Sending and receiving data with ESP32 from AdafruitIO cloud service

If you need to send and recieve data with your ESP32, but cannot (or do not want to) use a USB serial connection you can upload and fetch data from a cloud service, like Adafruit IO

Config.h file:


// You will find these on https://io.adafruit.com/
#define IO_USERNAME  "YOUR_ADAFRUIT_IO_USERNAME"
#define IO_KEY       "YOUR_ADAFRUIT_IO_PASSKEY"

//These will be your WiFi name and password
//Don't forget to change them if you move to another network
#define WIFI_SSID "WiFi_NETWORK_NAME"
#define WIFI_PASS "WiFi_NETWORK_PASSWORD"

#include "AdafruitIO_WiFi.h"

AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);

ArduinoIDE code:


#include "config.h"
#define POTENTIOMETER A2

//access my feed
AdafruitIO_Feed *myfeed = io.feed("my_feed");
//access other person's feed
AdafruitIO_Feed *otherfeed = io.feed("other_feed", "otherPersonsUsername");

bool other_value = false;

void setup() {
    // put your setup code here, to run once:
    Serial.begin(115200);
    while(! Serial);

    Serial.print("Trying to connect to Adafruit IO:");
    io.connect();

    while(io.status() < AIO_CONNECTED) {
    Serial.print(".");
    delay(500);
    }
    Serial.println();
    Serial.println(io.statusText());

    otherfeed->onMessage(handleMessage);
}

void loop() {
    // put your main code here, to run repeatedly:
    io.run();

    float value = analogRead(POTENTIOMETER);

    Serial.print("Sending this: ");
    Serial.println(value);
    myfeed->save(value);
    
    if(other_value){
    digitalWrite(13, HIGH);
    }
    else {
    digitalWrite(13, LOW);
    }
    delay(3000);
}

void handleMessage(AdafruitIO_Data *data){
    Serial.print("Received: ");
    Serial.println(data->value()); // data as text

    if(data->toInt() > 2000){ // data as number
    other_value = true;
    }
    else {
    other_value = false;
    }
}