Welcome to my first entry. As I would consider myself a drone hobbyist I was searching online to get myself a drone building set. I wanted to have a drone that I could program to do stuff based upon it's camera feed. For example feeding that into a Convolutional Neural Network. So as I was browsing I saw that these sets were usually pretty expensive and they never came with any instructions to build them. So I thought it might be fun to use a cheap toy drone that is controlled via an app and make that one programmable.
While recording I simply used all the functions the drone had and flew around so I could get a full picture of what packages would be sent. After I was done I opened the file in WireShark.
After some inspection I concluded that the videostream is being sent via a TCP stream on port 8888 and that controls are being sent via UDP to port 8080 on the drone. I also noticed that a simple data string of hex numbers was used to control every part of the drone. With the help of live package inspection by using
"Arm" means the start of the blades, "disarm" the initiation of the landing sequence and "stop" the momentary stop of the blades.
These were my notes:
App sends every 50ms a package -> If no control is used the IDLE package is sent
Maximum of most pairs are their IDLE value times 2.
Data: ff08 7e3f 403f 9010 1000 0b (Standard-Calibration IDLE)
Names: abcd efgh ijkl mnop qrst uv
ef -> THROTTLE: Counts up for higher, counts down for lower ij -> PITCH: Counts down for forward, counts up for backward
kl -> ROLL: Counts up for right, counts down for left
gh -> YAW: Counts up for right, counts down for left
mn: Counts up for right yaw calibration, down for left yaw calibration
op: Counts up for forward calibration, down for backward calibration
qr: Counts up for right roll calibration, down for left roll calibration
s: sends arm:4 disarm:8 stop:a gravity sensor:1
t: 30%:0 60%:1 100%:2
Extra bits that simply count and make my life harder:
Example: If "ef" counts up to fly the drone higher, "uv" counts down by the same value-1.
THROTTLE: Counts down for higher, counts up for lower
YAW: Counts up for left counts down for right turn
PITCH: Counts up for forward, counts down for backwards
ROLL: Counts down for right, counts up for left
CALIBRATION: Counts up for left yaw, left roll and downwards throttle calibration
Some examples after I stopped testing:
THROTTLE: HIGHER: (ef:7e -> +7e -> ef:fc | uv:07 -> -(7e-1) -> +82 -> uv:89) LOWER: (ef:7e -> -7e -> ef:00 | uv:07 -> +(7e+0) -> +7e -> uv:85)
YAW: LEFT: (gh:3f -> -3f -> gh:00 | uv:07 -> +(3f+2) -> +41 -> uv:48) RIGHT: (gh:3f -> +3f -> gh:7e | uv:07 -> -(3f+2) -> +c3 -> uv:ca)
PITCH: FORWD: (ij:40 -> -3f -> ij:01 | uv:07 -> +(3f+0) -> +3f -> uv:46) BACKW: (ij:40 -> +3f -> ij:7f | uv:07 -> -(3f+1) -> -40 -> uv:c8)
uv in addition with s-Commands:
DISARM: -> -80(hex)
ARM: -> +B0(hex)
STOP: -> -A0(hex
I couldn't figure out the controls exactly so for the rest of the project I simply used prerecorded data packets for each direction.