start set up for multi-location nixos flake

nixos/hosts/olympus/mosquitto/configuration.nix

@@ -0,0 +1,59 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+let mosquittoPort = 1883;
+in
+{
+  imports = [ ];
+
+  networking.hostName = "mosquitto";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "21.05"; # Did you read the comment?
+
+  # Additional packages
+  environment.systemPackages = with pkgs; [ ];
+
+  services.mosquitto = {
+    enable = true;
+    listeners = [{
+      port = mosquittoPort;
+      settings.allow_anonymous = true;
+      acl = [ "topic readwrite #" ];
+      users = {
+        victor = { acl = [ "readwrite #" ]; };
+        zigbee2mqtt = { acl = [ "readwrite #" ]; };
+      };
+    }];
+
+  };
+
+  services.zigbee2mqtt = {
+    enable = true;
+    dataDir = "/var/lib/zigbee2mqtt";
+    settings = {
+      homeassistant = true;
+      permit_join = false;
+
+      serial = { port = "/dev/ttyUSB0"; };
+
+      mqtt = {
+        base_topic = "zigbee2mqtt";
+        server = "mqtt://localhost:${toString mosquittoPort}";
+        user = "zigbee2mqtt";
+      };
+
+      frontend = { port = 8080; };
+    };
+  };
+
+  networking.firewall.allowedTCPPorts =
+    [ mosquittoPort config.services.zigbee2mqtt.settings.frontend.port ];
+}