Changes:

* Program to benchmark the high level client.
* First steps with sentinel support in the high level client.

tools/echo_server_client.cpp

@@ -0,0 +1,51 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+
+namespace net = boost::asio;
+
+using net::ip::tcp;
+using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
+using timer_type = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
+
+net::awaitable<void> example(std::string msg, int n)
+{
+   try {
+      auto ex = co_await net::this_coro::executor;
+
+      tcp::resolver resv{ex};
+      auto const res = resv.resolve("127.0.0.1", "55555");
+      tcp_socket socket{ex};
+      co_await socket.async_connect(*std::begin(res));
+
+      std::string buffer;
+      auto dbuffer = net::dynamic_buffer(buffer);
+      for (int i = 0; i < n; ++i) {
+         co_await net::async_write(socket, net::buffer(msg));
+         co_await net::async_read_until(socket, dbuffer, "\n");
+         //std::printf("Nada %s", buffer.data());
+      }
+   } catch (...) {
+      std::cerr << "Error" << std::endl;
+   }
+}
+
+int main()
+{
+   try {
+      net::io_context ioc;
+
+      int n = 100;
+      for (int i = 0; i < 500; ++i)
+         net::co_spawn(ioc, example("Some message\n", n), net::detached);
+
+      ioc.run();
+   } catch (std::exception const& e) {
+      std::cerr << e.what() << std::endl;
+   }
+}