diff --git a/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Application.java b/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Application.java
index 3c64bfc..c1d3ae2 100644
--- a/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Application.java
+++ b/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Application.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2017, 2019 Red Hat Inc and others.
+ * Copyright (c) 2017, 2020 Red Hat Inc and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -16,6 +16,9 @@
 
 import java.util.Optional;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import de.dentrassi.hono.demo.common.AppRuntime;
 import de.dentrassi.hono.demo.common.DeadlockDetector;
 import de.dentrassi.hono.demo.common.Payload;
@@ -38,6 +41,8 @@
 
 public class Application {
 
+    private static final Logger logger = LoggerFactory.getLogger(Application.class);
+
     private static final ProducerConfig config = ProducerConfig.fromEnv();
 
     private static final String METHOD = Environment.get("HTTP_METHOD").orElse("PUT");
@@ -97,6 +102,8 @@ private static void runSimulator(final AppRuntime runtime) throws InterruptedExc
             final String username = String.format("user-%s-%s", deviceIdPrefix, i);
             final String deviceId = String.format("%s-%s", deviceIdPrefix, i);
 
+            logger.debug("Starting device - deviceId: {}, authId: {}", deviceId, username);
+
             final var request = createRequest(webClient, config, Payload.payload(), Tenant.TENANT, deviceId,
                     username, PASSWORD);
 
diff --git a/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Device.java b/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Device.java
index 7ee64e9..de97c19 100644
--- a/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Device.java
+++ b/simulator-http/src/main/java/de/dentrassi/hono/simulator/http/Device.java
@@ -135,6 +135,7 @@ protected void handleSuccess(final Instant start) {
     }
 
     protected void handleException(final Throwable e) {
+        logger.debug("Failed to tick device", e);
         this.statistics.failed();
         this.statistics.error(0);
     }