77ba81e996
As initially planned starting wifi only when needed, at change to HTTP mode.
Tested this on breakout board: ESP32 is not getting hot anymore!
Also optimized timeout: only notify "forgot to turn off" when battery is below certain
threshold (e.g. disable when charger is connected over night)
main:
- dont start wifi at startup anymore
- remove double-initialization of nvs
already initialized in wifi.c, thus removed some code
- optimize comments, logging
control:
- timeout "forgot to turn off": Add battery threshold
- start/stop wifi when switching to/from HTTP mode
wifi:
- split init function to separate functions for NVS and NETIF (more clear in main)
- optimize log output at nvs init (moved from main)
- rename start/stop functions, formatting
290 lines
9.4 KiB
C
290 lines
9.4 KiB
C
#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_mac.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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#include "wifi.h"
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//--- variables used for ap and wifi ---
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static const char *TAG = "wifi";
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static esp_event_handler_instance_t instance_any_id;
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//##########################################
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//############ common functions ############
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//##########################################
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//============================
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//========= init nvs =========
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//============================
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//initialize nvs-flash (needed for both AP and CLIENT)
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//has to be run once at startup
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void wifi_initNvs(){
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//Initialize NVS (needed for wifi)
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esp_err_t err = nvs_flash_init();
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if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND)
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{
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ESP_LOGE(TAG, "NVS truncated -> deleting flash");
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// Retry nvs_flash_init
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ESP_ERROR_CHECK(nvs_flash_erase());
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err = nvs_flash_init();
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}
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ESP_ERROR_CHECK(err);
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}
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//==============================
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//========= init netif =========
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//==============================
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//initialize netif (needed for both AP and CLIENT)
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//has to be run once at startup
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void wifi_initNetif(){
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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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}
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//############################################
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//############### access point ###############
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//############################################
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//--------------------------------------------
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//------ configuration / declarations --------
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//--------------------------------------------
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#define EXAMPLE_ESP_WIFI_SSID_AP "armchair"
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#define EXAMPLE_ESP_WIFI_PASS_AP ""
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#define EXAMPLE_ESP_WIFI_CHANNEL_AP 1
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#define EXAMPLE_MAX_STA_CONN_AP 4
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static esp_netif_t *ap;
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static void wifi_event_handler_ap(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_id == WIFI_EVENT_AP_STACONNECTED) {
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wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
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ESP_LOGI(TAG, "station "MACSTR" join, AID=%d",
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MAC2STR(event->mac), event->aid);
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} else if (event_id == WIFI_EVENT_AP_STADISCONNECTED) {
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wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
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ESP_LOGI(TAG, "station "MACSTR" leave, AID=%d",
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MAC2STR(event->mac), event->aid);
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}
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}
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//========================
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//====== start AP ========
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//========================
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void wifi_start_ap(void)
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{
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ap = esp_netif_create_default_wifi_ap();
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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_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
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ESP_EVENT_ANY_ID,
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&wifi_event_handler_ap,
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NULL,
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&instance_any_id));
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wifi_config_t wifi_config = {
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.ap = {
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.ssid = EXAMPLE_ESP_WIFI_SSID_AP,
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.ssid_len = strlen(EXAMPLE_ESP_WIFI_SSID_AP),
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.channel = EXAMPLE_ESP_WIFI_CHANNEL_AP,
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.password = EXAMPLE_ESP_WIFI_PASS_AP,
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.max_connection = EXAMPLE_MAX_STA_CONN_AP,
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.authmode = WIFI_AUTH_WPA_WPA2_PSK
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},
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};
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if (strlen(EXAMPLE_ESP_WIFI_PASS_AP) == 0) {
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wifi_config.ap.authmode = WIFI_AUTH_OPEN;
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}
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
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ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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ESP_LOGI(TAG, "wifi_init_softap finished. SSID:%s password:%s channel:%d",
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EXAMPLE_ESP_WIFI_SSID_AP, EXAMPLE_ESP_WIFI_PASS_AP, EXAMPLE_ESP_WIFI_CHANNEL_AP);
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}
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//=============================
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//========== stop AP ==========
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//=============================
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void wifi_stop_ap(void)
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{
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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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ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
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esp_wifi_stop();
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esp_wifi_deinit();
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esp_netif_destroy_default_wifi(ap);
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}
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//##########################################
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//################# client #################
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//##########################################
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//--------------------------------------------
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//------ configuration / declarations --------
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//--------------------------------------------
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#define EXAMPLE_ESP_WIFI_SSID_CLIENT "BKA-network"
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#define EXAMPLE_ESP_WIFI_PASS_CLIENT "airwaveslogitech410"
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#define EXAMPLE_ESP_MAXIMUM_RETRY_CLIENT 10
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static esp_netif_t *sta;
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static esp_event_handler_instance_t instance_got_ip;
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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 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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esp_wifi_connect();
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} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
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if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY_CLIENT) {
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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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} else {
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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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} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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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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//===========================
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//====== init client ========
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//===========================
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void wifi_start_client(void)
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{
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s_wifi_event_group = xEventGroupCreate();
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sta = esp_netif_create_default_wifi_sta();
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//set static ip
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esp_netif_dhcpc_stop(sta);
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esp_netif_ip_info_t ip_info;
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IP4_ADDR(&ip_info.ip, 10, 0, 0, 66);
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IP4_ADDR(&ip_info.gw, 10, 0, 0, 1);
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IP4_ADDR(&ip_info.netmask, 255, 255, 0, 0);
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esp_netif_set_ip_info(sta, &ip_info);
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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_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_CLIENT,
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.password = EXAMPLE_ESP_WIFI_PASS_CLIENT,
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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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ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
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EXAMPLE_ESP_WIFI_SSID_CLIENT, EXAMPLE_ESP_WIFI_PASS_CLIENT);
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} else if (bits & WIFI_FAIL_BIT) {
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ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
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EXAMPLE_ESP_WIFI_SSID_CLIENT, EXAMPLE_ESP_WIFI_PASS_CLIENT);
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} else {
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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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//===============================
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//========= stop client =========
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//===============================
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void wifi_stop_client(void)
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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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esp_wifi_stop();
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esp_wifi_deinit();
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esp_netif_destroy_default_wifi(sta);
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}
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