v0.5.2: Critical Handshake Protocol Fix

🚨 Critical Hotfix

IMPORTANT: This release fixes a critical protocol bug that was the actual root cause of the CM160 historical sync issue.

Root Cause Identified

The device sends IDTWAITPCR (with 'R' at the end) but the library was only checking for IDTWAITPC (missing 'R'). This caused the handshake to fail completely, leading to the infinite loop described in the bug report.

Technical Fix

• Protocol Correction: Fixed ID_WAIT_HISTORY constant from "IDTWAITPC" to "IDTWAITPCR"
• Buffer Decoding: Extended message decoding from bytes 1-9 to 1-10 to capture the full 10-character message
• Reference Compliance: Now matches the reference implementation exactly

Message Analysis

Bug report showed device sending: a949445457414954504352

• Decoded: IDTWAITPCR (10 characters)
• Previous code only checked: IDTWAITPC (9 characters)
• Result: Handshake never completed, causing infinite loop

Impact

This was the actual root cause of the CM160 getting stuck in historical sync mode. The timeout fix in v0.5.1 helped as a workaround, but this fix addresses the fundamental protocol issue.

Recommendation: Upgrade immediately from v0.5.1 for proper protocol compliance.