Update dht22 sensing code + sispmctl fixes

roles/pi-dhtsensor/files/dht22_sensing.py

@@ -9,6 +9,31 @@ import Adafruit_DHT
 config = json.load(open("/etc/dht22_sensing.json"))
 
 
+class Filter:
+    def __init__(self, filter_length, max_mean_deviation):
+        self._length = filter_length
+        self.values = []
+        self.max_mean_deviation = max_mean_deviation
+
+    def mean(self):
+        return sum(self.values) / len(self.values)
+
+    def is_valid_value(self, val):
+        if len(self.values) == 0:
+            return True
+        else:
+            return abs(val - self.mean()) < self.max_mean_deviation
+
+    def add_if_valid(self, val):
+        if self.is_valid_value(val):
+            self.values.append(val)
+            if len(self.values) > self._length:
+                self.values.pop(0)
+            return True
+        else:
+            return False
+
+
 def send_to_home_assistant(temperature, humidity):
     # print(f"Sending temperature {temperature}, humidity {humidity}")
     headers = {
@@ -41,9 +66,32 @@ def send_to_home_assistant(temperature, humidity):
     requests.post(humidity_url, json=humidity_data, headers=headers)
 
 
+last_values = []
+
+
+def filter(value):
+    last_values.append(value)
+
+
 if __name__ == "__main__":
+    temp_filter = Filter(10, 5)
+    humidity_filter = Filter(10, 5)
+
     while True:
         sensor = Adafruit_DHT.DHT22
-        humidity, temperature = Adafruit_DHT.read_retry(sensor, config['dht_pin'])
-        send_to_home_assistant(temperature, humidity)
+        humidity, temperature = Adafruit_DHT.read_retry(
+            sensor, config['dht_pin'])
+
+        temp_valid = temp_filter.add_if_valid(temperature)
+        humidity_valid = humidity_filter.add_if_valid(humidity)
+        if not (temp_valid and humidity_valid):
+            print(
+                f"Discarding value {temperature}C  / {humidity}%, because to far from means {temp_filter.mean()}C, {humidity_filter.mean()}%")
+        else:
+            try:
+                send_to_home_assistant(temperature, humidity)
+            except Exception as e:
+                print("Failed sending to home assistant")
+                print(e)
+
         time.sleep(float(config['polling_sleep_time_seconds']))