Major refactor

CMakeLists.txt

@@ -172,6 +172,7 @@ set(${PROJECT_NAME}_SOURCES
     src/ur/master_board.cpp
     src/ur/rt_state.cpp
     src/ur/messages.cpp
+    src/tcp_socket.cpp
     src/ur_driver.cpp
     src/ur_realtime_communication.cpp
     src/ur_communication.cpp

include/ur_modern_driver/pipeline.h

@@ -23,6 +23,9 @@ public:
   virtual void stopConsumer()
   {
   }
+  virtual void onTimeout()
+  {
+  }
 
   virtual bool consume(shared_ptr<T> product) = 0;
 };
@@ -59,6 +62,13 @@ public:
       con->stopConsumer();
     }
   }
+  virtual void onTimeout()
+  {
+    for(auto &con : consumers_)
+    {
+      con->onTimeout();
+    }
+  }
 
   bool consume(shared_ptr<T> product)
   {
@@ -93,6 +103,8 @@ template <typename T>
 class Pipeline
 {
 private:
+  typedef std::chrono::high_resolution_clock Clock;
+  typedef Clock::time_point Time;
   IProducer<T>& producer_;
   IConsumer<T>& consumer_;
   BlockingReaderWriterQueue<unique_ptr<T>> queue_;
@@ -129,6 +141,8 @@ private:
   {
     consumer_.setupConsumer();
     unique_ptr<T> product;
+    Time last_pkg = Clock::now();
+    Time last_warn = last_pkg;
     while (running_)
     {
       // 16000us timeout was chosen because we should
@@ -136,8 +150,18 @@ private:
       // 8ms so double it for some error margin
       if (!queue_.wait_dequeue_timed(product, std::chrono::milliseconds(16)))
       {
+        Time now = Clock::now();
+        auto pkg_diff = now - last_pkg;
+        auto warn_diff = now - last_warn;
+        if(pkg_diff > std::chrono::seconds(1) && warn_diff > std::chrono::seconds(1))
+        {
+          last_warn = now;
+          consumer_.onTimeout();
+        }
         continue;
       }
+
+      last_pkg = Clock::now();
       if (!consumer_.consume(std::move(product)))
         break;
     }

include/ur_modern_driver/ros/action_server.h

@@ -5,6 +5,7 @@
 #include <condition_variable>
 #include <mutex>
 #include <set>
+#include <thread>
 #include <ros/ros.h>
 #include <actionlib/server/action_server.h>
 #include <actionlib/server/server_goal_handle.h>
@@ -17,7 +18,7 @@
 #include "ur_modern_driver/ros/trajectory_follower.h"
 
 
-class ActionServer : public URRTPacketConsumer, public Service
+class ActionServer : public Service //,public URRTPacketConsumer
 {
 private:
   typedef control_msgs::FollowJointTrajectoryAction Action;
@@ -35,9 +36,11 @@ private:
 
   
   GoalHandle curr_gh_;
+  std::atomic<bool> interrupt_traj_;
   std::atomic<bool> has_goal_, running_;
   std::mutex tj_mutex_;
   std::condition_variable tj_cv_;
+  std::thread tj_thread_;
 
   TrajectoryFollower& follower_;
 
@@ -50,20 +53,16 @@ private:
   bool validateTrajectory(GoalHandle& gh, Result& res);
 
   bool try_execute(GoalHandle& gh, Result& res);
+  void interruptGoal(GoalHandle& gh);
 
   std::vector<size_t> reorderMap(std::vector<std::string> goal_joints);
-  double interp_cubic(double t, double T, double p0_pos, double p1_pos, double p0_vel, double p1_vel);
 
   void trajectoryThread();
 
-  template <typename U>
-  double toSec(U const& u)
-  {
-      return std::chrono::duration_cast<std::chrono::duration<double>>(u).count();
-  }
 
 public:
   ActionServer(TrajectoryFollower& follower, std::vector<std::string>& joint_names, double max_velocity);
 
+  void start();
   virtual void onRobotStateChange(RobotState state);
 };

include/ur_modern_driver/ros/controller.h

@@ -34,6 +34,7 @@ private:
   std::map<std::string, HardwareInterface*> available_interfaces_;
 
   std::atomic<bool> service_enabled_;
+  std::atomic<uint32_t> service_cooldown_;
 
   // helper functions to map interfaces
   template <typename T>
@@ -51,6 +52,7 @@ private:
   void read(RTShared& state);
   bool update(RTShared& state);
   bool write();
+  void reset();
 
 public:
   ROSController(URCommander& commander,  std::vector<std::string>& joint_names, double max_vel_change);

include/ur_modern_driver/ros/hardware_interface.h

@@ -13,6 +13,7 @@ public:
   virtual bool write() = 0;
   virtual void start() {}
   virtual void stop() {}
+  virtual void reset() {}
 };
 
 using hardware_interface::JointHandle;
@@ -48,6 +49,7 @@ private:
 public:
   VelocityInterface(URCommander &commander, hardware_interface::JointStateInterface &js_interface, std::vector<std::string> &joint_names, double max_vel_change);
   virtual bool write();
+  virtual void reset();
   typedef hardware_interface::VelocityJointInterface parent_type;
 };
 

include/ur_modern_driver/ros/io_service.h

@@ -37,6 +37,8 @@ private:
       case ur_msgs::SetIO::Request::FUN_SET_FLAG:
         res = commander_.setFlag(req.pin, flag);
       break;
+      default:
+        LOG_WARN("Invalid setIO function called (%d)", req.fun);
     }
 
     return (resp.success = res);

include/ur_modern_driver/ros/trajectory_follower.h

@@ -5,21 +5,39 @@
 #include <cstddef>
 #include <cstring>
 #include <string>
+#include <thread>
 #include <inttypes.h>
+#include "ur_modern_driver/log.h"
 #include "ur_modern_driver/ur/commander.h"
 #include "ur_modern_driver/ur/server.h"
-#include "ur_modern_driver/ur/stream.h"
+
+struct TrajectoryPoint
+{
+  std::array<double, 6> positions;
+  std::array<double, 6> velocities;
+  std::chrono::microseconds time_from_start;
+
+  TrajectoryPoint()
+  {
+  }
+
+  TrajectoryPoint(std::array<double, 6> &pos, std::array<double, 6> &vel, std::chrono::microseconds tfs)
+    : positions(pos)
+    , velocities(vel)
+    , time_from_start(tfs)
+  {
+  }
+};
 
 class TrajectoryFollower 
 {
 private:
-  const int32_t MULT_JOINTSTATE_ = 1000000;
   double servoj_time_, servoj_lookahead_time_, servoj_gain_;
   std::atomic<bool> running_;
   std::array<double, 6> last_positions_;
   URCommander &commander_;
   URServer server_;
-  URStream stream_;
+  int reverse_port_;
   std::string program_;
 
   template <typename T>
@@ -30,15 +48,16 @@ private:
     return s;
   }
 
+  std::string buildProgram();
   bool execute(std::array<double, 6> &positions, bool keep_alive);  
+  double interpolate(double t, double T, double p0_pos, double p1_pos, double p0_vel, double p1_vel); 
 
 public:
   TrajectoryFollower(URCommander &commander, int reverse_port, bool version_3);
 
-  std::string buildProgram(bool version_3);
-
   bool start();
   bool execute(std::array<double, 6> &positions);
+  bool execute(std::vector<TrajectoryPoint> &trajectory, std::atomic<bool> &interrupt);
   void stop();
-  void halt(); //maybe
+  void interrupt();
 };

include/ur_modern_driver/tcp_socket.h

@@ -0,0 +1,45 @@
+#pragma once 
+#include <netdb.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <mutex>
+#include <atomic>
+#include <string>
+
+enum class SocketState
+{
+  Invalid,
+  Connected,
+  Disconnected,
+  Closed
+};
+
+class TCPSocket
+{
+private:
+  std::atomic<int> socket_fd_;
+  std::atomic<SocketState> state_;
+
+protected:
+  virtual bool open(int socket_fd, struct sockaddr *address, size_t address_len)
+  {
+    return false;
+  }
+  
+  
+  bool setup(std::string &host, int port);
+  void close();
+
+
+public:
+  TCPSocket();
+  virtual ~TCPSocket();
+
+  SocketState getState() { return state_; }
+  
+  int getSocketFD() { return socket_fd_; }
+  bool setSocketFD(int socket_fd);
+
+  bool read(uint8_t* buf, size_t buf_len, size_t &read);
+  bool write(const uint8_t* buf, size_t buf_len, size_t &written);
+};

include/ur_modern_driver/ur/commander.h

@@ -11,18 +11,46 @@ private:
 
 protected:
   bool write(std::string& s);
+  void formatArray(std::ostringstream &out, std::array<double, 6> &values);
 
 public:
   URCommander(URStream& stream) : stream_(stream)
   {
   }
 
-  virtual bool uploadProg(std::string &s);
+  virtual bool speedj(std::array<double, 6> &speeds, double acceleration) = 0;
+  virtual bool setDigitalOut(uint8_t pin, bool value) = 0;
+  virtual bool setAnalogOut(uint8_t pin, double value) = 0;
+
+  //shared
+  bool uploadProg(std::string &s);
+  bool stopj(double a = 10.0);
+  bool setToolVoltage(uint8_t voltage);
+  bool setFlag(uint8_t pin, bool value);
+  bool setPayload(double value);
+};
+
+class URCommander_V1_X : public URCommander
+{
+public:
+  URCommander_V1_X(URStream& stream) : URCommander(stream)
+  {
+  }
+
+  virtual bool speedj(std::array<double, 6> &speeds, double acceleration);
+  virtual bool setDigitalOut(uint8_t pin, bool value);
+  virtual bool setAnalogOut(uint8_t pin, double value);
+};
+
+
+class URCommander_V3_X : public URCommander
+{
+public:
+  URCommander_V3_X(URStream& stream) : URCommander(stream)
+  {
+  }
+
   virtual bool speedj(std::array<double, 6> &speeds, double acceleration);
-  virtual bool stopj(double a = 10.0);
   virtual bool setDigitalOut(uint8_t pin, bool value);
   virtual bool setAnalogOut(uint8_t pin, double value);
-  virtual bool setToolVoltage(uint8_t voltage);
-  virtual bool setFlag(uint8_t pin, bool value);
-  virtual bool setPayload(double value);
 };

include/ur_modern_driver/ur/factory.h

@@ -71,6 +71,19 @@ public:
     prod.teardownProducer();
   }
 
+  bool isVersion3()
+  {
+    return major_version_ == 3;
+  }
+
+  std::unique_ptr<URCommander> getCommander(URStream &stream)
+  {
+    if(major_version_ == 1)
+      return std::unique_ptr<URCommander>(new URCommander_V1_X(stream));
+    else
+      return std::unique_ptr<URCommander>(new URCommander_V3_X(stream));    
+  }
+
   std::unique_ptr<URParser<StatePacket>> getStateParser()
   {
     if (major_version_ == 1)

include/ur_modern_driver/ur/producer.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <chrono>
 #include "ur_modern_driver/pipeline.h"
 #include "ur_modern_driver/ur/parser.h"
 #include "ur_modern_driver/ur/stream.h"
@@ -9,9 +10,10 @@ class URProducer : public IProducer<T>
 private:
   URStream& stream_;
   URParser<T>& parser_;
+  std::chrono::seconds timeout_;
 
 public:
-  URProducer(URStream& stream, URParser<T>& parser) : stream_(stream), parser_(parser)
+  URProducer(URStream& stream, URParser<T>& parser) : stream_(stream), parser_(parser), timeout_(1)
   {
   }
 
@@ -32,24 +34,29 @@ public:
   {
     // 4KB should be enough to hold any packet received from UR
     uint8_t buf[4096];
-
-    // blocking call
-    ssize_t len = stream_.receive(buf, sizeof(buf));
-
-    // LOG_DEBUG("Read %d bytes from stream", len);
-
-    if (len == 0)
+    size_t read = 0;
+    //expoential backoff reconnects
+    while(true)
     {
-      LOG_WARN("Read nothing from stream");
-      return false;
-    }
-    else if (len < 0)
-    {
-      LOG_WARN("Stream closed");
-      return false;
+      if(stream_.read(buf, sizeof(buf), read))
+      {
+        //reset sleep amount
+        timeout_ = std::chrono::seconds(1);
+        break;
+      }
+
+      if(stream_.closed())
+        return false;
+
+      LOG_WARN("Failed to read from stream, reconnecting in %ld seconds...", timeout_.count());
+      std::this_thread::sleep_for(timeout_);
+      auto next = timeout_ * 2;
+      if(next <= std::chrono::seconds(120))
+        timeout_ = next;
     }
 
-    BinParser bp(buf, static_cast<size_t>(len));
+
+    BinParser bp(buf, read);
     return parser_.parse(bp, products);
   }
 };

include/ur_modern_driver/ur/server.h

@@ -6,14 +6,25 @@
 #include <mutex>
 #include <atomic>
 #include <string>
-#include "ur_modern_driver/ur/stream.h"
+#include "ur_modern_driver/tcp_socket.h"
 
-class URServer
+class URServer : private TCPSocket
 {
 private:
-  int socket_fd_ = -1;
+  int port_;
+  SocketState state_;
+  TCPSocket client_;
+
+protected:
+  virtual bool open(int socket_fd, struct sockaddr *address, size_t address_len)
+  {
+    return ::bind(socket_fd, address, address_len) == 0;
+  }
 
 public:
   URServer(int port);
-  URStream accept();
+  std::string getIP();
+  bool bind();
+  bool accept();
+  bool write(const uint8_t* buf, size_t buf_len, size_t &written);
 };

include/ur_modern_driver/ur/stream.h

@@ -5,56 +5,39 @@
 #include <mutex>
 #include <atomic>
 #include <string>
+#include "ur_modern_driver/log.h"
+#include "ur_modern_driver/tcp_socket.h"
 
-/// Encapsulates a TCP socket
-class URStream
+class URStream : private TCPSocket
 {
 private:
-  int socket_fd_ = -1;
   std::string host_;
   int port_;
+  std::mutex write_mutex_, read_mutex_;
 
-  std::atomic<bool> initialized_;
-  std::atomic<bool> stopping_;
-  std::mutex send_mutex_, receive_mutex_;
+protected:
+  virtual bool open(int socket_fd, struct sockaddr *address, size_t address_len)
+  {
+    return ::connect(socket_fd, address, address_len) == 0;
+  }
 
 public:
-  URStream() 
+  URStream(std::string& host, int port) : host_(host), port_(port)
   {
   }
 
-  URStream(std::string& host, int port) : host_(host), port_(port), initialized_(false), stopping_(false)
+  bool connect()
   {
+    return TCPSocket::setup(host_, port_);
+  }
+  void disconnect()
+  {
+    LOG_INFO("Disconnecting");
+    TCPSocket::close();
   }
 
-  URStream(int socket_fd) : socket_fd_(socket_fd), initialized_(true), stopping_(false)
-  {
+  bool closed() { return getState() == SocketState::Closed; }
 
-  }
-
-  URStream(URStream&& other) noexcept : socket_fd_(other.socket_fd_), host_(other.host_), initialized_(other.initialized_.load()), stopping_(other.stopping_.load())
-  {
-    
-  }
-
-  ~URStream()
-  {
-    disconnect();
-  }
-
-  URStream& operator=(URStream&& other)
-  {
-    socket_fd_ = std::move(other.socket_fd_);
-    host_ = std::move(other.host_); 
-    initialized_ = std::move(other.initialized_.load());
-    stopping_ = std::move(other.stopping_.load());
-    return *this;
-  }
-
-  bool connect();
-  void disconnect();
-  void reconnect();
-
-  ssize_t send(const uint8_t* buf, size_t buf_len);
-  ssize_t receive(uint8_t* buf, size_t buf_len);
+  bool read(uint8_t* buf, size_t buf_len, size_t &read);
+  bool write(const uint8_t* buf, size_t buf_len, size_t &written);
 };

src/ros/action_server.cpp

@@ -15,7 +15,14 @@ ActionServer::ActionServer(TrajectoryFollower& follower, std::vector<std::string
   , state_(RobotState::Error)
   , follower_(follower)
 {
+}
 
+void ActionServer::start()
+{
+  if(running_)
+    return;
+  running_ = true;
+  tj_thread_ = thread(&ActionServer::trajectoryThread, this);
 }
 
 void ActionServer::onRobotStateChange(RobotState state)
@@ -34,7 +41,14 @@ void ActionServer::onGoal(GoalHandle gh)
 
 void ActionServer::onCancel(GoalHandle gh)
 {
+  interrupt_traj_ = true;
+  //wait for goal to be interrupted
+  std::lock_guard<std::mutex> lock(tj_mutex_);
 
+  Result res;
+  res.error_code = -100;
+  res.error_string = "Goal cancelled by client";
+  gh.setCanceled(res);
 }
 
 bool ActionServer::validate(GoalHandle& gh, Result& res)
@@ -125,9 +139,17 @@ bool ActionServer::validateTrajectory(GoalHandle& gh, Result& res)
     }
   }
 
+  //todo validate start position?
+
   return true;
 }
 
+inline std::chrono::microseconds convert(const ros::Duration &dur)
+{
+  return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::seconds(dur.sec)) 
+    + std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::nanoseconds(dur.nsec));
+}
+
 bool ActionServer::try_execute(GoalHandle& gh, Result& res)
 {
   if(!running_)
@@ -137,27 +159,20 @@ bool ActionServer::try_execute(GoalHandle& gh, Result& res)
   }
   if(!tj_mutex_.try_lock())
   {
-    has_goal_ = false;
-    //stop_trajectory();
+    interrupt_traj_ = true;
     res.error_string = "Received another trajectory";
     curr_gh_.setAborted(res, res.error_string);
     tj_mutex_.lock();
+    //todo: make configurable
+    std::this_thread::sleep_for(std::chrono::milliseconds(250));
   }
   //locked here
   curr_gh_ = gh;
+  interrupt_traj_ = false;
   has_goal_ = true;
   tj_mutex_.unlock();
   tj_cv_.notify_one();
-}
-
-inline double ActionServer::interp_cubic(double t, double T, double p0_pos, double p1_pos, double p0_vel, double p1_vel)
-{
-  using std::pow;
-  double a = p0_pos;
-  double b = p0_vel;
-  double c = (-3 * a + 3 * p1_pos - 2 * T * b - T * p1_vel) / pow(T, 2);
-  double d = (2 * a - 2 * p1_pos + T * b + T * p1_vel) / pow(T, 3);
-  return a + b * t + c * pow(t, 2) + d * pow(t, 3);
+  return true;
 }
 
 std::vector<size_t> ActionServer::reorderMap(std::vector<std::string> goal_joints)
@@ -179,53 +194,56 @@ std::vector<size_t> ActionServer::reorderMap(std::vector<std::string> goal_joint
 
 void ActionServer::trajectoryThread()
 {
+  follower_.start(); //todo check error
+  //as_.start();
   while(running_)
   {
     std::unique_lock<std::mutex> lk(tj_mutex_);
     if(!tj_cv_.wait_for(lk, std::chrono::milliseconds(100), [&]{return running_ && has_goal_;}))
       continue;
     
-    auto g = curr_gh_.getGoal();
-    auto const& traj = g->trajectory;
-    auto const& points = traj.points;
-    size_t len = points.size();
-    auto const& last_point = points[points.size() - 1];
-    double end_time = last_point.time_from_start.toSec();
+    LOG_DEBUG("Trajectory received and accepted");
+    curr_gh_.setAccepted();
 
-    auto mapping = reorderMap(traj.joint_names);
-    std::chrono::high_resolution_clock::time_point t0, t;
-    t = t0 = std::chrono::high_resolution_clock::now();
+    auto goal = curr_gh_.getGoal();
+    auto mapping = reorderMap(goal->trajectory.joint_names);
+    std::vector<TrajectoryPoint> trajectory(goal->trajectory.points.size());
     
-    size_t i = 0;
-    while(end_time >= toSec(t - t0) && has_goal_)
+    for(auto const& point : goal->trajectory.points)
     {
-      while(points[i].time_from_start.toSec() <= toSec(t - t0) && i < len)
-        i++;
-      
-      auto const& pp = points[i-1];
-      auto const& p = points[i];
-
-      auto pp_t = pp.time_from_start.toSec();
-      auto p_t =p.time_from_start.toSec();
-
-      std::array<double, 6> pos;
-      for(size_t j = 0; j < pos.size(); j++)
+      std::array<double, 6> pos, vel;
+      for(size_t i = 0; i < 6; i++)
       {
-        pos[i] = interp_cubic(
-          toSec(t - t0) - pp_t,
-          p_t - pp_t,
-          pp.positions[j],
-          p.positions[j],
-          pp.velocities[j],
-          p.velocities[j]
-        );
+        //joint names of the goal might have a different ordering compared
+        //to what URScript expects so need to map between the two
+        size_t idx = mapping[i];
+        pos[idx] = point.positions[i];
+        vel[idx] = point.velocities[i];
       }
+      trajectory.push_back(TrajectoryPoint(pos, vel, convert(point.time_from_start)));
+    }
 
-      follower_.execute(pos);
-      //std::this_thread::sleep_for(std::chrono::milliseconds((int)((servoj_time_ * 1000) / 4.))); 
-      t = std::chrono::high_resolution_clock::now();
+    Result res;
+    if(follower_.execute(trajectory, interrupt_traj_))
+    {
+      //interrupted goals must be handled by interrupt trigger
+      if(!interrupt_traj_)
+      {
+        LOG_DEBUG("Trajectory executed successfully");
+        res.error_code = Result::SUCCESSFUL;
+        curr_gh_.setSucceeded(res);
+      }
+    }
+    else
+    {
+      LOG_DEBUG("Trajectory failed");
+      res.error_code = -100;
+      res.error_string = "Connection to robot was lost";      
+      curr_gh_.setAborted(res, res.error_string);
     }
 
     has_goal_ = false;
+    lk.unlock();
   }
+  follower_.stop();
 }

src/ros/controller.cpp

@@ -20,6 +20,8 @@ void ROSController::setupConsumer()
 
 void ROSController::doSwitch(const std::list<hardware_interface::ControllerInfo>& start_list, const std::list<hardware_interface::ControllerInfo>& stop_list)
 {
+  LOG_INFO("Switching hardware interface");
+
   if (active_interface_ != nullptr && stop_list.size() > 0)
   {
     LOG_INFO("Stopping active interface");
@@ -54,6 +56,14 @@ bool ROSController::write()
   return active_interface_->write();
 }
 
+void ROSController::reset()
+{
+  if (active_interface_ == nullptr)
+    return;
+  
+  active_interface_->reset();
+}
+
 void ROSController::read(RTShared& packet)
 {
   joint_interface_.update(packet);
@@ -68,17 +78,32 @@ bool ROSController::update(RTShared& state)
   lastUpdate_ = time;
 
   read(state);
-  controller_.update(time, diff);
+  controller_.update(time, diff, !service_enabled_);
 
   //emergency stop and such should not kill the pipeline
   //but still prevent writes
   if(!service_enabled_)
+  {
+    reset();
     return true;
+  }
+  
+  //allow the controller to update x times before allowing writes again
+  if(service_cooldown_ > 0)
+  {
+    service_cooldown_ -= 1;
+    return true;
+  }
 
   return write();
 }
 
 void ROSController::onRobotStateChange(RobotState state)
 {
-  service_enabled_ = (state == RobotState::Running);
+  bool next = (state == RobotState::Running);
+  if(next == service_enabled_)
+    return;
+  
+  service_enabled_ = next;
+  service_cooldown_ = 125; 
 }

src/ros/hardware_interface.cpp

@@ -1,61 +1,69 @@
 #include "ur_modern_driver/ros/hardware_interface.h"
+#include "ur_modern_driver/log.h"
 
 JointInterface::JointInterface(std::vector<std::string> &joint_names)
 {
-    for (size_t i = 0; i < 6; i++)
-    {
-        registerHandle(hardware_interface::JointStateHandle(joint_names[i], &positions_[i], &velocities_[i], &efforts_[i]));
-    }
+  for (size_t i = 0; i < 6; i++)
+  {
+    registerHandle(hardware_interface::JointStateHandle(joint_names[i], &positions_[i], &velocities_[i], &efforts_[i]));
+  }
 }
 
 void JointInterface::update(RTShared &packet)
 {
-    positions_ = packet.q_actual;
-    velocities_ = packet.qd_actual;
-    efforts_ = packet.i_actual;
+  positions_ = packet.q_actual;
+  velocities_ = packet.qd_actual;
+  efforts_ = packet.i_actual;
 }
 
 WrenchInterface::WrenchInterface()
 {
-    registerHandle(hardware_interface::ForceTorqueSensorHandle("wrench", "", tcp_.begin(), tcp_.begin() + 3));
+  registerHandle(hardware_interface::ForceTorqueSensorHandle("wrench", "", tcp_.begin(), tcp_.begin() + 3));
 } 
 
 void WrenchInterface::update(RTShared &packet)
 {
-    tcp_ = packet.tcp_force;
+  tcp_ = packet.tcp_force;
 }
 
 VelocityInterface::VelocityInterface(URCommander &commander, hardware_interface::JointStateInterface &js_interface, std::vector<std::string> &joint_names, double max_vel_change)
-    : commander_(commander), max_vel_change_(max_vel_change)
+  : commander_(commander), max_vel_change_(max_vel_change)
 {
-    for (size_t i = 0; i < 6; i++)
-    {
-        registerHandle(JointHandle(js_interface.getHandle(joint_names[i]), &velocity_cmd_[i]));
-    }
+  for (size_t i = 0; i < 6; i++)
+  {
+    registerHandle(JointHandle(js_interface.getHandle(joint_names[i]), &velocity_cmd_[i]));
+  }
 }
 
 bool VelocityInterface::write()
 {
-    for (size_t i = 0; i < 6; i++)
-    {
-        double prev = prev_velocity_cmd_[i];
-        double lo = prev - max_vel_change_;
-        double hi = prev + max_vel_change_;
-        // clamp value to ±max_vel_change
-        prev_velocity_cmd_[i] = std::max(lo, std::min(velocity_cmd_[i], hi));
-    }
+  for (size_t i = 0; i < 6; i++)
+  {
+    // clamp value to ±max_vel_change
+    double prev = prev_velocity_cmd_[i];
+    double lo = prev - max_vel_change_;
+    double hi = prev + max_vel_change_;
+    prev_velocity_cmd_[i] = std::max(lo, std::min(velocity_cmd_[i], hi));
+  }
+  return commander_.speedj(prev_velocity_cmd_, max_vel_change_);
+}
 
-    return commander_.speedj(prev_velocity_cmd_, max_vel_change_);
+void VelocityInterface::reset()
+{
+  for(auto &val : prev_velocity_cmd_)
+  {
+    val = 0;
+  }
 }
 
 
 PositionInterface::  PositionInterface(URCommander &commander, hardware_interface::JointStateInterface &js_interface, std::vector<std::string> &joint_names)
-    : commander_(commander)
+  : commander_(commander)
 {
-    for (size_t i = 0; i < 6; i++)
-    {
-        registerHandle(JointHandle(js_interface.getHandle(joint_names[i]), &position_cmd_[i]));
-    }
+  for (size_t i = 0; i < 6; i++)
+  {
+    registerHandle(JointHandle(js_interface.getHandle(joint_names[i]), &position_cmd_[i]));
+  }
 }
 
 bool PositionInterface::write()

src/ros/trajectory_follower.cpp

@@ -2,82 +2,95 @@
 #include "ur_modern_driver/ros/trajectory_follower.h"
   
   
-TrajectoryFollower::TrajectoryFollower(URCommander &commander, int reverse_port, bool version_3)
-  : running_(false)
-  , commander_(commander)
-  , server_(reverse_port)
-  , program_(buildProgram(version_3))
-{
-}
+static const int32_t MULT_JOINTSTATE_ = 1000000;
 static const std::string JOINT_STATE_REPLACE("{{JOINT_STATE_REPLACE}}");
 static const std::string SERVO_J_REPLACE("{{SERVO_J_REPLACE}}");
+static const std::string SERVER_IP_REPLACE("{{SERVER_IP_REPLACE}}");
+static const std::string SERVER_PORT_REPLACE("{{SERVER_PORT_REPLACE}}");
 static const std::string POSITION_PROGRAM = R"(
 def driverProg():
-    MULT_jointstate = {{JOINT_STATE_REPLACE}}
+	MULT_jointstate = {{JOINT_STATE_REPLACE}}
 
-    SERVO_IDLE = 0
-    SERVO_RUNNING = 1
-    cmd_servo_state = SERVO_IDLE
-    cmd_servo_q = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
-    def set_servo_setpoint(q):
-        enter_critical
-        cmd_servo_state = SERVO_RUNNING
-        cmd_servo_q = q
-        exit_critical
-    end
-    thread servoThread():
-        state = SERVO_IDLE
-        while True:
-            enter_critical
-            q = cmd_servo_q
-            do_brake = False
-            if (state == SERVO_RUNNING) and (cmd_servo_state == SERVO_IDLE):
-                do_brake = True
-            end
-            state = cmd_servo_state
-            cmd_servo_state = SERVO_IDLE
-            exit_critical
-            if do_brake:
-                stopj(1.0)
-                sync()
-            elif state == SERVO_RUNNING:
-                servoj(q, {{SERVO_J_REPLACE}})
-            else:
-                sync()
-            end
-        end
-    end
+	SERVO_IDLE = 0
+	SERVO_RUNNING = 1
+	cmd_servo_state = SERVO_IDLE
+	cmd_servo_q = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+	
+	def set_servo_setpoint(q):
+		enter_critical
+		cmd_servo_state = SERVO_RUNNING
+		cmd_servo_q = q
+		exit_critical
+	end
+	
+	thread servoThread():
+		state = SERVO_IDLE
+		while True:
+			enter_critical
+			q = cmd_servo_q
+			do_brake = False
+			if (state == SERVO_RUNNING) and (cmd_servo_state == SERVO_IDLE):
+				do_brake = True
+			end
+			state = cmd_servo_state
+			cmd_servo_state = SERVO_IDLE
+			exit_critical
+			if do_brake:
+				stopj(1.0)
+				sync()
+			elif state == SERVO_RUNNING:
+				servoj(q, {{SERVO_J_REPLACE}})
+			else:
+				sync()
+			end
+		end
+	end
+
+  socket_open(\"{{SERVER_IP_REPLACE}}\", {{SERVER_PORT_REPLACE}})
 
   thread_servo = run servoThread()
   keepalive = 1
   while keepalive > 0:
-      params_mult = socket_read_binary_integer(6+1)
-      if params_mult[0] > 0:
-          q = [params_mult[1] / MULT_jointstate, params_mult[2] / MULT_jointstate, params_mult[3] / MULT_jointstate, params_mult[4] / MULT_jointstate, params_mult[5] / MULT_jointstate, params_mult[6] / MULT_jointstate]
-          keepalive = params_mult[7]
-          set_servo_setpoint(q)
-      end
+	  params_mult = socket_read_binary_integer(6+1)
+	  if params_mult[0] > 0:
+		  q = [params_mult[1] / MULT_jointstate, params_mult[2] / MULT_jointstate, params_mult[3] / MULT_jointstate, params_mult[4] / MULT_jointstate, params_mult[5] / MULT_jointstate, params_mult[6] / MULT_jointstate]
+		  keepalive = params_mult[7]
+		  set_servo_setpoint(q)
+	  end
   end
   sleep(.1)
   socket_close()
   kill thread_servo
 end
 )";
-std::string TrajectoryFollower::buildProgram(bool version_3)
+
+TrajectoryFollower::TrajectoryFollower(URCommander &commander, int reverse_port, bool version_3)
+  : running_(false)
+  , commander_(commander)
+  , reverse_port_(reverse_port)
+  , server_(reverse_port)
 {
   std::string res(POSITION_PROGRAM);
-  size_t js_idx = POSITION_PROGRAM.find(JOINT_STATE_REPLACE);
-  size_t sj_idx = POSITION_PROGRAM.find(SERVO_J_REPLACE);
 
+  res.replace(res.find(JOINT_STATE_REPLACE), JOINT_STATE_REPLACE.length(), std::to_string(MULT_JOINTSTATE_));
 
   std::ostringstream out;
   out << "t=" << std::fixed << std::setprecision(4) << servoj_time_;
-  
   if(version_3)
     out << ", lookahead_time=" << servoj_lookahead_time_ << ", gain=" << servoj_gain_;
 
-  res.replace(js_idx, JOINT_STATE_REPLACE.length(), std::to_string(MULT_JOINTSTATE_));
-  res.replace(sj_idx, SERVO_J_REPLACE.length(), out.str());
+  res.replace(res.find(SERVO_J_REPLACE), SERVO_J_REPLACE.length(), out.str());
+
+  program_ = res;
+}
+
+std::string TrajectoryFollower::buildProgram()
+{
+  std::string res(program_);
+  std::string IP(server_.getIP());
+  LOG_INFO("Local IP: %s  ", IP.c_str());
+  res.replace(res.find(SERVER_IP_REPLACE), SERVER_IP_REPLACE.length(), "127.0.0.1");
+  res.replace(res.find(SERVER_PORT_REPLACE), SERVER_PORT_REPLACE.length(), std::to_string(reverse_port_));
   return res;
 }
 
@@ -86,12 +99,31 @@ bool TrajectoryFollower::start()
   if(running_)
     return true; //not sure
 
-  //TODO
-  std::string prog(""); // buildProg();
-  if(!commander_.uploadProg(prog))
+  if(!server_.bind())
+  {
+    LOG_ERROR("Failed to bind server");
     return false;
+  }
 
-  stream_ = std::move(server_.accept()); //todo: pointer instead?
+  LOG_INFO("Uploading trajectory program to robot");
+
+  std::string prog(buildProgram());
+  //std::string prog = "socket_open(\"127.0.0.1\", 50001)\n";
+  if(!commander_.uploadProg(prog))
+  {
+    LOG_ERROR("Program upload failed!");
+    return false;
+  }
+
+  LOG_INFO("Awaiting incomming robot connection");
+
+  if(!server_.accept())
+  {
+    LOG_ERROR("Failed to accept incomming robot connection");
+    return false;
+  }
+  
+  LOG_INFO("Robot successfully connected");
   return (running_ = true);
 }
 
@@ -115,8 +147,18 @@ bool TrajectoryFollower::execute(std::array<double, 6> &positions, bool keep_ali
   int32_t val = htobe32(static_cast<int32_t>(keep_alive));
   append(idx, val);
 
-  ssize_t res = stream_.send(buf, sizeof(buf));
-  return res > 0 && res == sizeof(buf);
+  size_t written; 
+  return server_.write(buf, sizeof(buf), written);
+}
+
+double TrajectoryFollower::interpolate(double t, double T, double p0_pos, double p1_pos, double p0_vel, double p1_vel)
+{
+  using std::pow;
+  double a = p0_pos;
+  double b = p0_vel;
+  double c = (-3 * a + 3 * p1_pos - 2 * T * b - T * p1_vel) / pow(T, 2);
+  double d = (2 * a - 2 * p1_pos + T * b + T * p1_vel) / pow(T, 3);
+  return a + b * t + c * pow(t, 2) + d * pow(t, 3);
 }
 
 bool TrajectoryFollower::execute(std::array<double, 6> &positions)
@@ -124,6 +166,68 @@ bool TrajectoryFollower::execute(std::array<double, 6> &positions)
   return execute(positions, true);
 }
 
+bool TrajectoryFollower::execute(std::vector<TrajectoryPoint> &trajectory, std::atomic<bool> &interrupt)
+{
+  if(!running_)
+    return false;
+  
+  using namespace std::chrono;
+  typedef duration<double> double_seconds;
+  typedef high_resolution_clock Clock;
+  typedef Clock::time_point Time;
+
+  auto const& last = trajectory[trajectory.size()-1];
+  auto& prev = trajectory[0];
+
+  Time t0 = Clock::now();
+  Time latest = t0;
+
+  std::array<double, 6> positions;
+
+  for(auto const& point : trajectory)
+  {
+    //skip t0
+    if(&point == &prev)
+      continue;
+
+    auto duration = point.time_from_start - prev.time_from_start;
+    double d_s = duration_cast<double_seconds>(duration).count();
+
+    //interpolation loop
+    while(!interrupt)
+    {
+      latest = Clock::now();
+      auto elapsed = latest - t0;
+
+      if(point.time_from_start <= elapsed || last.time_from_start >= elapsed)
+        break;
+
+      double elapsed_s = duration_cast<double_seconds>(elapsed - prev.time_from_start).count();
+      //double prev_seconds
+      for(size_t j = 0; j < positions.size(); j++)
+      {
+        positions[j] = interpolate(
+          elapsed_s, 
+          d_s, 
+          prev.positions[j], 
+          point.positions[j],
+          prev.velocities[j],
+          point.velocities[j]
+        );
+      }
+
+      if(!execute(positions, true))
+        return false;
+
+      std::this_thread::sleep_for(double_seconds(servoj_time_));
+    }
+
+    prev = point;
+  }
+
+  return true;
+}
+
 void TrajectoryFollower::stop()
 {
   if(!running_)
@@ -132,6 +236,6 @@ void TrajectoryFollower::stop()
   std::array<double, 6> empty;
   execute(empty, false);
 
-  stream_.disconnect();
+  //server_.disconnect();
   running_ = false;
 }

src/ros_main.cpp

@@ -6,10 +6,12 @@
 
 #include "ur_modern_driver/log.h"
 #include "ur_modern_driver/pipeline.h"
+#include "ur_modern_driver/ros/action_server.h"
+#include "ur_modern_driver/ros/controller.h"
 #include "ur_modern_driver/ros/io_service.h"
 #include "ur_modern_driver/ros/mb_publisher.h"
-#include "ur_modern_driver/ros/controller.h"
 #include "ur_modern_driver/ros/rt_publisher.h"
+#include "ur_modern_driver/ros/trajectory_follower.h"
 #include "ur_modern_driver/ros/service_stopper.h"
 #include "ur_modern_driver/ur/commander.h"
 #include "ur_modern_driver/ur/factory.h"
@@ -63,7 +65,7 @@ bool parse_args(ProgArgs &args)
   return true;
 }
 
-#include "ur_modern_driver/event_counter.h"
+#include "ur_modern_driver/ur/server.h"
 
 int main(int argc, char **argv)
 {
@@ -75,6 +77,7 @@ int main(int argc, char **argv)
     return EXIT_FAILURE;
   }
 
+
   URFactory factory(args.host);
 
   vector<Service*> services;
@@ -84,17 +87,27 @@ int main(int argc, char **argv)
   URStream rt_stream(args.host, UR_RT_PORT);
   URProducer<RTPacket> rt_prod(rt_stream, *rt_parser);
   RTPublisher rt_pub(args.prefix, args.base_frame, args.tool_frame, args.use_ros_control);
-  URCommander rt_commander(rt_stream);
+  auto rt_commander = factory.getCommander(rt_stream);
   vector<IConsumer<RTPacket> *> rt_vec{&rt_pub};
 
+  TrajectoryFollower traj_follower(*rt_commander, args.reverse_port, factory.isVersion3());
+
   ROSController *controller(nullptr);
+  ActionServer *action_server(nullptr);
   if (args.use_ros_control)
   {
     LOG_INFO("ROS control enabled");
-    controller = new ROSController(rt_commander, args.joint_names, args.max_vel_change);
+    controller = new ROSController(*rt_commander, args.joint_names, args.max_vel_change);
     rt_vec.push_back(controller);
     services.push_back(controller);
   }
+  else
+  {
+    LOG_INFO("ActionServer enabled");
+    action_server = new ActionServer(traj_follower, args.joint_names, args.max_velocity);
+    //rt_vec.push_back(action_server);
+    services.push_back(action_server);
+  }
 
   MultiConsumer<RTPacket> rt_cons(rt_vec);
   Pipeline<RTPacket> rt_pl(rt_prod, rt_cons);
@@ -116,8 +129,11 @@ int main(int argc, char **argv)
   rt_pl.run();
   state_pl.run();
 
-  URCommander state_commander(state_stream);
-  IOService io_service(state_commander);
+  auto state_commander = factory.getCommander(state_stream);
+  IOService io_service(*state_commander);
+
+  if(action_server)
+    action_server->start();
 
   ros::spin();
 

src/tcp_socket.cpp

@@ -0,0 +1,133 @@
+#include <endian.h>
+#include <netinet/tcp.h>
+#include <unistd.h>
+#include <cstring>
+
+#include "ur_modern_driver/log.h"
+#include "ur_modern_driver/tcp_socket.h"
+
+TCPSocket::TCPSocket()
+  : socket_fd_(-1)
+  , state_(SocketState::Invalid)
+{ 
+}
+TCPSocket::~TCPSocket()
+{
+  close();
+}
+
+bool TCPSocket::setup(std::string &host, int port)
+{
+  if(state_ == SocketState::Connected)
+    return false;
+
+  LOG_INFO("Setting up connection: %s:%d", host.c_str(), port);
+
+  // gethostbyname() is deprecated so use getadderinfo() as described in:
+  // http://www.beej.us/guide/bgnet/output/html/multipage/syscalls.html#getaddrinfo
+
+  const char *host_name = host.empty() ? nullptr : host.c_str();
+  std::string service = std::to_string(port);
+  struct addrinfo hints, *result;
+  std::memset(&hints, 0, sizeof(hints));
+
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_flags = AI_PASSIVE;
+
+  if (getaddrinfo(host_name, service.c_str(), &hints, &result) != 0)
+  {
+    LOG_ERROR("Failed to get address for %s:%d", host.c_str(), port);
+    return false;
+  }
+
+  bool connected = false;
+  // loop through the list of addresses untill we find one that's connectable
+  for (struct addrinfo* p = result; p != nullptr; p = p->ai_next)
+  {
+    socket_fd_ = ::socket(p->ai_family, p->ai_socktype, p->ai_protocol);
+
+    if (socket_fd_ != -1 && open(socket_fd_, p->ai_addr, p->ai_addrlen)) 
+    {
+      connected = true;
+      break;
+    }
+  }
+
+  freeaddrinfo(result);
+  
+  if(!connected)
+  {
+    state_ = SocketState::Invalid;
+    LOG_ERROR("Connection setup failed for %s:%d", host.c_str(), port);
+  }
+  else
+  {
+    state_ = SocketState::Connected;
+    LOG_INFO("Connection established for %s:%d", host.c_str(), port);
+  }
+  return connected;
+}
+
+bool TCPSocket::setSocketFD(int socket_fd)
+{
+  if(state_ == SocketState::Connected)
+    return false;
+  socket_fd_ = socket_fd;
+  state_ = SocketState::Connected;
+  return true;
+}
+
+void TCPSocket::close()
+{
+  if(state_ != SocketState::Connected)
+    return;
+  state_ = SocketState::Closed;
+  ::shutdown(socket_fd_, SHUT_RDWR);
+  socket_fd_ = -1;
+}
+
+bool TCPSocket::read(uint8_t *buf, size_t buf_len, size_t &read)
+{
+  read = 0;
+
+  if(state_ != SocketState::Connected)
+    return false;
+    
+  ssize_t res = ::recv(socket_fd_, buf, buf_len, 0);
+
+  if(res == 0)
+  {
+    state_ = SocketState::Disconnected;
+    return false;
+  }
+  else if(res < 0)
+    return false;
+
+  read = static_cast<size_t>(res);
+  return true;
+}
+
+bool TCPSocket::write(const uint8_t *buf, size_t buf_len, size_t &written)
+{
+  written = 0;
+  
+  if(state_ != SocketState::Connected)
+    return false;
+
+  size_t remaining = buf_len;
+
+  // handle partial sends
+  while (written < buf_len)
+  {
+    ssize_t sent = ::send(socket_fd_, buf + written, remaining, 0);
+
+    if (sent <= 0)
+      return false;
+    
+    written += sent;
+    remaining -= sent;
+  }
+  
+  return true;
+}

src/ur/commander.cpp

@@ -3,10 +3,21 @@
 
 bool URCommander::write(std::string& s)
 {
-    size_t len = s.size();
-    const uint8_t* data = reinterpret_cast<const uint8_t*>(s.c_str());
-    ssize_t res = stream_.send(data, len);
-    return res > 0 && static_cast<size_t>(res) == len;
+  size_t len = s.size();
+  const uint8_t* data = reinterpret_cast<const uint8_t*>(s.c_str());
+  size_t written;
+  return stream_.write(data, len, written);
+}
+
+void URCommander::formatArray(std::ostringstream &out, std::array<double, 6> &values)
+{
+  std::string mod("[");
+  for(auto const& val : values)
+  {
+      out << mod << val;
+      mod = ",";
+  }
+  out << "]";
 }
 
 bool URCommander::uploadProg(std::string &s)
@@ -14,59 +25,110 @@ bool URCommander::uploadProg(std::string &s)
   return write(s);
 }
 
-bool URCommander::speedj(std::array<double, 6> &speeds, double acceleration)
-{
-    std::ostringstream out;
-    out << std::fixed << std::setprecision(4);
-    out << "speedj([";
-    std::string mod;
-    for(auto const& val : speeds)
-    {
-        out << mod << val;
-        mod = ",";
-    }
-    out << "]," << acceleration << ")\n";
-    std::string s(out.str());
-    return write(s);
-}
-bool URCommander::stopj(double a)
-{
-
-}
-
-bool URCommander::setAnalogOut(uint8_t pin, double value)
-{
-    std::ostringstream out;
-    out << "set_analog_out(" << (int)pin << "," << std::fixed << std::setprecision(4) << value << ")\n";
-    std::string s(out.str());
-    return write(s);
-}
-
-bool URCommander::setDigitalOut(uint8_t pin, bool value)
-{
-    std::ostringstream out;
-    out << "set_digital_out(" << (int)pin << "," << (value ? "True" : "False") << ")\n";
-    std::string s(out.str());
-    return write(s);
-}
-
 bool URCommander::setToolVoltage(uint8_t voltage)
 {
+  if(voltage != 0 || voltage != 12 || voltage != 24)
+    return false;
 
+  std::ostringstream out;
+  out << "set_tool_voltage(" << (int)voltage << ")\n";
+  std::string s(out.str());
+  return write(s);
 }
 
-
 bool URCommander::setFlag(uint8_t pin, bool value)
 {
-    std::ostringstream out;
-    out << "set_flag(" << (int)pin << "," << (value ? "True" : "False") << ")\n";
-    std::string s(out.str());
-    return write(s);
+  std::ostringstream out;
+  out << "set_flag(" << (int)pin << "," << (value ? "True" : "False") << ")\n";
+  std::string s(out.str());
+  return write(s);
 }
 bool URCommander::setPayload(double value)
 {
-    std::ostringstream out;
-    out << "set_payload(" << std::fixed << std::setprecision(4) << value << ")\n";
-    std::string s(out.str());
-    return write(s);
+  std::ostringstream out;
+  out << "set_payload(" << std::fixed << std::setprecision(5) << value << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+
+bool URCommander::stopj(double a)
+{
+  std::ostringstream out;
+  out << "stopj(" << std::fixed << std::setprecision(5) << a << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+
+
+bool URCommander_V1_X::speedj(std::array<double, 6> &speeds, double acceleration)
+{
+  std::ostringstream out;
+  out << std::fixed << std::setprecision(5);
+  out << "speedj(";
+  formatArray(out, speeds);
+  out << "," << acceleration << "," << 0.02 << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+bool URCommander_V1_X::setAnalogOut(uint8_t pin, double value)
+{
+  std::ostringstream out;
+  out << "set_analog_out(" << (int)pin << "," << std::fixed << std::setprecision(4) << value << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+
+bool URCommander_V1_X::setDigitalOut(uint8_t pin, bool value)
+{
+  std::ostringstream out;
+  out << "set_digital_out(" << (int)pin << "," << (value ? "True" : "False") << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+
+
+bool URCommander_V3_X::speedj(std::array<double, 6> &speeds, double acceleration)
+{
+  std::ostringstream out;
+  out << std::fixed << std::setprecision(5);
+  out << "speedj(";
+  formatArray(out, speeds);
+  out << "," << acceleration << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+bool URCommander_V3_X::setAnalogOut(uint8_t pin, double value)
+{
+  std::ostringstream out;
+  out << "set_standard_analog_out(" << (int)pin << "," << std::fixed << std::setprecision(5) << value << ")\n";
+  std::string s(out.str());
+  return write(s);
+}
+
+bool URCommander_V3_X::setDigitalOut(uint8_t pin, bool value)
+{
+  std::ostringstream out;
+  std::string func;
+
+  if(pin < 8)
+  {
+    func = "set_standard_digital_out";
+  }
+  else if(pin < 16)
+  {
+    func = "set_configurable_digital_out";
+    pin -= 8;
+  }
+  else if(pin < 18)
+  {
+    func = "set_tool_digital_out";
+    pin -= 16;
+  }
+  else
+    return false;
+
+
+  out << func << "(" << (int)pin << "," << (value ? "True" : "False") << ")\n";
+  std::string s(out.str());
+  return write(s);
 }

src/ur/server.cpp

@@ -5,47 +5,48 @@
 #include "ur_modern_driver/ur/server.h"
 
 URServer::URServer(int port)
+  : port_(port)
 {
-  std::string service = std::to_string(port);
-  struct addrinfo hints, *result;
-  std::memset(&hints, 0, sizeof(hints));
-
-  hints.ai_family = AF_UNSPEC;
-  hints.ai_socktype = SOCK_STREAM;
-  hints.ai_flags = AI_PASSIVE;
-
-  if (getaddrinfo(nullptr, service.c_str(), &hints, &result) != 0)
-  {
-    LOG_ERROR("Failed to setup recieving server");
-    return;
-  }
-
-    // loop through the list of addresses untill we find one that's connectable
-  for (struct addrinfo* p = result; p != nullptr; p = p->ai_next)
-  {
-    socket_fd_ = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
-
-    if (socket_fd_ == -1)  // socket error?
-      continue;
-
-    if (bind(socket_fd_, p->ai_addr, p->ai_addrlen) != 0)
-      continue;
-
-    // disable Nagle's algorithm to ensure we sent packets as fast as possible
-    int flag = 1;
-    setsockopt(socket_fd_, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));
-    LOG_INFO("Server awaiting connection");
-    return;
-  }
-  
-  LOG_ERROR("Failed to setup recieving server");
-  std::exit(EXIT_FAILURE);
 }
 
-URStream URServer::accept()
+std::string URServer::getIP()
 {
+  char buf[128];
+  int res = ::gethostname(buf, sizeof(buf));
+  return std::string(buf);
+}
+
+bool URServer::bind()
+{
+  std::string empty;
+  bool res = TCPSocket::setup(empty, port_);
+  state_ = TCPSocket::getState();
+  
+  if(!res)
+    return false;
+
+  if(::listen(getSocketFD(), 1) < 0)
+    return false;
+
+  return true;
+}
+
+bool URServer::accept()
+{
+  if(state_ != SocketState::Connected || client_.getSocketFD() > 0)
+    return false;
+
   struct sockaddr addr; 
   socklen_t addr_len;
-  int client_fd = ::accept(socket_fd_, &addr, &addr_len);
-  return URStream(client_fd);
+  int client_fd = ::accept(getSocketFD(), &addr, &addr_len);
+
+  if(client_fd <= 0)
+    return false;
+
+  return client_.setSocketFD(client_fd);
+}
+
+bool URServer::write(const uint8_t* buf, size_t buf_len, size_t &written)
+{
+  return client_.write(buf, buf_len, written);
 }

src/ur/stream.cpp

@@ -6,139 +6,38 @@
 #include "ur_modern_driver/log.h"
 #include "ur_modern_driver/ur/stream.h"
 
-bool URStream::connect()
+bool URStream::write(const uint8_t* buf, size_t buf_len, size_t &written)
 {
-  if (initialized_)
-    return false;
-
-  LOG_INFO("Connecting to UR @ %s:%d", host_.c_str(), port_);
-
-  // gethostbyname() is deprecated so use getadderinfo() as described in:
-  // http://www.beej.us/guide/bgnet/output/html/multipage/syscalls.html#getaddrinfo
-
-  std::string service = std::to_string(port_);
-  struct addrinfo hints, *result;
-  std::memset(&hints, 0, sizeof(hints));
-
-  hints.ai_family = AF_UNSPEC;
-  hints.ai_socktype = SOCK_STREAM;
-  hints.ai_flags = AI_PASSIVE;
-
-  if (getaddrinfo(host_.c_str(), service.c_str(), &hints, &result) != 0)
-  {
-    LOG_ERROR("Failed to get host name");
-    return false;
-  }
-
-  // loop through the list of addresses untill we find one that's connectable
-  for (struct addrinfo* p = result; p != nullptr; p = p->ai_next)
-  {
-    socket_fd_ = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
-
-    if (socket_fd_ == -1)  // socket error?
-      continue;
-
-    if (::connect(socket_fd_, p->ai_addr, p->ai_addrlen) != 0)
-    {
-      if (stopping_)
-        break;
-      else
-        continue;  // try next addrinfo if connect fails
-    }
-
-    // disable Nagle's algorithm to ensure we sent packets as fast as possible
-    int flag = 1;
-    setsockopt(socket_fd_, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));
-    initialized_ = true;
-    LOG_INFO("Connection successfully established");
-    break;
-  }
-
-  freeaddrinfo(result);
-  if (!initialized_)
-    LOG_ERROR("Connection failed");
-
-  return initialized_;
+  std::lock_guard<std::mutex> lock(write_mutex_);
+  return TCPSocket::write(buf, buf_len, written);
 }
 
-void URStream::disconnect()
+bool URStream::read(uint8_t* buf, size_t buf_len, size_t &total)
 {
-  if (!initialized_ || stopping_)
-    return;
+  std::lock_guard<std::mutex> lock(read_mutex_);   
 
-  LOG_INFO("Disconnecting from %s:%d", host_.c_str(), port_);
-
-  stopping_ = true;
-  close(socket_fd_);
-  initialized_ = false;
-}
-
-void URStream::reconnect()
-{
-  disconnect();
-  stopping_ = false;
-  connect();
-}
-
-ssize_t URStream::send(const uint8_t* buf, size_t buf_len)
-{
-  if (!initialized_)
-    return -1;
-  if (stopping_)
-    return 0;
-
-  std::lock_guard<std::mutex> lock(send_mutex_);
-
-  size_t total = 0;
-  size_t remaining = buf_len;
-
-  // TODO: handle reconnect?
-  // handle partial sends
-  while (total < buf_len)
-  {
-    ssize_t sent = ::send(socket_fd_, buf + total, remaining, 0);
-    if (sent <= 0)
-      return stopping_ ? 0 : sent;
-    total += sent;
-    remaining -= sent;
-  }
-
-  return total;
-}
-
-ssize_t URStream::receive(uint8_t* buf, size_t buf_len)
-{
-  if (!initialized_)
-    return -1;
-  if (stopping_)
-    return 0;
-
-  std::lock_guard<std::mutex> lock(receive_mutex_);    
-
-  size_t remainder = sizeof(int32_t);
-  uint8_t* buf_pos = buf;
   bool initial = true;
+  uint8_t* buf_pos = buf;
+  size_t remainder = sizeof(int32_t);
+  size_t read = 0;
 
-  do
+  while(remainder > 0 && TCPSocket::read(buf_pos, remainder, read))
   {
-    ssize_t read = recv(socket_fd_, buf_pos, remainder, 0);
-    if (read <= 0)  // failed reading from socket
-      return stopping_ ? 0 : read;
-
     if (initial)
     {
       remainder = be32toh(*(reinterpret_cast<int32_t*>(buf)));
       if (remainder >= (buf_len - sizeof(int32_t)))
       {
         LOG_ERROR("Packet size %zd is larger than buffer %zu, discarding.", remainder, buf_len);
-        return -1;
+        return false;
       }
       initial = false;
     }
 
+    total += read;
     buf_pos += read;
     remainder -= read;
-  } while (remainder > 0);
+  }
   
-  return buf_pos - buf;
+  return remainder == 0;
 }