servo_keyboard_input.cpp

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/*      Title     : servo_keyboard_input.cpp
 *      Project   : moveit_servo
 *      Created   : 05/31/2021
 *      Author    : Adam Pettinger, V Mohammed Ibrahim
 */
 
#include <chrono>
#include <control_msgs/msg/joint_jog.hpp>
#include <geometry_msgs/msg/twist_stamped.hpp>
#include <moveit_msgs/srv/servo_command_type.hpp>
#include <rclcpp/rclcpp.hpp>
#include <signal.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
 
// Define used keys
namespace
{
constexpr int8_t KEYCODE_RIGHT = 0x43;
constexpr int8_t KEYCODE_LEFT = 0x44;
constexpr int8_t KEYCODE_UP = 0x41;
constexpr int8_t KEYCODE_DOWN = 0x42;
constexpr int8_t KEYCODE_PERIOD = 0x2E;
constexpr int8_t KEYCODE_SEMICOLON = 0x3B;
constexpr int8_t KEYCODE_1 = 0x31;
constexpr int8_t KEYCODE_2 = 0x32;
constexpr int8_t KEYCODE_3 = 0x33;
constexpr int8_t KEYCODE_4 = 0x34;
constexpr int8_t KEYCODE_5 = 0x35;
constexpr int8_t KEYCODE_6 = 0x36;
constexpr int8_t KEYCODE_7 = 0x37;
constexpr int8_t KEYCODE_Q = 0x71;
constexpr int8_t KEYCODE_R = 0x72;
constexpr int8_t KEYCODE_J = 0x6A;
constexpr int8_t KEYCODE_T = 0x74;
constexpr int8_t KEYCODE_W = 0x77;
constexpr int8_t KEYCODE_E = 0x65;
}  // namespace
 
// Some constants used in the Servo Teleop demo
namespace
{
const std::string TWIST_TOPIC = "/servo_node/delta_twist_cmds";
const std::string JOINT_TOPIC = "/servo_node/delta_joint_cmds";
const size_t ROS_QUEUE_SIZE = 10;
const std::string PLANNING_FRAME_ID = "panda_link0";
const std::string EE_FRAME_ID = "panda_link8";
}  // namespace
 
// A class for reading the key inputs from the terminal
class KeyboardReader
{
public:
  KeyboardReader() : file_descriptor_(0)
  {
    // get the console in raw mode
    tcgetattr(file_descriptor_, &cooked_);
    struct termios raw;
    memcpy(&raw, &cooked_, sizeof(struct termios));
    raw.c_lflag &= ~(ICANON | ECHO);
    // Setting a new line, then end of file
    raw.c_cc[VEOL] = 1;
    raw.c_cc[VEOF] = 2;
    tcsetattr(file_descriptor_, TCSANOW, &raw);
  }
  void readOne(char* c)
  {
    int rc = read(file_descriptor_, c, 1);
    if (rc < 0)
    {
      throw std::runtime_error("read failed");
    }
  }
  void shutdown()
  {
    tcsetattr(file_descriptor_, TCSANOW, &cooked_);
  }
 
private:
  int file_descriptor_;
  struct termios cooked_;
};
 
// Converts key-presses to Twist or Jog commands for Servo, in lieu of a controller
class KeyboardServo
{
public:
  KeyboardServo();
  int keyLoop();
 
private:
  void spin();
 
  rclcpp::Node::SharedPtr nh_;
 
  rclcpp::Publisher<geometry_msgs::msg::TwistStamped>::SharedPtr twist_pub_;
  rclcpp::Publisher<control_msgs::msg::JointJog>::SharedPtr joint_pub_;
  rclcpp::Client<moveit_msgs::srv::ServoCommandType>::SharedPtr switch_input_;
 
  std::shared_ptr<moveit_msgs::srv::ServoCommandType::Request> request_;
  double joint_vel_cmd_;
  std::string command_frame_id_;
};
 
KeyboardServo::KeyboardServo() : joint_vel_cmd_(1.0), command_frame_id_{ "panda_link0" }
{
  nh_ = rclcpp::Node::make_shared("servo_keyboard_input");
 
  twist_pub_ = nh_->create_publisher<geometry_msgs::msg::TwistStamped>(TWIST_TOPIC, ROS_QUEUE_SIZE);
  joint_pub_ = nh_->create_publisher<control_msgs::msg::JointJog>(JOINT_TOPIC, ROS_QUEUE_SIZE);
 
  // Client for switching input types
  switch_input_ = nh_->create_client<moveit_msgs::srv::ServoCommandType>("servo_node/switch_command_type");
}
 
KeyboardReader input;
 
void quit(int sig)
{
  (void)sig;
  input.shutdown();
  rclcpp::shutdown();
  exit(0);
}
 
int main(int argc, char** argv)
{
  rclcpp::init(argc, argv);
  KeyboardServo keyboard_servo;
 
  signal(SIGINT, quit);
 
  int rc = keyboard_servo.keyLoop();
  input.shutdown();
  rclcpp::shutdown();
 
  return rc;
}
 
void KeyboardServo::spin()
{
  while (rclcpp::ok())
  {
    rclcpp::spin_some(nh_);
  }
}
 
int KeyboardServo::keyLoop()
{
  char c;
  bool publish_twist = false;
  bool publish_joint = false;
 
  std::thread{ [this]() { return spin(); } }.detach();
 
  puts("Reading from keyboard");
  puts("---------------------------");
  puts("All commands are in the planning frame");
  puts("Use arrow keys and the '.' and ';' keys to Cartesian jog");
  puts("Use 1|2|3|4|5|6|7 keys to joint jog. 'r' to reverse the direction of jogging.");
  puts("Use 'j' to select joint jog. ");
  puts("Use 't' to select twist ");
  puts("Use 'w' and 'e' to switch between sending command in planning frame or end effector frame");
  puts("'Q' to quit.");
 
  for (;;)
  {
    // get the next event from the keyboard
    try
    {
      input.readOne(&c);
    }
    catch (const std::runtime_error&)
    {
      perror("read():");
      return -1;
    }
 
    RCLCPP_DEBUG(nh_->get_logger(), "value: 0x%02X\n", c);
 
    // // Create the messages we might publish
    auto twist_msg = std::make_unique<geometry_msgs::msg::TwistStamped>();
    auto joint_msg = std::make_unique<control_msgs::msg::JointJog>();
 
    joint_msg->joint_names.resize(7);
    joint_msg->joint_names = { "panda_joint1", "panda_joint2", "panda_joint3", "panda_joint4",
                               "panda_joint5", "panda_joint6", "panda_joint7" };
 
    joint_msg->velocities.resize(7);
    std::fill(joint_msg->velocities.begin(), joint_msg->velocities.end(), 0.0);
    // Use read key-press
    switch (c)
    {
      case KEYCODE_LEFT:
        RCLCPP_DEBUG(nh_->get_logger(), "LEFT");
        twist_msg->twist.linear.y = -0.5;
        publish_twist = true;
        break;
      case KEYCODE_RIGHT:
        RCLCPP_DEBUG(nh_->get_logger(), "RIGHT");
        twist_msg->twist.linear.y = 0.5;
        publish_twist = true;
        break;
      case KEYCODE_UP:
        RCLCPP_DEBUG(nh_->get_logger(), "UP");
        twist_msg->twist.linear.x = 0.5;
        publish_twist = true;
        break;
      case KEYCODE_DOWN:
        RCLCPP_DEBUG(nh_->get_logger(), "DOWN");
        twist_msg->twist.linear.x = -0.5;
        publish_twist = true;
        break;
      case KEYCODE_PERIOD:
        RCLCPP_DEBUG(nh_->get_logger(), "PERIOD");
        twist_msg->twist.linear.z = -0.5;
        publish_twist = true;
        break;
      case KEYCODE_SEMICOLON:
        RCLCPP_DEBUG(nh_->get_logger(), "SEMICOLON");
        twist_msg->twist.linear.z = 0.5;
        publish_twist = true;
        break;
      case KEYCODE_1:
        RCLCPP_DEBUG(nh_->get_logger(), "1");
        joint_msg->velocities[0] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_2:
        RCLCPP_DEBUG(nh_->get_logger(), "2");
        joint_msg->velocities[1] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_3:
        RCLCPP_DEBUG(nh_->get_logger(), "3");
        joint_msg->velocities[2] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_4:
        RCLCPP_DEBUG(nh_->get_logger(), "4");
        joint_msg->velocities[3] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_5:
        RCLCPP_DEBUG(nh_->get_logger(), "5");
        joint_msg->velocities[4] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_6:
        RCLCPP_DEBUG(nh_->get_logger(), "6");
        joint_msg->velocities[5] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_7:
        RCLCPP_DEBUG(nh_->get_logger(), "7");
        joint_msg->velocities[6] = joint_vel_cmd_;
        publish_joint = true;
        break;
      case KEYCODE_R:
        RCLCPP_DEBUG(nh_->get_logger(), "r");
        joint_vel_cmd_ *= -1;
        break;
      case KEYCODE_J:
        RCLCPP_DEBUG(nh_->get_logger(), "j");
        request_ = std::make_shared<moveit_msgs::srv::ServoCommandType::Request>();
        request_->command_type = moveit_msgs::srv::ServoCommandType::Request::JOINT_JOG;
        if (switch_input_->wait_for_service(std::chrono::seconds(1)))
        {
          auto result = switch_input_->async_send_request(request_);
          if (result.get()->success)
          {
            RCLCPP_INFO_STREAM(nh_->get_logger(), "Switched to input type: JointJog");
          }
          else
          {
            RCLCPP_WARN_STREAM(nh_->get_logger(), "Could not switch input to: JointJog");
          }
        }
        break;
      case KEYCODE_T:
        RCLCPP_DEBUG(nh_->get_logger(), "t");
        request_ = std::make_shared<moveit_msgs::srv::ServoCommandType::Request>();
        request_->command_type = moveit_msgs::srv::ServoCommandType::Request::TWIST;
        if (switch_input_->wait_for_service(std::chrono::seconds(1)))
        {
          auto result = switch_input_->async_send_request(request_);
          if (result.get()->success)
          {
            RCLCPP_INFO_STREAM(nh_->get_logger(), "Switched to input type: Twist");
          }
          else
          {
            RCLCPP_WARN_STREAM(nh_->get_logger(), "Could not switch input to: Twist");
          }
        }
        break;
      case KEYCODE_W:
        RCLCPP_DEBUG(nh_->get_logger(), "w");
        RCLCPP_INFO_STREAM(nh_->get_logger(), "Command frame set to: " << PLANNING_FRAME_ID);
        command_frame_id_ = PLANNING_FRAME_ID;
        break;
      case KEYCODE_E:
        RCLCPP_DEBUG(nh_->get_logger(), "e");
        RCLCPP_INFO_STREAM(nh_->get_logger(), "Command frame set to: " << EE_FRAME_ID);
        command_frame_id_ = EE_FRAME_ID;
        break;
      case KEYCODE_Q:
        RCLCPP_DEBUG(nh_->get_logger(), "quit");
        return 0;
    }
 
    // If a key requiring a publish was pressed, publish the message now
    if (publish_twist)
    {
      twist_msg->header.stamp = nh_->now();
      twist_msg->header.frame_id = command_frame_id_;
      twist_pub_->publish(std::move(twist_msg));
      publish_twist = false;
    }
    else if (publish_joint)
    {
      joint_msg->header.stamp = nh_->now();
      joint_msg->header.frame_id = PLANNING_FRAME_ID;
      joint_pub_->publish(std::move(joint_msg));
      publish_joint = false;
    }
  }
 
  return 0;
}