Connecting node-bull to redis in codesandbox - MaxRetriesPerRequestError

Question

I'm trying to get example code for a nodejs application using bull running in codesandbox working but struggling to get the application to connect to its redis backend, getting a message Error: MaxRetriesPerRequestError: Reached the max retries per request limit (which is 20).

The node app is copied from a helpful tutorial on medium by Shreshth Bansal: consists of

worker

const helloQueue = require('./queue');

// Function to process the task
async function printHelloWorld(job) {
    // Simulating a task that takes 5 seconds to complete
    setTimeout(() => {
        console.log("Hello, world!");
    }, 5000);
}

// Process jobs in the queue
helloQueue.process(async (job) => {
    await printHelloWorld(job);
});

queue

const Bull = require('bull');

const helloQueue = new Bull('hello', {
    redis: {
        port: 6379,
        host: '127.0.0.1',
    },
});

module.exports = helloQueue;

api

const express = require('express');
const helloQueue = require('./queue');

const app = express();
const port = 3000;

// Endpoint to trigger the background task
app.get('/hello', async (req, res) => {
    try {
        // Add a job to the queue
        await helloQueue.add({});
        res.status(200).json({ message: 'Success' });
    } catch (err) {
        console.error('Error:', err);
        res.status(500).json({ error: 'Internal server error' });
    }
});

app.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});

I followed instructions on how to install redis in a docker container and verified it's running (in a separate container). In this instruction there is no password protection and ports are 0.0.0.0:6379.

Is it better to run the redis backend in the same or separate container - any advice and what's the best way for a sandbox user to add/connect to Redis?

I've tried a couple of potential fixes based on other posted questions:

tls: true enableTLSForSentinelMode:false

added to redis options objected in bull queue, which haven't worked.

While I've used codesandbox quite a bit for node/react applications I have not had much experience/need to add services like redis or diverge from provided templates, nor am I experienced with Docker/containers and the nitty gritty of connecting between containerised services and apps.