github_barcode_code

#!/usr/bin/env python
import usb.core
import usb.util
import sys
import requests
import json
import websocket
import time

dev = None
ep = None

def connect_to_scanner():
    # find our zebra device
    dev = usb.core.find(idVendor = 0x05e0, idProduct = 0x0600)

    # was it found ?
    if dev is None:
        print('Device not found (meaning it is disconnected)')
        return (None, None)

    # detach the kernel driver so we can use interface (one user per interface)
    reattach = False
    print(dev.is_kernel_driver_active(0))
    if dev.is_kernel_driver_active(0):
        print("Detaching kernel driver")
        reattach = True
        dev.detach_kernel_driver(0)

    # set the active configuration; with no arguments, the first configuration
    # will be the active one
    dev.set_configuration()

    # get an endpoint instance
    cfg = dev.get_active_configuration()
    interface_number = cfg[(0, 0)].bInterfaceNumber
    alternate_setting = usb.control.get_interface(dev, interface_number)
    intf = usb.util.find_descriptor(
            cfg, bInterfaceNumber = interface_number,
            bAlternateSetting = alternate_setting
    )

    ep = usb.util.find_descriptor(
            intf,
            # match the first OUT endpoint
            custom_match = \
            lambda e: \
                usb.util.endpoint_direction(e.bEndpointAddress) == \
                usb.util.ENDPOINT_IN)

    assert ep is not None
    return (dev, ep)

(dev, ep) = connect_to_scanner()

while 1:
    try:
        # read data
        data = dev.read(ep.bEndpointAddress, ep.wMaxPacketSize * 2, 1000)
        str1 = ''.join(chr(i) if i > 0 and i < 128 else '' for i in data)
        str1 = str1.rstrip()[1:]
        # barcode saved to str
        print(str1)
    except Exception as e:
        error_code = e.args[0]
        # 110 is timeout code, expected
        if error_code == 110:
            print("device connected, waiting for input")
    else:
        print(e)
        print("device disconnected")
        (dev, ep) = connect_to_scanner()
        if dev is None and ep is None:
            time.sleep(1)