diff --git a/collector.py b/collector.py
index 20b57a3..9a0ef53 100644
--- a/collector.py
+++ b/collector.py
@@ -3,6 +3,7 @@ import json
 import logging
 import paho.mqtt.client as mqtt
 import time
+from multiprocessing import Process
 from typing import Any, Callable, Dict, Iterator
 log = logging.getLogger(__name__)
 
@@ -32,20 +33,25 @@ class Collector:
         self._online = {}
         self._collected = {}
         self._client = mqtt.Client()
+        self._previous_process = None
+        self._current_process = None
+        self.callback = self._callback
         log.info("New %s object created to connect to %s:%s and TLS support set to %s.",
                  Collector.__name__, self._host, self._port, self._tls)
 
     def add_sensor(self, sensor: str, key: str, *,
-                   stale: bool = False, max_hours: int = 0, same_day: bool = False) -> None:
+                   stale: bool = False, max_hours: int = 0, same_day: bool = False, 
+                   dumb: bool = False) -> None:
         """ Add the topic of a sensor, and the key to access its value.
         :param sensor: the topic of the sensor to listen to.
         :param key: the key to access the value of the sensor.
         :param stale: flag indicating whether stale results are acceptable.
         :param max_hours: (when stale is allowed) the maximum hours staleness to tolerate.
-        :param same_day: (when stale is allowed) whether stale info is only allowed on the same day. """
+        :param same_day: (when stale is allowed) whether stale info is only allowed on the same day. 
+        :param dumb: whether this is a dumb source which does not have any availability information: enforces unlimited stale"""
         log.info("Adding sensor %s accessible through the key %s", sensor, key)
         self._sensors.append((sensor, key))
-        self._stale_allowed[key] = (stale, max_hours, same_day)
+        self._stale_allowed[key] = (stale, max_hours, same_day, dumb)
 
     def connect(self) -> None:
         """ Start a non-blocking connection to the MQTT broker. This will also
@@ -60,6 +66,7 @@ class Collector:
         log.info("Creating the callbacks for each specified sensor.")
         for sensor, key in self._sensors:
             self._client.message_callback_add(sensor, self._create_handler(key))
+            self._online[key] = True
 
         log.info("Asynchronously starting the connection to the MQTT broker.")
         self._client.loop_start()
@@ -123,8 +130,11 @@ class Collector:
         if key in self._online and self._online[key] is True:
             result = self._collected.get(key, None)
         elif key in self._collected:
-            stale, max_hours, same_day = self._stale_allowed.get(key, (False, 0, False))
-            if stale:
+            stale, max_hours, same_day, dumb = self._stale_allowed.get(key, (False, 0, False, False))
+            if dumb:
+                # no need to check the liveliness of the sensor, just give the result
+                result = self._collected[key]
+            elif stale:
                 last_updated = self._collected[key]["lastupdated"]
                 if last_updated:  # verify that we definitely have the information on the last update time
                     datetime_key = datetime.strptime(last_updated, '%Y-%m-%dT%H-%M-%S')
@@ -146,7 +156,8 @@ class Collector:
 
     def _process(self, message: mqtt.MQTTMessage, key: str) -> None:
         topic = message.topic
-        payload = message.payload.decode("utf-8")
+        # hack the JSON: convert single quotes into double quotes as needed
+        payload = message.payload.decode("utf-8").replace("'", '"')
 
         if topic.endswith("/status"):
             self._online[key] = payload == "on"
@@ -156,9 +167,17 @@ class Collector:
         elif topic.endswith("/value"):
             self._collected[key] = json.loads(payload)
             log.debug("Changed the value of %s to %s.", topic, json.loads(payload))
+            if self._previous_process:
+                self._previous_process.terminate()
+            self._previous_process = self._current_process
+            self._current_process = Process(target=self.callback)
+            self._current_process.start()
 
     def _create_handler(self, key: str) -> Callable[[mqtt.Client, Any, mqtt.MQTTMessage], None]:
         def handler(_client: mqtt.Client, _userdata: Any, message: mqtt.MQTTMessage):
             self._process(message, key)
 
         return handler
+
+    def _callback(self):
+        pass
diff --git a/publisher.py b/publisher.py
index e207863..1c2229c 100644
--- a/publisher.py
+++ b/publisher.py
@@ -39,6 +39,13 @@ UVINDEX_SENSE = 128
 ICON_SENSE = 256
 ICON_3H_SENSE = 512
 ICON_6H_SENSE = 1024
+APPARENT_SENSE = 2048
+WINDGUSTS_SENSE = 4096
+CLOUDCOVER_SENSE = 8192
+RAIN_INTENSITY_SENSE = 16384
+RAIN_PROBABILITY_SENSE = 32768
+SOLAR_RADIATION_SENSE = 65536
+
 
 # Constants used to create a family of light sensors.
 # This can be switched to enum.Flag as of Python 3.6.
@@ -277,7 +284,7 @@ class Publisher:
         :return: a Payload object, which can be used to set the Payload
                  for this type of weather sensor with the given version. """
         """The version of a sensor is given as a bit mask."""
-        if version < 1 or version > 2047:
+        if version < 1 or version > 131071:
             raise ValueError("Version type too low or too high.")
 
         senses = [(TEMPERATURE_SENSE, "temperature"),
@@ -290,7 +297,14 @@ class Publisher:
                   (UVINDEX_SENSE, "uvindex"),
                   (ICON_SENSE, "icon"),
                   (ICON_3H_SENSE, "icon_3h"),
-                  (ICON_6H_SENSE, "icon_6h")]
+                  (ICON_6H_SENSE, "icon_6h"),
+                  (APPARENT_SENSE, "apparent_temperature"),
+                  (WINDGUSTS_SENSE, "windgusts"),
+                  (CLOUDCOVER_SENSE, "cloud_cover"),
+                  (RAIN_INTENSITY_SENSE, "rain_intensity"),
+                  (RAIN_PROBABILITY_SENSE, "rain_probability"),
+                  (SOLAR_RADIATION_SENSE, "solar_radiation")
+        ]
 
         keys = []