defiant: add rtl-tcp

hosts/defiant/configuration.nix

@@ -25,6 +25,7 @@
       ./services/microbin.nix
       # ./services/minecraft.nix
       ./services/monitoring
+      ./services/rtl-tcp.nix
       ./services/vaultwarden.nix
   ];
 

hosts/defiant/services/rtl-tcp.nix

@@ -0,0 +1,14 @@
+{ config, pkgs, lib, ... }:
+
+let
+  port = 1457;
+in {
+  hardware.rtl-sdr.enable = true;
+  systemd.services.rtl-tcp = {
+    script = "${pkgs.rtl-sdr}/bin/rtl_tcp -a 0.0.0.0 -p ${toString port} -s 2000000 -T";
+    serviceConfig = {
+      Group = "plugdev";
+    };
+  };
+  networking.firewall.allowedTCPPorts = [ port ];
+}