Hi Kamilche, Aside from the 7bit confusion you should take a look at the 'struct' module. I bet it will simplify your life considerably.
#two chars
>>> import struct
>>> struct.pack('cc','A','B')
'AB'
#unsigned short + two chars
>>> struct.pack('Hcc',65535,'a','b')
'\xff\xffab'
Cheers
Lars
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