Answer
Laird would recommend to have supplicant run in the background of Linux so that need to add '&' at the end of the command as below. sdc_supp -iwlan0 -Dnl80211 -s -ddd& Where -i specifies the wireless interface -D enables using nl80211 to communicate with the kernel -s allows logging to syslog -d debug turn on and more 'd' you add, more debugs output you get To dump to file instead of syslog, you may run as below sdc_supp -iwlan0 -Dnl80211 -ddd > /tmp/sdc_supp.txt