esp_ble_gattc_prepare_write_char_descr() function

Prepare to write a characteristic descriptor value at a given handle

Syntax

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Declaration

Definition

from esp_gattc_api.h:911

esp_err_t esp_ble_gattc_prepare_write_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, uint16_t offset, uint16_t value_len, uint8_t *value, esp_gatt_auth_req_t auth_req);

Implemented in esp_gattc_api.c:748

Arguments

Argument

Description

gattc_if

GATT Client access interface

conn_id

Connection ID

handle

Characteristic descriptor handle to prepare to write

offset

The position offset to write

value_len

The length of the value to write in bytes

value

The value to write

auth_req

Authentication request type

Return value

- ESP_OK: Success - ESP_ERR_INVALID_STATE: The connection has not been established. - ESP_GATT_INVALID_HANDLE：Invalid `handle` - ESP_FAIL: Failure due to other reasons

Notes

1. This function triggers `ESP_GATTC_WRITE_CHAR_EVT`. 2. This function should be called only after the connection has been established. 3. `handle` must be greater than 0.

Examples

References

from examples

esp_ble_gattc_prepare_write_char_descr() function

Syntax

Arguments

Return value

Notes

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