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项目作者： aj-foster

项目描述 ：
Wireless monitor for FIRST Tech Challenge events.
高级语言： Elixir
项目地址: git://github.com/aj-foster/overseer.git
创建时间： 2019-10-22T00:31:43Z
项目社区：https://github.com/aj-foster/overseer
开源协议：
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FTC Overseer

Observe wireless activity during FTC matches.

Motivation

Certain wireless activities can disrupt the performance of robots participating in a FIRST Tech
Challenge match. This project, when paired with a Raspberry Pi and four USB wireless adapters with
certain abilities, observes wireless traffic related to teams currently playing a match to detect
undesired activity. By leveraging the FTC Live Scoring software, we can provide active alerts for
teams we know are currently playing rather than passively observing set frequencies.

What it Does

In broad strokes, this application does the following:

  • Connects to the FTC Live Scoring software running on the local network
  • Establishes a websocket connection to the /api/v2/stream endpoint
  • Listens for MATCH_START messages
  • Queries for the teams playing in the current match
  • Assigns each team to a wireless adapter
    • Each adapter performs a scan to find the channel upon which a team is operating
    • In case a team has multiple pairs of phones, the network with highest signal strength is used
  • Runs tshark to observe the wireless traffic related to the Robot Controller MAC address
  • Actively alerts if problematic traffic is detected
  • Stops all scans and tshark when the match ends

Display Screenshot

Console Screenshot

Setup

This project requires specialized hardware. Following is a broad outline of the setup process.

Raspberry Pi

This software was tested using a Raspberry Pi 3 B+. I recommend avoiding the Raspberry Pi 4 due to
potential wireless interference by the USB 3.0 ports. Equivalent Pi units with four USB ports can
work with a modified firmware image.

See the Software section below for more information about the firmware to use on the Pi.

Wireless Adapters

This project will use up to four wireless adapters, assigning one adapter to each team currently
playing in a match. Each adapter should have the following specs:

  • Dual-band, in case a team uses 5 Ghz wireless
  • Monitor mode, for looking at traffic not sent directly to the adapter

In testing, I used four Cisco/Linksys WUSB600N v2 adapters. Note that other versions may not have
monitor mode capability. Note: other adapters may require a modification of the firmware to
include additional drivers.

Because of the size of most adapters, you will likely want several short USB extension cables or a
USB hub with sufficient space between ports.

Software

This software is written in the Elixir language and utilizes the Nerves library to create a
bootable firmware for the Raspberry Pi. Firmware images can be downloaded from the GitHub releases
page. Burn it directly to an SD card using dd or a similar utility (instructions omitted — be
careful when writing to block devices!).

Usage

Startup: The application will automatically boot when the Raspberry Pi is powered up. A standard
keyboard and monitor can be used to interact with an interactive Elixir console. (Press enter to see
the prompt if log messages are obscuring it.)

Network: The application will start the Pi’s ethernet interface with DHCP enabled.

Adapters: The application will utilize any wireless adapters available during startup.

Scoring API: After application startup, we can configure the location (host) of the scoring API
and the current event code using the following in the interactive Elixir console:

  1. FTC.Overseer.Scorekeeper.set_api_host("http://10.0.0.2:8080")  # Scoring host address
  2. FTC.Overseer.Scorekeeper.set_event_code("2019flm4")  # Scoring event code

Web interface: Access the web interface of the application by going to port 4000 of the Pi’s
IP address, i.e. http://10.0.0.3:4000.