Abstract: Method, processing node and system for triggering an appropriate action in a detection system. Data tuples comprising an emitter identifier and a timestamp sent from an emitter device are received at a processing node. A period between the timestamp of two of the data tuples provides an indication on status of the emitter device. The data tuples are stored into a memory module. A subset of the data tuples is read or queried from the memory module. The subset of the data tuples is analyzed to identify a pre-determined condition. The appropriate action is triggered when the pre-determined condition is met.