Able to get holdings but not Ticks

I am trying to get the latest ticks for the holdings. As far as I understand the implementation should work but I'm not receiving ticks.
I'm able to get the holdings and no errors are generated in the logs however no logs as per ticks are printed on both server and client.

Angular Component:

  ngOnInit() {
    this.socketService.observe('ticks').subscribe(console.log);
    this.socketService.request('holdings').subscribe((holdings: Holding[]) => {
      this.holdings = holdings;
    });
  }

Angular Service:

  request(type: string, data: any = {}) {
    const observer = Observable.create((ob: Observer<any>) => {
      // logged in user token, not access_token from zerodha
      this.socket.on(`${type}-${this.user.token}-success`, (data: any) => ob.next(data));
    }).pipe(take(1));
    this.socket.emit(type, {...data, token: this.user.token});
    return observer;
  }
  observe(type: string) {
    return Observable.create((ob: Observer<any>) => {
      this.socket.on(`${type}-${this.user.token}`, (data: any) => ob.next(data));
    });
  }

NodeJs Server:

  const listenWithZerodha = (eventName, process) => {
    client.on(eventName, async (signal) => {
      // ensure user is logged in and create app object
      process(email, app, signal).then(
        data => client.emit(`${eventName}-${signal.token}-success`, data),
        err => client.emit(`${eventName}-${signal.token}-failure`, err));
    });
  };
  listenWithZerodha('holdings', (email, app, {token}) => app.holdings().then((arr) => {
    // not zerodha, but my app around zerodha
    app.subscribe(arr.map((a) => a.instrument_token), (ticks) => {
      console.log(ticks);
      client.emit(`ticks-${token}`, ticks);
    });
    return arr;
  }));

App implementation:

  async holdings() {
    return this.connect.getHoldings();
  }
  subscribe(stocks, listener) {
    this.ticker.connect();
    this.ticker.subscribe(stocks);
    this.ticker.setMode(this.ticker.modeFull, stocks);
    this.ticker.on('ticks', (...params) => {
      console.log(params);
      listener(...params);
    });
  }

Please let me know if there is a issue in the above implementation.
Also please suggest how can I print zerodha ticker logs in console.