Unable to call the nested function with timer until met condition using angular

here my scenario i have 2 methods calling apis

1. getData(param)

2. getAnotherData(resp from get data);

The below method calls the first method

`

this.service.getData(param).subscribe(res => {
this.variable = res;

// here based on the first response i will call the second api 

this.service.getAnotherData(this.variable['data]).subscribe(res2 =>  

 // here i will get response as "started"  here my issue is when response is not **"started"** i have to 
   call this api until i get the response as **started**  up to 1 minute i have to call this api if 
   didnt get message as started 

)})`

so how can i achieve this ?

from Unable to call the nested function with timer until met condition using angular