13b95345c7
Spec with pseudocode and test vectors, APK disassembly, analysis tools, shelved reference Python and the macOS BLE probe. Findings are not yet validated against a real tag. The vendor XAPK and nested lib clone are excluded. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EinWd3UT2Xw7UakFtTp6hn
59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
"""Run: PYTHONPATH=src python test_bm200.py
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Frames here are built from the APK's parser, not captured from a tag.
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"""
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from datetime import datetime, timezone
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from bm2.bm200 import BM200_KEY, BM200Decoder, HistoryBlock, LiveReading, Version, _history_base, history_command
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from bm2.encryption import encrypt
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def enc(hex_str: str) -> bytes:
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return encrypt(bytes.fromhex(hex_str), BM200_KEY)
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def test() -> None:
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d = BM200Decoder()
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now = 1_700_000_000.0
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assert d.feed(enc("d15501010700"))[0] == Version(1.7)
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assert history_command(0xCA80).hex() == "d1550500000000ca80"
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# temp sign=1 temp=5 status=2 soc=0x55 volt=0x0508 acc=3 dec=4
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live = d.feed(enc("d155070105025505080003000400"), now)[0]
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assert isinstance(live, LiveReading)
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assert (live.temperature, live.status, live.soc, live.voltage) == (-5, 2, 0x55, 12.88)
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assert (live.rapid_acceleration, live.rapid_deceleration) == (3, 4)
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assert d.feed(enc("d15507ff")) == []
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assert d.feed(enc("d155050003"), now) == []
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# newest first: leading zeros, stop record + 4 trailer bytes, plain record
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assert d.feed(enc("00000000" + "50055194" + "00030004" + "4f050140"), now) == []
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# a live frame in the middle of a transfer stays out of the history
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assert isinstance(d.feed(enc("d155070005005505080000000000"), now)[0], LiveReading)
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# negative-temperature start record, then the end marker
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block = d.feed(enc("4e0000aa" + "fffefe00"), now)[0]
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assert isinstance(block, HistoryBlock)
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r = block.records
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assert [x.voltage for x in r] == [12.48, 12.64, 12.80] # oldest first
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assert [x.mark for x in r] == ["start", None, "stop"]
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assert (r[2].soc, r[2].temperature) == (0x55, 0x19)
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assert (r[0].soc, r[0].temperature) == (0, -0x0a)
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base = _history_base(now)
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assert datetime.fromtimestamp(base).minute % 2 == 1
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assert r[2].time == datetime.fromtimestamp(base, timezone.utc)
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assert (r[2].time - r[0].time).total_seconds() == 240
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# back to normal once the block ended
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assert d.feed(enc("d155050000"), now)[0] == HistoryBlock([])
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try:
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d.feed(b"\x00" * 15)
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raise AssertionError("short frame accepted")
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except ValueError:
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pass
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test()
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print("ok")
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