connection.go
func (c *Connection) getLastActivityTime() time.Time {
	return time.Unix(0, c.lastActivity.Load())
}
func (c *Connection) getLastActivityTime() time.Time {
	return time.Unix(0, c.lastActivity.Load())
}
// getLastActivityTime returns the timestamp of the last frame read or written,
// excluding pings. If no frames were transmitted yet, it will return the time
// this connection was created.