flake.nix.example

{
  description = "Example Raspberry Pi GNSS/GPS time server using stratum";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    stratum.url = "github:koenw/stratum";
  };

  outputs = { self, nixpkgs, stratum }@inputs: {
    nixosConfigurations."stratum" = nixpkgs.lib.nixosSystem {
      system = "aarch64-linux";
      modules = [
        # Uncomment to be able to build an SD image using
        # `nix build '.#nixosConfigurations."stratum".config.system.build.sdImage'`
        # stratum.nixosModules.sdImage
        stratum.nixosModules.stratum
        ({config, pkgs, lib, ...}:
        {
          networking.hostName = "stratum";

          # Don't forget to create a user for yourself before re-configuring,
          # or you might lock yourself out!
          # users.groups.stratum = {};
          # users.users.stratum = {
          #   isNormalUser = true;
          #   extraGroups = [ "wheel" ];
          #   group = "stratum";
          #   openssh.authorizedKeys.keys = [
          #     "ssh-ed25519 AAAAXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX stratum@purple"
          #   ];
          #   initialHashedPassword = "";
          # };

          # Set if you want to use ACME/Let's Encrypt for NTS certificates
          # security.acme.acceptTerms = true;
          # security.acme.defaults.email = "hello@example.com";

          stratum = {
            enable = true;
            ntp.allowedIPv6Ranges = [
              { address = "fe80::"; prefixLength = 10; }
              { address = "2a02:a469:1070:babe::"; prefixLength = 64; }
            ];

            # Using ACME by default, see above to accept terms and set your email
            # ntp.nts.enable = true;
            # or bring your own certificates
            # ntp.nts.certificate = "/etc/bladiebla";
            # ntp.nts.key = "/etc/bladiebla";

            gps.serial.offset = "0.119";
            i2c-rtc.enable = true;
          };
        })
      ];
    };
  };
}