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 +1,40 @@
+import struct
+
+def read_f32_le(data: bytes, offset: int) -> float:
+    if offset + 4 > len(data):
+        return None
+    return struct.unpack_from('<f', data, offset)[0]
+
+with open("/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin", "rb") as f:
+    stream = f.read()
+
+# Extract 56-byte packets (subtype 23)
+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 == 56 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)} 56-byte packets:")
+# Print the float32 values of the first packet at every possible offset
+if packets:
+    p = packets[0]
+    print(f"Sample 56-byte packet: {p.hex()}")
+    for offset in range(8, len(p) - 3, 4):
+        val = read_f32_le(p, offset)
+        print(f"  Offset {offset:02d}: {val}")