Xbox One Controller Serial Number

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Physical layer

The dongle itself is sending out data using 802.11a (5 GHz WiFi) with OFDM and 6 Mbit/s data rate:

The controller seems to respond with 802.11n (also in the 5 GHz band and with OFDM) with an MCS index of 0 and 6.5 Mbit/s data rate:

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Channel 44 was used in above examples, but when I first started the sniffing, I saw traffic on channels 36, 40 and 48 as well. The driver probably chooses the channel randomly or depending on the current traffic situation. The controller seems to scan each channel.

Beacons

The dongle features a standard Access Point, so it is constantly sending out Beacon frames:

Most noticable here is the vendor specific information element (with tag number 221). There is even more data appended to that tag that is not recognized by Wireshark. The whole tag is:

Connecting

Every single frame, starting from here, is immediately followed by a standard ACK frame.

As I had already paired both devices prior to starting the analysis, I didn't manage to capture the actual pairing process and I have no idea how to »unpair« them. Therefore, I will start with the connecting phase. This one is pretty straight forward.

First the controller sends an association request to the dongle:

The information elements here don't really make sense, it seems like there are just 10 zero bytes appended to the end of the packet.

The dongle responds with a association response:

The association ID 0x0f00 seems to be constant (at least with the one controller I have available for testing). The information elements are the same as in the request.

Probing

After association, there is a probe request:

and a probe response:

The »management« part of the frame is exactly the same as in the beacon frame.

»Null« data frames

After being connected the controller and the dongle seem to be exchanging »QoS Null function« frames continously with the controller sending the frame first and the dongle responding immediately. After the response, the controller seems to wait for exactly 8 milliseconds before sending the next frame.

Those frame look like the following:

The controller, however, has the QoS Control flag set to 0x0001 instead (meaning »background« priority).

About 250 »QoS Null function« frames are exchanged within one second.

Actual controller input data

When you actually do something with the controller (e.g. pressing buttons or moving the joysticks), the controller sends a »QoS Data« frame.

The rest of the frame is interpreted as Logical Link Control and other protocols by Wireshark which doesn't make sense in this case. It actually consist of the button map and analog input values and looks like the following:

Broken down:

  • 20 00: seems like a command / status flag (see below) and is constant for all input data frames; I will call it »command« field
  • 03: kind of a counter as it increases with every action
  • 0e: number of bytes that follow (14 bytes)
  • 00 00: button map (in this case no buttons were being pressed), with the following bit mapping (bit 0 is LSB, bit 15 is MSB)
    • 0: DPAD up
    • 1: DPAD down
    • 2: DPAD left
    • 3: DPAD right
    • 4: LB
    • 5: RB
    • 6: left analog stick pressing
    • 7: right analog stick pressing
    • 8-9: unknown
    • 10: right button
    • 11: left buton
    • 12: A
    • 13: B
    • 14: X
    • 15: Y
  • 00 00: LT position (not pressed at all)
  • 00 00: RT position
  • 4f 03 9c 02: left joystick position (X and Y coordinates)
  • b4 ff 26 ff: right joystick position
Serial

Other data frames

About 500 milliseconds after the connection between the controller and the dongle has been established (and after about 125 »QoS Null function« frames have been passed back and forth), there are »QoS Data« frames thate are constructed similar to those that contain the input data. They have other values in the command field (like 20 00 for the input data) and the position of the »number of bytes that follow« field (marked with * below) seems to be varying depending on the command.

Following are the commands that I recognized so far (in the order they appeared):

ControllerDonglePayload
02 20 01 1c*→7e ed 80 1f 6d 53 00 00 5e 04 dd 02 02 00 03 00
37 09 06 00 02 01 01 00 01 00 01 00
←04 20 01 00*
04 f0 01 3a* d6 01→10 00 01 00 00 00 00 00 00 00 00 00 00 00 d6 00
97 00 16 00 37 00 38 00 41 00 49 00 66 00 00 00
00 00 00 00 00 00 08 01 00 00 00 01 00 01 00 01
00 02 00 01 00 03 00 02 00 00
←01 20 01 09*00 04 20 3a 00 00 00 9c 00
04 a0 01 ba 00 3a*→02 00 01 00 02 00 02 00 02 00 03 00 00 08 01 02
03 04 06 07 0c 1e 07 01 04 05 06 0a 0c 1e 01 1a
00 57 69 6e 64 6f 77 73 2e 58 62 6f 78 2e 2e 49
6e 70 75 74 2e 47 61 6d 65 701
04 a0 01 ba 00 74*2→61 64 03 56 ff 76 97 fd 9b 81 45 ad 45 b6 45 bb
a5 26 d6 2c 40 2e 08 df 07 e1 45 a5 ab a3 12 7a
f1 97 b5 e7 1f f3 b8 86 73 e9 40 a9 f8 2f 21 26
3a cf b7 02 17 00 20 0e 00 01
04 a0 01 28* ae 01→00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 17 00 09 3c 00 01 00 08 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
←04 20 01 09*00 04 20 d6 00 00 00 00 00
04 20 01 00* d6 01→
←05 20 02 01*00
←0a 20 03 03*00 01 14
20 00 01 0e*→00 00 00 00 00 00 c5 01 45 fd bc 02 50 023
03 20 01 04*→87 01 00 00
←1e 30 04 01*00
1e 20 01 22*→00 00 17 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00
01 20 04 09*→ 400 1e 30 00 00 00 00 00 00
←1e 30 05 01*01
1e f0 02 3a* 8a 02→01 00 01 00 12 00 00 00 02 00 00 00 00 00 03 00
00 00 00 00 04 00 00 00 00 00 10 00 01 00 00 00
11 00 00 00 00 00 20 00 00 00 00 00 21 00 00 00
00 00 22 00 00 00 00 00 23 00
01 20 05 09*→00 1e 30 00 00 00 00 00 00
←01 20 02 09*00 1e 20 3a 00 00 00 d0 00
1e a0 02 ba 00 3a*→00 00 00 00 24 00 00 00 00 00 25 00 00 00 00 00
26 00 00 00 00 00 27 00 00 00 00 00 28 00 01 00
00 00 29 00 00 00 00 00 2a 00 00 00 00 00 2b 00
03 00 00 00 2c 00 03 00 00 00
1e a0 02 ba 00 74*2→2d 00 03 00 00 00 2e 00 00 00 00 00 2f 00 01 00
00 00 40 00 00 00 00 00 41 00 00 00 00 00 42 00
00 00 00 00 43 00 00 00 00 00 50 00 d9 06 00 00
51 00 01 00 00 00 52 00 01 00
1e a0 02 3a* ae 01→00 00 53 00 06 00 00 00 54 00 03 00 00 00 55 00
0c 00 00 00 56 00 03 00 00 00 57 00 07 00 00 00
58 00 07 00 00 00 59 00 04 00 00 00 60 00 00 00
00 00 64 00 00 00 00 00 61 00
1e b0 02 22* e8 01→01 00 00 00 65 00 2a 01 00 00 62 00 00 00 00 00
66 00 00 00 00 00 63 00 00 00 00 00 67 00 00 00
00 00
1e a0 02 00* 8a 02→
←1e 30 06 01*04
1e 20 03 10*→04 00 30 32 39 38 30 30 38 31 31 38 35 36 32 355
01 20 06 09*→00 1e 30 00 00 00 00 00 00
←06 20 01 02*01 00
09 00 07 09*→00 0f 00 00 00 00 ff 00 00
{:.widetable}

1 has »Windows.Xbox.Input.Gamep« (24 bytes) as ASCII in payload

2 7416 = 3416 / 2

3 actual input data

4 MAC address of destination has bit 1 cleared

5 has the serial number of the controller as ASCII in payload

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Overall, this seems to be something like a status protocol. The dongle can request certain status flags from the controller or send commands and the controller respons accordingly. Status messages are also sent without prior request.

Xbox One Controller Serial Number Location

Reserved frames

Apart from those undecipherable data frames, the devices sometimes exchange frames with frame control field set to 0x7000:

Example payload of such a frame: 70 05. All payloads start with 07 and have something like a 1-byte command field directy after where odd numbers seem to be request commands from the dongle to controller and even numbers are responses from the controller to the dongle; in this case 07 05 is a request from dongle to controller and the controller responds with 07 06 (command field + 1) and further payload.

Following are the commands I have recognized so far:

  • 70 05 →
    70 06 13 00 00 00 01 00 00 00 00 00 00 00 12 00
    00 00 00 00 00 00 00 00 00 00 ba 00 00 00 04 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 01 00 00 00 0c 00 00 00 00 00
    00 00 0c 00 00 00 00 00 00 00 00 00 00 00 bd 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 cb ff ff ff 16 00 00 00 04 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 (some bytes vary)
  • 07 07 01 00 → 70 08 00 01 03 03 0a
  • ? → 70 10 00 00 (without request)

Xbox One Controller Custom

Some of the responses are sent without prior request.