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| Subject | Odd caracteres |
| Date | Wed, 13 Jul 2011 16:19:31 +0200 |
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| From | <remi.druilhe@orange-ftgroup.com> |
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[Multipart message — attachments visible in raw view] - view raw
Hello everyone,
I am using a Python script to get data from a BlueTooth device but it
seems there is some problem when reading from the interface on Linux.
I have a three devices (PowerSpy) that measure energy from an outlet (I
plug a computer on a PowerSpy that I plug on an outlet). This device
communicates using BlueTooth. So I connect my laptop via BT to get those
data (using : sudo rfcomm bind /dev/rfcomm0 powerspy_mac_address).
Then, I execute my Python script. This script reads data
from /dev/rfcomm0 (with root priviledge). The first data is
successfully read. The second and the third too. But the fourth time
that I access /dev/rfcomm0, I get some odd caracteres: A
I tried to access to this interface using minicom, no problem, I can
read easily these data. I changed the computer that was under test, no
change. I changed every physical devices by other, no change.
That's why, I think I have a problem with my script.
Here is the error:
Traceback (most recent call last):
4107A6A
File "./PowerSpy.py", line 64, in <module>
powerspy = PowerSpy("/dev/rfcomm0")
File "./PowerSpy.py", line 33, in __init__
u = (struct.unpack('<f', Ucalib.decode('hex'))[0]) # Unpack in
LittleIndian + float (see IEEE 32-bit float representation)
File "/usr/lib/python2.7/encodings/hex_codec.py", line 42, in
hex_decode
output = binascii.a2b_hex(input)
TypeError: Odd-length string
The python file is in the attachement.
I am using Ubuntu 11.04 with Python 2.7.1+.
Do you have some clues to help me resolving this problem ?
Thanks,
Reg <<orange_logo.gif>> ards,
--
Rémi Druilhe
RD-MAPS-GRE
OLNC/MAPS/SHINE/MADE
Phone: +33 (0)4 76 76 24 27
E-mail : remi.druilhe@orange-ftgroup.com
Orange Labs Grenoble - 28 chemin du Vieux Chêne - BP98 38243 Meylan
Cedex - France
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Odd caracteres <remi.druilhe@orange-ftgroup.com> - 2011-07-13 16:19 +0200
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