Make the agent.

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:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+lib_deps = 
+	arduino-libraries/ArduinoMqttClient@^0.1.5
+	arduino-libraries/NTPClient@^3.2.1
+	bblanchon/ArduinoJson@^6.19.4

src/main.cpp

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+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <WiFiClient.h>
+#include <ArduinoMqttClient.h>
+#include <NTPClient.h>
+#include <WiFiUdp.h>
+#include <ArduinoJson.h>
+#include "arduino_secrets.h"
+
+#define LDR_PIN A0
+int LEDS_PIN[] = {D1, D2, D3, D4};
+
+///////please enter your sensitive data in the Secret tab/arduino_secrets.h
+char ssid[] = SECRET_SSID; // your network SSID (name)
+char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
+
+WiFiClient wifiClient;
+MqttClient mqttClient(wifiClient);
+
+WiFiUDP ntpUDP;
+NTPClient timeClient(ntpUDP, "pool.ntp.org");
+
+const char broker[] = BROKER_IP; // broker IP !!!!!!!!!!!!!!!!!!!!!!!!!!*******
+int port = 1883;
+const char ping_topic[] = "I1820/main/agent/ping";
+const char log_topic[] = "I1820/main/log/send";
+const char notif_topic[] = "I1820/main/configuration/request";
+
+// set interval for sending messages (milliseconds)
+const long interval = 5000;
+unsigned long previousMillis = 0;
+
+StaticJsonDocument<200> doc;
+
+void onMqttMessage(int messageSize)
+{
+  // we received a message, print out the topic and contents
+  Serial.println("Received a message with topic '");
+  Serial.print(mqttClient.messageTopic());
+  Serial.print("', length ");
+  Serial.print(messageSize);
+  Serial.println(" bytes:");
+
+  String json = "";
+
+  // use the Stream interface to print the contents
+  while (mqttClient.available())
+    json += (char)mqttClient.read();
+
+  Serial.println(json);
+  deserializeJson(doc, json);
+
+  if ((doc["agent"] == "nodemcu") && (doc["settings"][0]["name"] == "on"))
+  {
+    if (doc["device"] == "l1")
+      digitalWrite(LEDS_PIN[0], doc["settings"][0]["value"]);
+    else if (doc["device"] == "l2")
+      digitalWrite(LEDS_PIN[1], doc["settings"][0]["value"]);
+    else if (doc["device"] == "l3")
+      digitalWrite(LEDS_PIN[2], doc["settings"][0]["value"]);
+    else if (doc["device"] == "l4")
+      digitalWrite(LEDS_PIN[3], doc["settings"][0]["value"]);
+  }
+
+  Serial.println();
+}
+
+void setup()
+{
+  // Initialize serial and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial)
+    ; // wait for serial port to connect. Needed for native USB port only
+
+  // attempt to connect to Wifi network:
+  Serial.print("Attempting to connect to WPA SSID: ");
+  Serial.print(ssid);
+  while (WiFi.begin(ssid, pass) != WL_CONNECTED)
+  {
+    // failed, retry
+    Serial.print(".");
+    delay(5000);
+  }
+  Serial.println();
+
+  Serial.println("You're connected to the network");
+  Serial.println();
+
+  Serial.print("Attempting to connect to the MQTT broker: ");
+  Serial.println(broker);
+
+  if (!mqttClient.connect(broker, port))
+  {
+    Serial.print("MQTT connection failed! Error code = ");
+    Serial.println(mqttClient.connectError());
+
+    while (1)
+      ;
+  }
+
+  Serial.println("You're connected to the MQTT broker!");
+  Serial.println();
+
+  mqttClient.onMessage(onMqttMessage);
+
+  mqttClient.subscribe(notif_topic);
+
+  for (unsigned int i = 0; i < sizeof(LEDS_PIN) / sizeof(LEDS_PIN[0]); i++)
+    pinMode(LEDS_PIN[i], OUTPUT);
+
+  timeClient.begin();
+  timeClient.setTimeOffset(0);
+}
+
+void loop()
+{
+  // call poll() regularly to allow the library to send MQTT keep alive which
+  // avoids being disconnected by the broker
+  mqttClient.poll();
+
+  unsigned long currentMillis = millis();
+
+  if (currentMillis - previousMillis >= interval)
+  {
+    timeClient.update();
+    // save the last time a message was sent
+    previousMillis = currentMillis;
+
+    // **************** ping
+    String ping = "{\"id\": \"nodemcu\",\"things\": [{ \"id\": \"ldr\", \"type\": \"light\" }, { \"id\": \"l1\", \"type\": \"lamp\" }, { \"id\": \"l2\", \"type\": \"lamp\" }, { \"id\": \"l3\", \"type\": \"lamp\" }, { \"id\": \"l4\", \"type\": \"lamp\" }],\"actions\": []}";
+
+    Serial.print("Sending message to topic: ");
+    Serial.println(ping_topic);
+    Serial.println(ping);
+
+    mqttClient.beginMessage(ping_topic);
+    mqttClient.print(ping);
+    mqttClient.endMessage();
+
+    // **************** ldr
+    int ldr_value = analogRead(LDR_PIN);
+    String ldr_message = "{\"timestamp\": " + String(timeClient.getEpochTime()) + ", \"type\": \"light\", \"device\": \"ldr\", \"states\": [{ \"name\": \"light\", \"value\": " + String(map(ldr_value, 0, 1024, 100, 0)) + " }], \"agent\": \"nodemcu\"}";
+
+    Serial.print("Sending message to topic: ");
+    Serial.println(log_topic);
+    Serial.println(ldr_message);
+
+    mqttClient.beginMessage(log_topic);
+    mqttClient.print(ldr_message);
+    mqttClient.endMessage();
+
+    Serial.println();
+  }
+}

test/README

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+
+This directory is intended for PlatformIO Unit Testing 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/page/plus/unit-testing.html