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 +1,78 @@
+"""
+Search the entire 286-byte and 989-byte packets for the ECG HR value (88).
+The ECG HR must be somewhere in the packet data.
+"""
+import struct
+
+with open("/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin", "rb") as f:
+    stream = f.read()
+
+# Find all 286-byte packets with SpO2=98 at offset 264
+# (indicating a time when the monitor was showing ECG=88, SpO2=98)
+packets = []
+i = 0
+while i < len(stream) - 8:
+    if (stream[i + 2] == 0x04 or stream[i + 2] == 0x01) and stream[i + 3] == 0x46:
+        pkt_len = struct.unpack_from('<H', stream, i)[0]
+        if 30 < pkt_len < 1050 and i + pkt_len <= len(stream):
+            packets.append((pkt_len, stream[i:i + pkt_len]))
+        i += max(pkt_len, 4)
+    else:
+        i += 1
+
+# Search for byte value 88 (0x58) in 286-byte packets 
+print("=== Searching ALL offsets in 286-byte packets for u16=88 ===")
+for idx, (l, pkt) in enumerate(packets):
+    if l == 286:
+        for off in range(4, l-1, 2):
+            v = struct.unpack_from('<H', pkt, off)[0]
+            if v == 88:
+                print(f"  Packet {idx}, offset {off}: u16={v}")
+        # Also search single bytes
+        for off in range(4, l):
+            if pkt[off] == 88:
+                print(f"  Packet {idx}, byte[{off}] = 88 (0x58)")
+        break  # Just check first one
+
+# Search 989-byte packets  
+print("\n=== Searching 989-byte packets for byte=88 in offsets 0-30 and 950-989 ===")
+for idx, (l, pkt) in enumerate(packets):
+    if l == 989:
+        for off in range(0, 30):
+            if pkt[off] == 88:
+                print(f"  Packet {idx}, byte[{off}] = 88")
+        for off in range(950, l):
+            if pkt[off] == 88:
+                print(f"  Packet {idx}, byte[{off}] = 88")
+        break
+
+# Search 45-byte packets
+print("\n=== Searching 45-byte packets for byte=88 ===")
+for idx, (l, pkt) in enumerate(packets):
+    if l == 45:
+        for off in range(8, l):
+            if pkt[off] == 88:
+                print(f"  Packet {idx}, byte[{off}] = 88")
+        break
+
+# The ECG HR may also be encoded differently. Let's check what's at byte 
+# positions right before the alarm limits in the 45-byte packet
+print("\n=== 45-byte packet: All non-zero bytes with their positions ===")
+for idx, (l, pkt) in enumerate(packets):
+    if l == 45:
+        for off in range(8, l):
+            if pkt[off] != 0:
+                print(f"  byte[{off}] = {pkt[off]} (0x{pkt[off]:02x})")
+        break
+
+# Check the 45-byte packet at index 147 specifically (when NIBP was 110/67/82)
+print("\n=== 45-byte packet at the time of NIBP 110/67/82 ===")
+count = 0
+for idx, (l, pkt) in enumerate(packets):
+    if l == 45:
+        count += 1
+        if count > 36:  # Skip to around packet index 147
+            for off in range(8, l):
+                if pkt[off] != 0:
+                    print(f"  byte[{off}] = {pkt[off]} (0x{pkt[off]:02x})")
+            break