When Kotlin provides the identity via callback (from the identity characteristic read),
the address_to_identity mapping gets set BEFORE the 16-byte handshake data arrives
through _data_received_callback. Previously, _handle_identity_handshake would see the
identity already exists and return False, causing the 16-byte handshake data to be
passed to the reassembler where it fails with "Invalid fragment type 0xXX".
The fix checks if received 16-byte data matches the known identity and consumes it
silently if so. This prevents the handshake data from being misinterpreted as a
fragment.
Symptoms fixed:
- BLEReassembler: Invalid fragment type 0xc9 (first byte of peer identity)
- Messages not flowing even though connections appear established
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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