add test/

+cmake_minimum_required(VERSION 3.0)
+project(zmqrpc)
+find_package(Git REQUIRED)
+if(CMAKE_TOOLCHAIN_FILE) 
+set(TOOLCHAIN "-DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}")
+else()
+set(TOOLCHAIN "")
+endif()
+
+
+project(zmqrpc)
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.2)
+        message(FATAL_ERROR "GCC version must be at least 7.2!")
+    endif()
+endif()
+
+add_compile_options(-std=c++17)
+add_compile_options(-O4)
+
+include(ExternalProject)
+
+ExternalProject_Add (
+      cppzmq		    
+      GIT_REPOSITORY https://github.com/zeromq/cppzmq.git
+      GIT_TAG v4.3.0
+      UPDATE_COMMAND ""
+      INSTALL_COMMAND ""
+      CONFIGURE_COMMAND ""
+      BUILD_COMMAND ""
+      CMAKE_ARGS "${TOOLCHAIN}"	
+      PREFIX "${CMAKE_CURRENT_BINARY_DIR}/external/cppzmq"	
+)
+
+
+ExternalProject_Add (
+      zmq
+      BUILD_IN_SOURCE 1	
+      URL https://github.com/zeromq/libzmq/releases/download/v4.3.1/zeromq-4.3.1.tar.gz
+      UPDATE_COMMAND ""
+      PATCH_COMMAND cp  ${CMAKE_CURRENT_SOURCE_DIR}/patches/ip_resolver.cpp  ${CMAKE_CURRENT_BINARY_DIR}/external/libzmq/src/zmq/src/
+      INSTALL_COMMAND make install
+      CONFIGURE_COMMAND ./configure --without-docs --enable-static --prefix=${CMAKE_CURRENT_BINARY_DIR}/external/libzmq CXX=${CMAKE_CXX_COMPILER} CC=${CMAKE_C_COMPILER} ${CONFIG_HOST}
+      PREFIX "${CMAKE_CURRENT_BINARY_DIR}/external/libzmq"
+      BUILD_COMMAND make -j8
+)
+
+
+add_library(libzmq STATIC IMPORTED)
+set_target_properties(libzmq PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/external/libzmq/lib/libzmq.a)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/external/variant/include)
+include_directories(${CMAKE_CURRENT_BINARY_DIR}/external/libzmq/include)
+include_directories(${CMAKE_CURRENT_BINARY_DIR}/external/cppzmq/src/cppzmq)
+
+add_executable(server test/server.cpp)
+target_link_libraries(server libzmq pthread rt)
+add_dependencies(server zmq cppzmq)
+
+add_executable(client test/client.cpp)
+target_link_libraries(client libzmq pthread rt)
+add_dependencies(client zmq cppzmq)
+
+

+set(CMAKE_C_COMPILER "/usr/bin/cc")
+set(CMAKE_C_COMPILER_ARG1 "")
+set(CMAKE_C_COMPILER_ID "GNU")
+set(CMAKE_C_COMPILER_VERSION "5.4.0")
+set(CMAKE_C_COMPILER_VERSION_INTERNAL "")
+set(CMAKE_C_COMPILER_WRAPPER "")
+set(CMAKE_C_STANDARD_COMPUTED_DEFAULT "11")
+set(CMAKE_C_EXTENSIONS_COMPUTED_DEFAULT "ON")
+set(CMAKE_C_COMPILE_FEATURES "c_std_90;c_function_prototypes;c_std_99;c_restrict;c_variadic_macros;c_std_11;c_static_assert")
+set(CMAKE_C90_COMPILE_FEATURES "c_std_90;c_function_prototypes")
+set(CMAKE_C99_COMPILE_FEATURES "c_std_99;c_restrict;c_variadic_macros")
+set(CMAKE_C11_COMPILE_FEATURES "c_std_11;c_static_assert")
+set(CMAKE_C17_COMPILE_FEATURES "")
+set(CMAKE_C23_COMPILE_FEATURES "")
+
+set(CMAKE_C_PLATFORM_ID "Linux")
+set(CMAKE_C_SIMULATE_ID "")
+set(CMAKE_C_COMPILER_FRONTEND_VARIANT "")
+set(CMAKE_C_SIMULATE_VERSION "")
+
+
+
+
+set(CMAKE_AR "/usr/bin/ar")
+set(CMAKE_C_COMPILER_AR "/usr/bin/gcc-ar-5")
+set(CMAKE_RANLIB "/usr/bin/ranlib")
+set(CMAKE_C_COMPILER_RANLIB "/usr/bin/gcc-ranlib-5")
+set(CMAKE_LINKER "/usr/bin/ld")
+set(CMAKE_MT "")
+set(CMAKE_COMPILER_IS_GNUCC 1)
+set(CMAKE_C_COMPILER_LOADED 1)
+set(CMAKE_C_COMPILER_WORKS TRUE)
+set(CMAKE_C_ABI_COMPILED TRUE)
+
+set(CMAKE_C_COMPILER_ENV_VAR "CC")
+
+set(CMAKE_C_COMPILER_ID_RUN 1)
+set(CMAKE_C_SOURCE_FILE_EXTENSIONS c;m)
+set(CMAKE_C_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC)
+set(CMAKE_C_LINKER_PREFERENCE 10)
+
+# Save compiler ABI information.
+set(CMAKE_C_SIZEOF_DATA_PTR "8")
+set(CMAKE_C_COMPILER_ABI "ELF")
+set(CMAKE_C_BYTE_ORDER "LITTLE_ENDIAN")
+set(CMAKE_C_LIBRARY_ARCHITECTURE "x86_64-linux-gnu")
+
+if(CMAKE_C_SIZEOF_DATA_PTR)
+  set(CMAKE_SIZEOF_VOID_P "${CMAKE_C_SIZEOF_DATA_PTR}")
+endif()
+
+if(CMAKE_C_COMPILER_ABI)
+  set(CMAKE_INTERNAL_PLATFORM_ABI "${CMAKE_C_COMPILER_ABI}")
+endif()
+
+if(CMAKE_C_LIBRARY_ARCHITECTURE)
+  set(CMAKE_LIBRARY_ARCHITECTURE "x86_64-linux-gnu")
+endif()
+
+set(CMAKE_C_CL_SHOWINCLUDES_PREFIX "")
+if(CMAKE_C_CL_SHOWINCLUDES_PREFIX)
+  set(CMAKE_CL_SHOWINCLUDES_PREFIX "${CMAKE_C_CL_SHOWINCLUDES_PREFIX}")
+endif()
+
+
+
+
+
+set(CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES "/usr/lib/gcc/x86_64-linux-gnu/5/include;/usr/local/include;/usr/lib/gcc/x86_64-linux-gnu/5/include-fixed;/usr/include/x86_64-linux-gnu;/usr/include")
+set(CMAKE_C_IMPLICIT_LINK_LIBRARIES "gcc;gcc_s;c;gcc;gcc_s")
+set(CMAKE_C_IMPLICIT_LINK_DIRECTORIES "/usr/lib/gcc/x86_64-linux-gnu/5;/usr/lib/x86_64-linux-gnu;/usr/lib;/lib/x86_64-linux-gnu;/lib")
+set(CMAKE_C_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "")

+set(CMAKE_CXX_COMPILER "/usr/bin/c++")
+set(CMAKE_CXX_COMPILER_ARG1 "")
+set(CMAKE_CXX_COMPILER_ID "GNU")
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+set(CMAKE_CXX_COMPILER_VERSION_INTERNAL "")
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+set(CMAKE_CXX_STANDARD_COMPUTED_DEFAULT "98")
+set(CMAKE_CXX_EXTENSIONS_COMPUTED_DEFAULT "ON")
+set(CMAKE_CXX_COMPILE_FEATURES "cxx_std_98;cxx_template_template_parameters;cxx_std_11;cxx_alias_templates;cxx_alignas;cxx_alignof;cxx_attributes;cxx_auto_type;cxx_constexpr;cxx_decltype;cxx_decltype_incomplete_return_types;cxx_default_function_template_args;cxx_defaulted_functions;cxx_defaulted_move_initializers;cxx_delegating_constructors;cxx_deleted_functions;cxx_enum_forward_declarations;cxx_explicit_conversions;cxx_extended_friend_declarations;cxx_extern_templates;cxx_final;cxx_func_identifier;cxx_generalized_initializers;cxx_inheriting_constructors;cxx_inline_namespaces;cxx_lambdas;cxx_local_type_template_args;cxx_long_long_type;cxx_noexcept;cxx_nonstatic_member_init;cxx_nullptr;cxx_override;cxx_range_for;cxx_raw_string_literals;cxx_reference_qualified_functions;cxx_right_angle_brackets;cxx_rvalue_references;cxx_sizeof_member;cxx_static_assert;cxx_strong_enums;cxx_thread_local;cxx_trailing_return_types;cxx_unicode_literals;cxx_uniform_initialization;cxx_unrestricted_unions;cxx_user_literals;cxx_variadic_macros;cxx_variadic_templates;cxx_std_14;cxx_aggregate_default_initializers;cxx_attribute_deprecated;cxx_binary_literals;cxx_contextual_conversions;cxx_decltype_auto;cxx_digit_separators;cxx_generic_lambdas;cxx_lambda_init_captures;cxx_relaxed_constexpr;cxx_return_type_deduction;cxx_variable_templates;cxx_std_17")
+set(CMAKE_CXX98_COMPILE_FEATURES "cxx_std_98;cxx_template_template_parameters")
+set(CMAKE_CXX11_COMPILE_FEATURES "cxx_std_11;cxx_alias_templates;cxx_alignas;cxx_alignof;cxx_attributes;cxx_auto_type;cxx_constexpr;cxx_decltype;cxx_decltype_incomplete_return_types;cxx_default_function_template_args;cxx_defaulted_functions;cxx_defaulted_move_initializers;cxx_delegating_constructors;cxx_deleted_functions;cxx_enum_forward_declarations;cxx_explicit_conversions;cxx_extended_friend_declarations;cxx_extern_templates;cxx_final;cxx_func_identifier;cxx_generalized_initializers;cxx_inheriting_constructors;cxx_inline_namespaces;cxx_lambdas;cxx_local_type_template_args;cxx_long_long_type;cxx_noexcept;cxx_nonstatic_member_init;cxx_nullptr;cxx_override;cxx_range_for;cxx_raw_string_literals;cxx_reference_qualified_functions;cxx_right_angle_brackets;cxx_rvalue_references;cxx_sizeof_member;cxx_static_assert;cxx_strong_enums;cxx_thread_local;cxx_trailing_return_types;cxx_unicode_literals;cxx_uniform_initialization;cxx_unrestricted_unions;cxx_user_literals;cxx_variadic_macros;cxx_variadic_templates")
+set(CMAKE_CXX14_COMPILE_FEATURES "cxx_std_14;cxx_aggregate_default_initializers;cxx_attribute_deprecated;cxx_binary_literals;cxx_contextual_conversions;cxx_decltype_auto;cxx_digit_separators;cxx_generic_lambdas;cxx_lambda_init_captures;cxx_relaxed_constexpr;cxx_return_type_deduction;cxx_variable_templates")
+set(CMAKE_CXX17_COMPILE_FEATURES "cxx_std_17")
+set(CMAKE_CXX20_COMPILE_FEATURES "")
+set(CMAKE_CXX23_COMPILE_FEATURES "")
+
+set(CMAKE_CXX_PLATFORM_ID "Linux")
+set(CMAKE_CXX_SIMULATE_ID "")
+set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "")
+set(CMAKE_CXX_SIMULATE_VERSION "")
+
+
+
+
+set(CMAKE_AR "/usr/bin/ar")
+set(CMAKE_CXX_COMPILER_AR "/usr/bin/gcc-ar-5")
+set(CMAKE_RANLIB "/usr/bin/ranlib")
+set(CMAKE_CXX_COMPILER_RANLIB "/usr/bin/gcc-ranlib-5")
+set(CMAKE_LINKER "/usr/bin/ld")
+set(CMAKE_MT "")
+set(CMAKE_COMPILER_IS_GNUCXX 1)
+set(CMAKE_CXX_COMPILER_LOADED 1)
+set(CMAKE_CXX_COMPILER_WORKS TRUE)
+set(CMAKE_CXX_ABI_COMPILED TRUE)
+
+set(CMAKE_CXX_COMPILER_ENV_VAR "CXX")
+
+set(CMAKE_CXX_COMPILER_ID_RUN 1)
+set(CMAKE_CXX_SOURCE_FILE_EXTENSIONS C;M;c++;cc;cpp;cxx;m;mm;mpp;CPP;ixx;cppm)
+set(CMAKE_CXX_IGNORE_EXTENSIONS inl;h;hpp;HPP;H;o;O;obj;OBJ;def;DEF;rc;RC)
+
+foreach (lang C OBJC OBJCXX)
+  if (CMAKE_${lang}_COMPILER_ID_RUN)
+    foreach(extension IN LISTS CMAKE_${lang}_SOURCE_FILE_EXTENSIONS)
+      list(REMOVE_ITEM CMAKE_CXX_SOURCE_FILE_EXTENSIONS ${extension})
+    endforeach()
+  endif()
+endforeach()
+
+set(CMAKE_CXX_LINKER_PREFERENCE 30)
+set(CMAKE_CXX_LINKER_PREFERENCE_PROPAGATES 1)
+
+# Save compiler ABI information.
+set(CMAKE_CXX_SIZEOF_DATA_PTR "8")
+set(CMAKE_CXX_COMPILER_ABI "ELF")
+set(CMAKE_CXX_BYTE_ORDER "LITTLE_ENDIAN")
+set(CMAKE_CXX_LIBRARY_ARCHITECTURE "x86_64-linux-gnu")
+
+if(CMAKE_CXX_SIZEOF_DATA_PTR)
+  set(CMAKE_SIZEOF_VOID_P "${CMAKE_CXX_SIZEOF_DATA_PTR}")
+endif()
+
+if(CMAKE_CXX_COMPILER_ABI)
+  set(CMAKE_INTERNAL_PLATFORM_ABI "${CMAKE_CXX_COMPILER_ABI}")
+endif()
+
+if(CMAKE_CXX_LIBRARY_ARCHITECTURE)
+  set(CMAKE_LIBRARY_ARCHITECTURE "x86_64-linux-gnu")
+endif()
+
+set(CMAKE_CXX_CL_SHOWINCLUDES_PREFIX "")
+if(CMAKE_CXX_CL_SHOWINCLUDES_PREFIX)
+  set(CMAKE_CL_SHOWINCLUDES_PREFIX "${CMAKE_CXX_CL_SHOWINCLUDES_PREFIX}")
+endif()
+
+
+
+
+
+set(CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES "/usr/include/c++/5;/usr/include/x86_64-linux-gnu/c++/5;/usr/include/c++/5/backward;/usr/lib/gcc/x86_64-linux-gnu/5/include;/usr/local/include;/usr/lib/gcc/x86_64-linux-gnu/5/include-fixed;/usr/include/x86_64-linux-gnu;/usr/include")
+set(CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "stdc++;m;gcc_s;gcc;c;gcc_s;gcc")
+set(CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES "/usr/lib/gcc/x86_64-linux-gnu/5;/usr/lib/x86_64-linux-gnu;/usr/lib;/lib/x86_64-linux-gnu;/lib")
+set(CMAKE_CXX_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "")

+set(CMAKE_HOST_SYSTEM "Linux-4.15.0-112-generic")
+set(CMAKE_HOST_SYSTEM_NAME "Linux")
+set(CMAKE_HOST_SYSTEM_VERSION "4.15.0-112-generic")
+set(CMAKE_HOST_SYSTEM_PROCESSOR "x86_64")
+
+
+
+set(CMAKE_SYSTEM "Linux-4.15.0-112-generic")
+set(CMAKE_SYSTEM_NAME "Linux")
+set(CMAKE_SYSTEM_VERSION "4.15.0-112-generic")
+set(CMAKE_SYSTEM_PROCESSOR "x86_64")
+
+set(CMAKE_CROSSCOMPILING "FALSE")
+
+set(CMAKE_SYSTEM_LOADED 1)

+# This file is generated by cmake for dependency checking of the CMakeCache.txt file

+#include <vector>
+#include <thread>
+#include <memory>
+#include <functional>
+
+#include <zmq.hpp>
+#include <zhelpers.hpp>
+
+class client_task {
+public:
+    client_task()
+        : ctx_(1),
+          client_socket_(ctx_, ZMQ_DEALER)
+    {}
+
+    void start() {
+        char identity[10] = {};
+        sprintf(identity, "%04X-%04X", within(0x10000), within(0x10000));
+        printf("%s\n", identity);
+        client_socket_.setsockopt(ZMQ_IDENTITY, identity, strlen(identity));
+        client_socket_.connect("tcp://localhost:5570");
+
+        zmq::pollitem_t items[] = {
+            { client_socket_, 0, ZMQ_POLLIN, 0 } };
+        int request_nbr = 0;
+        try {
+            while (true) {
+                for (int i = 0; i < 100; ++i) {
+                    zmq::poll(items, 1, 10);
+                    if (items[0].revents & ZMQ_POLLIN) {
+                        printf("\n%s ", identity);
+                        s_dump(client_socket_);
+                    }
+                }
+                char request_string[16] = {};
+                sprintf(request_string, "request #%d", ++request_nbr);
+                client_socket_.send(request_string, strlen(request_string));
+            }
+        }
+        catch (std::exception &e) {}
+    }
+
+private:
+    zmq::context_t ctx_;
+    zmq::socket_t client_socket_;
+};
+
+int main(void){
+    client_task ct1;
+    client_task ct2;
+    client_task ct3;
+}
+

+#include <vector>
+#include <thread>
+#include <memory>
+#include <functional>
+
+#include <zmq.hpp>
+#include <zhelpers.hpp>
+
+
+class server_worker {
+public:
+    server_worker(zmq::context_t &ctx, int sock_type)
+        : ctx_(ctx),
+          worker_(ctx_, sock_type)
+    {}
+
+    void work() {
+            worker_.connect("inproc://backend");
+
+        try {
+            while (true) {
+                zmq::message_t identity;
+                zmq::message_t msg;
+                zmq::message_t copied_id;
+                zmq::message_t copied_msg;
+                worker_.recv(&identity);
+                worker_.recv(&msg);
+
+                int replies = within(5);
+                for (int reply = 0; reply < replies; ++reply) {
+                    s_sleep(within(1000) + 1);
+                    copied_id.copy(&identity);
+                    copied_msg.copy(&msg);
+                    worker_.send(copied_id, ZMQ_SNDMORE);
+                    worker_.send(copied_msg);
+                }
+            }
+        }
+        catch (std::exception &e) {}
+    }
+
+
+
+private:
+    zmq::context_t &ctx_;
+    zmq::socket_t worker_;
+};
+
+
+class server_task {
+public:
+    server_task()
+        : ctx_(1),
+          frontend_(ctx_, ZMQ_ROUTER),
+          backend_(ctx_, ZMQ_DEALER)
+    {}
+
+    enum { kMaxThread = 5 };
+
+    void run() {
+        frontend_.bind("tcp://*:5570");
+        backend_.bind("inproc://backend");
+
+        std::vector<server_worker *> worker;
+        std::vector<std::thread *> worker_thread;
+        for (int i = 0; i < kMaxThread; ++i) {
+            worker.push_back(new server_worker(ctx_, ZMQ_DEALER));
+
+            worker_thread.push_back(new std::thread(std::bind(&server_worker::work, worker[i])));
+            worker_thread[i]->detach();
+        }
+
+
+        try {
+            zmq::proxy(static_cast<void*>(frontend_),
+                       static_cast<void*>(backend_),
+                       nullptr);
+        }
+        catch (std::exception &e) {}
+
+        for (int i = 0; i < kMaxThread; ++i) {
+            delete worker[i];
+            delete worker_thread[i];
+        }
+    }
+
+
+private:
+    zmq::context_t ctx_;
+    zmq::socket_t frontend_;
+    zmq::socket_t backend_;
+};
+
+
+int main(void){
+    server_task st;    
+
+    /*server = ServerTask(3)
+    server.start()
+    server.join()
+
+    std::thread t1(std::bind(&client_task::start, &ct1));
+    std::thread t2(std::bind(&client_task::start, &ct2));
+    std::thread t3(std::bind(&client_task::start, &ct3));
+    std::thread t4(std::bind(&server_task::run, &st));
+
+    t1.detach();
+    t2.detach();
+    t3.detach();
+    t4.detach();*/
+    
+}
+

+#include <zmq.hpp>
+#include <iostream>
+#include <sstream>
+
+int main (int argc, char *argv[])
+{
+    zmq::context_t context (1);
+
+    std::cout << "Collecting updates from weather server..." << std::endl;
+    zmq::socket_t subscriber (context, zmq::socket_type::sub);
+    subscriber.connect("tcp://localhost:5556");
+
+    const char *filter = (argc > 1)? argv [1]: "10001 ";
+    subscriber.setsockopt(ZMQ_SUBSCRIBE, filter, strlen(filter));
+
+    int update_nbr;
+    long total_temp = 0;
+    for (update_nbr = 0; update_nbr < 20; update_nbr++) {
+
+        zmq::message_t update;
+        int zipcode, temperature, relhumidity;
+
+        subscriber.recv(update, zmq::recv_flags::none);
+
+        std::istringstream iss(static_cast<char*>(update.data()));
+	iss >> zipcode >> temperature >> relhumidity ;
+
+	total_temp += temperature;
+
+	std::cout << "Receive temperature for zipcode '"<< filter <<"' was "<<(int) (temperature) <<"F"<< std::endl;
+    }
+
+    std::cout << "Average temperature for zipcode '"<< filter
+    			<<"' was "<<(int) (total_temp / update_nbr) <<"F"
+    			<< std::endl;
+    return 0;
+}

+#include <zmq.hpp>
+#include <stdio.h>
+#include <stdlib.h>
+#include <iostream>
+#include <time.h>
+#include <unistd.h>
+#if (defined (WIN32))
+#include <zhelpers.hpp>
+#endif
+
+#define within(num) (int) ((float) num * random () / (RAND_MAX + 1.0))
+
+int main () {
+
+    std::cout<<"Publishing updates at weather server..."<<std::endl;
+
+    zmq::context_t context (1);
+    zmq::socket_t publisher (context, zmq::socket_type::pub);
+    publisher.bind("tcp://*:5556");
+    publisher.bind("ipc://weather.ipc");
+		
+    srandom ((unsigned) time (NULL));
+    while (1) {
+
+        int zipcode, temperature, relhumidity;
+
+        zipcode     = within (100000);
+        temperature = within (215) - 80;
+        relhumidity = within (50) + 10;
+
+        zmq::message_t message(20);
+        snprintf ((char *) message.data(), 20 ,
+        	"%05d %d %d", zipcode, temperature, relhumidity);
+        publisher.send(message, zmq::send_flags::none);
+	
+
+    }
+    return 0;
+}

+#include <zmq.hpp>
+#include <string>
+#include <iostream>
+
+int main ()
+{
+    zmq::context_t context (1);
+    zmq::socket_t socket (context, zmq::socket_type::req);
+
+    std::cout << "Connecting to hello world server..." << std::endl;
+    socket.connect ("tcp://localhost:5555");
+
+    for (int request_nbr = 0; request_nbr != 10; request_nbr++) {
+        zmq::message_t request (5);
+        memcpy (request.data (), "Hello", 5);
+        std::cout << "Sending request " << request_nbr << "..." << std::endl;
+        socket.send (request, zmq::send_flags::none);
+
+        zmq::message_t reply;
+        socket.recv (reply, zmq::recv_flags::none);
+        std::cout << "Received reply " << request_nbr << std::endl;
+    }
+    return 0;
+}

+#include <zmq.hpp>
+#include <string>
+#include <iostream>
+#include <unistd.h>
+
+int main () {
+    zmq::context_t context (1);
+    zmq::socket_t socket (context, zmq::socket_type::rep);
+    socket.bind ("tcp://*:5555");
+
+    while (true) {
+        zmq::message_t request;
+        socket.recv (request, zmq::recv_flags::none);
+        std::cout << "Received request" << std::endl;
+
+        sleep(1);
+
+        zmq::message_t reply (5);
+        memcpy (reply.data (), "World", 5);
+        socket.send (reply, zmq::send_flags::none);
+    }
+    return 0;
+}