Added

hosts/rpi4/default.nix

@@ -0,0 +1,56 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [
+    # Include the results of the hardware scan.
+    ./hardware-configuration.nix
+    ./fan-controll.nix
+  ];
+
+  boot.loader = {
+    grub.enable = false;
+    generic-extlinux-compatible.enable = true;
+  };
+
+  networking.hostName = "nix-rpi4-1"; # Define your hostname.
+
+  networking = {
+    networkmanager.enable = false;
+    useNetworkd = true;
+    useDHCP = false;
+
+    interfaces.end0 = {
+      defaultGateway = {
+        address = "192.168.2.1";
+        interface = "end0";
+      };
+
+      nameservers = [
+        "192.168.2.2"
+        "1.1.1.1"
+        "8.8.8.8"
+      ];
+    };
+
+    wireless = {
+      enable = true;
+      userControlled.enable = false;
+      networks = {
+        "LANFRED".psk = "CooleJungsWG";
+      };
+    };
+  };
+
+  # Set your time zone.
+  time.timeZone = "Europe/Berlin";
+
+  networking.firewall.enable = false;
+
+  system.stateVersion = "25.11"; # Did you read the comment?
+
+}