Connects as a component to your program
Uses websocket protocol
Connects to any web server on esp32 that uses the websocket protocol, for example (esp-idf examples/protocols/http_server/ws_echo_server)
Example - example_ota_ws
Web interface
- Select firmware file
- Upload firmware to esp32
- Firmware download control
- After updating the firmware - confirm the update or roll back to the previous version
Select OTA page URI in menuconfig
The update is downloaded in fragments, the size of the download fragment is in menuconfig
Connection example

#include "ota_ws_update.h" // handler definition

// start webserver from esp-idf "examples/protocols/http_server/ws_echo_server"
static httpd_handle_t start_webserver(void)
{
    httpd_handle_t server = NULL;
    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
    // Start the httpd server
    ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
    if (httpd_start(&server, &config) == ESP_OK) {
        ESP_LOGI(TAG, "Registering URI handlers");
    /****************** Registering the ws handler ****************/
        ota_ws_register_uri_handler(server);
        // end register ota_ws handler
        return server;
    }
    ESP_LOGI(TAG, "Error starting server!");
    return NULL;
}

Example partitions.csv

# Name,   Type, SubType,  Offset,   Size,  Flags
nvs,      data, nvs,      0x9000,  0x4000
otadata,  data, ota,      ,  0x2000
phy_init, data, phy,      ,  0x1000
ota_0,    app,  ota_0,    ,  1M
ota_1,    app,  ota_1,    ,  1M

menuconfig options
- CONFIG_PARTITION_TABLE_CUSTOM=y
- CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions.csv"
- CONFIG_HTTPD_WS_SUPPORT=y
- CONFIG_APP_ROLLBACK_ENABLE=y