def beacon(config):
    '''
    Emit the status of all devices returned by adb

    Specify the device states that should emit an event,
    there will be an event for each device with the
    event type and device specified.

    .. code-block:: yaml

        beacons:
          adb:
            - states:
                - offline
                - unauthorized
                - missing
            - no_devices_event: True
            - battery_low: 25

    '''

    log.trace('adb beacon starting')
    ret = []

    _validate = validate(config)
    if not _validate[0]:
        return ret

    out = __salt__['cmd.run']('adb devices', runas=config.get('user', None))

    lines = out.split('\n')[1:]
    last_state_devices = last_state.keys()
    found_devices = []

    for line in lines:
        try:
            device, state = line.split('\t')
            found_devices.append(device)
            if device not in last_state_devices or \
                    (last_state[device] in 'state' and last_state[device]['state'] != state):
                if state in config['states']:
                    ret.append({'device': device, 'state': state, 'tag': state})
                    last_state[device] = {'state': state}

            if 'battery_low' in config:
                val = last_state.get(device, {})
                cmd = 'adb -s {0} shell cat /sys/class/power_supply/*/capacity'.format(device)
                battery_levels = __salt__['cmd.run'](cmd, runas=config.get('user', None)).split('\n')

                for l in battery_levels:
                    battery_level = int(l)
                    if 0 < battery_level < 100:
                        if 'battery' not in val or battery_level != val['battery']:
                            if ('battery' not in val or val['battery'] > config['battery_low']) and \
                                            battery_level <= config['battery_low']:
                                ret.append({'device': device, 'battery_level': battery_level, 'tag': 'battery_low'})

                        if device not in last_state:
                            last_state[device] = {}

                        last_state[device].update({'battery': battery_level})

        except ValueError:
            continue

    # Find missing devices and remove them / send an event
    for device in last_state_devices:
        if device not in found_devices:
            if 'missing' in config['states']:
                ret.append({'device': device, 'state': 'missing', 'tag': 'missing'})

            del last_state[device]

    # Maybe send an event if we don't have any devices
    if 'no_devices_event' in config and config['no_devices_event'] is True:
        if len(lines) == 0 and not last_state_extra['no_devices']:
            ret.append({'tag': 'no_devices'})

    # Did we have no devices listed this time around?

    last_state_extra['no_devices'] = len(lines) == 0

    return ret
dataset/ETHPy150Open saltstack/salt/salt/beacons/adb.py/beacon/swapped operands of `in`