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Since there is not a ros::shutdown something like this might be an alternative.

#include <ArduinoHardware.h>
#include <ros.h>
#include <geometry_msgs/Twist.h>
#include <sensor_msgs/Joy.h>

ros::NodeHandle nh;

geometry_msgs::Twist msg;
//Use a variable to store the speed
float speed = 0.1;

void joyCall(const sensor_msgs::Joy& joy){
if (joy.buttons[14]==1)
  speed = 0.0;

}

ros::Subscriber<sensor_msgs::Joy> sub("bluetooth_teleop/joy", &joyCall);
ros::Publisher pub("/cmd_vel", &msg);

void setup()
{
 nh.initNode();
 nh.advertise(pub);
 nh.subscribe(sub);
} 
void loop(){

  msg.linear.x=speed;
  pub.publish(&msg);
  nh.spinOnce();
}

or if you want the publisher to quit, this could be an option.

#include <ArduinoHardware.h>
#include <ros.h>
#include <geometry_msgs/Twist.h>
#include <sensor_msgs/Joy.h>

ros::NodeHandle nh;

geometry_msgs::Twist msg;
ros::Subscriber<sensor_msgs::Joy> sub("bluetooth_teleop/joy", &joyCall);
ros::Publisher pub("/cmd_vel", &msg);

bool flag;

void joyCall(const sensor_msgs::Joy& joy){
  if (joy.buttons[14]==1)
  { //Set to zero and set flag so it quits publishing
    msg.linear.x = 0.0;
    pub.publish(&msg);
    flag = false;
  }  
}

void setup()
{
 flag = true;
 nh.initNode();
 nh.advertise(pub);
 nh.subscribe(sub);
}

void loop()
{
  if(flag)
  {
    msg.linear.x=0.1;
    pub.publish(&msg);
  }
  nh.spinOnce();
}