Difference between revisions of "ROS2"

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==<font color='blue'>Status</font>==
 
==<font color='blue'>Status</font>==
 
Development
 
Development
 +
==<font color='blue'>News</font>==
 +
* [2019/01/03] Updated the cross-compiled version from '''ardent''' to '''bouncy'''. PC was already at '''bouncy''' because rclnodejs will work with '''bouncy''' only (not yet compatible with '''crystal''').
 +
Updated because ''bouncy'' would not 'see' ''ardent'' nodes & services and vice versa.
  
 
==<font color='blue'>Interfaces</font>==
 
==<font color='blue'>Interfaces</font>==
Line 32: Line 35:
 
===Installation===
 
===Installation===
 
* For Embedded Linux (but not Ubuntu Distro) use [https://github.com/bmwcarit/meta-ros.git meta-ros.git]. What about <font color='red'>[https://github.com/erlerobot/meta-ros2 meta-ros2]</font>?
 
* For Embedded Linux (but not Ubuntu Distro) use [https://github.com/bmwcarit/meta-ros.git meta-ros.git]. What about <font color='red'>[https://github.com/erlerobot/meta-ros2 meta-ros2]</font>?
<font color='green'>'''TODO:''' Include [https://github.com/bmwcarit/meta-ros.git meta-ros.git] in [https://git.elphel.com/Elphel/elphel393 elphel393] build system.</font>
+
<font color='green'><s>'''TODO:''' Include [https://github.com/bmwcarit/meta-ros.git meta-ros.git] in [https://git.elphel.com/Elphel/elphel393 elphel393] build system.</s></font>
 +
 
 +
<font color='green'>'''DONE:''' included a forked version [https://github.com/okdzhimiev/meta-ros/ okdzhimiev/meta-ros]</font>
 +
 
 
====Include meta-ros to elphel393====
 
====Include meta-ros to elphel393====
 
* Add path to bblayers.conf
 
* Add path to bblayers.conf
 
* Add to "IMAGE_INSTALL_append" of core-image-elphel393.bb:
 
* Add to "IMAGE_INSTALL_append" of core-image-elphel393.bb:
  packagegroup-ros2-world \
+
  <font size='2'>packagegroup-ros2-world \</font>
 +
 
 +
===Notes===
 +
* Cross-compilation for ARM
 +
* ROS2 for python populates '''/usr/lib/python3.5/site-packages/''' so python scripts can live anywhere.
 +
* For command line apps, like ''ros2 ...'', if AMENT_PREFIX_PATH is not set then:
 +
<font size='1' color='red'>'''OSError: Environment variable 'AMENT_PREFIX_PATH' is not set or empty'''</font>
 +
* Useful commands (command line):
 +
<font size='2'>export AMENT_PREFIX_PATH=/usr</font>
 +
 
 +
<font size='2'>ros2 pkg list
 +
ros2 node list
 +
ros2 srv list
 +
ros2 srv show std_srvs/Trigger
 +
ros2 msg list
 +
ros2 msg show std_msgs/String</font>
 +
 
 +
===Demos===
 +
====talker-listener cpp====
 +
<font size='2'>''# terminal 1:''
 +
export AMENT_PREFIX_PATH=/usr
 +
ros2 run demo_nodes_cpp talker
 +
 +
''# terminal 2:''
 +
export AMENT_PREFIX_PATH=/usr
 +
ros2 run demo_nodes_cpp listener</font>
  
 
===Workflow===
 
===Workflow===
 +
* Use example recipes from [https://github.com/bmwcarit/meta-ros.git meta-ros.git]
 +
* ''bitbake package-name'', check output and logs in the poky build tree
 +
* List package in core-image-elphel393.bb's ''IMAGE_INSTALL_append''
 +
<font color='green'>'''TODO:'''
 +
* Add ''target-scp'' and an example empty recipe</font>
  
 
==<font color='blue'>ROS2 on PC</font>==
 
==<font color='blue'>ROS2 on PC</font>==
 
===Installation===
 
===Installation===
 
* Google and follow the [https://index.ros.org/doc/ros2/ general instructions].
 
* Google and follow the [https://index.ros.org/doc/ros2/ general instructions].
<font color='green'>'''Notes:'''
 
* '''apt install ros-bouncy-desktop''' available in 18.04, <font color='red'>n/a in 16.04</font>
 
* '''apt install ros-ardent-desktop''' available in 16.04</font>
 
  
===Workflow===
+
===Notes===
* ROS2 will get installed to '''/opt/ros/<name>''', <name> = ardent, bouncy.
+
* Switched to installing from a ''fat'' archive
 
* Terminal setup:
 
* Terminal setup:
  source /opt/ros/bouncy/setup.bash
+
  <font size='2'>''source /path/setup.bash''</font>
or
 
source /opt/ros/bouncy/local_setup.bash
 
  
 +
===Workflow===
 
* Create a workspace
 
* Create a workspace
 
* Create some packages inside or clone - they have a [https://github.com/dirk-thomas/vcstool vcs tool] to clone all repos from a text file.
 
* Create some packages inside or clone - they have a [https://github.com/dirk-thomas/vcstool vcs tool] to clone all repos from a text file.
 
* Install [https://colcon.readthedocs.io/en/released/user/quick-start.html colcon]
 
* Install [https://colcon.readthedocs.io/en/released/user/quick-start.html colcon]
 
* Then build with colcon
 
* Then build with colcon
* Packages will not get installed to /opt/ros/bouncy/... Instead they will stay in their folders.
+
* New packages will not get installed anywhere. They live in their folders.
 
* To use a package:
 
* To use a package:
  source /opt/ros/bouncy/setup.bash
+
  <font size='2'>source ~/ros2_ws/some-package/install/setup.bash
source ~/ros2_ws/some-package/install/local_setup.bash
 
 
  ros2 pkg list
 
  ros2 pkg list
  then run anything in this terminal
+
  then run anything in this terminal</font>
 
* Python scripts can live anywhere - just run them from that sourced terminal
 
* Python scripts can live anywhere - just run them from that sourced terminal
* [https://erlerobotics.gitbooks.io/erle-robotics-python-gitbook-free/udp_and_tcp/a_simple_tcp_client_and_server.html Good book about UDP?]
+
 
 +
==<font color='blue'>ROS2 in Docker</font>==
 +
docker pull osrf/ros2:bouncy-desktop
 +
docker run -i -t osrf/ros2:bouncy-desktop
 +
No network, no colcon, no ament...
  
 
==<font color='blue'>ROS2 General Notes</font>==
 
==<font color='blue'>ROS2 General Notes</font>==
 
===Notes===
 
===Notes===
 
* SROS is Secure ROS or something
 
* SROS is Secure ROS or something
 +
 
===Useful links===
 
===Useful links===
* [http://docs.erlerobotics.com/robot_operating_system/ros2/tutorials/tutorial_10 Tutorials ErleRobotics]
 
* [https://github.com/intel/ros2_intel_realsense Intel RealSense]
 
* [https://index.ros.org/doc/ros2/Ament-Tutorial/ Ament tutorial] - will not work for PC because it's outdated, will work in Yocto
 
* [https://index.ros.org/doc/ros2/Colcon-Tutorial/ Colcon tutorial] - this one worked for PC
 
* [https://discourse.ros.org/t/suggestions-for-std-srvs/1079/16 STD-SRVS '''discussion'''] & [https://github.com/ros2/examples/issues/4 ROS2 examples(?)]
 
* [https://discourse.ros.org/search?q=meta-ros%20order%3Alatest About meta-ros]
 
  
===Docker===
+
* [http://docs.erlerobotics.com/robot_operating_system/ros2 ErleRobotics Tutorials on ROS2] - very useful
docker pull osrf/ros2:bouncy-desktop
+
 
docker run -i -t osrf/ros2:bouncy-desktop
+
* [https://index.ros.org/doc/ros2/Ament-Tutorial/ Ament tutorial] - build system for new packages
...no network, no colcon, no ament...
+
** works and supported in meta-ros
 +
** will not work for PC because repo hashes moved on?
 +
 
 +
* [https://index.ros.org/doc/ros2/Colcon-Tutorial/ Colcon tutorial] - newest build system for new packages
 +
** works for PC, even in 16.04
 +
** not supported in meta-ros (as of 2018/12/07)
 +
** [https://colcon.readthedocs.io/en/released/user/how-to.html#build-only-a-single-package-or-selected-packages colcon docs]
 +
 
 +
* [https://discourse.ros.org/search?q=meta-ros%20order%3Alatest About meta-ros] and [https://discourse.ros.org/search?q=meta-ros2%20order%3Alatest about meta-ros2] - are they merged?
  
==<font color='blue'>ROS2 on Zynq</font>==
+
Networking:
Cross-compiled and installed in Yocto
 
  
===Other links===
 
 
* [http://design.ros2.org/articles/ros_on_dds.html ROS on DDS]
 
* [http://design.ros2.org/articles/ros_on_dds.html ROS on DDS]
 
  <font size='2'>...  
 
  <font size='2'>...  
Line 95: Line 131:
 
* [http://www.eprosima.com/index.php/resources-all/performance/40-eprosima-fast-rtps-performance FastRTPS benchmarks]
 
* [http://www.eprosima.com/index.php/resources-all/performance/40-eprosima-fast-rtps-performance FastRTPS benchmarks]
 
* [http://docs.eprosima.com/en/latest/advanced.html FastRTPS max message size]
 
* [http://docs.eprosima.com/en/latest/advanced.html FastRTPS max message size]
* [https://wiki.ros.org/Services Request-Response is done with '''service''']. Format [https://wiki.ros.org/srv srv]
+
* [https://erlerobotics.gitbooks.io/erle-robotics-python-gitbook-free/udp_and_tcp/a_simple_tcp_client_and_server.html Good book about UDP?]
  
===Work===
+
ROS2 Services:
  
====Available packages====
+
* [https://wiki.ros.org/Services Request-Response is done with '''service''']. Format [https://wiki.ros.org/srv srv]
* SSH session:
+
* [https://discourse.ros.org/t/suggestions-for-std-srvs/1079/16 STD-SRVS '''discussion'''] & [https://github.com/ros2/examples/issues/4 ROS2 examples(?)]
root@elphel393:~# export AMENT_PREFIX_PATH=/usr
 
root@elphel393:~# ros2 pkg list
 
<font size='1'>builtin_interfaces
 
demo_nodes_cpp
 
...
 
sensor_msgs</font>
 
  
====Test Talker and Listener====
+
===Reference ROS repos===
* SSH session 1:
+
* [https://github.com/inertialsense/inertial_sense_ros.git inertial_sense_ros.git] - cpp
root@elphel393:~# export AMENT_PREFIX_PATH=/usr
+
* [https://github.com/intel/ros2_intel_realsense.git ros2_intel_realsense.git] - cpp
root@elphel393:~# ros2 run demo_nodes_cpp talker
+
* [https://github.com/ros-drivers/axis_camera.git axis_camera.git] - python
* SSH session 2:
+
* [https://github.com/bmwcarit/meta-ros.git meta-ros.git] - layer for Yocto
root@elphel393:~# export AMENT_PREFIX_PATH=/usr
 
root@elphel393:~# ros2 run demo_nodes_cpp listener
 
 
 
<font color='green'>'''Notes:'''</font>
 
* It populates '''/usr/lib/python3.5/site-packages/''' so python scripts can be pretty much standalone
 
* <font color='green'>If AMENT_PREFIX_PATH is not set (only for command line apps) then:</font>
 
<font size='1' color='red'>'''OSError: Environment variable 'AMENT_PREFIX_PATH' is not set or empty'''</font>
 
  
 
==<font color='blue'>ROS1</font>==
 
==<font color='blue'>ROS1</font>==
 
+
<font color='red'>'''Won't build'''</font>. [[ROS1|More info]].
===Build===
 
<font color='red'>'''Won't build'''</font>
 
<font size='1'>Build Configuration:
 
BB_VERSION          = "1.37.0"
 
BUILD_SYS            = "x86_64-linux"
 
NATIVELSBSTRING      = "universal"
 
TARGET_SYS          = "arm-poky-linux-gnueabi"
 
MACHINE              = "elphel393"
 
DISTRO              = "poky"
 
DISTRO_VERSION      = "2.4+snapshot-20181204"
 
TUNE_FEATURES        = "arm armv7a vfp neon cortexa9"
 
TARGET_FPU          = "softfp"
 
meta               
 
meta-poky           
 
meta-yocto-bsp      = "HEAD:72867393fe2004ab9f0ee23eb09a975c82938b9e"
 
meta-ezynq          = "rocko:046de13c06cc248b725cb7b9928f35d4a369b50f"
 
meta-elphel393      = "rocko:0cea9b9b8776f0fe725316f1be1501396c95feb4"
 
meta-ros            = "HEAD:72068b17e4192b51e09c8dc633805a35edac8701"
 
meta-xilinx-bsp      = "HEAD:a18947c20dba2c0c38db8bde1ad4684995df4bbd"
 
meta-oe             
 
meta-python         
 
meta-networking     
 
meta-webserver      = "HEAD:34aa4c3202b427f59f843dc43a4e1afda4f81d13"</font>
 
 
 
* Error 1:
 
** ROS_USE_PYTHON3 = "yes"
 
** IMAGE_INSTALL += "roslaunch"
 
 
 
<font size='1'>NOTE: Resolving any missing task queue dependencies
 
ERROR: Nothing RPROVIDES 'python3-pycrypto' (but /home/oleg/GIT/elphel393_rocko_clean_install/meta/meta-ros/recipes-devtools/python/python3-paramiko_1.16.0.bb RDEPENDS on or otherwise requires it)
 
NOTE: Runtime target 'python3-pycrypto' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['python3-pycrypto']
 
NOTE: Runtime target 'python3-paramiko' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['python3-paramiko', 'python3-pycrypto']
 
NOTE: Runtime target 'roslaunch' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['roslaunch', 'python3-paramiko', 'python3-pycrypto']
 
ERROR: Required build target 'core-image-elphel393' has no buildable providers.
 
Missing or unbuildable dependency chain was: ['core-image-elphel393', 'roslaunch', 'python3-paramiko', 'python3-pycrypto']</font>
 
 
 
* Successful build:
 
** IMAGE_INSTALL += "roslaunch"
 
 
 
<font size='1'>NOTE: Resolving any missing task queue dependencies
 
ERROR: Nothing RPROVIDES 'python3-pycrypto' (but /home/oleg/GIT/elphel393_rocko_clean_install/meta/meta-ros/recipes-devtools/python/python3-paramiko_1.16.0.bb RDEPENDS on or otherwise requires it)
 
NOTE: Runtime target 'python3-pycrypto' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['python3-pycrypto']
 
NOTE: Runtime target 'python3-paramiko' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['python3-paramiko', 'python3-pycrypto']
 
NOTE: Runtime target 'roslaunch' is unbuildable, removing...
 
Missing or unbuildable dependency chain was: ['roslaunch', 'python3-paramiko', 'python3-pycrypto']
 
ERROR: Required build target 'core-image-elphel393' has no buildable providers.
 
Missing or unbuildable dependency chain was: ['core-image-elphel393', 'roslaunch', 'python3-paramiko', 'python3-pycrypto']</font>
 
 
 
 
 
* Error 2:
 
** <font color='red'>Seems like '''rostopic''' causes:</font>
 
<font size='1'>ERROR: python-imaging-1.1.7-r5 do_package_qa: QA Issue: python-imaging: The compile log indicates that host include and/or library paths were used.
 
          Please check the log '/home/oleg/GIT/elphel393_rocko_clean_install/poky/build/tmp/work/cortexa9-neon-poky-linux-gnueabi/python-imaging/1.1.7-r5/temp/log.do_compile' for more information. [compile- host-path]
 
ERROR: python-imaging-1.1.7-r5 do_package_qa: QA run found fatal errors. Please consider fixing them.
 
ERROR: python-imaging-1.1.7-r5 do_package_qa: Function failed: do_package_qa
 
ERROR: Logfile of failure stored in: /home/oleg/GIT/elphel393_rocko_clean_install/poky/build/tmp/work/cortexa9-neon-poky-linux-gnueabi/python-imaging/1.1.7-r5/temp/log.do_package_qa.19425
 
ERROR: Task (/home/oleg/GIT/elphel393_rocko_clean_install/meta/meta-openembedded/meta-python/recipes-devtools/python/python-imaging_1.1.7.bb:do_package_qa) failed with exit code '1'</font>
 
 
potential links:
 
  https://github.com/intel-aero/meta-intel-aero/issues/81
 
  https://github.com/bmwcarit/meta-ros/issues/395
 
 
 
removed python3-imaging from '''rosbag''' - everything builds but then not really working.
 
 
 
with '''ROS_USE_PYTHON3 = "yes"''' stopped at finding an appropriate '''python-pycrypto''' lib
 
 
 
===Work===
 
* <font color='red'>'''Won't work'''</font>
 
 
 
** There's no '''rosrun''' (does not exist?)
 
 
 
** SSH session 1:
 
*** Add to /etc/hosts:
 
127.0.0.1 elphel393.localdomain elphel393
 
*** Export vars:
 
export ROS_ROOT=/opt/ros
 
export ROS_DISTRO=indigo
 
export ROS_PACKAGE_PATH=/opt/ros/indigo/share
 
export PATH=$PATH:/opt/ros/indigo/bin
 
export LD_LIBRARY_PATH=/opt/ros/indigo/lib
 
export PYTHONPATH=/opt/ros/indigo/lib/python2.7/site-packages
 
export ROS_MASTER_URI=http://localhost:11311
 
export CMAKE_PREFIX_PATH=/opt/ros/indigo
 
touch /opt/ros/indigo/.catkin
 
*** Roscore
 
roscore
 
 
 
 
 
** SSH session 2:
 
root@elphel393:~# rosnode list
 
  <font size='1'>/rosout</font>
 
root@elphel393:~# rospack list
 
  <font size='1'>cpp_common /opt/ros/indigo/share/cpp_common
 
  genmsg /opt/ros/indigo/share/genmsg
 
  genpy /opt/ros/indigo/share/genpy
 
  rosbag /opt/ros/indigo/share/rosbag
 
  rosbag_storage /opt/ros/indigo/share/rosbag_storage
 
  rosclean /opt/ros/indigo/share/rosclean
 
  rosconsole /opt/ros/indigo/share/rosconsole
 
  roscpp /opt/ros/indigo/share/roscpp
 
  roscpp_serialization /opt/ros/indigo/share/roscpp_serialization
 
  roscpp_tutorials /opt/ros/indigo/share/roscpp_tutorials
 
  rosgraph /opt/ros/indigo/share/rosgraph
 
  rosgraph_msgs /opt/ros/indigo/share/rosgraph_msgs
 
  roslaunch /opt/ros/indigo/share/roslaunch
 
  roslib /opt/ros/indigo/share/roslib
 
  roslz4 /opt/ros/indigo/share/roslz4
 
  rosmaster /opt/ros/indigo/share/rosmaster
 
  rosnode /opt/ros/indigo/share/rosnode
 
  rosout /opt/ros/indigo/share/rosout
 
  rospack /opt/ros/indigo/share/rospack
 
  rosparam /opt/ros/indigo/share/rosparam
 
  rospy /opt/ros/indigo/share/rospy
 
  rospy_tutorials /opt/ros/indigo/share/rospy_tutorials
 
  rostime /opt/ros/indigo/share/rostime
 
  rostopic /opt/ros/indigo/share/rostopic
 
  std_msgs /opt/ros/indigo/share/std_msgs
 
  topic_tools /opt/ros/indigo/share/topic_tools
 
  xmlrpcpp /opt/ros/indigo/share/xmlrpcpp</font>
 

Latest revision as of 16:00, 3 January 2019

About

Use ROS2 in Elphel single or multi-camera systems. The cameras are 10393 system boards based on Xilinx Zynq, ARM.

Goals

Notes:

  • Controlling and initializing of multi-camera systems is already implemented using PHP API (autocampars.php), Python and lighttpd.
  • Using ROS2 is intended to simplify/standardize the above.
  • Using ROS2 is intended to make cameras compatible with other hardware supported by ROS1/2.

Having ROS2 cross-compiled and installed on each camera:

  • Initialize cameras in a pre-defined multi-camera system - sync and sequence critical init
  • Control multiple cameras from any camera of the system - parameters, recording
  • Control multiple cameras from a PC (with ROS2 for PC installed).
  • Control multiple cameras from a network device (w/o ROS2 installed, but with a browser) - by accessing a web server running on a camera interfaced with ROS2 of the camera. Can use nodejs or just lighttpd+php.

Status

Development

News

  • [2019/01/03] Updated the cross-compiled version from ardent to bouncy. PC was already at bouncy because rclnodejs will work with bouncy only (not yet compatible with crystal).

Updated because bouncy would not 'see' ardent nodes & services and vice versa.

Interfaces

ROS2 nodes communicate over:

  • 1 GigE LAN or (possibly) wifi (camera1-camera2..N, pc-camera1..N, pc1-pc2..M)
  • within a single device

Notes:

  • image sensors, IMS (or GPS & IMU), any other sensors are attached to cameras via a custom interface or USB, with appropriate driver support.
  • normally cameras in the system are synced with a custom trigger cable - this is setup over network
  • any device attached to PC?

ROS2 on Zynq

Installation

TODO: Include meta-ros.git in elphel393 build system.

DONE: included a forked version okdzhimiev/meta-ros

Include meta-ros to elphel393

  • Add path to bblayers.conf
  • Add to "IMAGE_INSTALL_append" of core-image-elphel393.bb:
packagegroup-ros2-world \

Notes

  • Cross-compilation for ARM
  • ROS2 for python populates /usr/lib/python3.5/site-packages/ so python scripts can live anywhere.
  • For command line apps, like ros2 ..., if AMENT_PREFIX_PATH is not set then:
OSError: Environment variable 'AMENT_PREFIX_PATH' is not set or empty
  • Useful commands (command line):
export AMENT_PREFIX_PATH=/usr
ros2 pkg list
ros2 node list
ros2 srv list
ros2 srv show std_srvs/Trigger
ros2 msg list
ros2 msg show std_msgs/String

Demos

talker-listener cpp

# terminal 1:
export AMENT_PREFIX_PATH=/usr
ros2 run demo_nodes_cpp talker

# terminal 2:
export AMENT_PREFIX_PATH=/usr
ros2 run demo_nodes_cpp listener

Workflow

  • Use example recipes from meta-ros.git
  • bitbake package-name, check output and logs in the poky build tree
  • List package in core-image-elphel393.bb's IMAGE_INSTALL_append

TODO:

  • Add target-scp and an example empty recipe

ROS2 on PC

Installation

Notes

  • Switched to installing from a fat archive
  • Terminal setup:
source /path/setup.bash

Workflow

  • Create a workspace
  • Create some packages inside or clone - they have a vcs tool to clone all repos from a text file.
  • Install colcon
  • Then build with colcon
  • New packages will not get installed anywhere. They live in their folders.
  • To use a package:
source ~/ros2_ws/some-package/install/setup.bash
ros2 pkg list
then run anything in this terminal
  • Python scripts can live anywhere - just run them from that sourced terminal

ROS2 in Docker

docker pull osrf/ros2:bouncy-desktop
docker run -i -t osrf/ros2:bouncy-desktop 
No network, no colcon, no ament...

ROS2 General Notes

Notes

  • SROS is Secure ROS or something

Useful links

  • Ament tutorial - build system for new packages
    • works and supported in meta-ros
    • will not work for PC because repo hashes moved on?
  • Colcon tutorial - newest build system for new packages
    • works for PC, even in 16.04
    • not supported in meta-ros (as of 2018/12/07)
    • colcon docs

Networking:

... 
if you are concerned about latency, like for soft real-time, you can basically tune DDS to be just a UDP blaster. In another scenario you might need something that behaves like TCP, but needs to be more 
tolerant to long dropouts, and with DDS all of these things can be controlled by changing the QoS parameters.
...

ROS2 Services:

Reference ROS repos

ROS1

Won't build. More info.