ESP32 Forum

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serviceUUID("0000180A-0000-1000-8000-00805f9b34fb");
charUUID("00002A29-0000-1000-8000-00805f9b34fb");

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serviceUUID((uint16_t)0x180A);
charUUID((uint16_t)0x2A29);

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Starting Arduino BLE Client application...
BLE Advertised Device found: Name: SCE8000, Address: d7:ed:14:15:38:03, serviceUUID: 000018ff-5348-494d-414e-4f5f424c4500

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Starting Arduino BLE Client application...
BLE Advertised Device found: Name: SCE8000, Address: d7:ed:14:15:38:03, serviceUUID: 000018ff-5348-494d-414e-4f5f424c4500
Found our device!  address: Forming a connection to d7:ed:14:15:38:03
 - Created client
 - Connected to server
 - Found our service
abort() was called at PC 0x401810d3 on core 1

Backtrace: 0x40090c38:0x3ffd5ab0 0x40090e3b:0x3ffd5ad0 0x401810d3:0x3ffd5af0 0x4018111a:0x3ffd5b10 0x4016ebb3:0x3ffd5b30 0x400d4579:0x3ffd5b50 0x400d1733:0x3ffd5bb0 0x400d1932:0x3ffd5c00 0x40188c90:0x3ffd5c60

Rebooting...

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serviceUUID("0000180A-0000-1000-8000-00805f9b34fb");
charUUID("00002A29-0000-1000-8000-00805f9b34fb");

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serviceUUID((uint16_t)0x180A);
charUUID((uint16_t)0x2A29);

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charUUID((uint16_t)0x2A29);
....
pRemoteCharacteristic = pRemoteService->getCharacteristic(BLEUUID(charUUID));

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Decoding stack results
0x40090c38: invoke_abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/panic.c line 140
0x40090e3b: abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/panic.c line 149
0x401810d3: __cxxabiv1::__terminate(void (*)()) at /builds/idf/crosstool-NG/.build/src/gcc-5.2.0/libstdc++-v3/libsupc++/eh_terminate.cc line 47
0x4018111a: std::terminate() at /builds/idf/crosstool-NG/.build/src/gcc-5.2.0/libstdc++-v3/libsupc++/eh_terminate.cc line 57
0x4016ebb3: __cxxabiv1::__cxa_throw(void*, std::type_info*, void (*)(void*)) at /builds/idf/crosstool-NG/.build/src/gcc-5.2.0/libstdc++-v3/libsupc++/eh_throw.cc line 87
0x400d4579: BLERemoteService::getCharacteristic(BLEUUID) at C:\Users\InfoLabor\Documents\Arduino\hardware\espressif\esp32\libraries\BLE\src\BLERemoteService.cpp line 156
0x400d1733: connectToServer(BLEAddress) at C:\Users\InfoLabor\Documents\Arduino\ESP32\BLE_client_Shimano/BLE_client_Shimano.ino line 51
0x400d1932: loop() at C:\Users\InfoLabor\Documents\Arduino\ESP32\BLE_client_Shimano/BLE_client_Shimano.ino line 114
0x40188c90: loopTask(void*) at C:\Users\InfoLabor\Documents\Arduino\hardware\espressif\esp32\cores\esp32\main.cpp line 17

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// The remote service we wish to connect to.
static BLEUUID serviceUUID("000018ff-5348-494d-414e-4f5f424c4500");
// The characteristic of the remote service we are interested in.
static BLEUUID    charUUID("00002A29-5348-494d-414e-4f5f424c4500");

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/**
 * A BLE client example that is rich in capabilities.
 */

#include "BLEDevice.h"
//#include "BLEScan.h"

// The remote service we wish to connect to.
static BLEUUID serviceUUID("000018ff-5348-494d-414e-4f5f424c4500");
// The characteristic of the remote service we are interested in.
static BLEUUID    charUUID("00002A29-5348-494d-414e-4f5f424c4500");

static BLEAddress *pServerAddress;
static boolean doConnect = false;
static boolean connected = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;

static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {
    Serial.print("Notify callback for characteristic ");
    Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
    Serial.print(" of data length ");
    Serial.println(length);
}

bool connectToServer(BLEAddress pAddress) {
    Serial.print("Forming a connection to ");
    Serial.println(pAddress.toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    Serial.println(" - Created client");

    // Connect to the remove BLE Server.
    pClient->connect(pAddress);
    Serial.println(" - Connected to server");

    // Obtain a reference to the service we are after in the remote BLE server.
    BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(serviceUUID.toString().c_str());
      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());
      return false;
    }
    Serial.println(" - Found our characteristic");

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

    pRemoteCharacteristic->registerForNotify(notifyCallback);
}
/**
 * Scan for BLE servers and find the first one that advertises the service we are looking for.
 */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 /**
   * Called for each advertising BLE server.
   */
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    Serial.print("BLE Advertised Device found: ");
    Serial.println(advertisedDevice.toString().c_str());

    // We have found a device, let us now see if it contains the service we are looking for.
    if (advertisedDevice.haveServiceUUID() && advertisedDevice.getServiceUUID().equals(serviceUUID)) {

      // 
      Serial.print("Found our device!  address: "); 
      advertisedDevice.getScan()->stop();

      pServerAddress = new BLEAddress(advertisedDevice.getAddress());
      doConnect = true;

    } // Found our server
  } // onResult
}; // MyAdvertisedDeviceCallbacks


void setup() {
  Serial.begin(115200);
  Serial.println("Starting Arduino BLE Client application...");
  BLEDevice::init("");

  // Retrieve a Scanner and set the callback we want to use to be informed when we
  // have detected a new device.  Specify that we want active scanning and start the
  // scan to run for 30 seconds.
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true);
  pBLEScan->start(30);
} // End of setup.


// This is the Arduino main loop function.
void loop() {

  // If the flag "doConnect" is true then we have scanned for and found the desired
  // BLE Server with which we wish to connect.  Now we connect to it.  Once we are 
  // connected we set the connected flag to be true.
  if (doConnect == true) {
    if (connectToServer(*pServerAddress)) {
      Serial.println("We are now connected to the BLE Server.");
      connected = true;
    } else {
      Serial.println("We have failed to connect to the server; there is nothin more we will do.");
    }
    doConnect = false;
  }

  // If we are connected to a peer BLE Server, update the characteristic each time we are reached
  // with the current time since boot.
  if (connected) {
    String newValue = "Time since boot: " + String(millis()/1000);
    Serial.println("Setting new characteristic value to \"" + newValue + "\"");
    
    // Set the characteristic's value to be the array of bytes that is actually a string.
    pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
  }
  
  delay(1000); // Delay a second between loops.
} // End of loop