How to use the rak811.Rak811 function in rak811

def lora():
    """Instantiate Rak811 class though fixture."""
    with patch('rak811.rak811.Rak811Serial', autospec=True):
        rak811 = Rak811()
        yield rak811
        rak811.close()

def wake_up(ctx):
    """Wake up."""
    lora = Rak811()
    lora.wake_up()
    if ctx.obj['VERBOSE']:
        click.echo('Alive!')
    lora.close()

\b
    Without argument, returns:
        frequency, sf, bw, cr, prlen, pwr

    \b
    Otherwhise set rf_config, Arguments are specified as KEY=VALUE pairs:
        freq: frequency in MHz (860.000-929.900)
        sf: strength factor (6-12)
        bw: bandwidth (0:125KHz, 1:250KHz, 2:500KHz)
        cr: coding rate (1:4/5, 2:4/6, 3:4/7, 4:4/8)
        prlen: preamble length default (8-65535)
        pwr: Tx power (5-20)
    E.g.: rf-config freq=860.100 sf=7 pwr=16

    """
    lora = Rak811()
    config = dict(key_values)
    if config == {}:
        # No parameters: returns rc_config
        config = lora.rf_config
        if ctx.obj['VERBOSE']:
            click.echo('Frequency: {}'.format(config['freq']))
            click.echo('SF: {}'.format(config['sf']))
            click.echo('BW: {}'.format(config['bw']))
            click.echo('CR: {}'.format(config['cr']))
            click.echo('PrLen: {}'.format(config['prlen']))
            click.echo('Power: {}'.format(config['pwr']))
        else:
            click.echo('{} {} {} {} {} {}'.format(
                config['freq'], config['sf'], config['bw'], config['cr'],
                config['prlen'], config['pwr']
            ))

def join_otaa(ctx):
    """Join the configured network in OTAA mode."""
    lora = Rak811()
    try:
        lora.join_otaa()
        if ctx.obj['VERBOSE']:
            click.echo('Joined in OTAA mode')
    except Rak811Error as e:
        print_exception(e)
    lora.close()

def hard_reset(ctx):
    """Hardware reset of the module.

    Hard reset should not be required in normal operation. It needs to be
    issued once after host boot, or module restart.
    """
    lora = Rak811()
    lora.hard_reset()
    if ctx.obj['VERBOSE']:
        click.echo('Hard reset complete')
    lora.close()

def link_cnt(ctx):
    """Get up & downlink counters."""
    lora = Rak811()
    (uplink, downlink) = lora.link_cnt
    if ctx.obj['VERBOSE']:
        click.echo('Uplink: {0} - Downlink: {1}'.format(uplink, downlink))
    else:
        click.echo('{} {}'.format(uplink, downlink))
    lora.close()

def dr(ctx, dr):
    """Get/Set next send data rate."""
    lora = Rak811()
    if dr is None:
        click.echo(lora.dr)
    else:
        try:
            lora.dr = dr
            if ctx.obj['VERBOSE']:
                click.echo('Data rate set to {0}.'.format(dr))
        except Rak811Error as e:
            print_exception(e)
    lora.close()

def rx_get(ctx, timeout, json):
    """Get LoraP2P message."""
    lora = Rak811()
    lora.rx_get(timeout)
    if lora.nb_downlinks:
        rx = lora.get_downlink()
        rx['data'] = rx['data'].hex()
        if json:
            click.echo(dumps(rx, indent=4))
        elif ctx.obj['VERBOSE']:
            click.echo('Message received:')
            if rx['rssi']:
                click.echo('RSSI: {}'.format(rx['rssi']))
                click.echo('SNR: {}'.format(rx['snr']))
            click.echo('Data: {}'.format(rx['data']))
        else:
            click.echo(rx['data'])
    elif ctx.obj['VERBOSE']:
        click.echo('No message available.')

def clear_radio_status(ctx):
    """Clear radio statistics."""
    lora = Rak811()
    lora.clear_radio_status()
    if ctx.obj['VERBOSE']:
        click.echo('Radio statistics cleared.')
    lora.close()

def version(ctx):
    """Get module version."""
    lora = Rak811()
    click.echo(lora.version)
    lora.close()