code: func (c *Connection) SendTickerInterval() int64 {
  	if c.hbd == nil {
  		return 0
  	}
  	return c.hbd.sti / 1000000
  }
docs: /*
  	SendTickerInterval returns any heartbeat send ticker interval in ms.  A return
  	value of zero means	no heartbeats are being sent.
  */