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#!/usr/bin/env bash
# call with ESSID and optionally a password
# when called without an ESSID, it will attempt
# to reconnect to a previously chosen network
function connect () {
WPA_PASS_FILE="/tmp/wpa_pass.txt"
PERSISTENT_WIFI_NETWORK_FILE="/home/pi/wifi_network.txt"
CURRENT_WIFI_NETWORK_FILE="/tmp/current_wifi_network.txt" # used to repair connection when we lose it
LOST_WIFI_FILE="/tmp/lost_wifi.txt"
ESSID="${1}"
PASSWORD="${2}"
PERSIST="${3}"
NO_AP="${4}"
sleep 3
sudo pkill -f keep_wifi_alive.sh
WIFI_WAS_LOST=$?
# make network choice persistent
if [ -n "${ESSID}" ] ; then
if [ -n "${PERSIST}" ] ; then
logger -t posbox_connect_to_wifi "Making network selection permanent"
sudo mount -o remount,rw /
echo "${ESSID}" > ${PERSISTENT_WIFI_NETWORK_FILE}
echo "${PASSWORD}" >> ${PERSISTENT_WIFI_NETWORK_FILE}
sudo mount -o remount,ro /
fi
else
logger -t posbox_connect_to_wifi "Reading configuration from ${PERSISTENT_WIFI_NETWORK_FILE}"
ESSID=$(head -n 1 "${PERSISTENT_WIFI_NETWORK_FILE}" | tr -d '\n')
PASSWORD=$(tail -n 1 "${PERSISTENT_WIFI_NETWORK_FILE}" | tr -d '\n')
fi
echo "${ESSID}" > ${CURRENT_WIFI_NETWORK_FILE}
echo "${PASSWORD}" >> ${CURRENT_WIFI_NETWORK_FILE}
logger -t posbox_connect_to_wifi "Connecting to ${ESSID}"
sudo service hostapd stop
sudo killall nginx
sudo service nginx restart
sudo service dnsmasq stop
sudo pkill wpa_supplicant
sudo ifconfig wlan0 down
sudo ifconfig wlan0 0.0.0.0 # this is how you clear the interface's configuration
sudo ifconfig wlan0 up
if [ -z "${PASSWORD}" ] ; then
sudo iwconfig wlan0 essid "${ESSID}"
else
# Necessary in stretch: https://www.raspberrypi.org/forums/viewtopic.php?t=196927
sudo cp /etc/wpa_supplicant/wpa_supplicant.conf "${WPA_PASS_FILE}"
sudo chmod 777 "${WPA_PASS_FILE}"
sudo wpa_passphrase "${ESSID}" "${PASSWORD}" >> "${WPA_PASS_FILE}"
sudo wpa_supplicant -B -i wlan0 -c "${WPA_PASS_FILE}"
fi
sudo systemctl daemon-reload
sudo service dhcpcd restart
# give dhcp some time
timeout 30 sh -c 'until ifconfig wlan0 | grep "inet " ; do sleep 0.1 ; done'
TIMEOUT_RETURN=$?
if [ ${TIMEOUT_RETURN} -eq 124 ] && [ -z "${NO_AP}" ] ; then
logger -t posbox_connect_to_wifi "Failed to connect, forcing Posbox AP"
sudo /home/pi/odoo/addons/point_of_sale/tools/posbox/configuration/wireless_ap.sh "force" &
else
if [ ${TIMEOUT_RETURN} -ne 124 ] ; then
rm -f "${LOST_WIFI_FILE}"
fi
if [ ! -f "${LOST_WIFI_FILE}" ] ; then
logger -t posbox_connect_to_wifi "Restarting odoo"
sudo service odoo restart
fi
if [ ${WIFI_WAS_LOST} -eq 0 ] ; then
touch "${LOST_WIFI_FILE}"
fi
logger -t posbox_connect_to_wifi "Starting wifi keep alive script"
/home/pi/odoo/addons/point_of_sale/tools/posbox/configuration/keep_wifi_alive.sh &
fi
}
connect "${1}" "${2}" "${3}" "${4}" &
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