code: def _on_connection_finished(self, result):
          
  
          success, retval, context = self._parse_return(result)
          conn_id = context['connection_id']
          callback = context['callback']
  
          if success is False:
              callback(conn_id, self.id, False, 'Timeout opening connection')
  
              with self.count_lock:
                  self.connecting_count -= 1
              return
  
          handle = retval['handle']
          context['disconnect_handler'] = self._on_connection_failed
          context['connect_time'] = time.time()
          context['state'] = 'preparing'
          self._connections[handle] = context
  
          self.probe_services(handle, conn_id, self._probe_services_finished)
docs: Callback when the connection attempt to a BLE device has finished
  
          This function if called when a new connection is successfully completed
  
          Args:
              event (BGAPIPacket): Connection event