# Uses wpa_supplicant to check for association to a network
# wpa_check interface [timeout]
wpa_check()
{
    local timeout=0 INTERFACE=$1 TIMEOUT=${2:-15}
    
    while [[ $timeout -lt $TIMEOUT ]]; do
        (
        eval `wpa_cli status|grep wpa_state` 
        [[ "$wpa_state" = "COMPLETED" ]] 
        ) && return 0
        sleep 1
        let timeout++
    done

    wpa_cli terminate >/dev/null 2>&1
    err_append "Authentication/association failed"
    return 1 
}

start_wpa() 
{
    INTERFACE="$1"; WPA_CONF="$2"; WPA_OPTS="$3"

    wpa_supplicant -wB -P/var/run/wpa_supplicant_${INTERFACE}.pid -i"${INTERFACE}" -c "$WPA_CONF" $WPA_OPTS    
    sleep 1
    
    if [[ ! -f "/var/run/wpa_supplicant_${INTERFACE}.pid" ]]; then
        err_append "wpa_supplicant did not start, possible configuration error"
        return 1
    fi
}