/*!
* \brief Publishes the state of the powercube_chain as ros messages.
*
* Published to "/joint_states" as "sensor_msgs/JointState"
* Published to "state" as "pr2_controllers_msgs/JointTrajectoryState"
*/
void publishState()
{
if (initialized_)
{
ROS_INFO("publish state");
pc_ctrl_->updateStates();
sensor_msgs::JointState joint_state_msg;
joint_state_msg.header.stamp = ros::Time::now();
joint_state_msg.name = pc_params_->GetJointNames();
joint_state_msg.position = pc_ctrl_->getPositions();
joint_state_msg.velocity = pc_ctrl_->getVelocities();
pr2_controllers_msgs::JointTrajectoryControllerState controller_state_msg;
controller_state_msg.header.stamp = joint_state_msg.header.stamp;
controller_state_msg.joint_names = pc_params_->GetJointNames();
controller_state_msg.actual.positions = pc_ctrl_->getPositions();
controller_state_msg.actual.velocities = pc_ctrl_->getVelocities();
controller_state_msg.actual.accelerations = pc_ctrl_->getAccelerations();
topicPub_JointState_.publish(joint_state_msg);
topicPub_ControllerState_.publish(controller_state_msg);
last_publish_time_ = ros::Time::now();
}
}
/*!
* \brief Publishes the state of the powercube_chain as ros messages.
*
* Published to "/joint_states" as "sensor_msgs/JointState"
* Published to "state" as "pr2_controllers_msgs/JointTrajectoryState"
*/
void publishState(bool update=true)
{
if (initialized_)
{
ROS_DEBUG("publish state");
if(update)
{pc_ctrl_->updateStates();}
sensor_msgs::JointState joint_state_msg;
joint_state_msg.header.stamp = ros::Time::now();
joint_state_msg.name = pc_params_->GetJointNames();
joint_state_msg.position = pc_ctrl_->getPositions();
joint_state_msg.velocity = pc_ctrl_->getVelocities();
joint_state_msg.effort.resize(pc_params_->GetDOF());
pr2_controllers_msgs::JointTrajectoryControllerState controller_state_msg;
controller_state_msg.header.stamp = joint_state_msg.header.stamp;
controller_state_msg.joint_names = pc_params_->GetJointNames();
controller_state_msg.actual.positions = pc_ctrl_->getPositions();
controller_state_msg.actual.velocities = pc_ctrl_->getVelocities();
controller_state_msg.actual.accelerations = pc_ctrl_->getAccelerations();
std_msgs::String opmode_msg;
opmode_msg.data = "velocity";
/// publishing joint and controller states on topic
topicPub_JointState_.publish(joint_state_msg);
topicPub_ControllerState_.publish(controller_state_msg);
topicPub_OperationMode_.publish(opmode_msg);
last_publish_time_ = joint_state_msg.header.stamp;
}
// check status of PowerCube chain
if (pc_ctrl_->getPC_Status() != PowerCubeCtrl::PC_CTRL_OK) { error_ = true; }
// check status of PowerCube chain
if (pc_ctrl_->getPC_Status() != PowerCubeCtrl::PC_CTRL_OK)
{
error_ = true;
}
else
{
error_ = false;
}
// publishing diagnotic messages
diagnostic_msgs::DiagnosticArray diagnostics;
diagnostics.status.resize(1);
// set data to diagnostics
if(error_)
{
diagnostics.status[0].level = 2;
diagnostics.status[0].name = n_.getNamespace();;
diagnostics.status[0].message = pc_ctrl_->getErrorMessage();
}
else
{
if (initialized_)
{
diagnostics.status[0].level = 0;
diagnostics.status[0].name = n_.getNamespace(); //"schunk_powercube_chain";
diagnostics.status[0].message = "powercubechain initialized and running";
}
else
{
diagnostics.status[0].level = 1;
diagnostics.status[0].name = n_.getNamespace(); //"schunk_powercube_chain";
diagnostics.status[0].message = "powercubechain not initialized";
}
}
// publish diagnostic message
topicPub_Diagnostic_.publish(diagnostics);
}
/*!
* \brief Executes the callback from the command_vel topic.
*
* Set the current velocity target.
* \param msg JointVelocities
*/
void topicCallback_CommandVel(const brics_actuator::JointVelocities::ConstPtr& msg)
{
ROS_DEBUG("Received new velocity command");
if (!initialized_)
{
ROS_WARN("Skipping command: powercubes not initialized");
publishState(false);
return;
}
if (pc_ctrl_->getPC_Status() != PowerCubeCtrl::PC_CTRL_OK)
{
publishState(false);
return;
}
PowerCubeCtrl::PC_CTRL_STATUS status;
std::vector<std::string> errorMessages;
pc_ctrl_->getStatus(status, errorMessages);
/// ToDo: don't rely on position of joint names, but merge them (check between msg.joint_uri and member variable JointStates)
unsigned int DOF = pc_params_->GetDOF();
std::vector<std::string> jointNames = pc_params_->GetJointNames();
std::vector<double> cmd_vel(DOF);
std::string unit = "rad";
/// check dimensions
if (msg->velocities.size() != DOF)
{
ROS_ERROR("Skipping command: Commanded velocities and DOF are not same dimension.");
return;
}
/// parse velocities
for (unsigned int i = 0; i < DOF; i++)
{
/// check joint name
if (msg->velocities[i].joint_uri != jointNames[i])
{
ROS_ERROR("Skipping command: Received joint name %s doesn't match expected joint name %s for joint %d.",msg->velocities[i].joint_uri.c_str(),jointNames[i].c_str(),i);
return;
}
/// check unit
if (msg->velocities[i].unit != unit)
{
ROS_ERROR("Skipping command: Received unit %s doesn't match expected unit %s.",msg->velocities[i].unit.c_str(),unit.c_str());
return;
}
/// if all checks are successful, parse the velocity value for this joint
ROS_DEBUG("Parsing velocity %f for joint %s",msg->velocities[i].value,jointNames[i].c_str());
cmd_vel[i] = msg->velocities[i].value;
}
/// command velocities to powercubes
if (!pc_ctrl_->MoveVel(cmd_vel))
{
error_ = true;
error_msg_ = pc_ctrl_->getErrorMessage();
ROS_ERROR("Skipping command: %s",pc_ctrl_->getErrorMessage().c_str());
return;
}
ROS_DEBUG("Executed velocity command");
publishState(false);
}
/*!
* \brief Gets parameters from the robot_description and configures the powercube_chain.
*/
void getRobotDescriptionParameters()
{
unsigned int DOF = pc_params_->GetDOF();
std::vector<std::string> JointNames = pc_params_->GetJointNames();
/// Get robot_description from ROS parameter server
std::string param_name = "robot_description";
std::string full_param_name;
std::string xml_string;
n_.searchParam(param_name, full_param_name);
if (n_.hasParam(full_param_name))
{
n_.getParam(full_param_name.c_str(), xml_string);
}
else
{
ROS_ERROR("Parameter %s not set, shutting down node...", full_param_name.c_str());
n_.shutdown();
}
if (xml_string.size() == 0)
{
ROS_ERROR("Unable to load robot model from parameter %s",full_param_name.c_str());
n_.shutdown();
}
ROS_DEBUG("%s content\n%s", full_param_name.c_str(), xml_string.c_str());
/// Get urdf model out of robot_description
urdf::Model model;
if (!model.initString(xml_string))
{
ROS_ERROR("Failed to parse urdf file");
n_.shutdown();
}
ROS_DEBUG("Successfully parsed urdf file");
/// Get max velocities out of urdf model
std::vector<double> MaxVelocities(DOF);
for (unsigned int i = 0; i < DOF; i++)
{
MaxVelocities[i] = model.getJoint(JointNames[i].c_str())->limits->velocity;
}
/// Get lower limits out of urdf model
std::vector<double> LowerLimits(DOF);
for (unsigned int i = 0; i < DOF; i++)
{
LowerLimits[i] = model.getJoint(JointNames[i].c_str())->limits->lower;
}
// Get upper limits out of urdf model
std::vector<double> UpperLimits(DOF);
for (unsigned int i = 0; i < DOF; i++)
{
UpperLimits[i] = model.getJoint(JointNames[i].c_str())->limits->upper;
}
/// Get offsets out of urdf model
std::vector<double> Offsets(DOF);
for (unsigned int i = 0; i < DOF; i++)
{
Offsets[i] = model.getJoint(JointNames[i].c_str())->calibration->rising.get()[0];
}
/// Set parameters
pc_params_->SetMaxVel(MaxVelocities);
pc_params_->SetLowerLimits(LowerLimits);
pc_params_->SetUpperLimits(UpperLimits);
pc_params_->SetOffsets(Offsets);
}