Add mqtt server (mosquitto)

The config was based on the exsisting mosquitto setup.

config/hosts/mqtt/configuration.nix

@@ -0,0 +1,10 @@
+{ ... }:
+
+{
+	networking = {
+        hostName = "mqtt";
+        domain = "z9.ccchh.net";
+	};
+
+	system.stateVersion = "23.11";
+}

config/hosts/mqtt/default.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+{
+	imports = [
+		./configuration.nix
+		./networking.nix
+		./mosquitto.nix
+	];
+}

config/hosts/mqtt/mosquitto.nix

@@ -0,0 +1,33 @@
+# Sources for this configuration:
+# - https://search.nixos.org/options?sort=relevance&type=packages&query=services.mosquitto
+# - https://mosquitto.org/man/mosquitto-conf-5.html
+# - https://winkekatze24.de
+{ ... }:
+
+{
+    services.mosquitto = {
+        enable = true;
+        persistence = true;
+
+        # set config for all listeners
+        listeners = [ {
+            settings.allow_anonymous = true;
+            omitPasswordAuth = true;
+            acl = ["topic readwrite #"];
+        } ];
+
+        bridges.winkekatz = {
+            addresses = [
+                { address = "mqtt.winkekatze24.de"; }
+            ];
+            topics = [
+                "winkekatze/allcats/eye/set in 2"
+                "winkekatze/allcats in 2"
+                "+/status out 2 winkekatze/ \"\""
+                "+/connected out 2 winkekatze/ \"\""
+            ];
+        };
+    };
+
+    networking.firewall.allowedTCPPorts = [ 1883 ];
+}

config/hosts/mqtt/networking.nix

@@ -0,0 +1,20 @@
+{ ... }:
+
+{
+    networking = {
+        interfaces.net0 = {
+            ipv4.addresses = [ {
+                address = "10.31.208.14";
+                prefixLength = 23;
+            } ];
+        };
+        defaultGateway = "10.31.208.1";
+        nameservers = [
+            "10.31.210.1"
+        ];
+    };
+    systemd.network.links."10-net0" = {
+        matchConfig.MACAddress = "BC:24:11:48:85:73";
+        linkConfig.Name = "net0";
+    };
+}