9756538f16
Organizes 11 projects for Cerbo GX/Venus OS into a single repository: - axiom-nmea: Raymarine LightHouse protocol decoder - dbus-generator-ramp: Generator current ramp controller - dbus-lightning: Blitzortung lightning monitor - dbus-meteoblue-forecast: Meteoblue weather forecast - dbus-no-foreign-land: noforeignland.com tracking - dbus-tides: Tide prediction from depth + harmonics - dbus-vrm-history: VRM cloud history proxy - dbus-windy-station: Windy.com weather upload - mfd-custom-app: MFD app deployment package - venus-html5-app: Custom Victron HTML5 app fork - watermaker: Watermaker PLC control UI Adds root README, .gitignore, project template, and per-project .gitignore files. Sensitive config files excluded via .gitignore with .example templates provided. Made-with: Cursor
84 lines
2.4 KiB
Python
84 lines
2.4 KiB
Python
#!/usr/bin/env python3
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"""Compare old offsets vs new 0x006b offset for wind direction."""
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import struct
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from collections import defaultdict
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def decode_float(data, offset):
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if offset + 4 > len(data):
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return None
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try:
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val = struct.unpack('<f', data[offset:offset+4])[0]
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if val != val: # NaN check
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return None
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return val
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except:
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return None
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def read_pcap(filename):
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packets = []
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with open(filename, 'rb') as f:
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header = f.read(24)
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magic = struct.unpack('<I', header[0:4])[0]
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swapped = magic == 0xd4c3b2a1
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endian = '>' if swapped else '<'
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while True:
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pkt_header = f.read(16)
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if len(pkt_header) < 16:
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break
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ts_sec, ts_usec, incl_len, orig_len = struct.unpack(f'{endian}IIII', pkt_header)
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pkt_data = f.read(incl_len)
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if len(pkt_data) < incl_len:
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break
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if len(pkt_data) > 42 and pkt_data[12:14] == b'\x08\x00':
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ip_header_len = (pkt_data[14] & 0x0F) * 4
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payload_start = 14 + ip_header_len + 8
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if payload_start < len(pkt_data):
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packets.append(pkt_data[payload_start:])
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return packets
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# Current offsets from decoder
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OLD_OFFSETS = {
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344: 0x00a0,
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446: 0x00a7,
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788: 0x00c5,
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888: 0x00c5,
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931: 0x00c5,
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1031: 0x00c5,
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1472: 0x00fc,
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}
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NEW_OFFSET = 0x006b
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for pcap_file in ["raymarine_sample.pcap", "raymarine_sample_twd_69-73.pcap"]:
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print(f"\n{'='*70}")
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print(f"FILE: {pcap_file}")
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print("="*70)
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packets = read_pcap(pcap_file)
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print(f"Loaded {len(packets)} packets\n")
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print(f"{'Pkt Size':<10} {'Old Offset':<12} {'Old Value':<15} {'New (0x006b)':<15}")
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print("-" * 55)
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for pkt_len in sorted(OLD_OFFSETS.keys()):
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old_offset = OLD_OFFSETS[pkt_len]
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# Find packets of this size
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matching = [p for p in packets if len(p) == pkt_len]
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if not matching:
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continue
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# Sample first packet of this size
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pkt = matching[0]
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old_val = decode_float(pkt, old_offset)
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new_val = decode_float(pkt, NEW_OFFSET)
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old_deg = f"{old_val * 57.2958:.1f}°" if old_val and 0 <= old_val <= 6.5 else "invalid"
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new_deg = f"{new_val * 57.2958:.1f}°" if new_val and 0 <= new_val <= 6.5 else "invalid"
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print(f"{pkt_len:<10} 0x{old_offset:04x} {old_deg:<15} {new_deg:<15}")
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