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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def connect():
 """Try to connect to the router. Returns: u (miniupnc.UPnP):
 the connected upnp-instance router (string):
 the connection information """

    upnp = miniupnpc.UPnP()
    upnp.discoverdelay = 200
    providers = upnp.discover()
    if providers > 1:
        log.debug('multiple upnp providers found', num_providers=providers)
    elif providers < 1:
        log.error('no upnp providers found')
        return None

    try:
        location = upnp.selectigd()
        log.debug('connected', upnp=upnp)
    except Exception as e:
        log.error('Error when connecting to uPnP provider', exception_info=e)
        return None

    if not valid_mappable_ipv4(upnp.lanaddr):
        log.error('could not query your lanaddr', reported=upnp.lanaddr)
        return None
    try:  # this can fail if router advertises uPnP incorrectly
        if not valid_mappable_ipv4(upnp.externalipaddress()):
            log.error('could not query your externalipaddress', reported=upnp.externalipaddress())
            return None
        return upnp, location
    except Exception:
        log.error('error when connecting with uPnP provider', location=location)
        return None