---
title: Building a custom peer-to-peer protocol
framework: network
role: sampleCode
role_heading: Sample Code
path: network/building-a-custom-peer-to-peer-protocol
---

# Building a custom peer-to-peer protocol

Use networking frameworks to create a custom protocol for playing a game across iOS, iPadOS, watchOS, and tvOS devices.

## Overview

Overview This TicTacToe sample code project creates a networked game that you can play between different devices, communicating with a custom protocol. The game offers two ways to play: On Apple TV, the game uses DeviceDiscoveryUI to discover nearby iOS, iPadOS, and watchOS devices. After connecting, you can use your device to play against an AI opponent on Apple TV. On iOS and iPadOS devices, the game uses Bonjour and TLS to establish secure connections between nearby devices. You can use this mode to play a peer-to-peer two-player game. note: This sample code project is associated with WWDC22 session 110339: Build device-to-device interactions with the Network framework. It’s also associated with WWDC 2020 session 10110: Support local network privacy in your app and with WWDC 2019 session 713: Advances in Networking, Part 2.

## See Also

### Network Protocols

- [Connecting iPadOS and visionOS apps over the local network](visionos/connecting-ipados-and-visionos-apps-over-the-local-network.md)
- [NWProtocolTCP](network/nwprotocoltcp.md)
- [NWProtocolTLS](network/nwprotocoltls.md)
- [NWProtocolQUIC](network/nwprotocolquic.md)
- [NWProtocolUDP](network/nwprotocoludp.md)
- [NWProtocolIP](network/nwprotocolip.md)
- [NWProtocolWebSocket](network/nwprotocolwebsocket.md)
- [NWProtocolFramer](network/nwprotocolframer.md)