Plan

The goal of this is to generate an OpenSource equivalent to something like the BearTooth, or the Gotenna.

Parts

• $5 PI Zero

• $8 USB Hub PI Zero HAT

• $10 USB Hub PI Zero HAT

• $7 Realtek 8188CU dongle

• $12 Realtek dongle

• $12 LiPO charger

• $20 LiPO charger

• $10 LiPO 1300 mAh battery
• $15 LiPO 2500 mAh battery
• $20 LiPO 4400 mAh battery

• $30 LiPO 6000 mAh battery

• $125 YARD Stick One + ANT700

Design

The Jedi Firewall

Prepare an SD card, following the PI Zero USB Ethernet Guide.

Now we have a PI Zero that “looks like” an Ethernet interface for any Marshmallow Android device

This:

• Avoids chipset adhoc limitations and packet filtering in Android that makes meshing difficult in newer devices.
• Provides a physical cable for
  • No setup required
  • Secure connection
  • Charging the Android device

The PI Zero will:

• Act as a stateful VPN and media firewall
  • Gives out a DHCP address on a 192.168.1.0/24 private network through the RNDIS interface over USB.
  • Acts as a NATting firewall protecting that private segment
  • Use zeroconf on the wlan0 interface
    • IPv4 RFC3927 zeroconf [169.254.0.0/16] with avahi-autoipd
    • IPv6 link-local
• Has three USB ports for devices:
  • One required RTL-8188CU dongle for the ad-hoc 802.11 mesh
  • Two optional USB ports:
    • Two half-duplex YARD Stick One SDRs for full-duplex wide-area sub-1Ghz gnuradio
    • Bluetooth dongle for a Bluetooth PAN, and/or Wifi dongle for an instant AP instead of using USB ethernet to Android device
• Runs the linux daemons needed for communication:
  • olsrd for Wifi mesh
  • tinc daemon for meshed VPN
  • RFC5766 TURN server for WebRTC
  • ipfs daemon for secure neighbor discovery.
    • share zeroconf address
    • share tinc eliptical key to trusted neighbors
    • share TURN login credentials

The Jedi Internet Gateway

Prepare an SD card, configuring linux to RNDIS client tether on the USB interface to a cellphone.

Now we have a PI Zero that runs as an internet gateway for the mesh.

The USB cable makes it easy for an operator to provide connectivity for their team.

A powered USB On-The-Go (OTG) cable can let the phone charge while providing the USB tether.

The Jedi USB Battery

Even lightsabers need a power source.

This project conceals nicely as a USB battery, the size varies based on capacity of the LiPO batteries used.

The Jedi Android Applications

• JedIPFS as a service to join the private network
• JediMap to announce location and view trusted IPFS neighbors
• JediChat to securely chat WebRTC data channel with trusted neighbors
• JediCall to securely call WebRTC with trusted neighbors