2.3.4 isn't working with my older bluetooth devices

[societyofrobots]

1.4.3 works on my ~5 year old Fire OS 5.7 tablet, but didn't on my Samsung Galaxy phone.

So upgraded to 2.3.4, and it now works on my Samsung Galaxy, but not my Fire tablet.

nRF Connect crashes during load on my Fire tablet, so using Bluetooth Serial Terminal Android app to scan.

From my Samsung via nRF Connect, my ESP32 says "Advertising type: Legacy", so I assume it's a not legacy related issue. I was mimicking a HID device when using 1.4.3. Maybe related?

Any ideas?

ESP32, core 2.0.17, Arduino-NimBLE 2.3.4.

NimBLEDevice::init("ESP32_UART_BLE");
NimBLEDevice::setSecurityAuth(false, false, false);

pServer = NimBLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());

NimBLEService* pService = pServer->createService(SERVICE_UUID);

NimBLECharacteristic* pRxCharacteristic = pService->createCharacteristic(
    CHARACTERISTIC_UUID_RX,
    NIMBLE_PROPERTY::WRITE | NIMBLE_PROPERTY::WRITE_NR
);
pRxCharacteristic->setCallbacks(new RxCallbacks());

pTxCharacteristic = pService->createCharacteristic(
    CHARACTERISTIC_UUID_TX,
    NIMBLE_PROPERTY::NOTIFY
);

pService->start();

NimBLEAdvertising* pAdvertising = NimBLEDevice::getAdvertising();
pAdvertising->setName("ESP32_UART_BLE");

pAdvertising->addServiceUUID(SERVICE_UUID);

pAdvertising->start();

[h2zero]

Sorry I didn't get to this sooner, your device name is too long if the service UUID is 128bit. The max name length that can fit in the advertisement is 8 characters in this setup.