add mqtt host

hosts/mqtt/mosquitto.nix

@@ -0,0 +1,36 @@
+{ ... }:
+
+{
+  services.mosquitto = {
+    enable = true;
+    listeners = [
+      {
+        port = 1883;
+        settings = {
+          ptotocol = "mqtt";
+        };
+      }
+      {
+        port = 8083;
+        settings = {
+          protocol = "websockets";
+        };
+      }
+    ];
+    settings = {
+      allow_zero_length_clientid = true;
+      autosave_interval = 1800;
+      autosave_on_changes = true;
+      connection_messages = true;
+      allow_anonymous = true;
+    };
+    logDest = "stdout";
+    logType = [
+      "error"
+      "warning"
+      "notice"
+      "information"
+    ];
+  };
+}
+