PRE-M8-T01: add WarmteLink P1 telegram parser

tests/test_p1_probe.py

@@ -0,0 +1,76 @@
+from decimal import Decimal
+from pathlib import Path
+
+from scripts.p1_probe import IntegrityStatus, TelegramFramer, parse_telegram
+
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+def _fixture(name: str) -> bytes:
+    return (FIXTURES / name).read_bytes()
+
+
+def test_standard_dsmr_fixture_has_a_valid_frame_and_crc():
+    frame = _fixture("dsmr_p1_valid.txt")
+    framer = TelegramFramer()
+
+    assert framer.feed(frame[:23]) == []
+    assert framer.feed(frame[23:]) == [frame]
+
+    telegram = parse_telegram(frame)
+    assert telegram.integrity is IntegrityStatus.VALID
+    assert telegram.header == b"/ISk5\\2MT382-1000"
+    assert telegram.timestamp == "240822120000S"
+
+
+def test_warmtelink_fixture_is_unverifiable_but_parses_channels_by_obis_code():
+    telegram = parse_telegram(_fixture("warmtelink_p1_7n1.txt"))
+
+    assert telegram.integrity is IntegrityStatus.UNVERIFIABLE
+    assert "missing standard" in telegram.integrity_reason
+    assert [channel.number for channel in telegram.channels] == [1, 2]
+    values = {
+        channel.number: [(field.value, field.unit) for field in channel.readings]
+        for channel in telegram.channels
+    }
+    assert values[1] == [(Decimal("5.900"), "m3")]
+    assert values[2] == [(Decimal("0.017"), "GJ")]
+
+
+def test_arbitrary_chunk_boundaries_and_field_order_do_not_change_parsing():
+    frame = _fixture("warmtelink_p1_7n1.txt")
+    framer = TelegramFramer()
+    frames = []
+    for byte in frame:
+        frames.extend(framer.feed(bytes([byte])))
+
+    assert frames == [frame]
+    assert parse_telegram(frames[0]).channels == parse_telegram(frame).channels
+
+
+def test_unknown_fields_are_preserved_verbatim():
+    frame = b")HEADER\n9-9:9.9.9(opaque)(still-opaque)\n!nope\n"
+
+    telegram = parse_telegram(frame)
+
+    assert len(telegram.fields) == 1
+    assert telegram.fields[0].code == "9-9:9.9.9"
+    assert telegram.fields[0].raw_values == ("opaque", "still-opaque")
+    assert telegram.fields[0].value is None
+
+
+def test_missing_header_and_non_hex_footer_are_unverifiable():
+    telegram = parse_telegram(b")HEADER\n0-0:1.0.0(240822120000S)\n!zzzz\n")
+
+    assert telegram.integrity is IntegrityStatus.UNVERIFIABLE
+    assert telegram.footer == b"zzzz"
+
+
+def test_crc_mismatch_is_invalid_when_standard_framing_is_present():
+    frame = _fixture("dsmr_p1_valid.txt")
+    invalid = frame[:-5] + b"0000\n"
+
+    telegram = parse_telegram(invalid)
+
+    assert telegram.integrity is IntegrityStatus.INVALID