# Control Commands

AACP uses opcode `9` for control commands. opcodes are 16 bit integers that specify the kind of action being done. The length of a control command is fixed to 7 bytes + 4 bytes header (`04 00 04 00`)

An AACP packet is formated as:

`04 00 04 00 [opcode, little endian] [data]`

So, our control commands becomes

```
04 00 04 00 09 00 [identifier] [data1] [data2] [data3] [data4]
```

Bytes that are not used are set to `0x00`. From what I've observed, the `data3` and `data4` are never used, and hence always zero. And, the `data2` is usually used when the configuration can be different for the two buds: like, to change the long press mode. Or, if there can be two "state" variables for the same feature: like the Hearing Aid feature.

## Identifiers and details 

| Command identifier | Description |
|--------------|---------------------|
| 0x01 | Mic Mode |
| 0x05 | Button Send Mode |
| 0x06 | Owns connection |
| 0x0A | Ear Detection |
| 0x12 | VoiceTrigger for Siri |
| 0x14 | SingleClickMode |
| 0x15 | DoubleClickMode |
| 0x16 | ClickHoldMode |
| 0x17 | DoubleClickInterval |
| 0x18 | ClickHoldInterval |
| 0x1A | ListeningModeConfigs |
| 0x1B | OneBudANCMode |
| 0x1C | CrownRotationDirection |
| 0x0D | ListeningMode |
| 0x1E | AutoAnswerMode |
| 0x1F | Chime Volume |
| 0x20 | Connect Automatically |
| 0x23 | VolumeSwipeInterval |
| 0x24 | Call Management Config |
| 0x25 | VolumeSwipeMode |
| 0x26 | Adaptive Volume Config |
| 0x27 | Software Mute config |
| 0x28 | Conversation Detect config |
| 0x29 | SSL |
| 0x2C | Hearing Aid Enrolled and Hearing Aid Enabled |
| 0x2E | AutoANC Strength |
| 0x2F | HPS Gain Swipe |
| 0x30 | HRM enable/disable state |
| 0x31 | In Case Tone config |
| 0x32 | Siri Multitone config |
| 0x33 | Hearing Assist config |
| 0x34 | Allow Off Option for Listening Mode config |
| 0x35 | Sleep Detection config |
| 0x36 | Allow Auto Connect |
| 0x37 | PPE Toggle config |
| 0x38 | Personal Protective Equipment Cap Level config |
| 0x39 | Raw Gestures config |
| 0x3A | Temporary Pairing Config |
| 0x3B | Dynamic End of Charge config |
| 0x3C | System Siri message config |
| 0x3D | Hearing Aid Generic config |
| 0x3E | Uplink EQ Bud config |
| 0x3F | Uplink EQ Source config |
| 0x40 | In Case Tone Volume |
| 0x41 | Disable Button Input config |

## Command Details

### 0x01 - Mic Mode
Format: Single value (1 byte)
Values: `0x00` = Automatic, `0x01` = Right, `0x02` = Left.

### 0x05 - Button Send Mode
Format: Single value (1 byte)
Additional notes: Logged as "Set Button Send Mode: %d". May involve context updates for button handling.

### 0x06 - Owns connection
Format: Single value (1 byte)
Values: `0x01` = own, `0x00` = doesn't own.

### 0x0A - Ear Detection
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled.

### 0x12 - VoiceTrigger for Siri
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled.

### 0x14 - SingleClickMode
Format: Single value (1 byte)

### 0x15 - DoubleClickMode
Format: Single value (1 byte)

### 0x16 - ClickHoldMode
Format: Two values (2 bytes; First byte = right bud, Second byte = left bud).  
Values: `0x01` = Noise control, `0x05` = Siri.  

### 0x17 - DoubleClickInterval
Format: Single value (1 byte)
Values: 0x00 = Default, `0x01` = Slower, `0x02` = Slowest.  

### 0x18 - ClickHoldInterval
Format: Single value (1 byte)
Values: 0x00 = Default, `0x01` = Slower, `0x02` = Slowest.  

### 0x1A - ListeningModeConfigs
Format: Single value (1 byte)
Values: Bitmask, Off mode = `0x01`, ANC=`0x02`, Transparency = 0x04, Adaptive = `0x08`.  

### 0x1B - OneBudANCMode
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x1C - CrownRotationDirection
Format: Single value (1 byte)
Values: `0x01` = reversed, `0x02` = default.  

### 0x0D - ListeningMode
Format: Single value (1 byte)
Values: 1 = Off, 2 = noise cancellation, 3 = transparency, 4 = adaptive.  

### 0x1E - AutoAnswerMode
Format: Single value (1 byte)

### 0x1F - Chime Volume
Format: Single value (1 byte)
Values: 0 to 100.  

### 0x20 - Connect Automatically
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled.

### 0x23 - VolumeSwipeInterval
Format: Single value (1 byte)
Values: 0x00 = Default, `0x01` = Longer, `0x02` = Longest.  

### 0x24 - Call Management Config
Format: Single value (1 byte)

### 0x25 - VolumeSwipeMode
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x26 - Adaptive Volume Config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x27 - Software Mute config
Format: Single value (1 byte)

### 0x28 - Conversation Detect config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x29 - SSL
Format: Single value (1 byte)

### 0x2C - Hearing Aid Enrolled and Hearing Aid Enabled
Format: Two values (2 bytes; First byte - enrolled, Second byte = enabled)
Values: `0x01` = enabled, `0x02` = disabled

### 0x2E - AutoANC Strength
Format: Single value (1 byte)
Values: 0 to 100.  

### 0x2F - HPS Gain Swipe (swipe to adjust amplification)
Format: Single value (1 byte)

### 0x30 - HRM enable/disable state
Format: Single value (1 byte)

### 0x31 - In Case Tone config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x32 - Siri Multitone config
Format: Single value (1 byte)

### 0x33 - Hearing Assist config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x34 - Allow Off Option for Listening Mode config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x35 - Sleep Detection config
Format: Single value (1 byte)
Values: `0x01` = enabled, `0x02` = disabled

### 0x36 - Allow Auto Connect
Format: Single value (1 byte)
Values: `0x01` = allow, `0x02` = disallow

### 0x37 - PPE Toggle config
Format: Single value (1 byte)

### 0x38 - Personal Protective Equipment Cap Level config
Format: Single value (1 byte)

### 0x39 - Raw Gestures config
Format: Single value (1 byte)
Values: Bitmask, single press = `0x01`, double press = `0x02`, triple press = `0x04`, long press = `0x08`.  

### 0x3A - Temporary Pairing Config
Format: Single value (1 byte)
Values: `0x01` = Temporary, `0x02` = Permanent

### 0x3B - Dynamic End of Charge config
Format: Single value (1 byte)

### 0x3C - System Siri message config
Format: Single value (1 byte)

### 0x3D - Hearing Aid Generic config
Format: Single value (1 byte)

### 0x3E - Uplink EQ Bud config
Format: Single value (1 byte)

### 0x3F - Uplink EQ Source config
Format: Single value (1 byte)

### 0x40 - In Case Tone Volume
Format: Single value (1 byte)
Values: 0 to 100.  

### 0x41 - Disable Button Input config
Format: Single value (1 byte)

> [!NOTE]
> - These identifiers have been extracted from the iOS 19.1 Beta (23B5044l)'s bluetooth stack. 
> - I have already added the ranges of values a command takes that I know of. Feel free to experiment by sending the packets for which the range/values are not given here.