This document discusses using routers and Internet of Things devices running the OpenWrt operating system. It provides examples of OpenWrt configurations and projects using OpenWrt, such as community wireless networks. The document also mentions using OpenWrt on single board computers and developing code for OpenWrt packages.

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.
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