it begindth

.gitignore

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+.eunit
+deps
+*.o
+*.beam
+*.plt
+*.swp
+*.swo
+erl_crash.dump
+ebin/*.beam
+doc/*.html
+doc/*.css
+doc/edoc-info
+doc/erlang.png
+rel/example_project
+.concrete/DEV_MODE
+.rebar

README.md

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+# rubicon mega-repo and playground
+
+## rubicon by example
+
+- x00-hello:
+  - purpose: hello world with noise
+  - client connects to server
+  - server writes back "hello"
+  - server closes connection

ct/rubicon.aes

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+/**
+ * Rubicon contracts
+ *
+ * Copyright (C) 2026, QPQ AG
+ *
+ * Author: Peter Harpending <peterharpending@qpq.swiss>
+ * Date: 2026-08-12
+ */
+
+payable contract NameService =
+    record state =
+        {names : map(string, address)}
+
+    payable entrypoint
+        init : () => state
+        init() =
+            

x00-hello/hello_client.erl

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+-module(hello_client).
+
+-export([main/0]).
+
+main() ->
+    {ok, Socket} = gen_tcp:connect("localhost", 6969, [binary, {packet, 0}]),
+    loop(Socket).
+
+loop(Socket) ->
+    ok = inet:setopts(Socket, [{active, once}]),
+    receive
+        {tcp, Socket, Bytes} ->
+            ok = io:format("< ~tp~n", [Bytes]),
+            loop(Socket);
+        {tcp_closed, Socket} ->
+            ok = io:format("connection terminated~n", []),
+            exit(normal)
+    end.

x00-hello/hello_server.erl

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+-module(hello_server).
+
+-export([main/0]).
+
+main() ->
+    {ok, ListenSocket} = gen_tcp:listen(6969, [binary, {packet, 0}, {active, false}]),
+    %% blocks until client connects
+    {ok, Socket} = gen_tcp:accept(ListenSocket),
+    Msg = <<"hello, world">>,
+    ok = io:format("> ~tp~n", [Msg]),
+    ok = gen_tcp:send(Socket, Msg),
+    ok = gen_tcp:close(Socket),
+    ok = gen_tcp:close(ListenSocket),
+    ok.