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 +1,63 @@
+import struct
+
+def search_value_in_packet(p: bytes, val: int, label: str):
+    # Search as uint8
+    for offset in range(len(p)):
+        if p[offset] == val:
+            print(f"    {label} found as uint8 at offset {offset}")
+            
+    # Search as uint16 LE
+    for offset in range(len(p) - 1):
+        v = struct.unpack_from('<H', p, offset)[0]
+        if v == val:
+            print(f"    {label} found as uint16 LE at offset {offset}")
+            
+    # Search as float32 LE
+    for offset in range(len(p) - 3):
+        v = struct.unpack_from('<f', p, offset)[0]
+        if abs(v - float(val)) < 0.01:
+            print(f"    {label} found as float32 LE at offset {offset}")
+
+with open("/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin", "rb") as f:
+    stream = f.read()
+
+# Extract packets
+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 < 5 or pkt_len > 8192:
+            consumed += 1
+            continue
+        
+        if consumed + pkt_len <= len(stream):
+            packets.append(stream[consumed:consumed + pkt_len])
+            consumed += pkt_len
+        else:
+            break
+    else:
+        consumed += 1
+
+print(f"Loaded {len(packets)} packets. Scanning for HR=88, Systolic=108, MAP=75...")
+
+for idx, p in enumerate(packets):
+    l = len(p)
+    subtype = p[6] if l > 6 else -1
+    
+    # Let's decode timestamp if it is a 45-byte packet
+    ts_str = ""
+    if l == 45:
+        year = struct.unpack_from('<H', p, 8)[0]
+        month, day, hour, minute, second = p[10], p[11], p[12], p[13], p[14]
+        ts_str = f" @ {year}-{month:02d}-{day:02d} {hour:02d}:{minute:02d}:{second:02d}"
+        
+    print(f"\nPacket #{idx} (Len={l}, Subtype={subtype}){ts_str}:")
+    search_value_in_packet(p, 88, "HR (88)")
+    search_value_in_packet(p, 108, "Systolic (108)")
+    search_value_in_packet(p, 75, "MAP (75)")