refactor: implement packet parsing heuristics and introduce device-level state caching to throttle database writes and vitals updates

2026-07-11 14:24:14 +05:30
parent a4972b3251
commit 84b8acc904
32 changed files with 3499 additions and 180 deletions
@@ -0,0 +1,56 @@
+import struct
+
+def read_u16_le(data: bytes, offset: int) -> int:
+    if offset + 2 > len(data):
+        return None
+    return struct.unpack_from('<H', data, offset)[0]
+
+with open("/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin", "rb") as f:
+    stream = f.read()
+
+# Extract 45-byte packets (subtype 22)
+packets = []
+consumed = 0
+while consumed < len(stream) - 4:
+    b0 = stream[consumed]
+    b1 = stream[consumed + 1]
+    b2 = stream[consumed + 2]
+    b3 = stream[consumed + 3]
+    
+    if (b2 == 0x04 or b2 == 0x01) and b3 == 0x46:
+        pkt_len = b0 | (b1 << 8)
+        if pkt_len == 45 and consumed + pkt_len <= len(stream):
+            packets.append(stream[consumed:consumed + pkt_len])
+            consumed += pkt_len
+        else:
+            if pkt_len < 5 or pkt_len > 8192:
+                consumed += 1
+            else:
+                consumed += pkt_len
+    else:
+        consumed += 1
+
+print(f"Found {len(packets)} 45-byte packets:")
+seen_timestamps = set()
+for p in packets:
+    # Decode timestamp
+    year = read_u16_le(p, 8)
+    month = p[10]
+    day = p[11]
+    hour = p[12]
+    minute = p[13]
+    second = p[14]
+    ts_str = f"{year:04d}-{month:02d}-{day:02d} {hour:02d}:{minute:02d}:{second:02d}"
+    
+    if ts_str in seen_timestamps:
+        continue
+    seen_timestamps.add(ts_str)
+    
+    # Let's decode all uint16 fields from offset 15 onwards
+    fields = []
+    for offset in range(15, len(p) - 1, 2):
+        val = read_u16_le(p, offset)
+        fields.append(f"off{offset}:{val}")
+    
+    print(f"Timestamp: {ts_str} | Payload: {p[15:].hex()}")
+    print("  Decoded uint16s: " + ", ".join(fields))