esp32 .uri = "/",

回答: 在ESP32中，如果你想将URI设置为"/"，你可以使用以下代码进行设置:

esp_mqtt_client_config_t mqtt_cfg = {
    .uri = "/"
};
esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_cfg);
esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler, client);
esp_mqtt_client_start(client);

这样，你就可以将URI设置为"/"，并且成功初始化ESP32的MQTT客户端。
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