anchor.diff:          Type = "dbus";
           BusName = "net.connman";
           Restart = "on-failure";
  -        ExecStart = "${pkgs.connman}/sbin/connmand --nodaemon";
  +        ExecStart = "${pkgs.connman}/sbin/connmand --config=${configFile} --nodaemon";
           StandardOutput = "null";
         };
       };
  
positive.code:         default = false;
          description = ''
            Whether to use ConnMan for managing your network connections.
          '';
        };
  
  
negative.code: 
  let
    cfg = config.networking.connman;
    configFile = pkgs.writeText "connman.conf" ''
      [General]
      NetworkInterfaceBlacklist=${concatStringsSep "," cfg.networkInterfaceBlacklist}
  
      ${cfg.extraConfig}
    '';
  in {
  
    ###### interface
  