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Rikuo Hasegawa

@sp4ghet

It works but I guess it doesn't convert using hardware acceleration or something

Rob Baynes

@rbaynes

yay, my clean install on demo-bot shows that I forgot to install a module. +1 for testing from a clean raspbian.

Bob Davis

@rwdavis513

FYI: https://wiki.openag.media.mit.edu/contributors/bob.davis/pfc_docker_troubleshooting

Bob Davis

@rwdavis513

@rbaynes have you built a new docker image for the latest release yet? If not, perhaps we could do so after the PR from Develop to Master

Rob Baynes

@rbaynes

no docker builds yet, i’m still verifying everything on develop works.

Bob Davis

@rwdavis513

@Spaghet I'm getting this warning when I run the new version. Any ideas? [WallTime: 1498064475.956594] Short read, received part of a message:

Rikuo Hasegawa

@sp4ghet

Do you get that consistently or at the beginning of a openag_brain boot

If it's consistently, Rob is working on it

if it's just at the beginning, that's normal and expected behaviour

Bob Davis

@rwdavis513

It's consistently...

Why is it normal to have it in the beginning? can it be fixed?

Rob Baynes

@rbaynes

the brain / serial communication will still work. we have a demo-bot running here since last Friday with that same issue. it prints consistently. It’s a sync issue in the serial protocol. I’m working on it.

Rikuo Hasegawa

@sp4ghet

Since Serial doesn't do any handshaking you might start listening to a message in the middle of it sending one, which means it will be a short read

and then starting on the second message it will be completely normal

but if it's constantly writing that warning, it's something that Rob is working on

Rob Baynes

@rbaynes

that is indeed what happens. but then some other stuff happens that is recoverable and constantly happens. rob is on it.

Bob Davis

@rwdavis513

@rbaynes @Spaghet Thank you!

@Spaghet Were you able to add checksum message verification and retries to the library? Is the checksum failing the reason for this warning message?

Rikuo Hasegawa

@sp4ghet

No checksums but it does retry

Bob Davis

@rwdavis513

ok. Once Rob fixes this first issue we'll want to add that

Bob Davis

@rwdavis513

@Spaghet Does the new protocol confirm the message was received as well?

Bob Davis

@rwdavis513

Here are some good thoughts on how to rst the Arduino code: https://stackoverflow.com/questions/780819/how-can-i-unit-test-arduino-code

https://github.com/mmurdoch/arduinounit/

Rob Baynes

@rbaynes

thanks @rwdavis513

Bob Davis

@rwdavis513

Here's another great option to assist with debugging Arduino code. it's the visual studio plugin: https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino

Bob Davis

@rwdavis513

Here's a good reference to help understand how the ros file system works and locate where files are installed:
http://wiki.ros.org/ROS/Tutorials/NavigatingTheFilesystem

Rikuo Hasegawa

@sp4ghet

Might as well do the whole tutorial while you're at it lol
http://wiki.ros.org/ROS/Tutorials

I wonder if there's docs on the inside of a package with its special directory exceptions like node/ and src/ and scripts/ and launch/

im sure gordon wrote something

Bob Davis

@rwdavis513

@Spaghet Do you know how to install individual ros packages? All I can find are installing them from the apt-get repo or building them from source.

Rikuo Hasegawa

@sp4ghet

Well, those would be the only ways to go about installing a ros package I assume

Add it's source code to catkin_ws/src or apt-get

You can get it's source and add it to src using rosinstall_generator, rosdep, and wstool

Bob Davis

@rwdavis513

oh ok...

Rikuo Hasegawa

@sp4ghet

What did you have in mind?

Bob Davis

@rwdavis513

I'm struggling with the usb_cam and trying to get it to work, so I can subscribe to the topic and read the images.

Rikuo Hasegawa

@sp4ghet

It would probably be

$ rosinstall_generator usb_cam --rosdistro indigo --deps --wet-only --exclude roslisp --tar >  ./usb_cam.rosinstall`
$ wstool merge -t ~/catkin_ws/src --merge-replace ./usb_cam.rosinstall
$ rosdep install --from-paths ~/catkin_ws/src --ignore-src --rosdistro indigo -y -r --os=debian:jessie
$ catkin_make

assuming you're in catkin_ws I guess for catkin_make

If the package is available on rodistro/rosdep then you could add it as a dependency in package.xml and you'd just have to run rosdep install

available on rosdistro ≒ apt-get

Bob Davis

@rwdavis513

thanks! How do you check if the package is available as a rosdependency?

Rikuo Hasegawa

@sp4ghet

it's in a github repo

uhh

https://github.com/ros/rosdistro/tree/master/rosdep

check if your thing is in there for debian

oh hang I've confused rosdep

rosdep is for external deps

Bob Davis

@rwdavis513

ok, no worries

Any ideas on this error? I'm trying to install "image_view"

-- Could not find the required component 'dynamic_reconfigure'. The following CMake error indicates that you either need to install the package with the same name or change your environment so that it can be found.
CMake Error at /home/pi/catkin_ws/devel/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by
  "dynamic_reconfigure" with any of the following names:

    dynamic_reconfigureConfig.cmake
    dynamic_reconfigure-config.cmake

  Add the installation prefix of "dynamic_reconfigure" to CMAKE_PREFIX_PATH
  or set "dynamic_reconfigure_DIR" to a directory containing one of the above
  files.  If "dynamic_reconfigure" provides a separate development package or
  SDK, be sure it has been installed.
Call Stack (most recent call first):
  image_view/CMakeLists.txt:4 (find_package)

After running command: catkin_make -DCATKIN_WHITELIST_PACKAGES="image_view"

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