ESP32 Forum

Posted: **Sun Dec 18, 2022 8:24 am**

This is my code

Code: [Select all] [Expand/Collapse]

#include "BLEDevice.h"
//#include "BLEScan.h"
 
#define bleServerName "70001697"
// The remote service we wish to connect to.
static BLEUUID serviceUUID("6ECB2400-DC4C-40CC-A6E0-81E0DBDA54E5");
// The characteristic of the remote service we are interested in.
static BLEUUID    charUUID("6ECB2401-DC4C-40CC-A6E0-81E0DBDA54E5");
 
static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;
static BLEAddress *pServerAddress;
 
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);
    Serial.print("data: ");
    Serial.println((char*)pData);
}
 
class MyClientCallback : public BLEClientCallbacks {
  void onConnect(BLEClient* pclient) {
  }
 
  void onDisconnect(BLEClient* pclient) {
    connected = false;
    Serial.println("onDisconnect");
  }
};
 
bool connectToServer() {
    Serial.print("Forming a connection to ");
    Serial.println(myDevice->getAddress().toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    Serial.println(" - Created client");
 
    pClient->setClientCallbacks(new MyClientCallback());
 
    // Connect to the remove BLE Server.
    pClient->connect(myDevice);  // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
    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());
      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);
 
    connected = true;
}
/**
 * Scan for BLE servers and find the first one that advertises the service we are looking for.
 */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());
    if (advertisedDevice.getName() == bleServerName) { //Check if the name of the advertiser matches
      advertisedDevice.getScan()->stop(); //Scan can be stopped, we found what we are looking for
      pServerAddress = new BLEAddress(advertisedDevice.getAddress()); //Address of advertiser is the one we need
      doConnect = true; //Set indicator, stating that we are ready to connect
      Serial.println("Device found. Connecting!");
    }
    else doScan = true;
  }
};
 
 
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 5 seconds.
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setInterval(1349);
  pBLEScan->setWindow(449);
  pBLEScan->setActiveScan(true);
  pBLEScan->start(2, false);
} // 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()) {
      Serial.println("We are now connected to the BLE Server.");
    } 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(doScan)
  {
    BLEDevice::getScan()->start(0);  // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
  }
  
  delay(2000); // Delay a second between loops.
} // End of loop

GeSHi © Codebox Plus Extension

But esp32 constant resets

Code: Select all

15:08:52.749 -> Forming a connection to Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
15:08:52.749 -> Core 1 register dump:
15:08:52.749 -> PC      : 0x40091c74  PS      : 0x00060530  A0      : 0x800d2270  A1      : 0x3ffc87f0  
15:08:52.796 -> A2      : 0x3ffc880a  A3      : 0x00000007  A4      : 0x00000006  A5      : 0x3ffc880a  
15:08:52.796 -> A6      : 0x00060320  A7      : 0x00000000  A8      : 0x800da201  A9      : 0x3ffc87d0  
15:08:52.796 -> A10     : 0x00000018  A11     : 0x3f4001c7  A12     : 0x00000018  A13     : 0x0000ff00  
15:08:52.796 -> A14     : 0x00ff0000  A15     : 0xff000000  SAR     : 0x00000018  EXCCAUSE: 0x0000001c  
15:08:52.796 -> EXCVADDR: 0x00000007  LBEG    : 0x40092ead  LEND    : 0x40092ebd  LCOUNT  : 0xfffffff9  
15:08:52.796 -> 
15:08:52.796 -> ELF file SHA256: 0000000000000000
15:08:52.843 -> 
15:08:52.843 -> Backtrace: 0x40091c74:0x3ffc87f0 0x400d226d:0x3ffc8800 0x400d1a62:0x3ffc8830 0x400d1d66:0x3ffc8880 0x400da7e4:0x3ffc88c0 0x40094ce2:0x3ffc88e0
15:08:52.843 -> 
15:08:52.843 -> Rebooting...

Posted: **Mon Dec 19, 2022 2:04 am**

Can you decode that backtrace? It should lead you to where the crash happens.

ESP32 Forum

BLE client connect device

BLE client connect device

Re: BLE client connect device