chore(firmware): add initial implementation for WiFi connection and OCPP integration
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6
hardware/firmware/src/CMakeLists.txt
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6
hardware/firmware/src/CMakeLists.txt
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# This file was automatically generated for projects
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# without default 'CMakeLists.txt' file.
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FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
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idf_component_register(SRCS ${app_sources})
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196
hardware/firmware/src/main.c
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196
hardware/firmware/src/main.c
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// #include "esp_wifi.h"
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// #include <MicroOcpp_c.h>
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// void app_main() {}
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/* Based on the ESP-IDF WiFi station Example (see https://github.com/espressif/esp-idf/tree/release/v4.4/examples/wifi/getting_started/station/main)
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This example code extends the WiFi example with the necessary calls to establish an
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OCPP connection on the ESP-IDF.
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*/
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "lwip/err.h"
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#include "lwip/sys.h"
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/* MicroOcpp includes */
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#include <mongoose.h>
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#include <MicroOcpp_c.h> //C-facade of MicroOcpp
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#include <MicroOcppMongooseClient_c.h> //WebSocket integration for ESP-IDF
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/* The examples use WiFi configuration that you can set via project configuration menu
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_ESP_WIFI_SSID "MisakaNetwork"
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#define EXAMPLE_ESP_WIFI_PASS "20211028"
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#define EXAMPLE_ESP_MAXIMUM_RETRY 5
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#define EXAMPLE_MO_OCPP_BACKEND "ws://localhost:8180/steve/websocket/CentralSystemService"
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#define EXAMPLE_MO_CHARGEBOXID "CP0001"
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#define EXAMPLE_MO_AUTHORIZATIONKEY "authkey123"
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/* FreeRTOS event group to signal when we are connected*/
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static EventGroupHandle_t s_wifi_event_group;
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/* The event group allows multiple bits for each event, but we only care about two events:
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* - we are connected to the AP with an IP
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* - we failed to connect after the maximum amount of retries */
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#define WIFI_CONNECTED_BIT BIT0
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#define WIFI_FAIL_BIT BIT1
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static const char *TAG = "wifi station";
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static int s_retry_num = 0;
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static void event_handler(void *arg, esp_event_base_t event_base,
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int32_t event_id, void *event_data)
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{
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if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START)
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{
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esp_wifi_connect();
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}
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else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED)
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{
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if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY)
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{
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esp_wifi_connect();
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s_retry_num++;
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ESP_LOGI(TAG, "retry to connect to the AP");
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}
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else
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{
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xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
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}
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ESP_LOGI(TAG, "connect to the AP fail");
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}
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else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP)
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{
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ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
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ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
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s_retry_num = 0;
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xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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}
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}
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void wifi_init_sta(void)
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{
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s_wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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esp_netif_create_default_wifi_sta();
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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esp_event_handler_instance_t instance_any_id;
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esp_event_handler_instance_t instance_got_ip;
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ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
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ESP_EVENT_ANY_ID,
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&event_handler,
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NULL,
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&instance_any_id));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
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IP_EVENT_STA_GOT_IP,
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&event_handler,
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NULL,
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&instance_got_ip));
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_ESP_WIFI_SSID,
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.password = EXAMPLE_ESP_WIFI_PASS,
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/* Setting a password implies station will connect to all security modes including WEP/WPA.
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* However these modes are deprecated and not advisable to be used. Incase your Access point
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* doesn't support WPA2, these mode can be enabled by commenting below line */
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.threshold.authmode = WIFI_AUTH_WPA2_PSK,
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},
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};
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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ESP_LOGI(TAG, "wifi_init_sta finished.");
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/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
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* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
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EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
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WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
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pdFALSE,
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pdFALSE,
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portMAX_DELAY);
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/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
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* happened. */
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if (bits & WIFI_CONNECTED_BIT)
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{
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ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
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EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
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}
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else if (bits & WIFI_FAIL_BIT)
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{
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ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
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EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
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}
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else
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{
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ESP_LOGE(TAG, "UNEXPECTED EVENT");
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}
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/* The event will not be processed after unregister */
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ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
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ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
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vEventGroupDelete(s_wifi_event_group);
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}
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void app_main(void)
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{
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// Initialize NVS
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
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{
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK(ret);
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ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
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wifi_init_sta();
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/* Initialize Mongoose (necessary for MicroOcpp)*/
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struct mg_mgr mgr; // Event manager
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mg_mgr_init(&mgr); // Initialise event manager
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mg_log_set(MG_LL_DEBUG); // Set log level
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/* Initialize MicroOcpp */
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struct OCPP_FilesystemOpt fsopt = {.use = true, .mount = true, .formatFsOnFail = true};
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OCPP_Connection *osock = ocpp_makeConnection(&mgr,
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EXAMPLE_MO_OCPP_BACKEND,
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EXAMPLE_MO_CHARGEBOXID,
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EXAMPLE_MO_AUTHORIZATIONKEY, "", fsopt);
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ocpp_initialize(osock, "HeliosDA One", "RayineElec", fsopt, false);
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/* Enter infinite loop */
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while (1)
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{
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mg_mgr_poll(&mgr, 10);
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ocpp_loop();
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}
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/* Deallocate ressources */
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ocpp_deinitialize();
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ocpp_deinitConnection(osock);
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mg_mgr_free(&mgr);
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return;
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}
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