asio: initial idf port of asio library without ssl

* Original commit: espressif/esp-idf@1ef13c524c

examples/protocols/asio/udp_echo_server/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+PROJECT_NAME := asio_udp_echoserver
+
+include $(IDF_PATH)/make/project.mk

examples/protocols/asio/udp_echo_server/README.md

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+# ASIO udp echo server example
+
+Simple asio echo server using WiFi STA
+
+## Example workflow
+
+- WiFi STA is started and trying to connect to the access point defined through `make menuconfig`
+- Once connected and acquired IP address, ASIO udp server is started on port number defined through `make menuconfig`
+- Server receives and echoes back messages transmitted from client
+
+## Running the example
+
+- Run `make menuconfig` to configure the access point's SSID and Password and port number
+- Run `make flash monitor` to build and upload the example to your board and connect to it's serial terminal
+- Wait for WiFi to connect to your access point (note the IP address)
+- You can now send a udp message and check it is repeated, for example using netcat `nc -u IP PORT`
+
+See the README.md file in the upper level 'examples' directory for more information about examples.

examples/protocols/asio/udp_echo_server/asio_udp_server_test.py

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+import re
+import os
+import sys
+from socket import *
+
+
+# this is a test case write with tiny-test-fw.
+# to run test cases outside tiny-test-fw,
+# we need to set environment variable `TEST_FW_PATH`,
+# then get and insert `TEST_FW_PATH` to sys path before import FW module
+test_fw_path = os.getenv("TEST_FW_PATH")
+if test_fw_path and test_fw_path not in sys.path:
+    sys.path.insert(0, test_fw_path)
+
+import TinyFW
+import IDF
+
+
+
+
+@IDF.idf_example_test(env_tag="Example_WIFI")
+def test_examples_protocol_asio_udp_server(env, extra_data):
+    """
+    steps: |
+      1. join AP
+      2. Start server
+      3. Test connects to server and sends a test message
+      4. Test evaluates received test message from server
+      5. Test evaluates received test message on server stdout
+    """
+    test_msg="echo message from client to server"
+    dut1 = env.get_dut("udp_echo_server", "examples/protocols/asio/udp_echo_server")
+    # check and log bin size
+    binary_file = os.path.join(dut1.app.binary_path, "asio_udp_echoserver.bin")
+    bin_size = os.path.getsize(binary_file)
+    IDF.log_performance("asio_udp_echoserver_bin_size", "{}KB".format(bin_size//1024))
+    IDF.check_performance("asio_udp_echoserver_size", bin_size//1024)
+    # 1. start test
+    dut1.start_app()
+    # 2. get the server IP address
+    data = dut1.expect(re.compile(r" sta ip: ([^,]+),"))
+    # 3. create tcp client and connect to server
+    cli = socket(AF_INET, SOCK_DGRAM)
+    cli.connect((data[0], 80))
+    cli.send(test_msg)
+    data = cli.recv(1024)
+    # 4. check the message received back from the server
+    if (data == test_msg):
+        print("PASS: Received correct message")
+        pass
+    else:
+        print("Failure!")
+        raise ValueError('Wrong data received from asi udp server: {} (expoected:{})'.format(data, test_msg))
+    # 5. check the client message appears also on server terminal
+    dut1.expect(test_msg)
+
+if __name__ == '__main__':
+    test_examples_protocol_asio_udp_server()

examples/protocols/asio/udp_echo_server/components/component.mk

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+#
+# Component Makefile
+#
+# This Makefile should, at the very least, just include $(SDK_PATH)/Makefile. By default, 
+# this will take the sources in the src/ directory, compile them and link them into 
+# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
+# please read the SDK documents if you need to do this.
+#
+
+COMPONENT_SRCDIRS = .

examples/protocols/asio/udp_echo_server/components/wifi_asio.cpp

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+/* Common WiFi Init as STA for ASIO examples
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+#include "esp_system.h"
+#include "esp_wifi.h"
+#include "esp_event_loop.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+#include "driver/uart.h"
+#include "esp_console.h"
+#include "esp_vfs_dev.h"
+
+#include "lwip/err.h"
+#include "lwip/sys.h"
+
+#include <cstring>
+
+/* The examples use simple WiFi configuration that you can set via
+   'make menuconfig'.
+
+   If you'd rather not, just change the below entries to strings with
+   the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
+*/
+#define EXAMPLE_ESP_WIFI_SSID      CONFIG_ESP_WIFI_SSID
+#define EXAMPLE_ESP_WIFI_PASS      CONFIG_ESP_WIFI_PASSWORD
+
+/* FreeRTOS event group to signal when we are connected*/
+static EventGroupHandle_t wifi_event_group;
+
+/* The event group allows multiple bits for each event,
+   but we only care about one event - are we connected
+   to the AP with an IP? */
+const int WIFI_CONNECTED_BIT = BIT0;
+
+static const char *TAG = "asio example wifi init";
+
+/**
+ *  Definition of ASIO main method, which is called after network initialized
+ */
+void asio_main();
+
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    switch(event->event_id) {
+    case SYSTEM_EVENT_STA_START:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_GOT_IP:
+        ESP_LOGI(TAG, "got ip:%s",
+                 ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
+        xEventGroupSetBits(wifi_event_group, WIFI_CONNECTED_BIT);
+        break;
+    case SYSTEM_EVENT_AP_STACONNECTED:
+        ESP_LOGI(TAG, "station:" MACSTR " join, AID=%d",
+                 MAC2STR(event->event_info.sta_connected.mac),
+                 event->event_info.sta_connected.aid);
+        break;
+    case SYSTEM_EVENT_AP_STADISCONNECTED:
+        ESP_LOGI(TAG, "station:" MACSTR "leave, AID=%d",
+                 MAC2STR(event->event_info.sta_disconnected.mac),
+                 event->event_info.sta_disconnected.aid);
+        break;
+    case SYSTEM_EVENT_STA_DISCONNECTED:
+        esp_wifi_connect();
+        xEventGroupClearBits(wifi_event_group, WIFI_CONNECTED_BIT);
+        break;
+    default:
+        break;
+    }
+    return ESP_OK;
+}
+
+void wifi_init_sta()
+{
+    wifi_event_group = xEventGroupCreate();
+
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    wifi_config_t wifi_config;
+    // zero out the config struct to ensure defaults are setup
+    memset(&wifi_config, 0, sizeof(wifi_sta_config_t));
+    // only copy ssid&password from example config
+    strcpy((char*)(wifi_config.sta.ssid), EXAMPLE_ESP_WIFI_SSID);
+    strcpy((char*)(wifi_config.sta.password), EXAMPLE_ESP_WIFI_PASS);
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+    ESP_LOGI(TAG, "connect to ap SSID:%s password:%s",
+             EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
+}
+
+extern "C" void app_main()
+{
+    //Initialize NVS
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES) {
+      ESP_ERROR_CHECK(nvs_flash_erase());
+      ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_AP");
+    wifi_init_sta();
+
+    // Initialize VFS & UART so we can use std::cout/cin
+    setvbuf(stdin, NULL, _IONBF, 0);
+    setvbuf(stdout, NULL, _IONBF, 0);
+    /* Install UART driver for interrupt-driven reads and writes */
+    ESP_ERROR_CHECK( uart_driver_install( (uart_port_t)CONFIG_CONSOLE_UART_NUM,
+            256, 0, 0, NULL, 0) );
+    /* Tell VFS to use UART driver */
+    esp_vfs_dev_uart_use_driver(CONFIG_CONSOLE_UART_NUM);
+    esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);
+    /* Move the caret to the beginning of the next line on '\n' */
+    esp_vfs_dev_uart_set_tx_line_endings(ESP_LINE_ENDINGS_CRLF);
+
+    // wait till we receive IP, so asio realated code can be started
+    xEventGroupWaitBits(wifi_event_group, WIFI_CONNECTED_BIT, 1, 1, portMAX_DELAY);
+
+    // network is ready, let's proceed with ASIO example
+    asio_main();
+}

examples/protocols/asio/udp_echo_server/main/Kconfig.projbuild

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+menu "Example Configuration"
+
+config ESP_WIFI_SSID
+    string "WiFi SSID"
+    default "myssid"
+    help
+	SSID (network name) for the example to connect to.
+
+config ESP_WIFI_PASSWORD
+    string "WiFi Password"
+    default "mypassword"
+    help
+	WiFi password (WPA or WPA2) for the example to use.
+
+config EXAMPLE_PORT
+    string "asio example port number"
+    default "80"
+    help
+    Port number used by ASIO example
+
+endmenu

examples/protocols/asio/udp_echo_server/main/component.mk

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+#
+# Main component makefile.
+#
+# This Makefile can be left empty. By default, it will take the sources in the 
+# src/ directory, compile them and link them into lib(subdirectory_name).a 
+# in the build directory. This behaviour is entirely configurable,
+# please read the ESP-IDF documents if you need to do this.
+#

examples/protocols/asio/udp_echo_server/main/udp_echo_server.cpp

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+//
+// async_udp_echo_server.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <cstdlib>
+#include <iostream>
+
+#include "asio.hpp"
+
+using asio::ip::udp;
+
+class server
+{
+public:
+  server(asio::io_context& io_context, short port)
+    : socket_(io_context, udp::endpoint(udp::v4(), port))
+  {
+    do_receive();
+  }
+
+  void do_receive()
+  {
+    socket_.async_receive_from(
+        asio::buffer(data_, max_length), sender_endpoint_,
+        [this](std::error_code ec, std::size_t bytes_recvd)
+        {
+          if (!ec && bytes_recvd > 0)
+          {
+            std::cout << data_ << std::endl;
+            do_send(bytes_recvd);
+          }
+          else
+          {
+            do_receive();
+          }
+        });
+  }
+
+  void do_send(std::size_t length)
+  {
+    socket_.async_send_to(
+        asio::buffer(data_, length), sender_endpoint_,
+        [this](std::error_code /*ec*/, std::size_t  bytes /*bytes_sent*/)
+        {
+          do_receive();
+        });
+  }
+
+private:
+  udp::socket socket_;
+  udp::endpoint sender_endpoint_;
+  enum { max_length = 1024 };
+  char data_[max_length];
+};
+
+void asio_main()
+{
+    asio::io_context io_context;
+
+    server s(io_context, std::atoi(CONFIG_EXAMPLE_PORT));
+
+    io_context.run();
+}

examples/protocols/asio/udp_echo_server/sdkconfig.defaults

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+CONFIG_MAIN_TASK_STACK_SIZE=8192