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chore(rln-relay): Changes the test scenario of testnet2 tutorial to one chat user (#1261)

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* changes the test scenario to one chat user

* minor rewording

* deletes a  surplus newline
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docs/tutorial/rln-chat-cross-client.md
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# Waku-RLN-Relay Testnet2: Cross-Client # Waku-RLN-Relay Testnet2: Cross-Client
In this tutorial, the aim is to test the interoperability of the 3 available Waku v2 clients namely, Nim, Go, and JS over the Waku network in the spam-protected mode. In this tutorial, the aim is to test the interoperability of the 3 available Waku v2 clients namely, Nim, Go, and JS over the Waku network in the spam-protected mode.
Spam protection is done by rate limiting each message publisher. Spam protection is done by rate-limiting each message publisher.
At the time of this tutorial, the messaging rate is set to `1` per Epoch where Epoch duration is set to `10` seconds. At the time of this tutorial, the messaging rate is set to `1` per Epoch where Epoch duration is set to `10` seconds.
You will find more about the details of spam protection in the chat clients tutorial provided below. You will find more about the details of spam protection in the chat clients tutorial provided below.
Messaging rate/spam protection is enabled through [Waku-RLN-Relay protocol](https://rfc.vac.dev/spec/17/) that is mounted on the routing hops. Messaging rate/spam protection is enabled through [Waku-RLN-Relay protocol](https://rfc.vac.dev/spec/17/) that is mounted on the routing hops.
For ease of demonstration, we make use of Nim-chat, Go-chat, and JS-chat applications that are developed on top of their respective Waku v2 clients. For ease of demonstration, we make use of Nim-chat, Go-chat, and JS-chat applications that are developed on top of their respective Waku v2 clients.
You will need to set up one instance of each chat client in spam-protected mode and then start messaging with them.
You need to set up a chat application in spam-protected mode and then start messaging with it.
As for the setup, please follow the tutorials below: As for the setup, please follow the tutorials below:
- [Nim-chat](./onchain-rln-relay-chat2.md) - [Nim-chat](./onchain-rln-relay-chat2.md)
- [Go-chat](https://github.com/status-im/go-waku/blob/master/docs/tutorials/rln.md) - [Go-chat](https://github.com/status-im/go-waku/blob/master/docs/tutorials/rln.md)
- [JS-chat](https://examples.waku.org/rln-js/) - [JS-chat](https://examples.waku.org/rln-js/)
Once you set up your chat clients, they will all be connected to the Waku v2 test fleets as their first hop. Once you set up your chat client, it will be connected to the Waku v2 test fleets as its first hop.
Messages generated by all the chat clients are set to be published on a specific combination of pubsub and content topic i.e., the default pubsub topic of `/waku/2/default-waku/proto` and the content topic of `/toy-chat/2/luzhou/proto`. Messages generated by the chat client are set to be published on a specific combination of pubsub and content topic i.e., the default pubsub topic of `/waku/2/default-waku/proto` and the content topic of `/toy-chat/2/luzhou/proto`.
The test fleets also run Waku-RLN-Relay over the same pubsub topic and content topic. The test fleets also run Waku-RLN-Relay over the same pubsub topic and content topic.
Test fleets act as routers and enforce the message rate limit. Test fleets act as routers and enforce the message rate limit.
As such, any spam messages published by the chat clients on the said combination of topics will be caught by the Waku v2 test fleet nodes and will not be routed. As such, any spam messages published by a chat client on the said combination of topics will be caught by the Waku v2 test fleet nodes and will not be routed.
You may also run multiple chat instances from the same or different client implementations to better observe the spam protection done by the Waku v2 test fleets.
Note that spam protection does not rely on the presence of the test fleets. Note that spam protection does not rely on the presence of the test fleets.
In fact, all the chat clients (except js-chat as it is in progress) are also capable of catching and dropping spam messages if they receive any. In fact, all the chat clients (except js-chat as it is in progress) are also capable of catching and dropping spam messages if they receive any.
You can test it by connecting two chat clients (running Waku-RLN-Relay) directly to each other and see if they can spot each other's spam activities. You can test it by connecting two chat clients (running Waku-RLN-Relay) directly to each other and see if they can spot each other's spam activities.