meshtasticd: build from source, nixos/meshtastic: init

nixos/doc/manual/release-notes/rl-2605.section.md

@@ -10,6 +10,10 @@
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
+- [Meshtastic](https://meshtastic.org), an open-source, off-grid, decentralised mesh network
+  designed to run on affordable, low-power devices. Available as [services.meshtasticd]
+  (#opt-services.meshtasticd.enable).
+
 - [knot-resolver](https://www.knot-resolver.cz/) in version 6. Available as `services.knot-resolver`. A module for knot-resolver 5 was already available as `services.kresd`.
 
 - [udp-over-tcp](https://github.com/mullvad/udp-over-tcp), a tunnel for proxying UDP traffic over a TCP stream. Available as `services.udp-over-tcp`.
@@ -24,4 +28,4 @@
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
-- `services.openssh` now supports generating host SSH keys by setting `services.openssh.generateHostKeys = true` while leaving `services.openssh.enable` disabled.  This is particularly useful for systems that have no need of an SSH daemon but want SSH host keys for other purposes such as using agenix or sops-nix.
+- `services.openssh` now supports generating host SSH keys by setting `services.openssh.generateHostKeys = true` while leaving `services.openssh.enable` disabled. This is particularly useful for systems that have no need of an SSH daemon but want SSH host keys for other purposes such as using agenix or sops-nix.

nixos/modules/module-list.nix

@@ -1247,6 +1247,7 @@
   ./services/networking/lxd-image-server.nix
   ./services/networking/magic-wormhole-mailbox-server.nix
   ./services/networking/matterbridge.nix
+  ./services/networking/meshtasticd.nix
   ./services/networking/microsocks.nix
   ./services/networking/mihomo.nix
   ./services/networking/minidlna.nix

nixos/modules/services/networking/meshtastic.md

@@ -0,0 +1,57 @@
+# Meshtasticd {#module-services-meshtasticd}
+
+[Meshtasticd](https://meshtastic.org/) daemon.
+
+Meshtastic is an open-source, off-grid, decentralised mesh network designed to
+run on affordable, low-power devices.
+
+Meshtastic is a project that enables you to use inexpensive LoRa radios as a
+long range off-grid communication platform in areas without existing or reliable
+communications infrastructure. This project is 100% community driven and open
+source!
+
+## Quickstart {#module-services-meshtasticd-quickstart}
+
+A minimal configuration:
+
+```nix
+{
+  services.meshtasticd = {
+    enable = true;
+    port = 4403;
+    settings = {
+      Lora = {
+        Module = "auto";
+      };
+      Webserver = {
+        Port = 9443;
+        RootPath = pkgs.meshtastic-web;
+      };
+      General = {
+        MaxNodes = 200;
+        MaxMessageQueue = 100;
+        MACAddressSource = "eth0";
+      };
+    };
+  };
+}
+```
+
+By default Meshtasticd listens on all network interfaces. The example above
+binds the daemon to port `4403` and the web UI to `9443`. This module
+intentionally does not configure an reverse proxy for you, keeping the module
+focused on the Meshtastic service itself. If you need to restrict access, use
+firewall rules or put the web UI behind a reverse proxy (e.g.: Caddy, Nginx)
+that binds to `127.0.0.1` and exposes only the proxy. This approach leaves proxy
+choice and TLS configuration to the operator while documenting how to securely
+expose the web UI when required.
+
+## Configuration {#module-services-meshtasticd-config}
+
+All available configuration directives are documented in the
+[standard Meshtastic configuration file](https://github.com/meshtastic/firmware/blob/develop/bin/config-dist.yaml).
+
+The service uses a dedicated user and group account (`meshtasticd`) by default.
+If you override the service user, ensure it is a member of the `spi` and `gpio`
+groups so it can access the required hardware devices, as mandated by
+Meshtastic’s default `udev` rules.

nixos/modules/services/networking/meshtasticd.nix

@@ -0,0 +1,124 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.services.meshtasticd;
+  format = pkgs.formats.yaml { };
+  configFile = format.generate "config.yaml" cfg.settings;
+in
+{
+  options.services.meshtasticd = {
+    enable = lib.mkEnableOption "Meshtastic daemon";
+    package = lib.mkPackageOption pkgs "meshtasticd" { };
+
+    user = lib.mkOption {
+      default = "meshtasticd";
+      description = "User meshtasticd runs as.";
+      type = lib.types.str;
+    };
+
+    group = lib.mkOption {
+      default = "meshtasticd";
+      description = "Group meshtasticd runs as.";
+      type = lib.types.str;
+    };
+
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 4403;
+      description = "Port to listen on";
+    };
+
+    settings = lib.mkOption {
+      type = format.type;
+      example = lib.literalExpression ''
+        Lora = {
+          Module = "auto";
+        };
+        Webserver = {
+          Port = 9443;
+          RootPath = pkgs.meshtastic-web;
+        };
+        General = {
+          MaxNodes = 200;
+          MaxMessageQueue = 100;
+          MACAddressSource = "eth0";
+        };
+      '';
+      description = ''
+        The Meshtastic configuration file.
+
+        An example of configuration can be found at <https://github.com/meshtastic/firmware/blob/develop/bin/config-dist.yaml>
+      '';
+    };
+
+    dataDir = lib.mkOption {
+      default = "/var/lib/meshtasticd";
+      type = lib.types.path;
+      description = ''
+        The data directory.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # Creation of the `meshtasticd` privilege user.
+    users = {
+      users = lib.mkIf (cfg.user == "meshtasticd") {
+        meshtasticd = {
+          home = cfg.dataDir;
+          description = "meshtasticd-daemon privilege user";
+          group = cfg.group;
+          isSystemUser = true;
+          extraGroups = [
+            "spi"
+            "gpio"
+          ];
+        };
+      };
+      groups = lib.mkIf (cfg.group == "meshtasticd") {
+        meshtasticd = { };
+        # These groups are required for udev rules to work properly.
+        spi = { };
+        gpio = { };
+      };
+    };
+
+    # The `meshtasticd` package provides udev rules.
+    services.udev.packages = [
+      cfg.package
+    ];
+
+    # Creation of the `meshtasticd` service.
+    # Based on the official meshtasticd service file: https://github.com/meshtastic/firmware/blob/develop/bin/meshtasticd.service
+    systemd.services.meshtasticd = {
+      description = "Meshtastic Native Daemon";
+      after = [
+        "network-online.target"
+        "network.target"
+      ];
+      wants = [
+        "network-online.target"
+        "network.target"
+      ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        User = cfg.user;
+        Group = cfg.group;
+        Type = "simple";
+        StateDirectory = "meshtasticd";
+        AmbientCapabilities = [
+          "CAP_NET_BIND_SERVICE"
+        ];
+        ExecStart = "${lib.getExe cfg.package} --port=${builtins.toString cfg.port} --fsdir=${cfg.dataDir} --config=${configFile} --verbose";
+        Restart = "always";
+        RestartSec = "3";
+      };
+    };
+  };
+}

nixos/tests/all-tests.nix

@@ -938,6 +938,7 @@ in
   meilisearch = runTest ./meilisearch.nix;
   memcached = runTest ./memcached.nix;
   merecat = runTest ./merecat.nix;
+  meshtasticd = runTest ./networking/meshtasticd.nix;
   metabase = runTest ./metabase.nix;
   mihomo = runTest ./mihomo.nix;
   mimir = runTest ./mimir.nix;

nixos/tests/networking/meshtasticd.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  pkgs,
+  ...
+}:
+let
+  mainPort = 9445;
+  webPort = 9446;
+in
+{
+  name = "meshtasticd";
+  meta.maintainers = [ lib.maintainers.drupol ];
+
+  nodes.machine = {
+    services.meshtasticd = {
+      enable = true;
+      port = mainPort;
+
+      settings = {
+        Lora = {
+          Module = "sim";
+          DIO2_AS_RF_SWITCH = false;
+          spiSpeed = "2000000";
+        };
+        Webserver = {
+          Port = webPort;
+          RootPath = pkgs.meshtastic-web;
+        };
+        General = {
+          MaxNodes = 200;
+          MaxMessageQueue = 100;
+          MACAddressSource = "eth0";
+        };
+      };
+    };
+  };
+
+  testScript = ''
+    with subtest("Test meshtasticd service"):
+      machine.wait_for_unit("meshtasticd.service")
+      machine.wait_for_open_port(${builtins.toString mainPort})
+      machine.wait_for_open_port(${builtins.toString webPort})
+      machine.succeed("curl -fvvv -Ls http://localhost:${builtins.toString webPort} | grep -q 'Meshtastic Web Client'")
+  '';
+}