Link022: an open WiFi access point

Link022 is an open reference implementation and experimental platform for an OpenConfig and gNMI controlled WiFi access point.

The central part of Link022 is an gNMI agent that runs on a Linux host with WiFi capability. The agent turns the host into an gNMI capable wireless access point which can be configured using OpenConfig models.

• See gNMI Protocol documentation.
• See Openconfig documentation.

Getting Started

For documentation on installing a full demo system (with both a gNMI client and link022 access point) please see the full demo documentation which explains a fully complete system.

The following instructions will get you a Link022 AP on a Raspberry Pi device.

Prerequisites

Have a Raspberry Pi device set up. (Tested with Raspbian)

Install Golang on Raspberry Pi.

wget https://storage.googleapis.com/golang/go1.7.linux-armv6l.tar.gz
sudo tar -C /usr/local -xzf go1.7.linux-armv6l.tar.gz
export PATH=$PATH:/usr/local/go/bin

Install dependencies.

sudo apt-get install udhcpc bridge-utils hostapd git

Download Link022 agent

export GOPATH=$HOME/go
go get github.com/google/link022/agent

Download certificates

Download sample certificates from the demo directory. Or you can use your own cert.

Configuring network interfaces of Pi

Editing the file /etc/network/interfaces on Pi.

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

# Disable all WLAN interfaces.
auto wlan0
iface wlan0 inet static
    address 0.0.0.0

# Repeat for other WLAN interfaces.

Note: Reboot the device to make change take effect.

Running Link022 agent

export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin
sudo env PATH=$PATH agent -ca=<path to ca.crt> -cert=<path to server.crt> -key=<path to server.key> -eth_intf_name=<the eth interface> -wlan_intf_name=<the wlan interface for AP radio> -gnmi_port=<port number>

Note: Make sure the chosen wireless device supports AP mode and has enough capability.

Disclaimer

• This is not an official Google product.
• See how to contribute.