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Add metadata parsing documentation

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Tim Gromeyer
2025-04-15 10:41:02 +02:00
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AAP Definitions.md
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@@ -155,6 +155,37 @@ The packet format is:
```
Here, `01` at the 8th byte (offset 7) means CA is enabled.
## Metadata
This packet contains device information like name, model number, etc. The packet format is:
```plaintext
04 00 04 00 1d [strings...]
```
The strings are null-terminated UTF-8 strings in the following order:
1. Bluetooth advertising name (varies in length)
2. Model number
3. Manufacturer
4. Serial number
5. Firmware version
6. Firmware version 2 (the exact same as before??)
7. Software version (1.0.0 why would we need it?)
8. App identifier (com.apple.accessory.updater.app.71 what?)
9. Serial number 1
10. Serial number 2
11. Unknown numeric value
12. Encrypted data
13. Additional encrypted data
Example packet:
```plaintext
040004001d0002d5000400416972506f64732050726f004133303438004170706c6520496e632e0051584e524848595850360036312e313836383034303030323030303030302e323731330036312e313836383034303030323030303030302e3237313300312e302e3000636f6d2e6170706c652e6163636573736f72792e757064617465722e6170702e3731004859394c5432454632364a59004833504c5748444a32364b3000363335373533360089312a6567a5400f84a3ca234947efd40b90d78436ae5946748d70273e66066a2589300035333935303630363400```
The packet contains device identification and version information followed by some encrypted data whose format is not known.
# Writing to the AirPods
## Changing Noise Control