code: async def sonar_data_retrieve(self, trigger_pin):
          
          # sonar_pin_entry = self.active_sonar_map[pin]
          sonar_pin_entry = self.active_sonar_map.get(trigger_pin)
          value = sonar_pin_entry[1]
          return value
docs: Retrieve Ping (HC-SR04 type) data. The data is presented as a
          dictionary.
          The 'key' is the trigger pin specified in sonar_config()
          and the 'data' is the current measured distance (in centimeters)
          for that pin. If there is no data, the value is set to None.
  
          :param trigger_pin: key into sonar data map
  
          :returns: active_sonar_map