%% -*- mode: erlang -*-
%%
%% sys.config for the BACK node (foreign server).
%%
%% The back node runs DC pool connections to Telegram.
%% It does NOT listen for client connections — that is done by the front node(s).
%%
%% Multiple front nodes can share one back node.
%% Start the back node first so pools are ready when fronts connect.
%%
[
 {mtproto_proxy,
  [
   %% This node is a back-end only.
   {node_role, back},

   %% No `ports' section — the back node does not accept client connections.

   %% Telegram proxy secret (fetched from core.telegram.org).
   %% Defaults are fine; override only if you need a custom URL.
   %% {proxy_secret_url, "https://core.telegram.org/getProxySecret"},
   %% {proxy_config_url, "https://core.telegram.org/getProxyConfig"},

   %% The back node must know its external IP for Telegram's encryption.
   %% Either set it explicitly or let ip_lookup_services resolve it.
   %% {external_ip, "YOUR.BACK.NODE.EXTERNAL.IP"},
   {ip_lookup_services,
    ["http://ipv4.seriyps.com/",
     "http://v4.ident.me/",
     "http://ipv4.icanhazip.com/",
     "https://digitalresistance.dog/myIp"]},

   %% Multiplexing tuning (back node creates DC connections).
   %% {init_dc_connections, 2},
   %% {clients_per_dc_connection, 300}
  ]},

 {kernel,
  [{logger_level, info},
   {logger,
    [{handler, default, logger_std_h,
      #{level  => info,
        config => #{type            => file,
                    file            => "/var/log/mtproto-proxy/back.log",
                    max_no_bytes    => 104857600,
                    max_no_files    => 10,
                    filesync_repeat_interval => no_repeat}}},
     {handler, console, logger_std_h,
      #{level  => critical,
        config => #{type => standard_io}}}
    ]}]},
 {sasl,
  [{errlog_type, error}]}
].