diff --git a/flake.lock b/flake.lock
index 614a0ce..9b2d2ec 100644
--- a/flake.lock
+++ b/flake.lock
@@ -9,11 +9,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1655801580,
-        "narHash": "sha256-4XUFDP1ES1KNWwDukQEixCe4uV7Z951kgaVAFhXI2ew=",
+        "lastModified": 1663870497,
+        "narHash": "sha256-gnoyYWvZl64WBqR3tf9bKHAznEtBCHmwx7taHghH9Lw=",
         "owner": "jlesquembre",
         "repo": "clj-nix",
-        "rev": "579141e009200fcd28d251731e9ac5ba46a1ec2a",
+        "rev": "23d9daacc80e634df078c4c6e34d592e1593d84c",
         "type": "github"
       },
       "original": {
@@ -31,11 +31,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1644227066,
-        "narHash": "sha256-FHcFZtpZEWnUh62xlyY3jfXAXHzJNEDLDzLsJxn+ve0=",
+        "lastModified": 1658746384,
+        "narHash": "sha256-CCJcoMOcXyZFrV1ag4XMTpAPjLWb4Anbv+ktXFI1ry0=",
         "owner": "numtide",
         "repo": "devshell",
-        "rev": "7033f64dd9ef8d9d8644c5030c73913351d2b660",
+        "rev": "0ffc7937bb5e8141af03d462b468bd071eb18e1b",
         "type": "github"
       },
       "original": {
@@ -61,11 +61,11 @@
     },
     "flake-utils_2": {
       "locked": {
-        "lastModified": 1644229661,
-        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
         "type": "github"
       },
       "original": {
@@ -76,11 +76,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1656265786,
-        "narHash": "sha256-A9RkoGrxzsmMm0vily18p92Rasb+MbdDMaSnzmywXKw=",
+        "lastModified": 1672580127,
+        "narHash": "sha256-3lW3xZslREhJogoOkjeZtlBtvFMyxHku7I/9IVehhT8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cd90e773eae83ba7733d2377b6cdf84d45558780",
+        "rev": "0874168639713f547c05947c76124f78441ea46c",
         "type": "github"
       },
       "original": {
@@ -98,11 +98,11 @@
     },
     "utils": {
       "locked": {
-        "lastModified": 1656065134,
-        "narHash": "sha256-oc6E6ByIw3oJaIyc67maaFcnjYOz1mMcOtHxbEf9NwQ=",
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "bee6a7250dd1b01844a2de7e02e4df7d8a0a206c",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
         "type": "github"
       },
       "original": {
diff --git a/src/wallfly/core.clj b/src/wallfly/core.clj
index 1134584..e59cb56 100644
--- a/src/wallfly/core.clj
+++ b/src/wallfly/core.clj
@@ -14,14 +14,21 @@
            org.eclipse.paho.client.mqttv3.persist.MemoryPersistence)
   (:gen-class))
 
+(defn- exit! [status msg]
+  (println msg)
+  (System/exit status))
+
 (defn- create-mqtt-client [broker-uri client-id mqtt-username passwd]
   (let [opts (doto (MqttConnectOptions.)
                (.setCleanSession true)
                (.setAutomaticReconnect true)
                (.setPassword (char-array passwd))
                (.setUserName mqtt-username))]
-    (doto (MqttClient. broker-uri client-id (MemoryPersistence.))
-      (.connect opts))))
+    (try
+      (doto (MqttClient. broker-uri client-id (MemoryPersistence.))
+        (.connect opts))
+      (catch Exception e
+        (exit! 1 (.getMessage e))))))
 
 (defn- shell-exec [& args]
   (let [{:keys [exit out err]} (apply shell/sh args)]
@@ -45,7 +52,10 @@
     (.setRetained retained)))
 
 (defn- send-message [client topic msg & {:keys [retained] :or {retained false}}]
-  (.publish client topic (create-message msg retained)))
+  (try
+    (.publish client topic (create-message msg retained))
+    (catch Exception e
+      (exit! 1 (.getMessage e)))))
 
 (defn- create-reporter [client time-to-idle location user host host-device]
   (let [base-topic     (format "homeassistant/binary_sensor/wallfly_%s_%s"
@@ -93,10 +103,6 @@
    ["-t" "--time-to-idle SECONDS" "Number of seconds before considering this host idle."]
    ["-d" "--delay-time SECONDS" "Time to wait before polling for idle time."]])
 
-(defn- exit! [status msg]
-  (println msg)
-  (System/exit status))
-
 (defn- get-key [opts k]
   (if-let [opt (get opts k)]
     [k opt]