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e48537c525
https://github.com/merbanan/rtl_433/issues/2014: the protocol was fully reverse-engineered in the issue (OOK PPM timing, checksum, 2's-complement temperature confirmed via a freezer test, battery-low bit confirmed via an old-vs-fresh-battery comparison, even a working Arduino sketch) but never ported into rtl_433 before the reporter lost interest. Verified against all of the issue's distinct examples via -y, including a low-battery reading and a second physical unit from a neighbor's device. One correction: the original post's "-22.6 C" label for one capture doesn't match the checksum-verified 2's-complement decode (which gives +22.6 C) -- that label predates the freezer test that established the actual encoding, so it looks like an early mislabeling rather than a real discrepancy. The wire checksum is only 4 bits, too weak to reject noise reliably on its own -- enabling this against the full rtl_433_tests corpus produced two dozen false positives on unrelated weather-sensor protocols with similar OOK/PPM timing. Added a flags-nibble check and a plausible temperature range, both satisfied by every real capture available, which eliminates all of them.