logging error with more than 255 chinks

chunked_gelf_error.py

import logging

from graypy import GELFHandler

chunk_size = 1
handler = GELFHandler('127.0.0.1', compress=False, chunk_size=chunk_size)

logger = logging.getLogger()
logger.addHandler(handler)

# in chunked GELF sequence count is 1 byte, so there can't be more than 255 chunks
message = ' ' * chunk_size * 256
logger.info(message)

# Traceback (most recent call last):
#   File "/usr/lib/python2.7/logging/handlers.py", line 581, in emit
#     self.send(s)
#   File "/home/andrey/platform/backend/env/local/lib/python2.7/site-packages/graypy/handler.py", line 60, in send
#     for chunk in ChunkedGELF(s, self.chunk_size):
#   File "/home/andrey/platform/backend/env/local/lib/python2.7/site-packages/graypy/handler.py", line 76, in __init__
#     self.pieces = struct.pack('B', int(math.ceil(len(message) * 1.0/size)))
# error: ubyte format requires 0 <= number <= 255