Tuan's profile - activity

Hi,

I am trying to publish a latched message in rosjava so that my arduino only receives a command when it is different than the preivous one. Currently, it is constantly polling and that makes my program not to work.

In roscpp, I know that you can set the boolean latch = true.

Is there an equivalent in rosjava?

Thanks.

I am using ROS Diamondback on Ubuntu 10.10.

I was running my ROS node without problem until I tried ssh to run a rosnode from a remote machine.

After that, on my own machine, when I run I ROS node which has been working fine earlier using rosrun, I encountered this error message:

error while loading shared libraries: libros.so: cannot open shared object file: No such file or directory

Any pointers on how to fix this please? Thank you very much.

Hi,

I am currrently using rosjava to create an control interface on my tablet to control a robot. Everything works fine except that rosbag does not record information from the nodes created by rosjava.

May I know if this logging feature has been supported for rosjava? If yes then how to enable it? Thank you very much.

Hi,

I am new to ROS so please help me with this.

I follow the tutorial to set up Stage and everything was fine until I am trying to use stageros to load an existing world file (also part of the tutorial)

Input:

tuan@tuan-laptop:/opt/ros/diamondback/stacks/simulator_stage/stage$ ./bin/stageros world/willow-erratic.world

Output:

Segmentation fault.

The error message is too simple and do not provide much information for me to debug. Please help.

Thanks very much.

Tuan.

Hi,

I am trying to access the map_server through a client service call to retrieve map information through nav_msgs/OccupancyGrid into my android device using pure implementation Rosjava. However, it seems that there is currently no support for that in Rosjava.

Could anyone help me if you have tried and solved a similar problem?

Thank you very much.

Hi, 

I am trying out the rosjava image_transport tutorial by importing it as an android project in Eclipse and port it to a Motorola Xoom.

To get the sample code to compile, I have modified it slightly (see code fragment below) and also delete the line in main.xml that contains the android:src=”@drawable/” as it could not be resolved.

Problem:

Image is not displayed although checks show that the node is connected to host PC roscore (rxgraph shows android node and shows that it subscribes to /camera/image/compressed for the correct message sensor_msgs/CompressedImage)

I have tried to call a similar subscriber node - code from ( http://www.ros.org/wiki/image_transpo... ) on my PC and I can retrieve a static image. I look through the code for this node and it required OpenCV to display the image through the bridge class.

For the Xoom, I guess I just miss one line of code that call the image to display on the Xoom. I look through the RosImageView class and I guess the line image.setMessageToBitmapCallable(new BitmapFromCompressedImage()); will serve a similar function.

However, no image is shown on the Xoom.

Could any one offer help on this please?

Please refer to the code fragment below and my configuration.

...   public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

//1. Initialise connection to host PC here    

try {

//2.1 First manually set the URI & port of MASTER node (the node that contains roscore)   

java.net.URI master_uri = new java.net.URI("http://129.31.193.253:11311");

   //2.2 Assign the configuration to the tablet with its own address so that roscore can talk back to

  nodeConfiguration = NodeConfiguration.newPublic("129.31.202.25",master_uri);

   //2.3 Add the master URI & port set up in 2.1 to the configuration

  nodeConfiguration.setMasterUri(master_uri);

} catch (Exception e) {

  throw new RuntimeException(e);

}

//retrieving the image from host

    image = (RosImageView<compressedimage>) findViewById(R.id.image_);

    image.setTopicName("/camera/image/compressed");

    image.setMessageType("sensor_msgs/CompressedImage");

    image.setMessageToBitmapCallable(new BitmapFromCompressedImage());

//    startActivityForResult(new Intent(this, MasterChooser.class), 0); // comment because causing forced close

    try{

     nodeRunner.run(image,nodeConfiguration);

    }

    catch(Exception e){

     throw new RuntimeException(e);

    }     

  }

…

My configuration is as follows:

Basic

• Ubuntu 10.10 

• ROSDiamondback

• Porting into a Motorola Xoom (wifi) – android API level 11 (but I compile at level 9)

• Have already successfully tested RosjavaPubSub tutorial

ROS

• Host PC running roscore

• Host PC running image_transport publisher that publishes a static image - exactly the same code as the tutorial at

http://www.ros.org/wiki/image_transpo...

Hi,

I am new to ROS. As I am trying to start rviz following the tutorial, I receive this error message right after issuing "rosrun rviz rviz". Please help me if you know the solution. Thanks.

Tuan

Failed to initialize Ogre: OGRE EXCEPTION(7:InternalErrorException): Could not load dynamic library Plugin_CgProgramManager. System Error: Plugin_CgProgramManager.so: cannot open shared object file: No such file or directory in DynLib::load at /tmp/buildd/ros-diamondback-visualization-common-1.4.1/debian/ros-diamondback-visualization-common/opt/ros/diamondback/stacks/visualization_common/ogre/build/ogre_src_v1-7-1/OgreMain/src/OgreDynLib.cpp (line 91)