5

I am trying to connect a ESP8266 to a WiFi network hosted by another ESP8266. The problem is the ESP8266 shows the WiFi network during a WiFi scan but fails to connect to it with the error: no espnetwork found, reconnect after 1s.

Code for the ESP8266 hosting the network:

#include <osapi.h>
#include <user_interface.h>

void ICACHE_FLASH_ATTR user_init(void) {
    // Delays 1 second for my serial monitor to catch up
    for (int i = 0; i < 200; i++) os_delay_us(5000);

    gpio_init();
    uart_init(115200, 115200);

    wifi_softap_dhcps_stop();

    wifi_set_opmode(SOFTAP_MODE);

    struct softap_config softAPConfig = {
        .ssid = {0},
        .password = {0},
        .ssid_len = sizeof("espnetwork"),
        .authmode = AUTH_OPEN,
        .max_connection = 4,
        .beacon_interval = 100,
    };

    os_memcpy(softAPConfig.ssid, "espnetwork", sizeof("espnetwork"));

    wifi_softap_set_config(&softAPConfig);

    wifi_softap_dhcps_start();
}

uint32 ICACHE_FLASH_ATTR user_rf_cal_sector_set(void) {
    enum flash_size_map size_map = system_get_flash_size_map();
    uint32 rf_cal_sec = 0;

    switch (size_map) {
        case FLASH_SIZE_4M_MAP_256_256:
            rf_cal_sec = 128 - 5;
            break;

        case FLASH_SIZE_8M_MAP_512_512:
            rf_cal_sec = 256 - 5;
            break;

        case FLASH_SIZE_16M_MAP_512_512:
        case FLASH_SIZE_16M_MAP_1024_1024:
            rf_cal_sec = 512 - 5;
            break;

        case FLASH_SIZE_32M_MAP_512_512:
        case FLASH_SIZE_32M_MAP_1024_1024:
            rf_cal_sec = 1024 - 5;
            break;

        case FLASH_SIZE_64M_MAP_1024_1024:
            rf_cal_sec = 2048 - 5;
            break;
        case FLASH_SIZE_128M_MAP_1024_1024:
            rf_cal_sec = 4096 - 5;
            break;
        default:
            rf_cal_sec = 0;
            break;
    }
    return rf_cal_sec;
}

Code for the ESP8266 searching and connection to the network:

#include <osapi.h>
#include <user_interface.h>

static os_timer_t INIT_TIMER;

void ICACHE_FLASH_ATTR commScanCb(void *arg, STATUS status) {
    if (status != OK) return (void)os_printf("Scan Callback Error : %d", status);

    struct bss_info *scanInfo = (struct bss_info *)arg;
    struct bss_info *network  = NULL;

    while (scanInfo != NULL) {
        if (!os_strcmp(scanInfo->ssid, "espnetwork")) network = scanInfo;

        scanInfo = STAILQ_NEXT(scanInfo, next);
    }

    if (network == NULL) return (void)os_printf("Network Not Found");
    else os_printf("Found Network : %s\n", network->ssid);

    struct station_config config = { .bssid_set = 0 };

    os_memset(config.ssid, 0, 32);
    os_memcpy(config.ssid, network->ssid, 32);

    wifi_station_set_config(&config);

    wifi_station_connect() ? os_printf("WiFi Connect Started\n") : os_printf("WiFi Connect Failed\n");
}

void ICACHE_FLASH_ATTR afterInit(void *arg) {
    os_timer_disarm(&INIT_TIMER);

    wifi_station_scan(NULL, commScanCb);
}

void ICACHE_FLASH_ATTR user_init(void) {
    // Delays 1 second for my serial monitor to catch up
    for (int i = 0; i < 200; i++) os_delay_us(5000);

    gpio_init();
    uart_init(115200, 115200);
    
    wifi_station_set_auto_connect(0);

    wifi_set_opmode(STATION_MODE);

    os_timer_disarm(&INIT_TIMER);
    os_timer_setfn(&INIT_TIMER, (os_timer_func_t *)afterInit, NULL);
    os_timer_arm(&INIT_TIMER, 1000, 1);
}

uint32 ICACHE_FLASH_ATTR user_rf_cal_sector_set(void) {
    enum flash_size_map size_map = system_get_flash_size_map();
    uint32 rf_cal_sec = 0;

    switch (size_map) {
        case FLASH_SIZE_4M_MAP_256_256:
            rf_cal_sec = 128 - 5;
            break;

        case FLASH_SIZE_8M_MAP_512_512:
            rf_cal_sec = 256 - 5;
            break;

        case FLASH_SIZE_16M_MAP_512_512:
        case FLASH_SIZE_16M_MAP_1024_1024:
            rf_cal_sec = 512 - 5;
            break;

        case FLASH_SIZE_32M_MAP_512_512:
        case FLASH_SIZE_32M_MAP_1024_1024:
            rf_cal_sec = 1024 - 5;
            break;

        case FLASH_SIZE_64M_MAP_1024_1024:
            rf_cal_sec = 2048 - 5;
            break;
        case FLASH_SIZE_128M_MAP_1024_1024:
            rf_cal_sec = 4096 - 5;
            break;
        default:
            rf_cal_sec = 0;
            break;
    }
    return rf_cal_sec;
}

Log from the ESP8266 trying to connect to the network:

mode : sta(5c:cf:7f:f6:54:cb)
add if0
scandone
Found Network : espnetwork
WiFi Connect Started
scandone
no espnetwork found, reconnect after 1s
reconnect
scandone
no espnetwork found, reconnect after 1s
reconnect
scandone
no espnetwork found, reconnect after 1s
reconnect

This log shows that the ESP8266 finds the network (line 4) but then fails to connect and then indefinitely tries to reconnect.

I have tried to change the auth mode of the WiFi network and give it a password, I have also tried setting bssid_set to 1 and passing in the bssid of the WiFi network but in both cases the same error arises.

Improve this question
9
  • STATIONAP acts as an access point AND joins an existing network. You don't have the existing network. I think you want one in SOFTAP and the other in STATION mode. Commented Jul 26, 2021 at 17:06
  • @stark I know. I would like to expand the network with more ESP8266s into a mesh, so all need to be able to host a softap and be a station. To test I tried making one only a softap and the other only a station but the station still receives the same error. Commented Jul 26, 2021 at 17:18
  • @stark I was trying to connect the ESP8266s together, so I swapped the CURRENT_SSID and OTHER_SSID when uploading to each ESP8266. Then I powered on the first which would host a softap and not find the other ESP8266. After I powered on the second which should host a softap and then find the other and connect to it but it gives the error. Commented Jul 26, 2021 at 17:30
  • @stark I have added more context. Sorry I didn't put many details in at the start. Commented Jul 26, 2021 at 18:08
  • I suggest you look into ESP-NOW instead of using classical WiFi for your setup: randomnerdtutorials.com/esp-now-esp8266-nodemcu-arduino-ide Commented Jul 27, 2021 at 5:30

1 Answer 1

Reset to default
0

The problem is with the SoftAP code. When setting the softap_config I used sizeof instead of strlen or not setting it at all, leading it to host a network with a null char in the SSID.

Fixed Example:

#include <osapi.h>
#include <user_interface.h>

void ICACHE_FLASH_ATTR user_init(void) {
    // Delays 1 second for my serial monitor to catch up
    for (int i = 0; i < 200; i++) os_delay_us(5000);

    gpio_init();
    uart_init(115200, 115200);

    wifi_softap_dhcps_stop();

    wifi_set_opmode(SOFTAP_MODE);

    struct softap_config softAPConfig = {
        .ssid = {0},
        .password = {0},
        .authmode = AUTH_OPEN,
        .max_connection = 4,
        .beacon_interval = 100,
    };

    os_memcpy(softAPConfig.ssid, "espnetwork", sizeof("espnetwork"));

    wifi_softap_set_config(&softAPConfig);

    wifi_softap_dhcps_start();
}

uint32 ICACHE_FLASH_ATTR user_rf_cal_sector_set(void) {
    enum flash_size_map size_map = system_get_flash_size_map();
    uint32 rf_cal_sec = 0;

    switch (size_map) {
        case FLASH_SIZE_4M_MAP_256_256:
            rf_cal_sec = 128 - 5;
            break;

        case FLASH_SIZE_8M_MAP_512_512:
            rf_cal_sec = 256 - 5;
            break;

        case FLASH_SIZE_16M_MAP_512_512:
        case FLASH_SIZE_16M_MAP_1024_1024:
            rf_cal_sec = 512 - 5;
            break;

        case FLASH_SIZE_32M_MAP_512_512:
        case FLASH_SIZE_32M_MAP_1024_1024:
            rf_cal_sec = 1024 - 5;
            break;

        case FLASH_SIZE_64M_MAP_1024_1024:
            rf_cal_sec = 2048 - 5;
            break;
        case FLASH_SIZE_128M_MAP_1024_1024:
            rf_cal_sec = 4096 - 5;
            break;
        default:
            rf_cal_sec = 0;
            break;
    }
    return rf_cal_sec;
}

Thank you for all the help.

Improve this answer
Sign up to request clarification or add additional context in comments.

Comments

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.