marklincan: use async tcp connect the prevent "hanging", see #150

server/src/hardware/protocol/marklincan/iohandler/networkiohandler.cpp

@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2023 Reinder Feenstra
+ * Copyright (C) 2023-2024 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -21,6 +21,7 @@
  */
 
 #include "networkiohandler.hpp"
+#include "../kernel.hpp"
 #include "../../../../utils/endian.hpp"
 
 namespace MarklinCAN {
@@ -28,6 +29,7 @@ namespace MarklinCAN {
 void NetworkIOHandler::start()
 {
   read();
+  m_kernel.started();
 }
 
 bool NetworkIOHandler::send(const Message& message)

server/src/hardware/protocol/marklincan/iohandler/simulationiohandler.cpp

@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2023 Reinder Feenstra
+ * Copyright (C) 2023-2024 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -42,6 +42,7 @@ void SimulationIOHandler::start()
   auto expireAfter = std::chrono::milliseconds(Random::value<int>(0, bootstrapCANInterval.count()));
   startBootloaderCANTimer(expireAfter);
   startPingTimer(expireAfter + 1s);
+  m_kernel.started();
 }
 
 void SimulationIOHandler::startBootloaderCANTimer(std::chrono::milliseconds expireAfter)

server/src/hardware/protocol/marklincan/iohandler/socketcaniohandler.cpp

@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2023 Reinder Feenstra
+ * Copyright (C) 2023-2024 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -67,6 +67,7 @@ SocketCANIOHandler::SocketCANIOHandler(Kernel& kernel, const std::string& interf
 void SocketCANIOHandler::start()
 {
   read();
+  m_kernel.started();
 }
 
 void SocketCANIOHandler::stop()

server/src/hardware/protocol/marklincan/iohandler/tcpiohandler.cpp

@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2023 Reinder Feenstra
+ * Copyright (C) 2023-2024 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -46,20 +46,37 @@ void TCPIOHandler::start()
   if(ec)
     throw LogMessageException(LogMessage::E2003_MAKE_ADDRESS_FAILED_X, ec);
 
-  m_socket.connect(m_endpoint, ec);
+ m_socket.async_connect(m_endpoint,
-  if(ec)
+    [this](const boost::system::error_code& err)
-    throw LogMessageException(LogMessage::E2005_SOCKET_CONNECT_FAILED_X, ec);
+    {
+      if(!err)
+      {
+        m_socket.set_option(boost::asio::socket_base::linger(true, 0));
+        m_socket.set_option(boost::asio::ip::tcp::no_delay(true));
 
-  m_socket.set_option(boost::asio::socket_base::linger(true, 0));
+        m_connected = true;
-  m_socket.set_option(boost::asio::ip::tcp::no_delay(true));
 
-  NetworkIOHandler::start();
+        write();
+
+        NetworkIOHandler::start();
+      }
+      else if(err != boost::asio::error::operation_aborted)
+      {
+        EventLoop::call(
+          [this, err]()
+          {
+            Log::log(m_kernel.logId, LogMessage::E2005_SOCKET_CONNECT_FAILED_X, err);
+            m_kernel.error();
+          });
+      }
+    });
 }
 
 void TCPIOHandler::stop()
 {
   m_socket.cancel();
   m_socket.close();
+  m_connected = false;
 }
 
 void TCPIOHandler::read()
@@ -99,6 +116,11 @@ void TCPIOHandler::read()
 
 void TCPIOHandler::write()
 {
+  if(m_writeBufferOffset == 0 || !m_connected)
+  {
+    return;
+  }
+
   m_socket.async_write_some(boost::asio::buffer(m_writeBuffer.data(), m_writeBufferOffset),
     [this](const boost::system::error_code& ec, std::size_t bytesTransferred)
     {

server/src/hardware/protocol/marklincan/iohandler/tcpiohandler.hpp

@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2023 Reinder Feenstra
+ * Copyright (C) 2023-2024 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -38,6 +38,7 @@ class TCPIOHandler final : public NetworkIOHandler
     boost::asio::ip::tcp::endpoint m_endpoint;
     std::array<std::byte, 1500> m_readBuffer;
     size_t m_readBufferOffset;
+    bool m_connected = false;
 
     void read() final;
     void write() final;

server/src/hardware/protocol/marklincan/kernel.cpp

@@ -159,26 +159,7 @@ void Kernel::start()
             Log::log(logId, e.message(), e.args());
             error();
           });
-        return;
       }
-
-      // add Traintastic to the node list
-      {
-        Node node;
-        node.uid = m_config.nodeUID;
-        node.deviceName = nodeDeviceName;
-        node.articleNumber = nodeArticleNumber;
-        node.serialNumber = m_config.nodeSerialNumber;
-        node.softwareVersionMajor = TRAINTASTIC_VERSION_MAJOR;
-        node.softwareVersionMinor = TRAINTASTIC_VERSION_MINOR;
-        node.deviceId = DeviceId::Traintastic;
-
-        nodeChanged(node);
-
-        m_nodes.emplace(m_config.nodeUID, node);
-      }
-
-      nextState();
     });
 
 #ifndef NDEBUG
@@ -205,6 +186,27 @@ void Kernel::stop()
 #endif
 }
 
+void Kernel::started()
+{
+  // add Traintastic to the node list
+  {
+    Node node;
+    node.uid = m_config.nodeUID;
+    node.deviceName = nodeDeviceName;
+    node.articleNumber = nodeArticleNumber;
+    node.serialNumber = m_config.nodeSerialNumber;
+    node.softwareVersionMajor = TRAINTASTIC_VERSION_MAJOR;
+    node.softwareVersionMinor = TRAINTASTIC_VERSION_MINOR;
+    node.deviceId = DeviceId::Traintastic;
+
+    nodeChanged(node);
+
+    m_nodes.emplace(m_config.nodeUID, node);
+  }
+
+  nextState();
+}
+
 void Kernel::receive(const Message& message)
 {
   assert(isKernelThread());
@@ -957,7 +959,7 @@ void Kernel::changeState(State value)
       break;
 
     case State::Started:
-      started();
+      KernelBase::started();
       break;
   }
 }

server/src/hardware/protocol/marklincan/kernel.hpp

@@ -226,6 +226,12 @@ class Kernel : public ::KernelBase
      */
     void stop();
 
+    /**
+     * \brief Notify kernel the IO handler is started.
+     * \note This function must run in the kernel's IO context
+     */
+    void started() final;
+
     /**
      * \brief ...
      *