Book Image

Yocto for Raspberry Pi

By : TEXIER Pierre-Jean, Petter Mabäcker
Book Image

Yocto for Raspberry Pi

By: TEXIER Pierre-Jean, Petter Mabäcker

Overview of this book

The Yocto Project is a Linux Foundation workgroup, which produces tools (SDK) and processes (configuration, compilation, installation) that will enable the creation of Linux distributions for embedded software, independent of the architecture of embedded software (Raspberry Pi, i.MX6, and so on). It is a powerful build system that allows you to master your personal or professional development. This book presents you with the configuration of the Yocto Framework for the Raspberry Pi, allowing you to create amazing and innovative projects using the Yocto/ OpenEmbedded eco-system. It starts with the basic introduction of Yocto's build system, and takes you through the setup and deployment steps for Yocto. It then helps you to develop an understanding of Bitbake (the task scheduler), and learn how to create a basic recipe through a GPIO application example. You can then explore the different types of Yocto recipe elements (LICENSE, FILES, SRC_URI, and so on). Next, you will learn how to customize existing recipes in Yocto/OE layers and add layers to your custom environment (qt5 for example).
Table of Contents (18 chapters)
Yocto for Raspberry Pi
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
3
Mastering Baking with Hob and Toaster

Turning on/off the lamp from a smartphone


Our home automation project is nearly finished, but one important thing remains: we need to ensure that it's possible to control the light using a remote device, such as a smartphone. First of all, we need to check on the board whether the web server is present:

$ ps | grep server
295 root 2732 server.init

If the server for some reason hasn't auto-started, we can try to manually start it using this command:

$ /etc/init.d/server-packt-init start
starting Nodejs app: server.init... done.
root@raspberrypi2:~#    info  - socket.io started
listening on *:3344

If we manually perform some changes to the web server directly on the Raspberry Pi, we can restart the web server by using this command:

$ /etc/init.d/packt-server restart
stopping Nodejs app: server.init... stopped node (pid 295)
done.
starting Nodejs app: server.init... done.

Now, we can start the web browser on our smartphone and go to http://my_rpi_ipaddress:3344. You will see the same page that...