WiFi fail safe solution

About

This article describes how to have ability to select AP or STA with jumper.

Hardware

Put jumper between GND and GPIO7 to activate AP mode. Remove to leave in STA mode.

Configuring

Create script /usr/bin/wifi_mode.sh and fill with content

#!/bin/sh

EXPORT='echo 7 > /sys/class/gpio/export'
DIRECTION='echo in > /sys/devices/virtual/gpio/gpio7/direction'

BODY=`cat /sys/devices/virtual/gpio/gpio7/value`;

if [ "$BODY" == 1 ];
then
        echo "AP mode"
        cp /etc/config/wireless_ap /etc/config/wireless
else
        echo "STA mode"
        cp /etc/config/wireless_sta /etc/config/wireless
fi

Create two versions of wireless configuration file. /etc/config/wireless_ap and /etc/config/wireless_sta. Add "option auto 0" to interface configuration.

Run on boot

Edit /etc/rc.local file to be like this:

/usr/bin/wifi_mode.sh
wifi
exit 0