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it is rpc can use as tools to communicate with server for live chat ?

Hi! Yes, you can use streaming capabilities:
<https://kotlin.github.io/kotlinx-rpc/features.html#send-and-receive-flows|https://kotlin.github.io/kotlinx-rpc/features.html#send-and-receive-flows>

<@U037PBJHYP8> I not familiar with it. Let say for example device A have some delete item from api and call api for update, then device B is it possible to get same data on what device A do?

Yes it is, but what you are talking is not a love chat, but plain network communication. HTTP can do this for you, RPC can do it for you, all depends on concrete needs