Cross-compilation rtt_ros_integration on Raspberry Pi 3

[MatheusPinto]

Hello,

For about 1 month, I am trying to make a cross-compile of a application from rtt_ros_integration on Ubuntu 16.04 to a Raspberry Pi 3 running Ubuntu Mate Xenial. After several trial and error, I finally achieve to create the file that can be executed on Raspberry Pi 3. The code was created with the base from here: #118. However, when the program go to rtt_ros::import("rtt_std_msgs"), the follow error is launched:

0.660 [ ERROR  ][ROSService::import("rtt_std_msgs")] No paths in the ROS_PACKAGE_PATH environment variable! Could not load ROS package "rtt_std_msgs"
Segmentation fault

The "rtt_std_msgs" package is not founded for application. knowing this, I'm sure I'll have been able to do the cross compilation of rtt_ros_integration. Could any developer help me?

[mvukov]

There is a simple fact, but not immediately obvious. When you compile orocos and friends, you must copy the install space to the board to exactly the same path (at least I do that, and that was the case about ~2 years ago). So, if your install space path on the host is:

/home/user/my_ws/install

then you have to copy the install space to that exact path on a rpi3 -- this is related to how OROCOS component/typekit loader works.

Once you copy the install space, do

source /home/user/my_ws/install/setup.sh

and you are ready to go: run the deployer and execute your scripts.