WIFI, https, post JSON, DHT11

client.ino

#include <DHT.h>
#include <WiFiClientSecure.h>
#include <ArduinoJson.h>

// DHT22 sensor configuration
#define DHT_PIN 4
#define DHT_TYPE DHT11

DHT dht(DHT_PIN, DHT_TYPE);

// Wi-Fi credentials
const char* ssid = "SSID";
const char* password = "XXXXXXXXX";

// Server configuration
const char* host = "mywebsite.com";
const int httpsPort = 443;

unsigned long lastRequestTime = 0;
const unsigned long requestInterval = 5000; // Interval between requests in milliseconds

// Add these variables to hold client_id and client_secret
const char* clientID = "client_id";
const char* clientSecret = "secret";
String bearerToken;

void setup() {
  Serial.begin(115200);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Print the IP address
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Initialize the DHT sensor
  dht.begin();
  Serial.println("DHT started");

  // Get the bearer token
  bearerToken = getBearerToken();
}

void loop() {
  // Check if it's time to make the HTTP request
  unsigned long currentTime = millis();
  if (currentTime - lastRequestTime >= requestInterval) {
    lastRequestTime = currentTime;
    makeHttpPostRequest();
  }

  // Other code in the loop
  // ...
}

void setInterval(unsigned long interval, void (*callback)()) {
  static unsigned long lastExecution = 0;
  if (millis() - lastExecution >= interval) {
    lastExecution = millis();
    (*callback)();
  }
}

String getBearerToken() {
  Serial.println("getBearerToken called");
  // Create a WiFiClientSecure object
  WiFiClientSecure client;

  // Set the CA certificate (optional)
  // Uncomment the line below if you have a custom CA certificate
  // client.setCACert(/* Your CA certificate */);
  client.setInsecure();

  // Connect to the server
  if (!client.connect(host, httpsPort)) {
    Serial.println("Connection failed");
    return "";
  }

  // Create the request payload
  String payload = "client_id=" + String(clientID) + "&client_secret=" + String(clientSecret) + "&grant_type=client_credentials";

  // Send the HTTP POST request
  client.println("POST /oauth/token HTTP/1.1");
  client.println("Host: mywebsite.com");
  client.println("Content-Type: application/x-www-form-urlencoded");
  client.print("Content-Length: ");
  client.println(payload.length());
  client.println();
  client.println(payload);

  // Read the response from the server
  String response;
  bool inBody = false;
  size_t contentLength = 0;

  while (client.connected()) {
    String line = client.readStringUntil('\n');

    if (!inBody && line == "\r") {
      inBody = true;
    } else if (inBody) {
      if (contentLength == 0) {
        // Parse chunk size
        contentLength = strtol(line.c_str(), NULL, 16);
      } else {
        // Append chunk to response
        response += line;
        contentLength -= line.length();
      }

      if (contentLength == 0) {
        // End of chunk
        break;
      }
    }
  }

  // Print the response
  Serial.println("Server Response:");
  Serial.println(response);

  // Disconnect from the server
  client.stop();

  // Extract the bearer token from the response
  int tokenStartIndex = response.indexOf("\"access_token\":\"") + 16;
  int tokenEndIndex = response.indexOf("\"", tokenStartIndex);
  if (tokenStartIndex == -1 || tokenEndIndex == -1) {
    Serial.println("Bearer token not found in response");
    return "";
  }
  String token = response.substring(tokenStartIndex, tokenEndIndex);

  return token;
}

void makeHttpPostRequest() {
  Serial.println("makeHttpPostRequest called");
  // Create a WiFiClientSecure object
  WiFiClientSecure client;

  // Set the CA certificate (optional)
  // Uncomment the line below if you have a custom CA certificate
  // client.setCACert(/* Your CA certificate */);
  client.setInsecure();

  // Connect to the server
  if (!client.connect(host, httpsPort)) {
    Serial.println("Connection failed");
    return;
  }

  // Read the temperature from the DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Create the JSON payload
  DynamicJsonDocument payloadJson(256);
  JsonObject payloadObj = payloadJson.to<JsonObject>();
  payloadObj["temperature"] = temperature;
  payloadObj["humidity"] = humidity;

  // Serialize the JSON object to a string
  String payload;
  serializeJson(payloadObj, payload);

  // Create the payload array
  DynamicJsonDocument requestJson(256);
  JsonObject requestObj = requestJson.to<JsonObject>();
  requestObj["payload"] = payload;

  // Serialize the request array to a string
  String requestPayload;
  serializeJson(requestObj, requestPayload);

 // array (
 // 'payload' => '{"temperature":-9.040000000000006,"humidity":"26.7"}',
 // )


  // Send the HTTPS POST request with the Bearer token
  client.println("POST /api/store HTTP/1.1");
  client.println("Host: website.com");
  client.println("Connection: close");
  client.println("Content-Type: application/json");
  client.print("Content-Length: ");
  client.println(requestPayload.length());
  client.println("Authorization: Bearer " + bearerToken);
  client.println();
  client.println(requestPayload);

  // Read the response from the server
  Serial.println("Response from server:");
  while (client.connected()) {
//    String line = client.readStringUntil('\n');
//    Serial.println(line);
  }

  // Disconnect from the server
  client.stop();
}