Initial Commit. It is working

src/main.cpp

@@ -0,0 +1,180 @@
+#include <ESP8266WiFi.h>
+#include <ESP8266WiFiMulti.h>   // Include the Wi-Fi-Multi library
+#include <DHT.h>
+#include <Wire.h>
+#include <WiFiClientSecure.h>
+
+// ESP8266WiFiMulti wifiMulti;     // Create an instance of the ESP8266WiFiMulti class, called 'wifiMulti'
+
+// WiFi connect timeout per AP. Increase when connecting takes longer.
+// const uint32_t connectTimeoutMs = 5000;
+
+// Replace with your network credentials
+const char* ssid = "Tanshu";
+const char* password = "openwrt15";
+
+// Replace with your server's address
+const char* serverAddress = "sensors.tanshu.com";
+const int serverPort = 443;
+
+// Replace with your DHT sensor pin
+const int dhtPin = D4;
+
+// Replace with your device name
+const char* deviceName = "s1-orb";
+
+// Initialize the DHT sensor
+DHT dht(dhtPin, DHT22);
+
+// Function declaration
+void connectToWiFi();
+void sendSensorData(float temperature, float humidity, unsigned long timestamp, const char* device);
+void sendBufferedData();
+
+// Data buffer
+struct SensorData {
+  float temperature;
+  float humidity;
+  unsigned long timestamp;
+};
+
+const int BUFFER_SIZE = 10;
+SensorData buffer[BUFFER_SIZE];
+int bufferIndex = 0;
+
+unsigned long previousTimestamp = 0;
+const unsigned long interval = 30000;
+
+void setup() {
+  Serial.begin(9600);
+  // Serial.setDebugOutput(true);
+  connectToWiFi();
+  
+  dht.begin();
+}
+
+void loop() {
+  unsigned long currentTimestamp = millis();
+
+  if (currentTimestamp - previousTimestamp >= interval) {
+    float temperature = dht.readTemperature();
+    float humidity = dht.readHumidity();
+
+    if (isnan(temperature) || isnan(humidity)) {
+      Serial.println("Failed to read from DHT sensor!");
+      return;
+    }
+
+    Serial.print("Temperature: ");
+    Serial.print(temperature);
+    Serial.print(" °C\tHumidity: ");
+    Serial.print(humidity);
+    Serial.println(" %");
+
+    // Buffer the data
+    buffer[bufferIndex].temperature = temperature;
+    buffer[bufferIndex].humidity = humidity;
+    buffer[bufferIndex].timestamp = currentTimestamp;
+
+    // Increment the buffer index
+    bufferIndex = (bufferIndex + 1) % BUFFER_SIZE;
+
+    // Attempt to send buffered data when connectivity is restored
+    sendBufferedData();
+
+    previousTimestamp = currentTimestamp;
+  }
+}
+
+void connectToWiFi() {
+  delay(2000);
+  Serial.println("Starting WiFi Connection");
+
+  // Set in station mode
+  // WiFi.mode(WIFI_STA);
+  
+  // Register multi WiFi networks
+  // wifiMulti.addAP("Tanshu", "openwrt15");
+  WiFi.setPhyMode(WIFI_PHY_MODE_11G);
+  WiFi.begin(ssid, password);
+
+  // while (wifiMulti.run() != WL_CONNECTED) {
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  
+  Serial.println("");
+  Serial.print("Connected to ");
+  Serial.println(WiFi.SSID());              // Tell us what network we're connected to
+  Serial.println("IP address: " + WiFi.localIP().toString());
+}
+
+void sendSensorData(float temperature, float humidity, unsigned long age, const char* device) {
+  String url = "/upload";
+  
+  WiFiClientSecure client;
+  client.setInsecure();//skip verification
+
+  if (!client.connect(serverAddress, serverPort)) {
+    Serial.println("Failed to connect to server!");
+    return;
+  }
+  
+  // if (client.verifyCertChain(serverAddress)) {
+  //   Serial.println("Certificate matches!");
+  // } else {
+  //   Serial.println("Certificate doesn't match!");
+  // }
+
+  // Calculate the length of the payload
+  String payload = "temp=" + String(temperature) + "&humidity=" + String(humidity) + "&age=" + String(millis() - age) + "&device=" + device;
+  int payloadLength = payload.length();
+
+  Serial.println("POST " + url + " HTTP/1.1\r\n" +
+               "Host: " + String(serverAddress) + "\r\n" +
+               "Connection: close\r\n" +
+               "Content-Type: application/x-www-form-urlencoded\r\n" +
+               "Content-Length: " + String(payloadLength) + "\r\n\r\n" +
+              payload);
+
+  client.print("POST " + url + " HTTP/1.1\r\n" +
+               "Host: " + String(serverAddress) + "\r\n" +
+               "Connection: close\r\n" +
+               "Content-Type: application/x-www-form-urlencoded\r\n" +
+               "Content-Length: " + String(payloadLength) + "\r\n\r\n" +
+               payload);
+
+  while (client.connected()) {
+    if (client.available()) {
+      String line = client.readStringUntil('\n');
+      Serial.println(line);
+    }
+  }
+
+  Serial.println("Sent sensor data to server!");
+
+  client.stop();
+}
+
+void sendBufferedData() {
+  if (WiFi.status() == WL_CONNECTED) {
+    // Send buffered data if connectivity is restored
+    for (int dataIndex = bufferIndex - 1; dataIndex >= 0; dataIndex--) {
+      // Extract temperature, humidity, and timestamp from the buffer
+      float temperature = buffer[dataIndex].temperature;
+      float humidity = buffer[dataIndex].humidity;
+      unsigned long age = buffer[dataIndex].timestamp;
+
+      // Attempt to send the data
+      // Serial.println("temp: " + String(temperature) + " // humidity: " + String(humidity) + " // age: " + String(millis() - age) + " // device: " + deviceName);
+      sendSensorData(temperature, humidity, age, deviceName);
+
+      // Wait a short time before sending the next data
+      delay(100);
+    }
+
+    // Clear the buffer
+    bufferIndex = 0;
+  }
+}