1;
//clear ssid and password and save them
ssid = " ";
pass = " ";
saveCreds(ssid, pass);
// delete old config
WiFi.disconnect(true);
digitalWrite(rLed, HIGH);
delay(1000);
digitalWrite(rLed, LOW);
triggerState = 0; //ready for another trigger:: should this go elsewhere?
}
}
and the wifi events - in a tab wifi.ino
void WiFiStationConnected(WiFiEvent_t event, WiFiEventInfo_t info) {
Serial.println("WiFiStationConnected - Connected to AP successfully!");
digitalWrite(bLed, HIGH);
} //show blue led while wifi is on
void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info) {
Serial.println("WiFiGotIP - WiFi connected");
Serial.print("IP number is ");
Serial.print(WiFi.localIP());
Serial.print(" MAC address is ");
Serial.println(WiFi.macAddress());
Serial.print("WiFi connection signal Strength (RRSI): ");
Serial.println(WiFi.RSSI());
digitalWrite(bLed, HIGH);
}
void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
Serial.println("WiFiStationDisconnected - Disconnected from WiFi access point");
Serial.print("WiFi lost connection. Reason: ");
Serial.println(info.wifi_sta_disconnected.reason);
digitalWrite(bLed, LOW);
Serial.println("Trying to Reconnect");
WiFi.begin(ssid, pass);
}
the serial monitor shows the wifi events are beng called - but the LEDs dont respond properly
eg when the wifi is connected I'd expect the blue LED to be lit - and its not.