Compact IMU BLE samples for firmware 2.3.0 - #3
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This was referenced Oct 4, 2026
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Firmware 2.3.x sends IMU acceleration and gyroscope readings as six signed int16 counts, followed by the three unchanged calibrated magnetometer floats. This reduces BLE samples from 36 to 24 bytes. The library restores the exact existing float32 values and units before applying the advertised parsing scheme.
Firmware version selects the format per connection. SD/.oe records stay at 36 bytes, and older firmware keeps the existing BLE layout. Includes generated C/Dart codecs, scale documentation, and signed-boundary/golden-byte tests.
Validation: all 18 protocol tests pass. Stacked on #1.