Update sensor config from api; CO2 Sensor; Refactor & Tidy-Up

RaspberryPi_Receiver/Pi_Receiver.py

@@ -126,7 +126,7 @@ class Co2(object):
 class API():
     def getSensorConfig(self, sensorUID):
         headers = {'Content-Type': 'Application/json'}
-        response = requests.post(API_URL + '/api/' + secrets.API_KEY + '/sensor/getConfig/' + sensorUID, headers=headers)
+        response = requests.post(API_URL + '/' + secrets.API_KEY + '/sensor/getConfig/' + sensorUID, headers=headers)
 
         if (response.status_code != 200):
             return None
@@ -282,8 +282,9 @@ def ackMsg(sensorResponse):
 
     # Retrieve up-to-date sensor config from API & Transmit back to sensor
     updated_sensor_config = API().getSensorConfig(sensorResponse.sensorMetadata.uid)
-    data.updateConfigPollingFrequency(updated_sensor_config['txAfterNReadings'])
-    data.updateConfigTxAfterNReadings(updated_sensor_config['pollingFrequency'])
+    if updated_sensor_config is not None:
+        data.updateConfigPollingFrequency(updated_sensor_config['txAfterNReadings'])
+        data.updateConfigTxAfterNReadings(updated_sensor_config['pollingFrequency'])
 
     if DEBUG > 1:
         print(data.ToJson())