Buffer size too small

[AHellLycan]

Re: Buffer size SOLVED
Hello, I'm using struct to pack and unpack a message as the following

HEADER_FORMAT = "!8s8sHHB3s"
header = struct.pack(HEADER_FORMAT, source_addr, dest_addr, seqnum, acknum, flags, check)
sp, dp, seqnum, acknum, flags, check = struct.unpack(HEADER_FORMAT, header)

However after the lopy receives the first message it gives me the ValueError:Buffer too small.
I'm making the communication between a lopy and raspberry.
I don't know what the problem is, could you help me please?
Thanks in advance