How to Subscribe to Platform Event Notifications with React Native - react-native

Question

I am developing a mobile application with React Native. With this application, I connect to salesforce and make transactions.
I created Platform Events on Salesforce side and I want React Native Component to subscribe to it.
I can't use lightning/empApi or CometD because I don't code web. According to the document, my only option is Pub/Sub API.
I tried to pull it directly with FETCH but with no result.
import {View, Text} from 'react-native';
import React, { useEffect, useState } from 'react';
import { Force, oauth } from 'react-native-force';
function History() {
const [session, setSession] = useState()
const eventName = "Test_PE__e";
const replayId = -1;
const [subscription, setSubscription] = React.useState();
useEffect(() => {
oauth.getAuthCredentials(
(data) => console.log(data), // already logged in
() => {
oauth.authenticate(
() => setSession(data),
(error) => console.log('Failed to authenticate:' + error)
);
});
},[]);
return (
<View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}>
<Text> Subscribed to {eventName} </Text>
</View>
);
async function setPEvents(session) {
const headers = new Headers({
'Authorization': `Bearer ${session.accessToken}`,
'Content-Type': 'application/json'
});
const body = {
"event": `/event/${eventName}`,
"replayId": replayId
};
const url = `${session.instanceUrl}/services/data/v57.0/event/${eventName}/subscriptions`;
const requestOptions = {
method: 'POST',
headers: headers,
body: JSON.stringify(body)
};
const resp = await fetch(url, requestOptions)
.then(async (response) => {
console.log(response);
return await response.json();
})
.catch(error => console.log('Error:', error));
setSubscription(resp);
console.log("FIRATTT");
console.log("Result:",resp);
}
}
export default History;
What can I do to subscribe?
Or how can I use the SalesForce Pub/Sub API in React Native?