#include "Secrets.h"
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "WiFi.h"
#include "DHT.h"
#define DHTPIN 15 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 11
#define AWS_IOT_PUBLISH_TOPIC "TempHum/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "TempHum/sub"
float h ;
float t;
String device_id ="device_id";
DHT dht(DHTPIN, DHTTYPE);
WiFiClientSecure net = WiFiClientSecure();
PubSubClient client(net);
void connectAWS()
{
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.println("Connecting to Wi-Fi");
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
// Configure WiFiClientSecure to use the AWS IoT device credentials
net.setCACert(AWS_CERT_CA);
net.setCertificate(AWS_CERT_CRT);
net.setPrivateKey(AWS_CERT_PRIVATE);
// Connect to the MQTT broker on the AWS endpoint we defined earlier
client.setServer(AWS_IOT_ENDPOINT, 8883);
// Create a message handler
client.setCallback(messageHandler);
Serial.println("Connecting to AWS IOT");
while (!client.connect(THINGNAME))
{
Serial.print(".");
delay(100);
}
if (!client.connected())
{
Serial.println("AWS IoT Timeout!");
return;
}
// Subscribe to a topic
client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
Serial.println("AWS IoT Connected!");
}
void publishMessage()
{
StaticJsonDocument<200> doc;
doc["humidity"] = h;
doc["temperature"] = t;
doc["device_id"]=device_id;
char jsonBuffer[512];
serializeJson(doc, jsonBuffer); // print to client
client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}
void messageHandler(char* topic, byte* payload, unsigned int length)
{
Serial.print("incoming: ");
Serial.println(topic);
StaticJsonDocument<200> doc;
deserializeJson(doc, payload);
const char* message = doc["message"];
Serial.println(message);
}
void setup()
{
randomSeed(analogRead(0));
Serial.begin(115200);
connectAWS();
dht.begin();
}
void loop()
{
int rndNb = random(1, 5);
String str = "Device_" + String(rndNb);
h = dht.readHumidity();
t = dht.readTemperature();
device_id = str;
if (isnan(h) || isnan(t) ) // Check if any reads failed and exit early (to try again).
{
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
Serial.print(F("Device ID: "));
Serial.print(device_id);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.println(F("°C "));
publishMessage();
client.loop();
delay(3000);
}