ros::init() before creating the first NodeHandle

[osrf-migration]

Original report (archived issue) by Brian Bingham (Bitbucket: brian_bingham).

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Working in default branch. When I run roslaunch robotx_gazebo sandisland.launch, I get error...

#!bash
[FATAL] [1531350486.327760996]: You must call ros::init() before creating the first NodeHandle

...

Couldn't find an AF_INET address for []

If I edit the sandisland.launch file to use the world: "$(find robotx_gazebo)/worlds/sandisland.world
then the error goes away.

Ran out of time to chase this one to ground.

[osrf-migration]

Original comment by Brian Bingham (Bitbucket: brian_bingham).

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@kev-the-dev Could you see if you get a similar issue on your end?

[osrf-migration]

Original comment by Kevin Allen (Bitbucket: kev-the-dev).

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I can't reproduce this issue running off the current default branch. To see if it's some networking issue, try roslaunch gazebo_ros empty_world.launch ---screen

[osrf-migration]

Original comment by Brian Bingham (Bitbucket: brian_bingham).

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Thanks for checking.

Gazebo runs fine - as expected - just can't seem to example_course.world file. Will dig deeper...

[osrf-migration]

Original comment by Kevin Allen (Bitbucket: kev-the-dev).

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Hmm the difference with example_course may be that it has scan the code. I'd try updating ROS sudo apt upgrade and rebuilding the workspace

[osrf-migration]

Original comment by Brian Bingham (Bitbucket: brian_bingham).

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Have a bit more information. Seems that the following warning and error are both associated with the gazebo_ros_color plugin. If I leave that plugin within the light_buoy model.sdf file, I get this...

[ INFO] [1531414068.832072458, 2.002000000]: Command timeout!
Warning [parser.cc:437] Converting a deprecated SDF source[data-string].
[FATAL] [1531414069.166852757]: You must call ros::init() before creating the first NodeHandle
[ INFO] [1531414069.329668602, 2.501000000]: 0: 0.0414236 / 0.000165695

If I comment out that plugin from the model.sdf, then everything works as expected.

I attempted to add explicit ros::init to the plugin, but no joy.

Strange that the error can't be replicated.

[osrf-migration]

Original comment by Carlos Agüero (Bitbucket: caguero, GitHub: caguero).

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I cannot reproduce it either but just wondering if this might be a timing issue. One idea could be to move the lines:

nh_ = ros::NodeHandle(ns);
color_sub_ = nh_.subscribe(topic_name, 1, &GazeboRosColor::colorCallback, this);

from gazebo_ros_color.cc::Load() to gazebo_ros_color.cc::Init().

[osrf-migration]

Original comment by Brian Bingham (Bitbucket: brian_bingham).

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Damn - I think it was an update issue. I just did a system upgrade issue and it seems to have taken care of it.

Perhaps we should add some more specificity to your System Requirements to explicitly specify what updates need to be installed? Or, perhaps better just to make in implicit that the system needs to be at the most current.

I do still get the warning...

Warning [parser.cc:437] Converting a deprecated SDF source[data-string].

Perhaps related to this issue?

I'm not sure what the incompatible package was, but here is what now works on my system...

bsb@aku:~/vmrc_ws/src$ apt list --installed | grep gazebo

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

gazebo7/xenial,now 7.0.0+dfsg-2 amd64 [installed]
gazebo7-common/xenial,xenial,now 7.0.0+dfsg-2 all [installed,automatic]
gazebo7-plugin-base/xenial,now 7.0.0+dfsg-2 amd64 [installed,automatic]
libgazebo7/xenial,now 7.0.0+dfsg-2 amd64 [installed,automatic]
libgazebo7-dev/xenial,now 7.0.0+dfsg-2 amd64 [installed]
ros-kinetic-gazebo-dev/xenial,now 2.5.17-0xenial-20180607-142040-0800 amd64 [installed,automatic]
ros-kinetic-gazebo-msgs/xenial,now 2.5.17-0xenial-20180607-142015-0800 amd64 [installed,automatic]
ros-kinetic-gazebo-plugins/xenial,now 2.5.17-0xenial-20180607-142447-0800 amd64 [installed]
ros-kinetic-gazebo-ros/xenial,now 2.5.17-0xenial-20180607-142334-0800 amd64 [installed]
ros-kinetic-gazebo-ros-control/xenial,now 2.5.17-0xenial-20180607-143339-0800 amd64 [installed]
ros-kinetic-gazebo-ros-pkgs/xenial,now 2.5.17-0xenial-20180607-145241-0800 amd64 [installed]
ros-kinetic-hector-gazebo/xenial,now 0.5.0-0xenial-20180607-162110-0800 amd64 [installed]
ros-kinetic-hector-gazebo-plugins/xenial,now 0.5.0-0xenial-20180607-143740-0800 amd64 [installed]
ros-kinetic-hector-gazebo-thermal-camera/xenial,now 0.5.0-0xenial-20180607-152748-0800 amd64 [installed,automatic]
ros-kinetic-hector-gazebo-worlds/xenial,now 0.5.0-0xenial-20180607-145938-0800 amd64 [installed,automatic]

[osrf-migration]

Original comment by Brian Bingham (Bitbucket: brian_bingham).

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• changed state from "new" to "resolved"

May want to add documentation on having to do an update, but otherwise done.

[osrf-migration]

Original comment by Kevin Allen (Bitbucket: kev-the-dev).

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It was likely gazebo-ros-pkgs as discussed in this PR. I added a version requirement in PR#19