diff --git a/utils/__init__.py b/utils/__init__.py
new file mode 100644
index 0000000..06d7405
Binary files /dev/null and b/utils/__init__.py differ
diff --git a/utils/packet.py b/utils/packet.py
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--- /dev/null
+++ b/utils/packet.py
@@ -0,0 +1,22 @@
+import struct
+
+HEAD_STANDARD = 0x05
+HEAD_FOTA = 0x15
+CMD_GET_BUILD = 0x1E08
+CMD_READ_FLASH = 0x0403
+CMD_GET_BD_ADDR = 0x0C05
+
+def build_race_packet(cmd: int, payload: bytes = b'', head: int = HEAD_STANDARD) -> bytes:
+    pkt_type = 0x00
+    length = 2 + len(payload)
+    header = struct.pack('<BBH', head, pkt_type, length)
+    cmd_bytes = struct.pack('<H', cmd)
+    return header + cmd_bytes + payload
+
+def parse_race_response(data: bytes) -> dict:
+    if len(data) < 6:
+        return {"error": "Packet too short"}
+    head, pkt_type, length = struct.unpack_from('<BBH', data, 0)
+    cmd = struct.unpack_from('<H', data, 4)[0]
+    payload = data[6:6+length-2]
+    return {"head": hex(head), "type": pkt_type, "length": length, "cmd": hex(cmd), "payload": payload}