What's the internal USB port for? (the one behind the status LED)

[P0V]

The status LED light (the one that blinks green if all good) has a white cover that can be snapped out to reveal the LEDs behind it. Right next to those LEDs, there's a micro USB port. We tried to mess around with it (it required a custom-made/wrecked micro USB male plug), but we can't really tell what it's actually for. Yes, of course it's for testing or maintenance by DJI, but we can't really tell how to interact with it at the moment. We suspect there's some custom tool or application used in DJI factory that communicates with it.

The exact way to communicate with the external port was easy to figure out because we already have the DJI Assistant software and we can intercept the USB traffic, but with this one we don't have any information.

Anybody has some concrete information about it? Would be much appreciated.

Here's a picture from a YouTube video:

 

[DrPeppar]

That's the dikfer access point.


Sent from my iPhone using MavicPilots

 

[ThreeGs]

Nobody's going for it? Okay. I will. What's a... OH LOOK! A penny!

 

[DrPeppar]

Well I'm curious to what the port is for as well but I don't have my manual on me. It's gotta be in there.


Sent from my iPhone using MavicPilots

 

[Ender]

Hmm, i take it the obvious things like USB Networking or UART port have been ruled out ?!

Ender

 

[Mako79]

The P3 has an SSD slot for the camera on the gimbal board access photos+vids. It also has one for P3 Mainboard to accesses the 4Gig SD card that holds the raw flight data. It could be the same on the Mavic to access the raw flight data for analysis.

 

[duelingglove]

The P3 has an SSD slot for the camera on the gimbal board access photos+vids. It also has one for P3 Mainboard to accesses the 4Gig SD card that holds the raw flight data. It could be the same on the Mavic to access the raw flight data for analysis.

interesting

 

[singlag]

it should be connect to MO58ZDN, may be use for calibrate the ultrasound sensor

 

[grinder.1]

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Loved that movie

 

[Big Fil]

It could be just for internal troubleshooting or flashing some of the components. I work for a electronic test equipment manufacturer and often times our instruments will have internal ports for accessing stuff during production or return to factory boxes for troubleshooting/programming.

 

[Dronewerkz]

Prob DJI's version of a " Fetzer Valve"
-they can be reset with some 3&1 oil, ball bearings and small hammer.

 

[singlag]

This port goes to the Mavic's camera Ambarella SoC

It appears to have an RNDIS gadget enabled, but there is no DHCP server handing out IPs.
The IP range of the camera is unknown, likewise it is unknown if the interface is even puled up, or given an UP, *or* bridged to any other interfaces.

Does anyone else have other detail?

RNDIS network have dhcp server on .200 firmware, it set 192.168.42.3 on my windows 7
and drone side is 192.168.42.2, can access to ftp (same as wifi 192.168.2.1)

 

[singlag]

No.... this is a different port. This is the RNDIS on the 'dikfer' port, not the side USB port.

found something about usbnet from the A9S AmbaLink Linux/Ginkgo AMP Linux (wm220_0100_v02.00.55.69_20161215.pro.fw.sig/wm220_0100_v02.04.03.85_20161222_ca02.pro.fw.sig)

#!/bin/sh

echo "Add usb net $1"

ifconfig $1 192.168.1.3

if [ t"$1" == t"usb0" ]; then
arping -I $1 -A -c 10 -s 192.168.1.3 192.168.1.10 &
fi

 

[singlag]

Thanks... 192.168.1.3 worked. Seems my Mac was having some routing issues. I switched to my linux box and was able to telnet into the a9 and get a login prompt.

interesting, try to connect android from a9 by bridged 192.168.42., A9 may be in "whitelist" ?

 

[vk2fro]

Interesting - watching this for further findings

 

[D95GAS]

Would be interesting to see if the guys on the "other" forum who have reverse engineered the Mavic firmware are aware of this

 

[BerndM]

Darn, I wish you guys would use proper English and not some mysterious language from another planet.

 

[singlag]

Linux kernel version 3.10.62

Which address for the Android? You left off the final octet.

RNDIS = 192.168.42.2 (drone), 192.168.42.3(pc)
wifi mode = 192.168.2.1 (drone)

 

[singlag]

I’m in the process of making this user friendly... here’s the script to help you decrypt files off Mavic ftp server

GitHub - MAVProxyUser/DJI_ftpd_aes_unscramble: DJI has modified the GPL Busybox ftpd on Mavic, Spark, & Inspire 2 to include AES scrambling of downloaded files...

thx for the aes key
I try to run the busybox again, aes-finder (run on x86 host) still not found anything (ftp on arm is working, file can be transfter from x86 host)

 

[Blucenturion]

I'll say one thing for these nerds; they can spell, and use punctuation. That's quite unusual.