* [BT] Default BLE AES key empty, skip decryption without a key
Shipping a non-empty default key caused fresh installs to attempt
decryption of every encrypted PVVX/BTHome v2/Victron advertisement with
the placeholder string from User_config.h. Frames that didn't happen to
share that key were silently dropped at the CCM auth step, masking
otherwise-decodable devices (notably Victron MPPT) until users found and
entered a per-MAC key.
Initialise ble_aes[] to "" and treat an empty default as "no default
configured" in the decryption path - mirroring Theengs Gateway, which
has no default and skips frames whose MAC has no bindkey. Per-MAC keys
in ble_aes_keys still take precedence; the BLE_AES macro remains as the
WebUI placeholder hint.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* [BT] clang-format: move BLE_AES default comment above #define
clang-format-9 rejected the trailing-comment continuation on the empty
BLE_AES default line. Move the explanation to a leading // block above
the #ifndef so the directive line is comment-free.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* [BT] Use THEENGS_LOG_TRACE for missing-AES-key skip log
Previous commit referenced THEENGS_LOG_DEBUG, which OMG does not define
(only VERBOSE/TRACE/NOTICE/WARNING/ERROR exist), breaking every BLE
firmware build. Switch to THEENGS_LOG_TRACE — same level as the adjacent
"Custom AES key" / "Default AES key" trace lines.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
