OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

This fork of OpenWRT is used as the build system for Cascoda's KNX-IoT Hub images. The changes to OpenWRT itself & associated are quite minimal - this is mostly for the convenience of building & releasing images

Development

To build your own firmware you need a GNU/Linux, BSD or MacOSX system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.6+ rsync subversion unzip which

Quickstart

1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

Fixing Build Errors

OpenWRT does not print out build logs by default, they need to be turned on manually after a build issue is detected. To do so, run the following command in the openwrt directory:

make V=s

Note that all logs for all packages are turned on. This makes the output much more difficult to parse than usual build logs. What works best for finding errors is searching for the name of the broken package or executable in a text editor, from the bottom of the file upwards.

Building for the Alfa Networks R36A

The R36A is the base platform onto which Cascoda's KNX IoT Hub is built. We provide a configuration file for building for this platform.

To make use of this files:

cp .config-r36a .config
make

• .config-r36a - vanilla Hub, with no Cascoda proprietary software.

Related Repositories

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

• LuCI Web Interface: Modern and modular interface to control the device via a web browser.

• OpenWrt Packages: Community repository of ported packages.

• OpenWrt Routing: Packages specifically focused on (mesh) routing.

• OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

• Quick Start Guide
• User Guide
• Developer Documentation
• Technical Reference

Support Community

• Forum: For usage, projects, discussions and hardware advise.
• Support Chat: Channel #openwrt on oftc.net.

Developer Community

• Bug Reports: Report bugs in OpenWrt
• Dev Mailing List: Send patches
• Dev Chat: Channel #openwrt-devel on oftc.net.

License

OpenWrt is licensed under GPL-2.0