...
Use a default site, as some credentials are being changed to a site, then you won't be able to adopt the device (see link)
CLI commands
dmesg
wstalist
List power options:
iwlist ath0 txpower |egrep Current |sed -e 's/^*//'
Set power option:
sed -i 's/^radio.1.txpower_mode=.*/radio.1.txpower_mode=custom/w /tmp/system.cfg' /tmp/system.cfg
sed -i 's/^radio.1.txpower=.*/radio.1.txpower=16/w /tmp/system.cfg' /tmp/system.cfg
save
reboot