code: func (p *Peer) LastPingNonce() uint64 {
  	p.statsMtx.RLock()
  	lastPingNonce := p.lastPingNonce
  	p.statsMtx.RUnlock()
  
  	return lastPingNonce
  }
docs: // LastPingNonce returns the last ping nonce of the remote peer.
  //
  // This function is safe for concurrent access.