Fixing escaped characters python-xbee

[pabloblo85 at gmail.com]

> 
> the following in gmane.comp.python.general:
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> 
> 
> > I am using a XBee to receive data from an arduino network.
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> > 
> 
> > But they have AP=2 which means escaped characters are used when a 11 or 13 appears (and some more...)
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> > 
> 
> > When this occurs, XBee sends 7D and inmediatly XOR operation with char and 0x20.
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> > 
> 
> > I am trying to recover the original character in python but I don't know ho to do it.
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> > 
> 
> > I tried something like this:
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> > 
> 
> > 	read = ser.read(4) #Read 4 chars from serial port
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> 
> 
> 	Why read 4 at a time if you need to detect the escape marker...
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> 
> 
> PSEUDO_CODE -- UNTESTED:
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> 
> 
> 	for c in ser.read():	#presumes it will function as an iterator
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> 		if ord(c) == 0x7D:
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> 			c =chr(ord(ser.read(1)) ^ 0x20)
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> 		#do something with c (save to a list for later joining as a
> 
> string?)
> 
> 		#probably need some condition to exit the read loop too
> 
> > def logical_xor(str1, str2):
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> >     return bool(str1) ^ bool(str2)
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> >
> 
> 	bool() returns True or False based on the argument... Any non-empty
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> string will be True. Instead what you want is to x-or the bits of the
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> character itself.
> 
> -- 

It works! Thank you so much. Now I can go ahead with my work!