diff --git a/ch.psi.fda/src/main/java/ch/psi/fda/rest/FdaqEngine.java b/ch.psi.fda/src/main/java/ch/psi/fda/rest/FdaqEngine.java
index a97bbeb..80b6ee0 100644
--- a/ch.psi.fda/src/main/java/ch/psi/fda/rest/FdaqEngine.java
+++ b/ch.psi.fda/src/main/java/ch/psi/fda/rest/FdaqEngine.java
@@ -19,6 +19,7 @@
 package ch.psi.fda.rest;
 
 import java.io.File;
+import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 import javax.inject.Inject;
@@ -40,12 +41,21 @@ public class FdaqEngine {
 	private ZMQDataService zmqService;
 	private boolean stream = false;
 	
+	private ExecutorService eservice;
+	
 	@Inject
 	public FdaqEngine(ZMQDataService zmqService){
 		this.zmqService = zmqService;
+		
+		eservice = Executors.newSingleThreadExecutor();
 	}
 	
 	public void acquire(String trackingId, FdaqRequest request){
+		
+		if(fdaq!=null && fdaq.isRunning()){
+			throw new IllegalStateException("FDAQ is already running");
+		}
+		
 		bus = new AsyncEventBus(Executors.newSingleThreadExecutor());
 		fdaq = new FdaqService(bus);
 
@@ -60,8 +70,13 @@ public class FdaqEngine {
 			bus.register(zmqService);
 		}
 		
-
-		fdaq.acquire();
+		
+		eservice.execute(new Runnable() {
+			@Override
+			public void run() {
+				fdaq.acquire();
+			}
+		});
 	}
 	
 	public void stop(){