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 == 989 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 100 bytes of 989-byte packet:")
    for off in range(889, 989, 2):
        val = pkt[off] | (pkt[off+1] << 8)
        print(f"  Offset {off}: hex={pkt[off]:02x} {pkt[off+1]:02x} -> u16 LE = {val}")