MQTT Client as a grain

[qazwsxedckll]

Here is my usecase. The user can create many MQTT clients on the web and subscribe to some topics. So my first thought is to create a grain for each MQTT client and when the node is down I need to reactivate the grain and subscribe to the topics again. Since subscribing is an active action, no one is actually calling the grain. The grain is not going to be reactivated. Am I doing this all wrong? Any other solutions?