diff --git a/instances/heimdall/configuration.nix b/instances/heimdall/configuration.nix
index 4992678..4d8f747 100644
--- a/instances/heimdall/configuration.nix
+++ b/instances/heimdall/configuration.nix
@@ -87,6 +87,7 @@ in
         port = 1883;
         users.iotdevice = {
           acl = [
+            "pattern readwrite #"
             "read IoT/device/action"
             "write IoT/device/observations"
             "write IoT/device/LW"
@@ -100,9 +101,9 @@ in
       settings = {
         homeassistant = config.services.home-assistant.enable;
         permit_join = true;
-        serial = {
-          port = "/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0";
-        };
+        # serial = {
+        #   port = "/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0";
+        # };
       };
     };
     grafana = {