code: func (d *GrovePiDriver) Start() (err error) {
  	bus := d.GetBusOrDefault(d.connector.GetDefaultBus())
  	address := d.GetAddressOrDefault(grovePiAddress)
  
  	d.connection, err = d.connector.GetConnection(address, bus)
  	if err != nil {
  		return err
  	}
  
  	return
  }
docs: // Start initialized the GrovePi