first commit

.gitignore

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

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 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:esp01_1m]
+platform = espressif8266
+board = esp01_1m
+framework = arduino
+monitor_speed = 115200    

readme.md

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+## shrimp-embankment-esp-01
+
+#### the esp-01 receive data from arduino uno and send it to node js server
+
+![alt text](image.png)

src/main.cpp

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+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+
+// WiFi credentials
+const char *ssid = "KARAN";
+const char *password = "12345679";
+
+
+WiFiClient client;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("ESP-01 ready");
+
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    delay(500);
+    Serial.println("Connecting to WiFi..");
+  }
+  Serial.println("Connected to the WiFi network");
+  Serial.println(WiFi.localIP());
+
+  Serial.println("Starting up...");
+
+  delay(2000);
+}
+
+void loop()
+{
+  if (WiFi.status() == WL_CONNECTED)
+  {
+    String IncomingStr = "";
+
+    while (Serial.available() > 0)
+    {
+      char in = Serial.read();
+      IncomingStr += in;
+      delay(2);
+    }
+
+    if (IncomingStr.length() > 0)
+    {
+
+      IncomingStr = IncomingStr.substring(0, IncomingStr.indexOf('\n'));
+
+      String jsonSent = "{\"value\": \"" + IncomingStr + "\"}";
+
+      // Initialize HTTP client
+      HTTPClient http;
+      http.begin(client, "http://192.168.20.45:3006");
+
+      http.addHeader("Content-Type", "application/json");
+      int httpResponseCode = http.POST(jsonSent);
+
+      if (httpResponseCode > 0)
+      {
+        Serial.print("HTTP Response code: ");
+        Serial.println(httpResponseCode);
+        String payload = http.getString();
+        Serial.println(payload);
+      }
+      else
+      {
+        Serial.print("Error code: ");
+        Serial.println(httpResponseCode);
+      }
+
+      // Close connection
+      http.end();
+      delay(1000);
+    }
+
+    // Send data to Arduino
+    Serial.println("Hello from ESP-01!");
+  }
+  else
+  {
+    // Reconnect to WiFi if disconnected
+    WiFi.begin(ssid, password);
+
+    // Wait for connection
+    int timeout = 0;
+    while (WiFi.status() != WL_CONNECTED && timeout < 20)
+    { // wait for 10 seconds max
+      delay(500);
+      Serial.print(".");
+      timeout++;
+    }
+
+    if (WiFi.status() == WL_CONNECTED)
+    {
+      Serial.println("");
+      Serial.println("Reconnected to WiFi");
+      Serial.println("IP address: ");
+      Serial.println(WiFi.localIP());
+    }
+    else
+    {
+      Serial.println("");
+      Serial.println("Failed to reconnect to WiFi");
+    }
+  }
+  delay(2000);
+}

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