<How to retrigger an Observable after timer ends i...

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How to retrigger an Observable after timer ends in rxjava?
I have a network call I make as part of a function that fetches the timer value for how long this data is going to be alive (basically the ttl of an object). I need to retrigger the same function as soon as the timer ends.
fun refresh() {
service.makeNetworkCall()
.subscribe { response ->
val ttl = response.ttl
retriggerAgainAfterTtlExpires(ttl)
}

I'm currently retriggering the function in the .doOnNext() call as shown below. But this doesn't chain the observable to the...