code: func (c *Connection) LookupByID(msgID uint16) (api.Message, error) {
  	if c == nil {
  		return nil, errors.New("nil connection passed in")
  	}
  
  	if msg, ok := c.msgMap[msgID]; ok {
  		return msg, nil
  	}
  
  	return nil, fmt.Errorf("unknown message ID: %d", msgID)
  }
docs: // LookupByID looks up message name and crc by ID.