Emitter: E-mail on backup failure

Allows for IPv6, since DHCPv6 is not available at its location.

hosts/Emitter.nix

@@ -10,8 +10,60 @@
 
     networking.hostName = "Emitter";
 
+    networking.tempAddresses = "disabled";
     networking.useDHCP = false;
-    networking.interfaces.ens3.useDHCP = true;
+    networking = {
+        defaultGateway = {
+            address = "2.59.133.1";
+            interface = "ens3";
+        };
+        defaultGateway6 = {
+            address = "2a0d:5940:7::1";
+            interface = "ens3";
+        };
+        nameservers = [
+            "9.9.9.10"
+            "8.8.8.8"
+            "2606:4700:4700::1111"
+            "2001:4860:4860::8888"
+        ];
+        interfaces.ens3 = {
+            ipv4 = {
+                addresses = [
+                    {
+                        address = "2.59.133.12";
+                        prefixLength = 24;
+                    }
+                ];
+                routes = [
+                    {
+                        address = "2.59.133.0";
+                        prefixLength = 24;
+                        via = "2.59.133.1";
+                    }
+                ];
+            };
+            ipv6 = {
+                addresses = [
+                    {
+                        address = "2a0d:5940:7:16f:216:3cff:fe63:9a54";
+                        prefixLength = 64;
+                    }
+                    {
+                        address = "fe80::216:3cff:fe63:9a54";
+                        prefixLength = 64;
+                    }
+                ];
+                routes = [
+                    {
+                        address = "2a0d:5940:7:16f:216:3cff:fe63:9a54";
+                        prefixLength = 64;
+                        via = "2a0d:5940:7::1";
+                    }
+                ];
+            };
+        };
+    };
 
     i18n.defaultLocale = "de_DE.UTF-8";
     console.keyMap = "de";
@@ -64,6 +116,8 @@
             sslKeyPasswordFile = "/secrets/burp_ssl_key_password";
         };
     };
+    services.statusEmail.enable = true;
+    systemd.services.burp-client.unitConfig.OnFailure = "status-email@%n.service";
 
     # This value determines the NixOS release from which the default
     # settings for stateful data, like file locations and database versions