add example with real hardware

examples/hello-from-mt300.nix

@@ -0,0 +1,43 @@
+{ config, pkgs, lib, ... } :
+let
+  inherit (pkgs) serviceFns;
+  svc = config.system.service;
+
+in rec {
+  imports = [
+    ../modules/network
+    ../modules/ssh
+    ../modules/vlan
+    ../modules/flashimage.nix
+  ];
+
+  boot.tftp = {
+    # IP addresses to use in the boot monitor when flashing/ booting
+    # over TFTP. If you are flashing using the stock firmware's Web UI
+    # then these dummy values are fine
+    ipaddr = "192.0.2.115"; # my address
+    serverip = "192.0.2.5"; # build machine or other tftp server
+  };
+
+  hostname = "hello";
+
+  services.dhcpc = svc.network.dhcp.client.build {
+    interface = config.hardware.networkInterfaces.lan;
+
+    # don't start DHCP until the hostname is configured,
+    # so it can identify itself to the DHCP server
+    dependencies = [ config.services.hostname ];
+  };
+
+  services.sshd = svc.ssh.build { };
+
+  users.root = {
+    # the password is "secret". Use mkpasswd -m sha512crypt to
+    # create this hashed password string
+    passwd = "$6$y7WZ5hM6l5nriLmo$5AJlmzQZ6WA.7uBC7S8L4o19ESR28Dg25v64/vDvvCN01Ms9QoHeGByj8lGlJ4/b.dbwR9Hq2KXurSnLigt1W1";
+  };
+
+  defaultProfile.packages = with pkgs; [
+    figlet
+  ];
+}