Issues with esp_ble_gatts_send_indicate - Gatts Server Service Table Demo and BLE interrogator (IDFGH-2304)

[jonhunterking66]

Environment

• Development Kit: [|ESP32-DevKitC]
• Kit version (for WroverKit/PicoKit/DevKitC): [v4]
• Module or chip used: [ESP32-WROOM-32D]
• IDF version: v4.1-dev-1086-g93a8603c5
• Build System: [Make|CMake]
• Compiler version (run xtensa-esp32-elf-gcc --version to find it): 8.2.0
• Operating System: [Linux]
• Power Supply: [USB]

Problem Description

When using a BLE interrogator I cannot receive notifications when using the esp_ble_gatts_send_indicate function

Expected Behavior

I expect that when I enable notifcations on the BLE scanner app after connection the value will updated as I call esp_ble_gatts_send_indicate

Actual Behavior

There is no change in value, all I receive is the string built in from the gatts server service table demo [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14]

Steps to repropduce

1. Open the Gatts Server Service table demo
2. Use the BLE scanner app

3. Add the following code to the end of the main function:

   uint8_t data[20] = {0x66, 0x66};
   while (true){
       ets_delay_us(100000);
   
       ret = esp_ble_gatts_send_indicate(heart_rate_profile_tab[IDX_CHAR_VAL_A].gatts_if, heart_rate_profile_tab[IDX_CHAR_VAL_A].conn_id, heart_rate_handle_table[IDX_CHAR_VAL_A], sizeof(data),data, false);
       if (ret){
           ESP_LOGE(GATTS_TABLE_TAG, "Send indication, error code = %x", ret);
           return;
       }
   
       data[0] = data[0] + 1;
   
   }

4. Flash code to ESP 32
5. Connect to device on BLE scanner app
6. Enable notifications for custom service

Here is the link to the example: https://github.com/espressif/esp-idf/tree/master/examples/bluetooth/bluedroid/ble/gatt_server_service_table

The code I added is above.

Any help is appreciated.

[gengyuchao]

Hi, because the Bluetooth protocol stack runs in freeRTOS, you should use vTaskDelay instead of ets_delay_us, otherwise it will stop the work of BT Stack.