ESP32 Forum

ESP32 Official Forum
http://esp32.io/

WiFi not generating WIFI_EVENT_STA_DISCONNECTED event

http://esp32.io/viewtopic.php?f=13&t=24368

Page 1 of 1

WiFi not generating WIFI_EVENT_STA_DISCONNECTED event

Posted: Sat Nov 13, 2021 8:04 pm
by rasto.tichy
Hello all,

new to ESP32 and to this forum.

I'm using wifi_station from esp-idf example to connect to wifi to send temperatures from onewire sensor to mqtt server. ESP will connect to wifi without problems and connection is stable. I'm receiving and processing events using event_handler function.

BUT - event_handler function is not called when wifi is disconnected (e.g. Access Point rebooted). So I'm not able to react to lost wifi connection.

event_handler calls print similar line in the log

Code: Select all

wifi station: Event dispatched from event loop base=WIFI_EVENT, event_id=4
I'm using esp-idf v4.4-dev-2977-gdd491ee851

In the log below, you can see when wifi AP was rebooted at the end. There was no WIFI_EVENT received by the handler. I can force ESP to reconnect by manually calling esp_wifi_connect(), which will reestablish connection without problems.

Code: Select all

I (461) onewire: OneWire Initialized
I (491) onewire: Found device 0: 1d000001b437cc28
I (501) onewire: Device 0 set as DS18B20
I (581) wifi:wifi driver task: 3ffc00c0, prio:23, stack:6656, core=0
I (581) system_api: Base MAC address is not set
I (581) system_api: read default base MAC address from EFUSE
I (601) wifi:wifi firmware version: d683787
I (601) wifi:wifi certification version: v7.0
I (601) wifi:config NVS flash: enabled
I (601) wifi:config nano formating: disabled
I (601) wifi:Init data frame dynamic rx buffer num: 32
I (611) wifi:Init management frame dynamic rx buffer num: 32
I (611) wifi:Init management short buffer num: 32
I (621) wifi:Init dynamic tx buffer num: 32
I (621) wifi:Init static rx buffer size: 1600
I (621) wifi:Init static rx buffer num: 10
I (631) wifi:Init dynamic rx buffer num: 32
I (631) wifi_init: rx ba win: 6
I (641) wifi_init: tcpip mbox: 32
I (641) wifi_init: udp mbox: 6
I (641) wifi_init: tcp mbox: 6
I (651) wifi_init: tcp tx win: 5744
I (651) wifi_init: tcp rx win: 5744
I (661) wifi_init: tcp mss: 1440
I (661) wifi_init: WiFi IRAM OP enabled
I (661) wifi_init: WiFi RX IRAM OP enabled
I (671) phy_init: phy_version 4670,719f9f6,Feb 18 2021,17:07:07
I (781) wifi:mode : sta (24:6f:28:b2:3e:60)
I (781) wifi:enable tsf
I (781) wifi station: wifi_init_sta finished.
I (781) wifi station: Event dispatched from event loop base=WIFI_EVENT, event_id=2
I (791) wifi station: wifi event: 2
I (791) wifi station: wifi connect called
I (801) wpa: BSS: Add new id 0 BSSID 18:e8:29:a6:e6:39 SSID 'loulou' chan 11
I (811) wifi:new:<11,0>, old:<1,0>, ap:<255,255>, sta:<11,0>, prof:1
I (811) wifi:state: init -> auth (b0)
I (821) wifi:state: auth -> assoc (0)
I (821) wifi:state: assoc -> run (10)
I (841) wifi:connected with loulou, aid = 2, channel 11, BW20, bssid = 18:e8:29:a6:e6:39
I (841) wifi:security: WPA2-PSK, phy: bgn, rssi: -66
I (851) wifi:pm start, type: 1
I (851) wifi station: Event dispatched from event loop base=WIFI_EVENT, event_id=4
I (851) wifi station: wifi event: 4
I (921) wifi:AP's beacon interval = 102400 us, DTIM period = 2
I (1571) esp_netif_handlers: sta ip: 192.168.1.139, mask: 255.255.255.0, gw: 192.168.1.1
I (1571) wifi station: Event dispatched from event loop base=IP_EVENT, event_id=0
I (1571) wifi station: got ip:192.168.1.139
I (1581) wifi station: connected to ap SSID:loulou password:Un-loulou-qui-chantait
I (1591) onewire: Convert all DS18B20
I (2201) onewire: Device 0: Read Temperature
I (2211) onewire: Device 0: Temperature: 28.750000
W (5941) wifi:<ba-add>idx:0 (ifx:0, 18:e8:29:a6:e6:39), tid:0, ssn:1, winSize:64
I (54131) wifi:bcn_timout,ap_probe_send_start
I (56631) wifi:ap_probe_send over, resett wifi status to disassoc
I (56631) wifi:state: run -> init (c800)
I (56631) wifi:pm stop, total sleep time: 45291222 us / 55787413 us
W (56641) wifi:<ba-del>idx
I (56641) wifi:new:<11,0>, old:<11,0>, ap:<255,255>, sta:<11,0>, prof:1
What am I doing wrong?

Thanks and have fun

Rasto

Re: WiFi not generating WIFI_EVENT_STA_DISCONNECTED event

Posted: Mon Nov 15, 2021 2:59 am
by mikemoy
Without seeing any code how can we know ?

Re: WiFi not generating WIFI_EVENT_STA_DISCONNECTED event

Posted: Mon Nov 15, 2021 7:37 pm
by rasto.tichy
OK, here it goes.

I upgraded esp-idf to latest (hopefully) version: v4.4-dev-2977-gdd491ee851
I took esp-idf/examples/wifi/getting_started/station/main/station_example_main.c

Same situation - wifi will connect:

Code: Select all

I (524) wifi station: ESP_WIFI_MODE_STA
I (534) wifi:wifi driver task: 3ffc0344, prio:23, stack:6656, core=0
I (534) system_api: Base MAC address is not set
I (534) system_api: read default base MAC address from EFUSE
I (554) wifi:wifi firmware version: cca42a5
I (554) wifi:wifi certification version: v7.0
I (554) wifi:config NVS flash: enabled
I (554) wifi:config nano formating: disabled
I (554) wifi:Init data frame dynamic rx buffer num: 32
I (564) wifi:Init management frame dynamic rx buffer num: 32
I (564) wifi:Init management short buffer num: 32
I (574) wifi:Init dynamic tx buffer num: 32
I (574) wifi:Init static rx buffer size: 1600
I (574) wifi:Init static rx buffer num: 10
I (584) wifi:Init dynamic rx buffer num: 32
I (584) wifi_init: rx ba win: 6
I (594) wifi_init: tcpip mbox: 32
I (594) wifi_init: udp mbox: 6
I (594) wifi_init: tcp mbox: 6
I (604) wifi_init: tcp tx win: 5744
I (604) wifi_init: tcp rx win: 5744
I (614) wifi_init: tcp mss: 1440
I (614) wifi_init: WiFi IRAM OP enabled
I (614) wifi_init: WiFi RX IRAM OP enabled
I (624) phy_init: phy_version 4670,719f9f6,Feb 18 2021,17:07:07
I (734) wifi:mode : sta (24:6f:28:b2:3e:60)
I (734) wifi:enable tsf
I (734) wifi station: wifi_init_sta finished.
I (734) wifi station: Event dispatched from event loop base=WIFI_EVENT, event_id=2
I (754) wifi:new:<11,0>, old:<1,0>, ap:<255,255>, sta:<11,0>, prof:1
I (754) wifi:state: init -> auth (b0)
I (764) wifi:state: auth -> assoc (0)
I (764) wifi:state: assoc -> run (10)
I (774) wifi:connected with loulou, aid = 1, channel 11, BW20, bssid = 18:e8:29:a6:e6:39
I (774) wifi:security: WPA2-PSK, phy: bgn, rssi: -58
I (784) wifi:pm start, type: 1
I (784) wifi station: Event dispatched from event loop base=WIFI_EVENT, event_id=4
I (824) wifi:AP's beacon interval = 102400 us, DTIM period = 2
I (1524) esp_netif_handlers: sta ip: 192.168.1.139, mask: 255.255.255.0, gw: 192.168.1.1
I (1524) wifi station: Event dispatched from event loop base=IP_EVENT, event_id=0
I (1534) wifi station: got ip:192.168.1.139
I (1534) wifi station: connected to ap SSID:myssid password:mypassword
W (5954) wifi:<ba-add>idx:0 (ifx:0, 18:e8:29:a6:e6:39), tid:0, ssn:1, winSize:64
but event_handler is not called when the wifi access point is switched off and I only get this in the log:

Code: Select all

I (46104) wifi:state: run -> init (3c0)
I (46114) wifi:pm stop, total sleep time: 43144929 us / 45328908 us
W (46114) wifi:<ba-del>idx
I (46114) wifi:new:<11,0>, old:<11,0>, ap:<255,255>, sta:<11,0>, prof:1
Here is the full code:

Code: Select all

/* WiFi station Example

   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 <string.h>
#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 "lwip/err.h"
#include "lwip/sys.h"

/* The examples use WiFi configuration that you can set via project configuration menu

   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
#define EXAMPLE_ESP_MAXIMUM_RETRY  CONFIG_ESP_MAXIMUM_RETRY

/* 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 = "wifi station";

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)
{
    ESP_LOGI(TAG, "Event dispatched from event loop base=%s, event_id=%d", event_base, event_id);	
    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 < EXAMPLE_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 = EXAMPLE_ESP_WIFI_SSID,
            .password = EXAMPLE_ESP_WIFI_PASS,
            /* Setting a password implies station will connect to all security modes including WEP/WPA.
             * However these modes are deprecated and not advisable to be used. Incase your Access point
             * doesn't support WPA2, these mode can be enabled by commenting below line */
	     .threshold.authmode = WIFI_AUTH_WPA2_PSK,

            .pmf_cfg = {
                .capable = true,
                .required = false
            },
        },
    };
    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",
                 EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
    } else if (bits & WIFI_FAIL_BIT) {
        ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
                 EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
    } else {
        ESP_LOGE(TAG, "UNEXPECTED EVENT");
    }

    /* The event will not be processed after unregister */
    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
    vEventGroupDelete(s_wifi_event_group);
}

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();
}
How do I get the code to react on wifi disconnection and retry connecting back?

Thanks

Rasto

Re: WiFi not generating WIFI_EVENT_STA_DISCONNECTED event

Posted: Fri Mar 01, 2024 2:40 pm
by mtaz78
Hi Rasto,

the problem lies in these two lines

[Codebox]
/* The event will not be processed after unregister */
ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
[/Codebox]


unregistering the event it will not be triggered.
All times are UTC
Page 1 of 1
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/