React fetching data from api, and display as list in real-time – React native

I want to fetch data from my local api, and display with real-time updating.
The fetch and display as list from object, i have, and it works fine, but the list is not updating when new data is available on the api.

Can someon explain to me what is needed in my example, to make real-time updating of data fetching and display?

import React from 'react';
import { StyleSheet, Text, View, ActivityIndicator } from 'react-native';

export default class App extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      isLoading: true,
      dataSource: [],
    }
  }

  componentDidMount() {
    var params = {
      method: 'GET',
      headers: {
        "cache-control": 'no-cache',
        pragma: 'no-cache',
      }
    };

    return fetch('http://192.168.1.54:8000/api/measurement', params)
    .then((response) => response.json())
      .then((responseJson) => {
        this.setState({
          isLoading: false,
          dataSource: responseJson,
        });
      })
      .catch((error) => {
        console.log(error);
      }
    );
  }

  render() {
    if(this.state.isLoading) {
      return (
        <View style={styles.container}>
          <ActivityIndicator />
        </View>
      )
    } else {
      let measurements = this.state.dataSource.map((val, key) => {
        return  <View key={key} style={styles.item}>
                  <Text>{val.hardwareUnit} - {val.measurementType} : {val.value}</Text>
                </View>
      });

      return (
        <View style={styles.container}>
          <Text style={styles.title}>Measurements</Text>
          {/* Display the latest 5 measurements from API */}
          {measurements.slice(Math.max(measurements.length - 5, 0))}
        </View>
      )
    }
  }
}