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Sony Headphone protocol

Basic communication protocol : RFCOMM

RFCOMM Payload

Start marker - 1B Data type - 1B Sequence number - 4B Payload size - 1B Payload Checksum - 1B End marker - 1B
Always > One of the following Almost always 0 or 1 Escaped data sum of data type, seq number, payload size and payload. wrapping around itself Always <

Data types

Name Value
Data 0x00
Ack 0x01
DataMc1 0x02
DataIcd 0x09
DataEv 0x0a
DataMdr 0x0c
DataCommon 0x0d
DataMdr2 0x0e
Shot 0x10
ShotMc1 0x12
ShotIcd 0x19
ShotEv 0x1a
ShotMdr 0x1c
ShotCommon 0x1d
ShotMdr2 0x1e
LargerData 0x2d

Payloads for WF-1000XM4

DataMdr

This data type is used to set or read the state of the headphone.

The first 2 bytes are used to specify the kind of state you want to query or change.
Code - 2B Payload - NB

Noise cancelling

Codes :

  • 0x6815 : Write
  • 0x6915 : Read

Payload :

Continous mode - 1B NC enable - 1B NC mode - 1B NC Wind? - 1B NC voice passthrough - 1B NC level - 1B
Only 0 when continously changing the NC level otherwie 1 0 or 1 0 or 1 See Wind 0 or 1 0 to 20 (0x0a)
Wind
  • 0x02 : Disabled
  • 0x03 : Enabled without voice passthrough
  • 0x05 : Enabled with voice passthrough

Speak-To-Chat

Codes :

  • 0xf802 : Write

Payload :

Speak-To-Chat enable - 1B ? - 1B
0 or 1 Always 1

DSEE Extreme

Codes :

  • 0xe801 : Write

Payload :

DSEE Extreme enable - 1B
0 or 1

Equalizer

Codes :

  • 0x5800 : Write
  • 0x5900 : Read
Set Equalizer

Payload :

Command - 2B Profile - 1B Number of bands - 1B Bass - 1B 400 - 1B 1k - 1B 2.5k - 1B 6.3k - 1B 16k - 1B
5800 a1 0x06

Each band can go from -10db (0x00) to +10db (0x14), +0 being 0x04

Set Profile
Command - 2B Profile - 1B Number of bands - 1B
0x5800 0x00
Profile Code
Off 0x00
Custom 1 0xa1
Custom 2 0xa2
...

Headset will respond with Ack then send back the current state of the equalizer with command 5900

Automatic Power Off

Command - 2B Auto Off - 1B ?? - 1B
0x2805 0x11 => Off , 0x10 => On 0x00

Headset will respond with Ack then send back the current state of this option with command 0x2905

Pause when removed

Command - 2B Pause - 1B
f801 0x00 => On, 0x01 => Off

Headset will respond with Ack then send back the current state of this option with command 0xf901

Notification & Voice Guide

Command - 2B Notif - 1B
4801 0x00 => On, 0x01 => Off

Headset will respond with Ack then send back the current state of this option with command 0x4901