basic functionality

include/Globals.h

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+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+// Cluster protocol and API constants
+namespace ClusterProtocol {
+    constexpr const char* DISCOVERY_MSG = "CLUSTER_DISCOVERY";
+    constexpr const char* RESPONSE_MSG = "CLUSTER_RESPONSE";
+    constexpr uint16_t UDP_PORT = 4210;
+    constexpr size_t UDP_BUF_SIZE = 64;
+    constexpr const char* API_NODE_STATUS = "/api/node/status";
+}
+
+namespace TaskIntervals {
+    constexpr unsigned long SEND_DISCOVERY = 1000;
+    constexpr unsigned long LISTEN_FOR_DISCOVERY = 100;
+    constexpr unsigned long UPDATE_STATUS = 1000;
+    constexpr unsigned long PRINT_MEMBER_LIST = 5000;
+    constexpr unsigned long HEARTBEAT = 2000;
+    constexpr unsigned long UPDATE_ALL_MEMBERS_INFO = 10000;
+}
+
+constexpr unsigned long NODE_ACTIVE_THRESHOLD = 10000;
+constexpr unsigned long NODE_INACTIVE_THRESHOLD = 60000;
+constexpr unsigned long NODE_DEAD_THRESHOLD = 120000;
+    

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 convention is to give header files names that end with `.h'.
+
+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