root@camera:/etc/network# ifup wlan0
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

RTNETLINK answers: Operation not possible due to RF-kill
Listening on LPF/wlan0/00:14:a5:73:c0:bb
Sending on   LPF/wlan0/00:14:a5:73:c0:bb
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
send_packet: Network is down
dhclient.c:1966: Failed to send 300 byte long packet over wlan0 interface.
receive_packet failed on wlan0: Network is down
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
send_packet: Network is down
dhclient.c:1966: Failed to send 300 byte long packet over wlan0 interface.
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
send_packet: Network is down
dhclient.c:1966: Failed to send 300 byte long packet over wlan0 interface.