Rest Services - Receiving the Body from a POST to my Mendix application

Hello Developers,

I'm using the Rest services module from the AppStore with many useful functions. I am currently looking for the right Java call that will extract the Body (JSON) of a POST request sent to my application. The device will send me an "updateStatus" call with a JSON attached to the body. I can currently receive the POST but I can't find the right Java code for extraction from the body.. 

Because of the JSON size throwing it through the header (GetHeader java action) is not a valid (or decent) construction. I've been looking around for a while now and I've decided to ask this question on the forum. My current alternative would be to write the java code myself. 

Gr. Jermaine