If This Then That (IFTTT) is a service that lets you setup triggers between supported services using "Applets". An example would be "If it starts to rain, change my Hue light bulb color to blue."
There are quite a few IFTTT integrations that allow certain sensor readings to trigger an action in another service. One of these services is called "Webhooks". The Webhooks service allows you to make or receive web requests. Since Initial State accepts web requests, you can stream events whenever a certain condition in IFTTT is met.
Choosing your "That"
After selecting your "this", select the Webhooks service as your "that". Select "Make a web request".
In the URL box enter:
Be sure to put your Initial State access key after “accessKey=” and change your bucket key to whatever you want. Treat this the same as streaming via URL parameters now. Add to the end of the URL an "&", stream name, and "=". Click "Add ingredient" and choose the value you want to track.
The Method is “GET”, and leave the Content Type & Body blank.
Inside Initial State
The created bucket must have the same bucket key that you specified in your IFTTT recipe.