Wire protocol for Alientek's BLE test/measurement devices (DM40 multimeter, ND1 dosimeter, EL15 electronic load, HP15/HP20 hot plates, C2 USB tester), reverse-engineered from the official Android apps. Sufficient to implement a from-scratch client for all six devices; per-device sections note remaining gaps explicitly.
Sources: v1.8 (ATK-XTOOL 1.82.apk, .NET MAUI, IL-decompiled — exact) and
v2.0.12 (atk-xtool 2.0.12.apk, Flutter/Dart AOT, decompiled via blutter +