A short presentation on OpenWrt

1. Internet of things
with routers
Tavish Naruka
BaseApp Systems

2. why
● cheap, off the shelf
● familiar software
● connectivity
● extensible

3. use cases
● wireless gateway/router
○ wifi stations/mesh apart from ap
○ other wireless on USB etc.
○ one off mod ↓

4. modules
● custom boards around SoMs
● same software, expanded peripherals
● serial, USB, SPI, I2C, i2s, GPIOs

5. OpenWrt
● customizable linux distribution for space constrained
devices
● ‘flashable’ f/w for supported devices
● image is kernel+squashfs+jffs2
● based on buildroot/uClibc
● Many system programs are provided as busybox
symlinks

6. OpenWrt
● based on http://buildroot.uclibc.org/
● easy to modify text based config(UCI)
● example:
config 'wifi-iface'
option 'device' radio0
option 'network''lan'
option 'mode' 'ap'
option 'ssid' 'MyWifiAP'
option 'encryption' 'psk2'
option 'key' 'secretkey'
● tools/configs available for:
○ firewall, dhcp, networks, wifi, ssh,
system(ntp, LEDs)

7. flash layout
Tools: Binwalk and FMK(firmware mod kit)
A typical router

8. Simple single file c code
.
|-- Makefile -- openwrt makefile
`-- src
|-- lpty.c
`-- Makefile -- code makefile
Code makefile is:
sample package

9. projects
● Freifunk - community wireless, B.A.T.M.A.N. mesh, porta2030
● Fon - router/internet vendor, Openmesh, ISP routers etc.
● Support for raspi, beaglebone, avr32, etc.
● Arduino yun mcu+linux running SoC
● Hak5 wifi pineapple - pentesting
we-io
vocore

10. fin
github.com/ntavish
ntavish.in

11. ● Delhi open hardware http://tinyurl.com/delhioh
● Delhi makers http://delhimakers.org
Also, Vivek Iyyer and me are going to do some experimentation with EEG, and
we’ll build some Openbci kits, at:
Ardubotics Makerspace, run by Himanshu Bablani
(near Qutab Minar metro station)
People are welcome to join, or start something else too.
Similar groups