Node.js benchmarking with autocannon npm

Question

I have a api that define liveness by checking sended video file. I want to check server strongness by bencmarking with autocannon. I want to send n requests by n concurrent connections(I mean every connection send 1 request per second). it should do this every seconds. But it doesn't this.Autocannon waits for the previous request to finish before starting the new on for every connection. But I want send n requests every per seconds . How to do this with autocannon

import * as autocannon from 'autocannon';
import * as dotenv from 'dotenv';
import FakeData from './mockData';


dotenv.config();
async function startBenchmark() {

const livenessMockData = await FakeData()

const url = "http://localhost:5060";
const numConnections = parseInt(process.env.NUM_CONNECTIONS) || 10;
// const maxConnectionRequests = parseInt(process.env.MAX_COUNT_CONNECTION_REQUESTS)    || 10000;
const connectionRateForEveryConnection = 1;

 let requestNumber = 0;
const instance = await autocannon(
{
  url,
  connections: numConnections,
  connectionRate: connectionRateForEveryConnection,
  duration:20,
  // amount: 20,
  timeout:20,
  headers: {
    'Content-Type': 'application/json'
  },
  requests: [
    {
      method: "POST",
      path: '/check/response',
      headers: {
        'Content-type': 'application/json',
      },
      setupRequest: function (request: any) {
        request.body = JSON.stringify(livenessMockData[requestNumber]);
        console.log('------------ request body -------------')
        console.log(requestNumber + 1, livenessMockData[requestNumber])
        console.log('------------ request body -------------\n')
        requestNumber++
        return request;
      }
    }, 
  ]
},
 finishedBench
);
 function finishedBench(err: any, res: any) {
 console.log('Finished bench: ', res);
 }

 autocannon.track(instance);


 }

 startBenchmark();