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 +1,21 @@
+with open("/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin", "rb") as f:
+    stream = f.read()
+
+packets = []
+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):
+            packets.append(stream[i:i + pkt_len])
+        i += max(pkt_len, 4)
+    else:
+        i += 1
+
+if packets:
+    pkt = packets[-1]
+    print("Last 40 bytes of 288-byte packet:")
+    for off in range(248, 288, 2):
+        val = pkt[off] | (pkt[off+1] << 8)
+        print(f"  Offset {off}: hex={pkt[off]:02x} {pkt[off+1]:02x} -> u16 LE = {val}")