diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 34bd6dc..8740832 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -92,9 +92,7 @@ jobs:
         with:
           environment-file: environment-dev.yml
           environment-name: xeus-zmq
-          init-shell: >-
-            powershell
-            cmd.exe
+          init-shell: cmd.exe
 
       - name: Make build directory
         run: mkdir build
diff --git a/include/xeus-zmq/xclient_zmq.hpp b/include/xeus-zmq/xclient_zmq.hpp
index 38ca115..898a8b9 100644
--- a/include/xeus-zmq/xclient_zmq.hpp
+++ b/include/xeus-zmq/xclient_zmq.hpp
@@ -10,6 +10,8 @@
 #ifndef XEUS_CLIENT_ZMQ_HPP
 #define XEUS_CLIENT_ZMQ_HPP
 
+#include <optional>
+
 #include <nlohmann/json.hpp>
 
 #include "xeus/xeus_context.hpp"
@@ -28,8 +30,7 @@ namespace xeus
 
         using listener = std::function<void(xmessage)>;
 
-        xclient_zmq::xclient_zmq(xcontext& context,
-                                const xeus::xconfiguration& config);
+        explicit xclient_zmq(std::unique_ptr<xclient_zmq_impl> impl);
         ~xclient_zmq();
 
         void send_on_shell(xmessage msg);
@@ -52,6 +53,11 @@ namespace xeus
     private:
         std::unique_ptr<xclient_zmq_impl> p_client_impl;
     };
+
+    XEUS_ZMQ_API
+    std::unique_ptr<xclient_zmq> make_xclient_zmq(xcontext& context,
+                                              const xconfiguration& config,
+                                              nl::json::error_handler_t eh = nl::json::error_handler_t::strict);
 }
 
 #endif
\ No newline at end of file
diff --git a/src/xclient_messenger.cpp b/src/xclient_messenger.cpp
index e8749da..bb2220f 100644
--- a/src/xclient_messenger.cpp
+++ b/src/xclient_messenger.cpp
@@ -16,6 +16,7 @@ namespace nl = nlohmann;
 namespace xeus
 {
     xclient_messenger::xclient_messenger(zmq::context_t& context)
+        : m_iopub_controller(context, zmq::socket_type::req)
     {
     }
 
@@ -25,12 +26,17 @@ namespace xeus
 
     void xclient_messenger::connect()
     {
-        // TODO
+        m_iopub_controller.set(zmq::sockopt::linger, get_socket_linger());
+        m_iopub_controller.connect(get_controller_end_point("iopub"));
     }
 
     void xclient_messenger::stop_channels()
     {
-        // TODO
-    }
-}
+        zmq::message_t stop_msg("stop", 4);
+        zmq::message_t response;
 
+        // Wait for iopub answer
+        m_iopub_controller.send(stop_msg, zmq::send_flags::none);
+        (void)m_iopub_controller.recv(response);
+    }
+}
\ No newline at end of file
diff --git a/src/xclient_messenger.hpp b/src/xclient_messenger.hpp
index 6d55c97..7975436 100644
--- a/src/xclient_messenger.hpp
+++ b/src/xclient_messenger.hpp
@@ -24,7 +24,8 @@ namespace xeus
         void stop_channels();
 
     private:
-
-        // Add some relevant sockets
+        zmq::socket_t m_iopub_controller;
     };
-}
\ No newline at end of file
+}
+
+#endif
\ No newline at end of file
diff --git a/src/xclient_zmq.cpp b/src/xclient_zmq.cpp
index 65c89c7..25a8829 100644
--- a/src/xclient_zmq.cpp
+++ b/src/xclient_zmq.cpp
@@ -13,9 +13,8 @@
 namespace xeus
 {
 
-    xclient_zmq::xclient_zmq(xcontext& context,
-                            const xeus::xconfiguration& config)
-        : p_client_impl(std::make_unique<xclient_zmq_impl>(context.get_wrapped_context<zmq::context_t>(), config))
+    xclient_zmq::xclient_zmq(std::unique_ptr<xclient_zmq_impl> impl)
+        : p_client_impl(std::move(impl))
     {
     }
 
@@ -81,6 +80,14 @@ namespace xeus
 
     std::optional<xmessage> xclient_zmq::pop_iopub_message()
     {
-        p_client_impl->pop_iopub_message();
+        return p_client_impl->pop_iopub_message();
+    }
+
+    std::unique_ptr<xclient_zmq> make_xclient_zmq(xcontext& context,
+                                                const xconfiguration& config,
+                                                nl::json::error_handler_t eh)
+    {
+        auto impl = std::make_unique<xclient_zmq_impl>(context.get_wrapped_context<zmq::context_t>(), config, eh);
+        return std::make_unique<xclient_zmq>(std::move(impl));
     }
 }
diff --git a/src/xclient_zmq_impl.cpp b/src/xclient_zmq_impl.cpp
index 0e93c1d..4f682cc 100644
--- a/src/xclient_zmq_impl.cpp
+++ b/src/xclient_zmq_impl.cpp
@@ -7,6 +7,8 @@
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/
 
+#include <iostream>
+
 #include "xeus-zmq/xauthentication.hpp"
 #include "xclient_zmq_impl.hpp"
 #include "xeus-zmq/xzmq_serializer.hpp"
@@ -15,13 +17,14 @@ namespace xeus
 {
 
     xclient_zmq_impl::xclient_zmq_impl(zmq::context_t& context,
-                                    const xeus::xconfiguration& config)
+                                    const xeus::xconfiguration& config,
+                                    nl::json::error_handler_t eh)
         : p_auth(make_xauthentication(config.m_signature_scheme, config.m_key))
         , m_shell_client(context, config)
         , m_control_client(context, config)
         , m_iopub_client(context, config)
         , p_messenger(context)
-        , m_error_handler(nl::json::error_handler_t::strict)
+        , m_error_handler(eh)
     {
     }
 
@@ -80,7 +83,7 @@ namespace xeus
         return m_iopub_client.iopub_queue_size();
     }
 
-    std::optional<xmessage> xclient_zmq_impl::pop_iopub_message();
+    std::optional<xmessage> xclient_zmq_impl::pop_iopub_message()
     {
         return m_iopub_client.pop_iopub_message();
     }
@@ -159,7 +162,7 @@ namespace xeus
 
         if (pending_message.has_value())
         {
-            notify_iopub_listener(*pending_message);
+            notify_iopub_listener(std::move(*pending_message));
         } else {
             poll(-1);
         }
diff --git a/src/xclient_zmq_impl.hpp b/src/xclient_zmq_impl.hpp
index 974bd1a..c85f4d2 100644
--- a/src/xclient_zmq_impl.hpp
+++ b/src/xclient_zmq_impl.hpp
@@ -25,6 +25,7 @@
 
 namespace xeus
 {
+    class xauthentication;
 
     class xclient_zmq_impl
     {
@@ -32,7 +33,11 @@ namespace xeus
         using iopub_client_ptr = std::unique_ptr<xiopub_client>;
         using listener = std::function<void(xmessage)>;
 
-        virtual ~xclient_zmq_impl() = default;
+        xclient_zmq_impl(zmq::context_t& context,
+                    const xconfiguration& config,
+                    nl::json::error_handler_t eh);
+
+        ~xclient_zmq_impl();
 
         xclient_zmq_impl(const xclient_zmq_impl&) = delete;
         xclient_zmq_impl& operator=(const xclient_zmq_impl&) = delete;
@@ -72,10 +77,6 @@ namespace xeus
 
         xmessage deserialize(zmq::multipart_t& wire_msg) const;
 
-    protected:
-        xclient_zmq_impl(zmq::context_t& context,
-                        const xeus::xconfiguration& config);
-
     private:
         void start_iopub_thread();
         void poll(long timeout);
@@ -83,12 +84,12 @@ namespace xeus
         using authentication_ptr = std::unique_ptr<xauthentication>;
         authentication_ptr p_auth;
 
-        xclient_messenger p_messenger;
-
         xdealer_channel m_shell_client;
         xdealer_channel m_control_client;
         xiopub_client m_iopub_client;
 
+        xclient_messenger p_messenger;
+
         nl::json::error_handler_t m_error_handler;
 
         listener m_shell_listener;
diff --git a/src/xdealer_channel.cpp b/src/xdealer_channel.cpp
index 8a17873..a3f96e7 100644
--- a/src/xdealer_channel.cpp
+++ b/src/xdealer_channel.cpp
@@ -7,6 +7,8 @@
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/
 
+#include "xeus-zmq/xmiddleware.hpp"
+
 #include "xdealer_channel.hpp"
 
 namespace xeus
@@ -35,8 +37,8 @@ namespace xeus
     std::optional<zmq::multipart_t> xdealer_channel::receive_message(long timeout)
     {
         zmq::multipart_t wire_msg;
-        m_socket.setsockopt(ZMQ_RCVTIMEO, timeout);
-        if (wire_msg.recv(m_socket, zmq::recv_flags::none))
+        m_socket.set(zmq::sockopt::linger, timeout);
+        if (wire_msg.recv(m_socket))
         {
             return wire_msg;
         } else {
@@ -44,7 +46,7 @@ namespace xeus
         }
     }
 
-    zmq::socket& xdealer_channel::get_socket()
+    zmq::socket_t& xdealer_channel::get_socket()
     {
         return m_socket;
     }
diff --git a/src/xdealer_channel.hpp b/src/xdealer_channel.hpp
index d3d30fc..5204870 100644
--- a/src/xdealer_channel.hpp
+++ b/src/xdealer_channel.hpp
@@ -11,6 +11,8 @@
 #define XEUS_DEALER_CHANNEL_HPP
 
 #include "zmq.hpp"
+#include "zmq_addon.hpp"
+
 #include "nlohmann/json.hpp"
 #include "xeus/xkernel_configuration.hpp"
 
@@ -29,7 +31,7 @@ namespace xeus
         void send_message(zmq::multipart_t& message);
         std::optional<zmq::multipart_t> receive_message(long timeout);
 
-        zmq::socket& get_socket();
+        zmq::socket_t& get_socket();
 
     private:
 
diff --git a/src/xiopub_client.cpp b/src/xiopub_client.cpp
index 515dcef..fb98662 100644
--- a/src/xiopub_client.cpp
+++ b/src/xiopub_client.cpp
@@ -7,7 +7,10 @@
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/
 
+#include <iostream>
+
 #include "xiopub_client.hpp"
+#include "xclient_zmq_impl.hpp"
 
 #include "xeus-zmq/xzmq_serializer.hpp"
 
@@ -40,7 +43,7 @@ namespace xeus
         std::lock_guard<std::mutex> guard(m_queue_mutex);
         if (!m_message_queue.empty())
         {
-            xmessage msg = m_message_queue.back();
+            xmessage msg = std::move(m_message_queue.back());
             m_message_queue.pop();
             return msg;
         } else {
@@ -67,7 +70,7 @@ namespace xeus
                     xmessage msg = p_client_impl->deserialize(wire_msg);
                     {
                         std::lock_guard<std::mutex> guard(m_queue_mutex);
-                        m_message_queue.push(msg);
+                        m_message_queue.push(std::move(msg));
                     }
                     p_client_impl->notify_shell_listener(std::move(msg));
                 }
diff --git a/src/xiopub_client.hpp b/src/xiopub_client.hpp
index f3fe4a8..d6c8349 100644
--- a/src/xiopub_client.hpp
+++ b/src/xiopub_client.hpp
@@ -10,13 +10,18 @@
 #ifndef XEUS_IOPUB_CLIENT_HPP
 #define XEUS_IOPUB_CLIENT_HPP
 
+#include <queue>
+#include <mutex>
+
 #include "zmq.hpp"
 #include "nlohmann/json.hpp"
 
+#include "xeus/xmessage.hpp"
 #include "xeus/xeus_context.hpp"
 #include "xeus/xkernel_configuration.hpp"
 
 #include "xeus-zmq/xthread.hpp"
+#include "xeus-zmq/xmiddleware.hpp"
 
 namespace xeus
 {
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8ccb401..08e4531 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -88,7 +88,7 @@ configure_file(
 
 add_executable(test_kernel ${TEST_KERNEL_SOURCES})
 target_link_libraries(test_kernel PRIVATE ${xeus-zmq_TARGET} Threads::Threads)
-target_compile_features(test_kernel PRIVATE cxx_std_11)
+target_compile_features(test_kernel PRIVATE cxx_std_17)
 
 set(CONNECTION_FILE ${CMAKE_CURRENT_SOURCE_DIR}/connection.json)
 
@@ -118,7 +118,7 @@ configure_file(
 
 add_executable(test_kernel_control ${TEST_KERNEL_SPLIT_SOURCES})
 target_link_libraries(test_kernel_control PRIVATE ${xeus-zmq_TARGET} Threads::Threads)
-target_compile_features(test_kernel_control PRIVATE cxx_std_11)
+target_compile_features(test_kernel_control PRIVATE cxx_std_17)
 
 set(CONNECTION_FILE ${CMAKE_CURRENT_SOURCE_DIR}/connection.json)
 
@@ -148,7 +148,7 @@ configure_file(
 
 add_executable(test_kernel_shell ${TEST_KERNEL_SPLIT_SOURCES})
 target_link_libraries(test_kernel_shell PRIVATE ${xeus-zmq_TARGET} Threads::Threads)
-target_compile_features(test_kernel_shell PRIVATE cxx_std_11)
+target_compile_features(test_kernel_shell PRIVATE cxx_std_17)
 
 set(CONNECTION_FILE ${CMAKE_CURRENT_SOURCE_DIR}/connection.json)
 
@@ -175,7 +175,7 @@ if (UNIX)
 
     add_executable(test_kernel_ipc ${TEST_KERNEL_IPC_SOURCES})
     target_link_libraries(test_kernel_ipc PRIVATE ${xeus-zmq_TARGET} Threads::Threads)
-    target_compile_features(test_kernel_ipc PRIVATE cxx_std_11)
+    target_compile_features(test_kernel_ipc PRIVATE cxx_std_17)
 
     # Test_client_ipc
     # ===============
@@ -185,6 +185,6 @@ if (UNIX)
 
     add_executable(test_client_ipc ${TEST_CLIENT_IPC_SOURCES})
     target_link_libraries(test_client_ipc PRIVATE ${xeus-zmq_TARGET} Threads::Threads)
-    target_compile_features(test_client_ipc PRIVATE cxx_std_11)
+    target_compile_features(test_client_ipc PRIVATE cxx_std_17)
 
 endif (UNIX)