I use example project NimBLE_GATT_Server in ESPIDF V5.4.0, and i add some code in this example try to describe an attribute, but it's failure. The phenomenon is as follows: i use Nrf Connect android application to connect to the ESP32-C3 board, when i click the Descriptor read button, app shows: Error 2(0x2):GATT READ NOT PERMIT, How can I solve this problem?
Code as follows:
Code: Select all
/* Wifi config service */
static const ble_uuid128_t wifi_config_svc_uuid = BLE_UUID128_INIT(0x2d, 0x71, 0xa2, 0x59, 0xb4, 0x58, 0xc8, 0x12,
0x99, 0x99, 0x43, 0x95, 0x12, 0x2f, 0x46, 0x59);
static uint16_t wifi_config_chr_val_handle;
static const ble_uuid128_t wifi_config_chr_uuid = BLE_UUID128_INIT(0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22, 0x33, 0x33, 0x33, 0x33);
static const ble_uuid128_t wifi_config_desc_uuid = BLE_UUID128_INIT(0x01, 0x01, 0x01, 0x01, 0x12, 0x12, 0x12, 0x12,
0x23, 0x23, 0x23, 0x23, 0x34, 0x34, 0x34, 0x34);
/* GATT services table */
static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
/* Wifi config service */
{
.type = BLE_GATT_SVC_TYPE_PRIMARY,
.uuid = &wifi_config_svc_uuid.u,
.characteristics =
(struct ble_gatt_chr_def[]){
{.uuid = &wifi_config_chr_uuid.u,
.descriptors = (struct ble_gatt_dsc_def[]){
{
.uuid = &wifi_config_desc_uuid.u,
.att_flags = BLE_GATT_CHR_F_READ ,
.access_cb = wifi_config_chr_access,
},
{
0 // No more descriptors
},
},
.access_cb = wifi_config_chr_access,
.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_INDICATE,
.val_handle = &wifi_config_chr_val_handle},
{0}
},
},
{
0, /* No more services. */
},
};
static int wifi_config_chr_access(uint16_t conn_handle, uint16_t attr_handle,
struct ble_gatt_access_ctxt *ctxt, void *arg)
{
/* Local variables */
int rc = 0;
const ble_uuid_t *uuid;
ESP_LOGE(TAG,
"access operation to wifi config characteristic, opcode: %d",
ctxt->op);
/* Handle access events */
/* Note: Wifi config characteristic is write only */
switch (ctxt->op)
{
/* Write characteristic event */
case BLE_GATT_ACCESS_OP_WRITE_CHR:
/* Verify connection handle */
if (conn_handle != BLE_HS_CONN_HANDLE_NONE)
{
ESP_LOGI(TAG, "characteristic write; conn_handle=%d attr_handle=%d",
conn_handle, attr_handle);
}
else
{
ESP_LOGI(TAG,
"characteristic write by nimble stack; attr_handle=%d",
attr_handle);
}
/* Verify attribute handle */
if (attr_handle == wifi_config_chr_val_handle)
{
/* Process the received data for WiFi configuration */
/* Verify access buffer length */
if (ctxt->om->om_len > 0 && ctxt->om->om_len < 30)
{
/* Turn the LED on or off according to the operation bit */
ESP_LOGI(TAG, "wifi config:%s", ctxt->om->om_data);
}
else
{
goto error;
}
return rc;
}
case BLE_GATT_ACCESS_OP_READ_CHR:
ESP_LOGI(TAG, "characteristic read; conn_handle=%d attr_handle=%d",
conn_handle, attr_handle);
break;
case BLE_GATT_ACCESS_OP_READ_DSC:
ESP_LOGI(TAG, "descriptor read; conn_handle=%d attr_handle=%d",
conn_handle, attr_handle);
if (conn_handle != BLE_HS_CONN_HANDLE_NONE)
{
ESP_LOGI(TAG, "Descriptor read; conn_handle=%d attr_handle=%d\n",
conn_handle, attr_handle);
}
else
{
ESP_LOGI(TAG, "Descriptor read by NimBLE stack; attr_handle=%d\n",
attr_handle);
}
uuid = ctxt->dsc->uuid;
if (ble_uuid_cmp(uuid, &wifi_config_desc_uuid.u) == 0)
{
rc = os_mbuf_append(ctxt->om,
"wifi config",
11);
return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
}
default:
goto error;
}
error:
ESP_LOGE(TAG,
"unexpected access operation to wifi config characteristic, opcode: %d",
ctxt->op);
return BLE_ATT_ERR_UNLIKELY;
}
Code: Select all
I (323) main_task: Started on CPU0
I (323) main_task: Calling app_main()
I (323) NimBLE_GATT_Server: example configured to blink addressable led!
I (333) BLE_INIT: BT controller compile version [d752dea]
I (333) BLE_INIT: Bluetooth MAC: 7c:df:a1:ba:4d:62
I (333) phy_init: phy_version 1180,01f2a49,Jun 4 2024,16:34:25
I (403) NimBLE_GATT_Server: nimble host task has been started!
I (403) NimBLE: GAP procedure initiated: stop advertising.
I (403) NimBLE_GATT_Server: device address: 62:4D:BA:A1:DF:7C
I (403) NimBLE: GAP procedure initiated: advertise;
I (413) NimBLE: disc_mode=2
I (413) NimBLE: adv_channel_map=0 own_addr_type=0 adv_filter_policy=0 adv_itvl_min=800 adv_itvl_max=816
I (423) NimBLE:
I (423) NimBLE_GATT_Server: advertising started!
I (433) NimBLE_GATT_Server: heart rate task has been started!
I (433) main_task: Returned from app_main()
I (3003) NimBLE_GATT_Server: connection established; status=0
I (3003) NimBLE_GATT_Server: connection handle: 1
I (3003) NimBLE_GATT_Server: device id address: type=0, value=62:4D:BA:A1:DF:7C
I (3013) NimBLE_GATT_Server: peer id address: type=1, value=45:9C:4C:B5:57:50
I (3013) NimBLE_GATT_Server: conn_itvl=24, conn_latency=0, supervision_timeout=500, encrypted=0, authenticated=0, bonded=0
I (3033) NimBLE: GAP procedure initiated:
I (3033) NimBLE: connection parameter update; conn_handle=1 itvl_min=24 itvl_max=24 latency=3 supervision_timeout=500 min_ce_len=0 max_ce_len=0
I (3043) NimBLE:
I (3483) NimBLE_GATT_Server: connection updated; status=0
I (3483) NimBLE_GATT_Server: connection handle: 1
I (3483) NimBLE_GATT_Server: device id address: type=0, value=62:4D:BA:A1:DF:7C
I (3493) NimBLE_GATT_Server: peer id address: type=1, value=45:9C:4C:B5:57:50
I (3493) NimBLE_GATT_Server: conn_itvl=24, conn_latency=3, supervision_timeout=500, encrypted=0, authenticated=0, bonded=0
I (4263) NimBLE_GATT_Server: connection updated; status=0
I (4263) NimBLE_GATT_Server: connection handle: 1
I (4263) NimBLE_GATT_Server: device id address: type=0, value=62:4D:BA:A1:DF:7C
I (4273) NimBLE_GATT_Server: peer id address: type=1, value=45:9C:4C:B5:57:50
I (4283) NimBLE_GATT_Server: conn_itvl=6, conn_latency=0, supervision_timeout=500, encrypted=0, authenticated=0, bonded=0
I (4473) NimBLE_GATT_Server: connection updated; status=0
I (4473) NimBLE_GATT_Server: connection handle: 1
I (4473) NimBLE_GATT_Server: device id address: type=0, value=62:4D:BA:A1:DF:7C
I (4483) NimBLE_GATT_Server: peer id address: type=1, value=45:9C:4C:B5:57:50
I (4483) NimBLE_GATT_Server: conn_itvl=24, conn_latency=3, supervision_timeout=500, encrypted=0, authenticated=0, bonded=0
