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 +1,41 @@
+import struct
+
+filepath = "/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin"
+
+try:
+    with open(filepath, "rb") as f:
+        stream = f.read()
+except Exception as e:
+    print(f"Error: {e}")
+    import sys
+    sys.exit(1)
+
+# Find latest 288-byte and 989-byte packets
+pkt_288 = None
+pkt_989 = None
+i = 0
+while i < len(stream) - 4:
+    b0, b1, b2, b3 = stream[i], stream[i+1], stream[i+2], stream[i+3]
+    if b3 == 0x46:
+        pkt_len = b0 | (b1 << 8)
+        if pkt_len == 288 and i + pkt_len <= len(stream):
+            pkt_288 = stream[i:i + pkt_len]
+        elif pkt_len == 989 and i + pkt_len <= len(stream):
+            pkt_989 = stream[i:i + pkt_len]
+        i += max(pkt_len, 4)
+    else:
+        i += 1
+
+if pkt_288:
+    print("=== Scanning 288-byte packet (tail, offsets 250-287) for values 75-90 ===")
+    for off in range(250, len(pkt_288) - 1, 2):
+        val = struct.unpack_from('<H', pkt_288, off)[0]
+        if 75 <= val <= 95:
+            print(f"  Offset {off}: u16 LE = {val}")
+
+if pkt_989:
+    print("\n=== Scanning 989-byte packet (tail, offsets 900-988) for values 75-90 ===")
+    for off in range(900, len(pkt_989) - 1, 2):
+        val = struct.unpack_from('<H', pkt_989, off)[0]
+        if 75 <= val <= 95:
+            print(f"  Offset {off}: u16 LE = {val}")