OpenWrt

Compile

• https://github.com/openwrt/openwrt
• no need to run it as root
• git clone:

branch openwrt-18.06: git clone -b openwrt-18.06 https://github.com/openwrt/openwrt.git
branch chaos_calmer is legacy: git clone -b chaos_calmer https://github.com/openwrt/openwrt.git

• update

cd openwrt          //enter into openwrt folder
./scripts/feeds update -a     // update install package
./scripts/feeds install -a      //install updates

• make menuconfig
• Setup for MicroSD card & IOT Device mode or IOT gateway modes

Kernel modules    ---> 
 Other modules    ---> 
   <*> kmod-sdhci-mt7620 

• Make it - make V=s
• Find the firmware - openwrt/bin/ramips/openwrt-ramips-mt7628-mt7628-squashfs-sysupgrade.bin
• IPK packages - openwrt/ bin/ramips/packages/
• Firmware could be updated via LUCI webpage

Build and Use Toolchain

• in menuconfig, tick option "Build the OpenWrt based Toolchain"
• Toolchain can be found at "/bin/ramips/OpenWrt-Toolchain-ramips-mt7628_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-i686.tar.bz2"
• Install toolchain: sudo tar -jxvf ./bin/ramips/OpenWrt-Toolchain-ramips-mt7628_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-i686.tar.bz2 -C /opt/

C application

• Compile use mipsel-openwrt-linux-gcc
• mipsel-openwrt-linux-gcc hello_world.c -o hello_world

Run the complied application

• chmod +x /tmp/hello_world //add executable rights
• /tmp/hello_world //run“hello_world”application

IPK Application

• Save src file at ./package/utils
• In menuconfig -> Utilities , add this package

Compile

• cd ./package/utils //enter into package/utils folder
• mkdir hello_world //make“hello_world” folder for source code
• cd hello_world
• mkdir src //make src folder for source code
• nano src/hello_world.c //create hello_world.c file in src
• nano src/Makefile // add a new Makefile
• make menuconfig
• Utilities --->

<M> hello_world.................... Hello world -prints a hello world message 

• make V=s
• find installation file at openwrt/ bin/ramips/packages/base/hello_world_1.0_ramips_24kec.ipk

Install

• opkg install /tmp/usbutils_007-1_ramips_24kec.ipk

Applications

• 4G network card: kmod-mii, kmod-usb-net, kmod-usb-wdm, kmod-usb-net-qmi-wwan, uqmi
• USB file system: ntfs-3g, kmod-fs-ext4, kmod-fs-vfat
• Audio play: kmod-usb-audio, madplay-alsa
• Audio Misc: zlib, libffi, libattr, libpthread, glib2, libflac, libmad, libcurl, libogg, libvorbisidec, mpd-mini
• libmpdclient, mpc
• USB webcamera: libjpeg, mjpg-streamer
• Web SIP Call: zlib, libopenssl, libpthread, libre, librem, baresip, kmod-sound-core, kmod-usb-audio, librt, alsa-lib, baresip-mod-alsa

Usage

• 

  Set lanuage and UI style

• 

  bridge the network, add Vlan2, Vlan2 is already setup in this firmware

• 

  Set Static network environment, IP address - 192.168.1.120, gateway&DNS - 192.168.1.1, netmask - 255.255.255.0

• 

  diagnostic network

• 

  Completed turn off Vlan2, set Vlan1 as follow, now the router can be visited via the main network

• 

  Error "returned 127" can be ignore when install packages.

• No need to setup anything for firewall
• Apps list can check on this page category: Linux
• Use Transmission
• change mode to STA-client -> wifi -> find SSID:openwrt -> edit -> mode -> client -> scan -> join network -> enter password -> save

Luci

Programming tutorial in chinese

• 1.http://www.right.com.cn/forum/thread-183560-1-1.html
• 2.http://www.tuicool.com/articles/zaUNfy
• 3.http://blog.chinaunix.net/uid-23780428-id-4367351.html
• 4.http://blog.csdn.net/lvshaorong/article/details/53939138

Relvant connector can check this page: feeds/luci/modules/luci-base/luasrc/