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fix: Decode GPS coordinates as int32/1e6, not float

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MeshCore encodes lat/lon as little-endian signed int32 divided by 1e6,
not as IEEE 754 floats. This caused all map pins to show at (0,0).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
MarekWo
2026-02-22 13:45:43 +01:00
parent 587bc8cb9f
commit 6d50391ea8
1 changed files with 3 additions and 2 deletions
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5
app/contacts_cache.py
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@@ -162,7 +162,7 @@ def parse_advert_payload(pkt_payload_hex: str):
[32:36] Timestamp (4 bytes)
[36:100] Signature (64 bytes)
[100] App Flags (1 byte) - bit 4: Location, bit 7: Name
[101+] If Location (bit 4): Lat (4 bytes) + Lon (4 bytes)
[101+] If Location (bit 4): Lat (4 bytes, LE int32/1e6) + Lon (4 bytes, LE int32/1e6)
If Name (bit 7): Node name (UTF-8, variable length)
Returns:
@@ -184,7 +184,8 @@ def parse_advert_payload(pkt_payload_hex: str):
if has_location:
if len(raw) >= 109:
lat, lon = struct.unpack('<ff', raw[101:109])
lat_i, lon_i = struct.unpack('<ii', raw[101:109])
lat, lon = lat_i / 1e6, lon_i / 1e6
# Validate: discard NaN, Infinity, and out-of-range values
if (math.isnan(lat) or math.isnan(lon) or
math.isinf(lat) or math.isinf(lon) or