kopia lustrzana https://github.com/espressif/esp-idf
89 wiersze
2.1 KiB
C++
89 wiersze
2.1 KiB
C++
//
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// async_udp_echo_server.cpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <cstdlib>
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#include <iostream>
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#include "asio.hpp"
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#include "protocol_examples_common.h"
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#include "esp_event.h"
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#include "nvs_flash.h"
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using asio::ip::udp;
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class server
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{
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public:
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server(asio::io_context& io_context, short port)
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: socket_(io_context, udp::endpoint(udp::v4(), port))
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{
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do_receive();
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}
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void do_receive()
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{
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socket_.async_receive_from(
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asio::buffer(data_, max_length), sender_endpoint_,
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[this](std::error_code ec, std::size_t bytes_recvd)
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{
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if (!ec && bytes_recvd > 0)
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{
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data_[bytes_recvd] = 0;
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std::cout << data_ << std::endl;
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do_send(bytes_recvd);
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}
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else
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{
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do_receive();
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}
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});
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}
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void do_send(std::size_t length)
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{
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socket_.async_send_to(
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asio::buffer(data_, length), sender_endpoint_,
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[this](std::error_code /*ec*/, std::size_t bytes /*bytes_sent*/)
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{
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do_receive();
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});
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}
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private:
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udp::socket socket_;
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udp::endpoint sender_endpoint_;
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enum { max_length = 1024 };
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char data_[max_length];
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};
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extern "C" void app_main(void)
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{
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ESP_ERROR_CHECK(nvs_flash_init());
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esp_netif_init();
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
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* Read "Establishing Wi-Fi or Ethernet Connection" section in
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* examples/protocols/README.md for more information about this function.
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*/
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ESP_ERROR_CHECK(example_connect());
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/* This helper function configures blocking UART I/O */
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ESP_ERROR_CHECK(example_configure_stdin_stdout());
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asio::io_context io_context;
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server s(io_context, std::atoi(CONFIG_EXAMPLE_PORT));
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io_context.run();
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}
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