ESP32 Forum

Posted: **Sun Jan 14, 2018 1:48 pm**

I am working on a BLE client and I see function esp_err_t esp_ble_gattc_open(esp_gatt_if_t gattc_if, esp_bd_addr_t remote_bda, bool is_direct) suceeds only with gattc_if = 0x03.

I tried finding relevant documentation and walking through the forums and found nothing definite.

My asumption is esp_gatt_if_t gattc_if has got to do with BLE addressing.

The reason being, my server is set with a Random Static Address, but in that light gattc_if = 0x01 should have worked

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typedef enum {
    BLE_ADDR_TYPE_PUBLIC        = 0x00,
    BLE_ADDR_TYPE_RANDOM        = 0x01,
    BLE_ADDR_TYPE_RPA_PUBLIC    = 0x02,
    BLE_ADDR_TYPE_RPA_RANDOM    = 0x03,
} esp_ble_addr_type_t;

What confuses me further is that we use different parameters for gattc_app_register/unregister

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esp_err_t esp_ble_gattc_app_register(uint16_t app_id);
esp_err_t esp_ble_gattc_app_unregister(esp_gatt_if_t gattc_if);

In btc_ble_gattc_args_t we store two different types for register and unregister

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    //BTC_GATTC_ACT_APP_REGISTER,
    struct app_reg_arg {
        uint16_t app_id;
    } app_reg;
    //BTC_GATTC_ACT_APP_UNREGISTER,
    struct app_unreg_arg {
        esp_gatt_if_t gattc_if;
    } app_unreg;

To sum it up. What is gattc_if?

Thank you so much

Posted: **Tue Jul 03, 2018 8:39 am**

GATT(S)_IF stands for GATT Interface Type. Different GATT clients will use different GATT interfaces, and its ID is passed to the registered callback. Documentation about this is still fairly murky.

ESP32 Forum

What is the use of esp_gatt_if_t?

What is the use of esp_gatt_if_t?

Re: What is the use of esp_gatt_if_t?