def reload_yaml(self):
     config = ConfigManager()
     config.reload_yaml()
     db_handle = self.client['esp8266_workshop']
     # update all groups mac address and degrees
     groups_collection = db_handle['groups']
     for group in range(1, self._number_of_groups + 1):
         group_query = {'number': group}
         groups = []
         for g in groups_collection.find(group_query, {'_id': 0}):
             groups.append(g)
         if len(groups) > 0:
             new_values = {
                 '$set': {
                     'mac': config.get_group_mac_address(group),
                     'degrees': config.get_group_degrees(group)
                 }
             }
             groups_collection.update_one(group_query, new_values)
     db_handle.drop_collection('config')
     config_collection = db_handle['config']
     for config_item in self._config:
         new_config = {
             'name': config_item,
             'value': config.get_item(config_item)
         }
         config_collection.insert_one(new_config)
     db_handle.drop_collection('devices_ip')
     devices_ip_collection = db_handle['devices_ip']
     devices_ip_list = []
     for group in range(1, self._number_of_groups + 1):
         devices_ip_list.append({
             'mac': config.get_group_mac_address(group),
             'ip': ''
         })
     devices_ip_collection.insert_many(devices_ip_list)