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Shearwater Bluetooth Import

Shearwater Petrel and Perdix computers use the "Petrel Native Format" for bluetooth communication. This format is not public, so this is based on code in libdivecomputer.

Bluetooth LE

Shearwater devices use a single serial port characteristic (UUID: 27b7570b-359e-45a3-91bb-cf7e70049bd2) for receiving (NOTIFY) and sending (WRITE) messages.

Download

We can send commands over the serial port characteristic to download raw chunks of memory:

  • 0x34: Start download with given memory address and size.
  • 0x35: Enabled or disable compression
  • 0x36: Fetch the next block of current download
  • 0x37: End download

There are two locations of interest:

  • 0xE0000000: Manifest pages
  • 0x80000000: Dive data

See ShearwaterConnection.kt for implementation details.