Remove lock and add host timeout to NMAP scanner

homeassistant/components/device_tracker/nmap_tracker.py

@@ -1,7 +1,6 @@
 """ Supports scanning using nmap. """
 import logging
 from datetime import timedelta, datetime
-import threading
 from collections import namedtuple
 import subprocess
 import re
@@ -54,7 +53,6 @@ class NmapDeviceScanner(object):
     def __init__(self, config):
         self.last_results = []
 
-        self.lock = threading.Lock()
         self.hosts = config[CONF_HOSTS]
         minutes = convert(config.get(CONF_HOME_INTERVAL), int, 0)
         self.home_interval = timedelta(minutes=minutes)
@@ -116,10 +114,9 @@ class NmapDeviceScanner(object):
         if not self.success_init:
             return False
 
-        with self.lock:
         _LOGGER.info("Scanning")
 
-            options = "-F"
+        options = "-F --host-timeout 5"
         exclude_targets = set()
         if self.home_interval:
             now = datetime.now()