Weekend fun project. I've copied wlandevices.sh via FTP to my FritzBox, copied the other two scripts to my Raspberry and added a cron that runs fetch_wlanlist.py (sorry for the name) every 5 minutes. The script checks if known devices are close to the wlan router which is located in our living room and greets the (supposed) user with a warm welc…

fetch_weather.py

#!/usr/bin/env python3

import json
import os
from urllib.request import urlopen


URL = 'http://api.openweathermap.org/data/2.5/weather?id=2953398&lang=de'


def fetch_weatherdata():
    response = urlopen(URL)
    return json.loads(response.read().decode('utf-8'))


def _format_temp(temp):
    temp = temp - 273.15
    temp = '{:.2}'.format(temp)
    return temp.replace('.', ',')


def convert_to_text(data):
    text = ['Das Wetter heute:']
    text.append(data['weather'][0]['description'])
    text.append('bei Temperaturen zwischen')
    text.append(_format_temp(data['main']['temp_min']))
    text.append('und')
    text.append(_format_temp(data['main']['temp_max']))
    text.append('Grad.')
    return ' '.join(text)


if __name__ == '__main__':
    text = convert_to_text(fetch_weatherdata())
    os.system('espeak -v mb-de5 -s 100 "{}"'.format(text))

fetch_wlanlist.py

#!/usr/bin/env python3

import json
import os
import telnetlib

SERVER = 'fritz.box'
PASSWORD = 'secret'
# Location of wlandevices.sh on FritzBox
SCRIPT_PATH = '/var/media/ftp/Kingston-DataTraveler2-0-01/wlandevices.sh'

SCRIPT_DIR = os.path.dirname(__file__)
STATE_FILE = os.path.join(SCRIPT_DIR, 'wlan.state')

TRACKED_DEVICES = {
    '00:00:00:00:00:00': 'andi',
    '00:00:00:00:00:01': 'andi',
    '00:00:00:00:00:02': 'andi',
}


def fetch_raw():
    client = telnetlib.Telnet(SERVER)
    try:
        client.read_until(b'password: ')
        client.write(PASSWORD.encode() + b'\n')
        client.read_until(b'# ')
        client.write(SCRIPT_PATH.encode() + b'\n')
        client.read_until(b'\n')
        return client.read_until(b'# ').decode()[:-2]
    finally:
        client.close()


def parse(raw):
    parsed = {}
    for line in raw.splitlines():
        data = {}
        for entry in line.split(' '):
            key, value = entry.split('=', 1)
            if key in ('state', 'speed', 'quality', 'wlandevice'):
                value = int(value)
            data[key] = value
        mac = data.pop('mac')
        parsed[mac] = data
    return parsed


def retrieve_wlan_devices():
    return parse(fetch_raw())


def read_state_file():
    if not os.path.exists(STATE_FILE):
        return {}
    else:
        with open(STATE_FILE, 'r') as f:
            return json.load(f)


def save_state_file(state):
    with open(STATE_FILE, 'w') as f:
        json.dump(state, f)



def process_updates(oldstate, newstate):
    old_users = oldstate.get('users', {})
    old_devices = oldstate.get('devices', {})
    new_users = {}
    for mac in newstate:
        old_quality = old_devices.get(mac, {'quality': 0})['quality']
        if old_quality > 90:
            continue
        elif old_quality <= 90 and newstate[mac]['quality'] > 90:
            user = TRACKED_DEVICES.get(mac, None)
            if user is not None:
                new_users[user] = True
    for new_user in set(new_users).difference(set(old_users)):
        greet_user(new_user)
    return {'users': new_users, 'devices': newstate}


def greet_user(user):
    os.system('espeak -v mb-de5 -s 100 "Hallo %s. Schön, dass du da bist."' % user)


if __name__ == '__main__':
    prevstate = read_state_file()
    newstate = retrieve_wlan_devices()
    newstate = process_updates(prevstate, newstate)
    save_state_file(newstate)

wlandevices.sh

#!/bin/sh
i=0
count_devices=`ctlmgr_ctl r wlan settings/wlanlist/count`
while [ $i -lt $count_devices ]
do
device="wlandevice="$i
#for command in mac UID state speed rssi quality is_turbo is_guest is_ap ap_state mode wmm_active cipher powersave is_repeater channel freq flags flags_set
for command in mac state speed quality hostname
do
output="`ctlmgr_ctl r wlan settings/wlanlist$i/$command`"
device=$device" "$command"="$output
done
echo $device
let i="i + 1"
done