wifi measurement go to zero after some time

[vallettea]

I noticed messages are send but no devices are detected

[vallettea]

after killing tcp dump manually and launching it on the command line, nothing is detected:

pi@raspberrypi ~ $ sudo tcpdump -I -e -q -t -U -i wlan0mon
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wlan0mon, link-type IEEE802_11_RADIO (802.11 plus radiotap header), capture size 262144 bytes

[vallettea]

6sense should restart the monitor mode via iw when tcp sump doesn't output anything