diff --git a/components/eppp_link/examples/slave/CMakeLists.txt b/components/eppp_link/examples/slave/CMakeLists.txt new file mode 100644 index 0000000000..144b9e1a21 --- /dev/null +++ b/components/eppp_link/examples/slave/CMakeLists.txt @@ -0,0 +1,6 @@ +# The following five lines of boilerplate have to be in your project's +# CMakeLists in this exact order for cmake to work correctly +cmake_minimum_required(VERSION 3.16) + +include($ENV{IDF_PATH}/tools/cmake/project.cmake) +project(pppos_slave) diff --git a/components/eppp_link/examples/slave/README.md b/components/eppp_link/examples/slave/README.md new file mode 100644 index 0000000000..a8ff85f9f4 --- /dev/null +++ b/components/eppp_link/examples/slave/README.md @@ -0,0 +1,7 @@ + +# Wi-Fi station to PPPoS server + +This example demonstrate using NAPT to bring connectivity from WiFi station to PPPoS server. + +This example expect a PPPoS client to connect to the server and use the connectivity. +The client could be a Linux computer with `pppd` service or another microcontroller with PPP client (or another ESP32 with not WiFi interface) diff --git a/components/eppp_link/examples/slave/main/CMakeLists.txt b/components/eppp_link/examples/slave/main/CMakeLists.txt new file mode 100644 index 0000000000..2ba044442a --- /dev/null +++ b/components/eppp_link/examples/slave/main/CMakeLists.txt @@ -0,0 +1,2 @@ +idf_component_register(SRCS "station_example_main.c" + INCLUDE_DIRS ".") diff --git a/components/eppp_link/examples/slave/main/Kconfig.projbuild b/components/eppp_link/examples/slave/main/Kconfig.projbuild new file mode 100644 index 0000000000..ae4d7fb9a8 --- /dev/null +++ b/components/eppp_link/examples/slave/main/Kconfig.projbuild @@ -0,0 +1,21 @@ +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 ESP_MAXIMUM_RETRY + int "Maximum retry" + default 5 + help + Set the Maximum retry to avoid station reconnecting to the AP unlimited when the AP is really inexistent. + +endmenu diff --git a/components/eppp_link/examples/slave/main/idf_component.yml b/components/eppp_link/examples/slave/main/idf_component.yml new file mode 100644 index 0000000000..7ecb517e8a --- /dev/null +++ b/components/eppp_link/examples/slave/main/idf_component.yml @@ -0,0 +1,4 @@ +dependencies: + espressif/eppp_link: + version: "*" + override_path: "../../.." diff --git a/components/eppp_link/examples/slave/main/station_example_main.c b/components/eppp_link/examples/slave/main/station_example_main.c new file mode 100644 index 0000000000..eca2a7b5ff --- /dev/null +++ b/components/eppp_link/examples/slave/main/station_example_main.c @@ -0,0 +1,132 @@ +/* + * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD + * + * SPDX-License-Identifier: Unlicense OR CC0-1.0 + */ + +#include +#include "freertos/FreeRTOS.h" +#include "freertos/task.h" +#include "freertos/event_groups.h" +#include "esp_system.h" +#include "esp_wifi.h" +#include "esp_event.h" +#include "esp_log.h" +#include "nvs_flash.h" +#include "eppp_link.h" + +#include "lwip/err.h" +#include "lwip/sys.h" + +/* FreeRTOS event group to signal when we are connected*/ +static EventGroupHandle_t s_wifi_event_group; + +/* The event group allows multiple bits for each event, but we only care about two events: + * - we are connected to the AP with an IP + * - we failed to connect after the maximum amount of retries */ +#define WIFI_CONNECTED_BIT BIT0 +#define WIFI_FAIL_BIT BIT1 + +static const char *TAG = "sta2pppos"; + +static int s_retry_num = 0; + +static void event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) +{ + if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) { + esp_wifi_connect(); + } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) { + if (s_retry_num < CONFIG_ESP_MAXIMUM_RETRY) { + esp_wifi_connect(); + s_retry_num++; + ESP_LOGI(TAG, "retry to connect to the AP"); + } else { + xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT); + } + ESP_LOGI(TAG, "connect to the AP fail"); + } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) { + ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data; + ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip)); + s_retry_num = 0; + xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT); + } +} + +void wifi_init_sta(void) +{ + s_wifi_event_group = xEventGroupCreate(); + + ESP_ERROR_CHECK(esp_netif_init()); + + ESP_ERROR_CHECK(esp_event_loop_create_default()); + esp_netif_create_default_wifi_sta(); + + wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); + ESP_ERROR_CHECK(esp_wifi_init(&cfg)); + + esp_event_handler_instance_t instance_any_id; + esp_event_handler_instance_t instance_got_ip; + ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, + ESP_EVENT_ANY_ID, + &event_handler, + NULL, + &instance_any_id)); + ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, + IP_EVENT_STA_GOT_IP, + &event_handler, + NULL, + &instance_got_ip)); + + wifi_config_t wifi_config = { + .sta = { + .ssid = CONFIG_ESP_WIFI_SSID, + .password = CONFIG_ESP_WIFI_PASSWORD, + }, + }; + ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) ); + ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) ); + ESP_ERROR_CHECK(esp_wifi_start() ); + + ESP_LOGI(TAG, "wifi_init_sta finished."); + + /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum + * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */ + EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, + WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, + pdFALSE, + pdFALSE, + portMAX_DELAY); + + /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually + * happened. */ + if (bits & WIFI_CONNECTED_BIT) { + ESP_LOGI(TAG, "connected to ap SSID:%s password:%s", + CONFIG_ESP_WIFI_SSID, CONFIG_ESP_WIFI_PASSWORD); + } else if (bits & WIFI_FAIL_BIT) { + ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s", + CONFIG_ESP_WIFI_SSID, CONFIG_ESP_WIFI_PASSWORD); + } else { + ESP_LOGE(TAG, "UNEXPECTED EVENT"); + } +} + +void app_main(void) +{ + //Initialize NVS + esp_err_t ret = nvs_flash_init(); + if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) { + ESP_ERROR_CHECK(nvs_flash_erase()); + ret = nvs_flash_init(); + } + ESP_ERROR_CHECK(ret); + + ESP_LOGI(TAG, "ESP_WIFI_MODE_STA"); + wifi_init_sta(); + + esp_netif_t *eppp_netif = eppp_listen(); + if (eppp_netif == NULL) { + ESP_LOGE(TAG, "Failed to setup connection"); + return ; + } + ESP_ERROR_CHECK(esp_netif_napt_enable(eppp_netif)); +} diff --git a/components/eppp_link/examples/slave/sdkconfig.defaults b/components/eppp_link/examples/slave/sdkconfig.defaults new file mode 100644 index 0000000000..ec1a1a43b0 --- /dev/null +++ b/components/eppp_link/examples/slave/sdkconfig.defaults @@ -0,0 +1,8 @@ +CONFIG_UART_ISR_IN_IRAM=y +CONFIG_LWIP_IP_FORWARD=y +CONFIG_LWIP_IPV4_NAPT=y +CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=4096 +CONFIG_LWIP_PPP_SUPPORT=y +CONFIG_LWIP_PPP_SERVER_SUPPORT=y +CONFIG_LWIP_PPP_VJ_HEADER_COMPRESSION=n +CONFIG_EPPP_LINK_DEVICE_SPI=y