Connecting to multiple Tello drones

Problems:

• each Tello drone serves a separate access point (AP)
• currently there is no way to ask the drone to instead connect as client to another AP (since we cannot telnet or ssh into it)
• all Tello drones are configured to have an IP of 192.168.10.1

Solution:

• use multiple devices (e.g. USB WiFi dongles) to connect to each drone
• to resolve subnet and IP clash, use a docker container to connect each device to a target drone, then bi-directionally forward UDP channels for telemetry and video
• e.g. before: client wlan# (192.168.10.2:9000) <-> drone (192.168.10.1:8889)
• e.g. after: client docker0 (172.17.0.1:9000) <-> container eth0 (172.17.0.2:8889) <-socat-> container wlan# (192.168.10.2:8889) <-> drone (192.168.10.1:8889)
• NOTE: a similar UDP proxy needs to be setup for the video stream, although the server is running on the client rather than the drone

Requirements:

• docker
• pcregrep

Instructions:

• optional: add alias go=./go.py to ~/.bashrc, or replace go with ./go.py for commands below
• configure parameters: $ cp config.ini.dist config.ini and modify content accordingly
• build docker image: $ go build
• start docker container: $ go setup (see --help for overridding parameters)
• turn on drone
• configure docker container to connect to drone's WiFi and setup UDP relays: $ go connect
• connect driver to drone using IP given from output of above command
• teardown: $ go stop