static void send_binary(esp_mqtt_client_handle_t client)
    spi_flash_mmap_handle_t out_handle;
    const void *binary_address;
    const esp_partition_t *partition = esp_ota_get_running_partition();
    esp_partition_mmap(partition, 0, partition->size, SPI_FLASH_MMAP_DATA, &binary_address, &out_handle);
    // sending only the configured portion of the partition (if it's less than the partition size)
    int binary_size = MIN(CONFIG_BROKER_BIN_SIZE_TO_SEND,partition->size);
    int msg_id = esp_mqtt_client_publish(client, "/topic/binary", binary_address, binary_size, 0, 0);
    ESP_LOGI(TAG, "binary sent with msg_id=%d", msg_id);
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