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serial2mqtt OpenWrt

Experimental OpenWrt package for the serial2mqtt project.

Do not worry, building an OpenWrt package is amazingly easy. There are two different way to build the package, here's how.

Traditional build

In this case you need to install some basic developments tools and libraries. These tools are part of your distribution and they could be already installed if you compiled anything before.

The SDK itself is a tar file, where most of the tools are pre-compiled. The Using the SDK is an introductionary how you do it. After that here's how you can build serial2mqtt (the example is about building serial2mqtt on OpenWrt 21.02.0rc1 on a ramips/mt7621 target):

[halfbakery BUILD]$ tar xfJ ~/Download/openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64.tar.xz
[halfbakery BUILD]$ cd openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64/
[halfbakery openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64]$ ./scripts/feeds update -a
...output...
[halfbakery openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64]$ git clone https://github.com/halfbakery/serial2mqtt-openwrt.git package/serial2mqtt
...output...
[halfbakery openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64]$ make defconfig
...output...
[halfbakery openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64]$ make package/serial2mqtt/compile
...output...
[halfbakery openwrt-sdk-21.02.0-rc1-ramips-mt7621_gcc-8.4.0_musl.Linux-x86_64]$ ls bin/packages/mipsel_24kc/base/
serial2mqtt_0.0-1_mipsel_24kc.ipk

Use an OpenWrt SDK docker container

This method is even easier. No need to install anything on the host system, just run the following commands:

$ mkdir openwrt_packages
[halfbakery BUILD]$ cd openwrt_packages
[halfbakery openwrt_packages]$ pwd
/home/halfbakery/BUILD/openwrt_packages
[halfbakery openwrt_packages]$ docker run --rm -v "$(pwd)":/home/build/openwrt/bin -it openwrtorg/sdk:ramips-mt7621-21.02-SNAPSHOT
...output...
...the following prompt comes from the container...
build@ad4880501358:~/openwrt$ ./scripts/feeds update -a
...output...
build@ad4880501358:~/openwrt$ git clone https://github.com/halfbakery/serial2mqtt-openwrt.git package/serial2mqtt
...output...
build@ad4880501358:~/openwrt$ make defconfig
...output...
build@ad4880501358:~/openwrt$ make package/serial2mqtt/compile
...output...
build@ad4880501358:~/openwrt$ $ exit
exit
...the following prompt comes from the host...
[halfbakery openwrt_packages]$ ls packages/mipsel_24kc/base/
serial2mqtt_0.0-1_mipsel_24kc.ipk

Of course you can use podman instead of docker if you like, but you have to add permission on the build directory to the container to put the results into (e.g. chown 777 openwrt_packages is an easy & lazy solution).