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docs: add some docs

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I made this a while back, it is very incomplete, just adding in case anyone's looking for the opcodes
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Kavish Devar
2026-04-28 16:19:17 +05:30
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# AACP opcodes
AACP (Apple Accessory Communication Protocol) uses various opcodes to define different types of actions and commands. Each opcode is a 16-bit integer that specifies the kind of operation being performed. The opcode is sent in little-endian format as part of the AACP packet structure.
| Opcode (Hex) | Destination | Description |
| ------------ | ----------- | ------------------------------------------------------------------ |
| 0x0001 | Accessory | Unknown |
| 0x0004 | Host | [Battery report](/docs/battery_report.md) |
| 0x0006 | Host | [Ear detection](/docs/ear-detection_report.md) |
| 0x0009 | Both | [Control commands](/docs/control_commands.md) |
| 0x000D | Accessory | [Audio source req](/docs/audio-source.md) |
| 0x000E | Host | [Audio source resp](/docs/audio-source.md) |
| 0x000F | Accessory | [Notification register](/docs/notification-register.md) |
| 0x0010 | Accessory | [Smart routing relay](/docs/smart-routing-relay.md#send) |
| 0x0011 | Host | [Smart routing response](/docs/smart-routing-relay.md#receive) |
| 0x0014 | Accessory | Send connected device MAC |
| 0x0017 | Both | Multiple things - undocumented |
| 0x0019 | Host | [Stem press](/docs/stem-press.md) |
| 0x001B | Accessory | [Timestamp](/docs/timestamp.md) |
| 0x001D | Host | [Device Information](/docs/device-info.md) |
| 0x001E | Accessory | [Rename device](/docs/rename.md) |
| 0x0022 | Accessory | Unknown |
| 0x0029 | Accessory | [Host capabilities](/docs/host-capabilities.md#another-opcode) (?) |
| 0x002B | Host | Paired devices (?) |
| 0x002D | Accessory | [List of connected dev. req](/docs/connected-devices.md#send) |
| 0x002E | Host | [List of connected devices](/docs/connected-devices.md#receive) |
| 0x0030 | Accessory | [BLE keys req](/docs/ble-keys.md) |
| 0x0031 | Host | [BLE keys response](/docs/ble-keys.md) |
| 0x004B | Host | [Conversation awareness](/docs/conversational-awareness.md) |
| 0x004D | Accessory | [Host capabilities](/docs/host-capabilities.md) |
| 0x004F | Both | Information req/res (doesn't work, even with apple's DID) |
| 0x0053 | Both | [EQ data](/docs/eq.md) |