suspend fun requestStepsActivity(): List<Something> = suspendCancellableCoroutine { emitter ->
    val listener = object : SimpleEventListener() {
        override fun onSent() {
            emitter.resume(Something)
        }
        override fun onFailedSending() {
            emitter.resumeWithException(RuntimeException())
        }
    }

    try {
        someApi.addListener(listener)
        someApi.requestData()
    } catch (e: Throwable) {
        emitter.resumeWithException(e)
    } finally {
        someApi.removeListener(listener)
    }
}

requestData

suspend fun requestStepsActivity(): List<Something> = suspendCancellableCoroutine { emitter ->
    val listener = object : SimpleEventListener() {
        override fun onSent() {
            cleanUp()
            emitter.resume(Something)
        }
        override fun onFailedSending() {
            cleanUp()
            emitter.resumeWithException(RuntimeException())
        }
    }

    emitter.invokeOnCancellation { cleanUp() }

    try {
        someApi.addListener(listener)
        someApi.requestData()
    } catch (e: Throwable) {
        cleanUp()
        emitter.resumeWithException(e)
    }
    
    fun cleanUp(){
        someApi.removeListener(listener)
    }
}

someApi

someApi

emitter