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Fix 24 bit signed integer parsing in sml parser (#5250)
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@ -88,6 +88,11 @@ uint64_t bytes_to_uint(const bytes &buffer) {
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for (auto const value : buffer) {
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val = (val << 8) + value;
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}
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// Some smart meters send 24 bit signed integers. Sign extend to 64 bit if the
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// 24 bit value is negative.
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if (buffer.size() == 3 && buffer[0] & 0x80) {
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val |= 0xFFFFFFFFFF000000;
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}
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return val;
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}
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