Notices

#!/usr/bin/env python

# This program connects to a Baracoda Pencil2 Bluetooth UPC scanner,
# polls for barcodes, xml-rpc queries upcdatabase.com, then prints UPC metadata.
# I've tested this on my lenny debian desktop and Nokia N810 
# (RX-44_DIABLO_4.2008.23-14_PR_COMBINED_MR0_ARM.bin)
#
# I didn't use any Baracoda libs, just read the Pencil2 protocol doc and figured
# out how to talk to the scanner. Open box to barcode metadata printouts = 3 hou


import bluetooth, time, traceback, sys
from xmlrpclib import ServerProxy, ProtocolError

# I'm connecting to a Baracoda Pencil 2, got the bt id from the unit, confirmed 
# with desktop hcitool.
host = '00:A0:96:18:A7:64' # can scan for this, but hardcoding for faster connec
name = 'Spp'
port = 1
print "connecting to \"%s\" on %s" % (name, host)
sock=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
sock.connect((host, port))
sock.settimeout(2.0) # keep us from hanging around too long

# I'm setting frame prefix and suffix to find my barcode data in the char stream
# see Pencil2 communications protocol document
#prefix set
sock.send(chr(0xEC)+chr(0x00)+chr(0x02)+chr(0x01)+chr(0x01))
#suffix set
sock.send(chr(0xF0)+chr(0x00)+chr(0x02)+chr(0x01)+chr(0x04))
#data format set
sock.send(chr(0xE8)+chr(0x00)+chr(0x01)+chr(0x07))
data = sock.recv(1024) # throw away all the results

upc = ""
while True:
    try:
        data = sock.recv(100) # this here is binary data, you may not get it all
        for c in data:
            o = ord(c)
            if o > 33 and o < 126:
                print "0x%02X %3d %s"%(o,o,c)
            else:
                print "0x%02X %3d"%(o,o)
            if o == 0x01: # prefix is 0x01
                upc = ""
                continue
            if o == 0x04: # suffix is 0x04, upc now has a valid number
                l = len(upc)
                print ">%s<"%upc, l
                while True:
                    try:
                        server = ServerProxy("http://dev.upcdatabase.com/rpc")
                        if l == 8:
                            reply = server.lookupEAN(server.convertUPCE(upc))
                        elif l == 12:
                            ean = server.calculateCheckDigit(upc[:-1]+"C")
                            reply = server.lookupEAN(ean)
                        elif l == 13:
                            reply = server.lookupEAN(upc)
                        else:
                            print 'not a valid UPC code'
                            break;
                            #oldschool, reply = server.lookupUPC(upc)
                        #print server.help()
                        #print reply
                        if reply['found'] == True:
                            keys = reply.keys() # sort the keys and print alphab
                            keys.sort()
                            for key in keys:
                                print "%-20s %s"%(key,reply[key])
                        if reply['found'] == False:
                            print 'not found'
                        break
                    except ProtocolError,e: 
                        print 'server return error',e,' retrying in 5 seconds'
                        time.sleep(5)
                    except:
                        traceback.print_exc(file=sys.stdout)
                        break

            upc += c
    except bluetooth.BluetoothError:
        pass # this is normal
    except KeyboardInterrupt:
        break
    except:
        traceback.print_exc(file=sys.stdout)
    

# xml-rpc help 
#  help - returns string
#          Show available functions and their parameters.
#  
#  lookupEAN(ean string) - returns struct
#          Lookup upc database entry.
#  
#  lookupUPC(upc string) - returns struct
#          Lookup upc database entry.
#          DEPRECATED!  Use 'lookupEAN' instead.
#  
#  writeEntry(username string, password string, ean string, description string, 
#          Add or modify an entry in the database.
#          This function is unimplemented at this time,
#          but is here for API review.
#  
#  calculateCheckDigit(partialean string) - returns string
#          Parameter 'ean' should have 'C' or 'X' in
#          place of the check digit (last character).
#          Length of 'partialean' parameter should be
#          11 or 12 digits, plus 'X' or 'C' character.
#  
#  convertUPCE(upce string) - returns string
#          Parameter 'upce' should be exactly 8 digits.
#          Returns full EAN-13.
#  
#  decodeCueCat(cuecatscan string) - returns struct
#          Returns serial number, type, and code given
#          CueCat scanner output.
#  
#  latestDownloadURL - returns string
#          Return URL of latest full database download.
#  
#  All 'upc' parameters should be 12 digits long.
#  All 'ean' parameters should be 13 digits long.


'''
/* Copyright (C) 2008 by Craig Hollabaugh
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
'''

Nokia-N810-23-14:~# ./upcdemo.py 
connecting to "Spp" on 00:A0:96:18:A7:64
0xF0 240
0x00   0
0x01   1
0x01   1
0xE8 232
0x00   0
0x01   1
0x01   1
0x32  50 2
0x00   0
0x16  22
0x30  48 0
0x30  48 0
0x30  48 0
0x38  56 8
0x30  48 0
0x31  49 1
0x31  49 1
0x30  48 0
0x32  50 2
0x36  54 6
0x32  50 2
0x33  51 3
0x01   1
0x30  48 0
0x31  49 1
0x32  50 2
0x32  50 2
0x33  51 3
0x31  49 1
0x30  48 0
0x31  49 1
0x04   4
>01223101< 8
/usr/lib/python25.zip/xmllib.py:9: DeprecationWarning: The xmllib module is obso
description          Diet Pepsi
ean                  0012000002311
found                True
isCoupon             False
issuerCountry        United States
issuerCountryCode    us
lastModified         2005-07-19 15:21:08
message              Database entry found
mfrGLN               0120000000036
pendingUpdates       0
size                 2 liter
upc                  012000002311
upce                 01223101