Initial Commit. It is working

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:d1_mini]
+platform = espressif8266
+board = d1_mini
+framework = arduino
+lib_deps = 
+	adafruit/DHT sensor library@^1.4.4
+	adafruit/Adafruit Unified Sensor@^1.1.9

src/main.cpp

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+#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;
+  }
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html