BLE library stack size

[vtomanov]

Any suggestion how I can increase the stack size in the BLE library (callbacks) ?

[chegewara]

Usually its not needed, but you can start new task and start BLE from it.

[vtomanov]

Where I can find a example how to start my own task and start the BLE from it ?
(so far I have seen only examples that the BLE LIB is doing everything it self)

[chegewara]

Its common use. Just create normal task, let say somewhere on start your app, then move to it all BLE related functions, like init, start advertising or start scan etc.

[vtomanov]

you mean the BLE lib checks of it runs on the main thread/task and if YES create its own but in NOT then continue running on the current one ?

e.g. if it is started inside a RTOS task/thread the callback will be the same task/thread ?
(as currently the callbacks are on another task/thread)

this is the current scenario - all called on the setup() function 👍

---

BLEDevice::init(String(BLE_NAME_PREFIX + String(GetSetupDeviceName()) + ")").c_str());
BLEDevice::setMTU(BLE_DEFAULT_MTU);
// Create the BLE Server
bleServer = BLEDevice::createServer();
bleServer->setCallbacks(new bleServiceCallbacks());

// Create the BLE Service
BLEService *pService = bleServer->createService(BLE_SERVICE_UUID);

// Create input BLE Characteristic
bleCharacteristicInTransport = pService->createCharacteristic(
BLE_CHARACTERISTIC_TRANSPORT_IN_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);

bleCharacteristicInTransport->setCallbacks(new bleCharacteristicInTransportCallback());

// Create a BLE Descriptor
bleCharacteristicInTransport->addDescriptor(new BLE2902());

// Create output BLE Characteristic
bleCharacteristicOutTransport = pService->createCharacteristic(
BLE_CHARACTERISTIC_TRANSPORT_OUT_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);

// Create a BLE Descriptor
bleCharacteristicOutTransport->addDescriptor(new BLE2902());

// Start the service
pService->start();

LOG64_SET(F("BLE: CONNECTED : START NOTIFY"));
LOG64_NEW_LINE;
// Start advertising

bleServer->getAdvertising()->setScanResponse(true);
bleServer->getAdvertising()->setMinPreferred(0x06);
bleServer->getAdvertising()->setMaxPreferred(0x12);
bleServer->getAdvertising()->start();

[chegewara]

This looks like usual use case, in which default arduino stack should be enough.
If you have problem with stack i would suggest to check stack water mark.

You can create new task in setup, and like i said earlier, move all BLE init stuff to new task. Callbacks will be called from new task, but global data can be accessible from other tasks too, also in loop.

[vtomanov]

The issue is inside the callbacks - e.g. I want to change the callbacks task stack size..

[chegewara]

Do you have logs? Do you track stack watermark?

[vtomanov]

also I have some issue with the BLE lib - if I leave a mobile phone connected to the BLEServer for about 24h with constant small data exchange e.g. log messages - sometime after closing the app on the mobile phone the BLE server do not issue the void onDisconnect(BLEServer* pServer) callback and I need to restart the device to get the BLE working again as the bleServer->startAdvertising(); // restart advertising is called only after disconnect

[vtomanov]

and if I enable the verbose from time to time the ESP32 restarts with the watchdog triggered from BLE

[V][BLEServer.cpp:271] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [D][BLEDevice.cpp:102] gattServerEventHandler(): gattServerEventHandler [esp_gatt_if: 4] ... Unknown
23:18:53: [V][BLEUtils.cpp:1530] dumpGattServerEvent(): GATT ServerEvent: Unknown
23:18:53: [V][BLEUtils.cpp:1720] dumpGattServerEvent(): dumpGattServerEvent: *** NOT CODED ***
23:18:53: [V][BLEServer.cpp:144] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][BLECharacteristic.cpp:198] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][BLECharacteristic.cpp:452] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [V][BLECharacteristic.cpp:198] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][BLECharacteristic.cpp:452] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [V][BLEServer.cpp:271] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [D][BLEDevice.cpp:102] gattServerEventHandler(): gattServerEventHandler [esp_gatt_if: 4] ... Unknown
23:18:53: [V][BLEUtils.cpp:1530] dumpGattServerEvent(): GATT ServerEvent: Unknown
23:18:53: [V][BLEUtils.cpp:1720] dumpGattServerEvent(): dumpGattServerEvent: *** NOT CODED ***
23:18:53: [V][BLEServer.cpp:144] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][BLECharacteristic.cpp:198] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][FreeRTOS.cpp:143] give(): Semaphore giving: name: ConfEvt (0x3fff6394), owner: <N/A>
23:18:53: [V][BLECharacteristic.cpp:452] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [V][BLECharacteristic.cpp:198] handleGATTServerEvent(): >> handleGATTServerEvent: Unknown
23:18:53: [V][FreeRTOS.cpp:143] give(): Semaphore giving: name: ConfEvt (0x3fff6df4), owner: <N/A>
23:18:53: [V][BLECharacteristic.cpp:452] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [V][BLEServer.cpp:271] handleGATTServerEvent(): << handleGATTServerEvent
23:18:53: [D][BLEDevice.cpp:102] gattServerEventHandler(): gattServerEventHandler [esp_gatt_if: 4] ... Unknown
23:18:53: [V][BLEUtils.cpp:1530] dumpGattServerEvent(): GATT ServerEvent: Unknown
23:18:53: [V][BLEUtils.cpp:1720] dumpGattServerEvent(): dumpGattServerEvent: *** NOT CODED ***
23:18:54: [V][BLESerE (27871) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
23:18:54: E (27871) task_wdt: - IDLE0 (CPU 0)
23:18:54: E (27871) task_wdt: Tasks currently running:
23:18:54: E (27871) task_wdt: CPU 0: Btc_task
23:18:54: E (27871) task_wdt: CPU 1: loopTask
23:18:54: E (27871) task_wdt: Aborting.
23:18:54: abort() was called at PC 0x400f37b3 on core 0
23:18:54: 3ffe6f40 0x400ec60a:0x3ffe6fa0 0x400ea2c9:0x3ffe6ff0 0x4015d069:0x3ffe7030 0x401562e6:0x3ffe7070 0x4008f75d:0x3ffe70a0
23:18:54: Rebooting...
23:18:54: Initialized: SERIAL_LOG64
23:18:56: Ver.#3.20.1238

[chegewara]

Its either in your code or esp-idf bluetooth stack:

23:18:54: E (27871) task_wdt: CPU 0: Btc_task
23:18:54: E (27871) task_wdt: CPU 1: loopTask

EDIT try to decrease log level to info or debug