code: func (handler *Handler) handleEstablished(msg *pb.ChaincodeMessage, errc chan error) error {
  	if msg.Type == pb.ChaincodeMessage_READY {
  		handler.state = ready
  		return nil
  	}
  	return errors.Errorf("[%s] Chaincode handler cannot handle message (%s) with payload size (%d) while in state: %s", msg.Txid, msg.Type, len(msg.Payload), handler.state)
  }
docs: //handle established state