Adding retry feature to mobile apiFetch handler

src/api-fetch-setup.js

@@ -10,7 +10,9 @@ import { fetchRequest } from 'react-native-gutenberg-bridge';
  */
 import apiFetch from '@wordpress/api-fetch';
 
-const fetchHandler = ( { path } ) => {
+const setTimeoutPromise = ( delay ) => new Promise( ( resolve ) => setTimeout( resolve, delay ) );
+
+const fetchHandler = ( { path }, retries = 20 ) => {
 	if ( ! isPathSupported( path ) ) {
 		return Promise.reject( `Unsupported path: ${ path }` );
 	}
@@ -27,7 +29,12 @@ const fetchHandler = ( { path } ) => {
 	return responsePromise.then( parseResponse ).catch( ( error ) => {
 		// eslint-disable-next-line no-console
 		console.warn( 'Network Error: ', error );
-		return Promise.resolve( error );
+		if ( error.code >= 400 && error.code < 600 ) {
+			return Promise.reject( error );
+		} else if ( retries === 0 ) {
+			return Promise.reject( error );
+		}
+		return setTimeoutPromise( 2000 ).then( () => fetchHandler( { path }, retries - 1 ) );
 	} );
 };