root@pine64:~/probert# ifconfig wlan0 down
root@pine64:~/probert# ifconfig wlan1 down
root@pine64:~/probert# python3 probert/network.py
xxx (6, 1)
set_link_flags failed
Traceback (most recent call last):
  File "probert/network.py", line 443, in wlan_event
    self.rtlistener.set_link_flags(ifindex, IFF_UP)
RuntimeError: rtnl_link_change failed -16
xxx (5, 1)
set_link_flags failed
Traceback (most recent call last):
  File "probert/network.py", line 443, in wlan_event
    self.rtlistener.set_link_flags(ifindex, IFF_UP)
RuntimeError: rtnl_link_change failed -16
{1: <__main__.NetworkInfo object at 0x7fa86be630>,
 2: <__main__.NetworkInfo object at 0x7fa86beda0>,
 3: <__main__.NetworkInfo object at 0x7fa86c6588>,
 4: <__main__.NetworkInfo object at 0x7fa86c6cc0>,
 5: <__main__.NetworkInfo object at 0x7fa86c8390>,
 6: <__main__.NetworkInfo object at 0x7fa86c8c18>}
{1: <__main__.NetworkInfo object at 0x7fa86be630>,
 2: <__main__.NetworkInfo object at 0x7fa86beda0>,
 3: <__main__.NetworkInfo object at 0x7fa86c6588>,
 4: <__main__.NetworkInfo object at 0x7fa86c6cc0>,
 5: <__main__.NetworkInfo object at 0x7fa86c8390>,
 6: <__main__.NetworkInfo object at 0x7fa86c8c18>}