App store advanced topics Erle Robotics May 21, 2015 Contents 1 Installing an official ROS package 3 2 Compiling a ROS package from source 3 3 Creating an app from a ROS package 4 4 License 5 Getting WIFI in Snappy Ubuntu Core with Erle-Copter 2 May 21, 2015 1 INSTALLING AN OFFICIAL ROS PACKAGE Login into Erle-Brain and go to the trusty chroot where ROS is installed. Assuming that you’re connected through the miniUSB terminal (same could be done through WiFi, Ethernet, …): ssh ubuntu@192 . 1 6 8 . 7 . 2 # p a s s w o r d ” ubuntu ” ( E r l e R o b o t i c s ) ubuntu@localhost : ~ / t r u s t y $ ( E r l e R o b o t i c s ) ubuntu@localhost : ~ / t r u s t y $ cd t r u s t y ( E r l e R o b o t i c s ) ubuntu@localhost : ~ / t r u s t y $ sudo . / chroot . sh root@localhost : / Our Snappy images include an inner Trusty file system to simplify ROS installation and maintainance (Note: this will soon change into a formal Vivid installation as soon as packages become available). This inner file system allows you to easily install ROS packages using: root@localhost : / apt−get i n s t a l l ros−i n d i g o −<ros−package−name> For example, let’s install the serial ROS package from the build farm: root@localhost : / 2 apt−get i n s t a l l ros−i n d i g o −s e r i a l COMPILING A ROS PACKAGE FROM SOURCE Let’s assume you created a new ROS package (e.g.: ros_erle_takeoff_land) and you’d like to compile it natively. Here’s how you would do it: Getting WIFI in Snappy Ubuntu Core with Erle-Copter 3 May 21, 2015 # a s s u m i n g you a l r e a d y e n t e r e d t h e t r u s t y c h r o o t source / opt / r o s / i n d i g o / setup . bash # s e t u p ROS env . v a r i a b l e s mkdir −p c a t k i n _ w s / s r c cd c a t k i n _ w s / s r c catkin_init_workspace C r e a t i n g s y m l i n k ” / r o o t / c a t k i n _ w s / s r c / CMakeLists . t x t ” p o i n t i n g to ” / opt / r o g i t c l o n e h t t p s : / / g i t h u b . com / e r l e r o b o t / r o s _ e r l e _ t a k e o f f _ l a n d Cloning into ’ r o s _ e r l e _ t a k e o f f _ l a n d ’ . . . remote : Counting o b j e c t s : 12 , done . remote : T o t a l 12 ( d e l t a 0 ) , reused 0 ( d e l t a 0 ) , pack−reused 12 Unpacking o b j e c t s : 100% ( 1 2 / 1 2 ) , done . Checking c o n n e c t i v i t y . . . done Great! now you’re all set to compile the package (whole trace available here): c a t k i n _ m a k e _ i s o l a t e d −− i n s t a l l # o r ” c a t k i n _ m a k e i n s t a l l ” Base path : / r o o t / c a t k i n _ w s Source space : / r o o t / c a t k i n _ w s / s r c B u i l d space : / r o o t / c a t k i n _ w s / b u i l d _ i s o l a t e d Devel space : / r o o t / c a t k i n _ w s / d e v e l _ i s o l a t e d I n s t a l l space : / r o o t / c a t k i n _ w s / i n s t a l l _ i s o l a t e d ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~ t r a v e r s i n g 1 packages i n t o p o l o g i c a l order : ~~ − ros_erle_takeoff_land ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The packages or cmake arguments have changed , f o r c i n g cmake i n v o c a t i o n ==> P r o c e s s i n g c a t k i n package : ’ ros_erle_takeoff_land ’ We used a catkin workspace for this example but you could also install the package at /opt/ros/indigo and make it available from the outer file system (Snappy Ubuntu Core). 3 CREATING AN APP FROM A ROS PACKAGE All right, so now we have a ROS package compiled and you want to ship this package as an app. How would you do this?: Getting WIFI in Snappy Ubuntu Core with Erle-Copter 4 May 21, 2015 # Compute t h e d e p e n d e n c i e s cd ~/ t r u s t y / sudo . / chroot . sh source / opt / r o s / i n d i g o / setup . bash # s e t u p ROS env . v a r i a b l e s cd / r o o t / c a t k i n _ w s ros2snap r o s _ e r l e _ t a k e o f f _ l a n d Computing dependencies f o r mavros Computing dependencies f o r mavros−e x t r a s After the dependencies have been computed and the snap structure created just create the app: e x i t # e x i t from t h e c h r o o t su # g e t s u p e r u s e r p r i v i l e g e s cd r o o t / c a t k i n _ w s # copy t h e p a c k a g e t o a more f r i e n d l y p l a c e cp −r i n s t a l l _ i s o l a t e d / / home / ubuntu / e x i t # g e t o u t o f t h e i n n e r c h r o o t t o c r e a t e t h e snap cd ~ sudo snappy b u i l d i n s t a l l _ i s o l a t e d A ros2snap_0.1_armhf.snap package should be created. The same process could be done outside of Erle-Brain using an external chroot in your development machine. Refer to these instructions. 4 LICENSE Unless specified, this content is licensed under the Creative Commons Attribution-NonComercial-Share Alike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. If you plan on using this material for commercial purposes get in touch with us at [email protected] Getting WIFI in Snappy Ubuntu Core with Erle-Copter 5
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