human
Solve the following python programming problem given the following code:
def _try_upnp(self) : 
    log.debug ('In _try_upnp') 
    def threaded_try_upnp() : 
        if (self.use_upnp is False) : 
            log.debug ('Not using upnp') 
            return False 
u = miniupnpc.UPnP () 
        num_devices_found = u.discover () 
        if (num_devices_found > 0) : 
            u.selectigd () 
            external_ip = u.externalipaddress () 
            if (external_ip != '0.0.0.0') : 
                self.external_ip = external_ip 
if (self.peer_port is not None) : 
                if (u.getspecificportmapping (self.peer_port, 'TCP') is None) : 
                    u.addportmapping (self.peer_port, 'TCP', u.lanaddr, self.peer_port, 'LBRY peer port', '') 
                    self.upnp_redirects.append ((self.peer_port, 'TCP')) 
                    log.info ('Set UPnP redirect for TCP port %d', self.peer_port) 
else : 
                    log.warning ('UPnP redirect already set for TCP port %d', self.peer_port) 
if (self.dht_node_port is not None) : 
                if (u.getspecificportmapping (self.dht_node_port, 'UDP') is None) : 
                    u.addportmapping (self.dht_node_port, 'UDP', u.lanaddr, self.dht_node_port, 'LBRY DHT port', '') 
                    self.upnp_redirects.append ((self.dht_node_port, 'UDP')) 
                    log.info ('Set UPnP redirect for UPD port %d', self.dht_node_port) 
else : 
                    log.warning ('UPnP redirect already set for UDP port %d', self.dht_node_port) 
return True 
return False 
def upnp_failed(err) : 
        log.warning ('UPnP failed. Reason: %s', err.getErrorMessage ()) 
        return False 
d = threads.deferToThread (<MASK>) 
    d.addErrback (upnp_failed) 
    return d 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def threaded_try_upnp(