first

.gitmodules

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+[submodule "tgbot-cpp"]
+	path = tgbot-cpp
+	url = https://github.com/reo7sp/tgbot-cpp/

CMakeLists.txt

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+include(FetchContent)
+
+FetchContent_Declare(json
+  GIT_REPOSITORY https://github.com/nlohmann/json.git
+  GIT_TAG v3.7.3)
+
+FetchContent_GetProperties(json)
+if(NOT json_POPULATED)
+  FetchContent_Populate(json)
+  add_subdirectory(${json_SOURCE_DIR} ${json_BINARY_DIR} EXCLUDE_FROM_ALL)
+endif()
+
+cmake_minimum_required(VERSION 2.8.4)
+project(echobot-submodule)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall")
+set(Boost_USE_MULTITHREADED ON)
+
+find_package(Threads REQUIRED)
+find_package(OpenSSL REQUIRED)
+find_package(Boost COMPONENTS system REQUIRED)
+include_directories(/usr/local/include ${OPENSSL_INCLUDE_DIR} ${Boost_INCLUDE_DIR})
+
+add_subdirectory(tgbot-cpp)
+
+add_executable(telegram_bog telegram_bot.cpp)
+
+target_link_libraries(telegram_bog PRIVATE TgBot ${CMAKE_THREAD_LIBS_INIT}
+    ${OPENSSL_LIBRARIES} ${Boost_LIBRARIES} ${CURL_LIBRARIES}
+    nlohmann_json::nlohmann_json)
+

telegram_bot.cpp

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+#include <csignal>
+#include <cstdio>
+#include <cstdlib>
+#include <exception>
+#include <string>
+#include <nlohmann/json.hpp>
+
+#include <tgbot/tgbot.h>
+
+using namespace TgBot;
+using json = nlohmann::json;
+
+namespace kare {
+
+class db {
+
+    std::string filepath;
+
+    public:
+    db () {
+
+    }
+
+};
+
+
+};
+
+
+
+int main() {
+    char *tok = getenv("TOKEN");
+    
+    if (!tok) {
+        std::cout << "Need to set environment variable TOKEN" << std::endl;
+        exit(1);
+    }
+
+    std::string token {tok};
+
+    printf("Token: %s\n", token.c_str());
+
+    Bot bot(token);
+    bot.getEvents().onCommand("start", [&bot](Message::Ptr message) {
+        bot.getApi().sendMessage(message->chat->id, "Hi!");
+    });
+    bot.getEvents().onAnyMessage([&bot](Message::Ptr message) {
+        printf("User wrote %s\n", message->text.c_str());
+        if (StringTools::startsWith(message->text, "/start")) {
+            return;
+        }
+        bot.getApi().sendMessage(message->chat->id, "Your message is: " + message->text);
+    });
+
+    signal(SIGINT, [](int s) {
+        printf("SIGINT got\n");
+        exit(0);
+    });
+
+    try {
+        printf("Bot username: %s\n", bot.getApi().getMe()->username.c_str());
+        bot.getApi().deleteWebhook();
+
+        TgLongPoll longPoll(bot);
+        while (true) {
+            printf("Long poll started\n");
+            longPoll.start();
+        }
+    } catch (std::exception& e) {
+        printf("error: %s\n", e.what());
+    }
+
+    return 0;
+}
+

tgbot-cpp

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+Subproject commit 9dae1b4ae78218a7ebd341f8b2952fe26affdf74