Add mqtt server config to pi

hosts/pi/default.nix

@@ -53,12 +53,25 @@
     systemWide = true;
   };
 
+  services.mosquitto = {
+    enable = true;
+    listeners = [{
+      port = 1883;
+    }];
+  };
+
   services.zigbee2mqtt = {
     enable = true;
     settings = {
-      homeassistant = true;
+      homeassistant = config.services.home-assistant.enable;
       frontend = true;
       permit_join = true;
+      serial = {
+        port = "/dev/ttyUSB0";
+      };
+      mqtt = {
+        server = "mqtt://localhost:1883";
+      };
     };
   };