GATT question

[sidequestboy]

Hi, I'm looking at this code to try and port similar functionality (interacting with a Pearl scale) to an ESP32 microcontroller.

I see your code doesn't involve any service uuids, but only characteristic uuids. I also notice that the scale does not advertise service uuids, and I am not sure how to subscribe to a characteristic without the corresponding service uuid.

Example arduino code for connecting to a BLE device looks like this:

    BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(serviceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our service");


    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
    if (pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(charUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our characteristic");

    // Read the value of the characteristic.
    if(pRemoteCharacteristic->canRead()) {
      std::string value = pRemoteCharacteristic->readValue();
      Serial.print("The characteristic value was: ");
      Serial.println(value.c_str());
    }

    if(pRemoteCharacteristic->canNotify())
      pRemoteCharacteristic->registerForNotify(notifyCallback);

Do you have any pointers for how to connect without the service uuid here?

thanks for the project