This will reverse Geo the gps data sent by owntracks and then send it thru mqttwarn to whatever target you specify, https://github.com/jpmens/mqttwarn

functions.owntracks.py

#add this first part to the top of the functions file
#for reversegeo
import time
#import logging
from urllib import urlencode
from urllib2 import urlopen


#this filter will reverse geo the address for you
def OwnTracksConvertWithAdd(data):
    if type(data) == dict:
        tst = data.get('tst', int(time.time()))
        data['tst'] = time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(int(tst)))
        # Remove these elements to eliminate warnings
        for k in ['_type', 'desc']:
            data.pop(k, None)
        whereisthis = getaddress(data)
        data['whereisthis'] = whereisthis
        return "{username} {device} {tst} was last seen at {whereisthis}".format(**data)

class ReverseGeo(object):
    """
    Reverse geocoder using the MapQuest Open Platform Web Service.
    """

    def __init__(self):
        """Initialize reverse geocoder; no API key is required by the
           Nomatim-based platform"""

        self.url = "http://open.mapquestapi.com/nominatim/v1/reverse?format=json&addressdetails=1&%s"
    
    
    def parse_json(self, data):
        try:
            data = json.loads(data)
        except:
            data = {}

        return data

    def reverse(self, lat, lon):

        params = { 'lat': lat, 'lon' : lon }

        url = self.url % urlencode(params)

        data = urlopen(url)
        response = data.read()

        return self.parse_json(response)

def getaddress(data):

    if type(data) == dict and 'lat' in data:
        
        nominatim = ReverseGeo()
        
        lookitup = nominatim.reverse(data['lat'], data['lon'])

#       logging.debug(lookitup)

        fulladdress = lookitup['display_name']
        return str(fulladdress)

    return None

mqttwarn.ini

;add this to the bottom of the mqttwarn.ini file, don't forget to add some more targets.



[owntracks-location]
topic = owntracks/+/+
targets = log:info
datamap = OwnTracksTopic2Data()
format  = OwnTracksConvertWithAdd()

Seriously cool mate - works like a charm!! One little buglette in your notes, you are missing the 'import time' at the top of the functions file. Apart from that, worked first time. Cheers.

@summerboy12 will re-add, was just assuming people where adding it to sample function file.