BLE completely breaks after two cycles BLE.begin->BLE.end

[ASabovic]

Hi guys,

I have already asked this question before but never really received any answer that could help me. I will ask again, is there anyone here that knows how to enable BLE begin -> BLE end cycles? I want to begin BLE when I have data to send, and once it is sent, disconnect the device and end BLE. With the current code, I am able to perform 2 cycles after which my code stops and breaks. Does anyone have the solution for this? I really need this feature as for my experiments the current consumption when BLE is constantly ON is quite high. Thanks in advance!

This is my code:

#include <ArduinoBLE.h>
unsigned long prevNow = 0;

const char* uuidOfBatteryLevelChar = "2d2F88c4-f244-5a80-21f1-ee0224e80658";
const char* uuidOfService = "180F";
const char* nameofPeripheral = "BatteryMonitor";

bool wasConnected = false;
uint32_t genericTimer = 0;

BLEService batteryService(uuidOfService);

BLEUnsignedCharCharacteristic batteryLevelChar(uuidOfBatteryLevelChar, BLEIndicate); 

char prediction_status[] = "";

void setup() {
  Serial.begin(9600);
  while (!Serial);
  initBLE();
}

void blePeripheralConnectHandler(BLEDevice central) {
  Serial.println("Connected event, central: ");
  Serial.println(central.address());
}

void blePeripheralDisconnectHandler(BLEDevice central) {
  Serial.println("Disconnected event, central: ");
  Serial.println(central.address());
}

void loop() {

  BLE.poll();
  long now = millis();
  if (now - prevNow >= 5000) {
    prevNow = now;
    if (BLE.connected()) {
      Serial.println("BLE device is connected!");
      int rssiValue = BLE.rssi();
      Serial.println(rssiValue);
      Serial.println("Connected to central");
      int prediction = 1;
      sprintf(prediction_status, "%d", prediction);
      batteryLevelChar.writeValue(prediction_status[0]);
      BLE.disconnect();
      BLE.end();
      wasConnected=true;
    }
  
    else {
      Serial.println("Not connected to central");
    }
  }

  
  if(wasConnected){
    Serial.println("Central is not connected and must be connected again!");
    genericTimer = millis();
    while(millis() - genericTimer <= 10000){} 
    wasConnected = false;
    Serial.println("I have to initialize BLE again!");
    initBLE();
  }
}


void initBLE(void){
  if (BLE.begin()){
    Serial.println("BLE will begin now!");
  }
  BLE.setLocalName(nameofPeripheral);
  Serial.println("First step is done!");
  BLE.setAdvertisedService(batteryService);
  Serial.println("Second step is done!");
  batteryService.addCharacteristic(batteryLevelChar); // add the battery level characteristic
  Serial.println("Third step is done!");
  BLE.addService(batteryService);
  Serial.println("Fourth step is done!");
  BLE.setEventHandler(BLEConnected, blePeripheralConnectHandler);
  Serial.println("Fifth step is done!");
  BLE.setEventHandler(BLEDisconnected, blePeripheralDisconnectHandler);
  Serial.println("Sixth step is done!");
  Serial.println("Before seventh step and immediately after sixth step!");
  Serial.println("Seventh step is done!");
  BLE.advertise();
}

And after two successful cycles, it stops after the Arduino is again connected to my computer, calling the callback void blePeripheralConnectHandler. This is the output from my serial monitor:

BLE will begin now!
First step is done!
Second step is done!
Third step is done!
Fourth step is done!
Fifth step is done!
Sixth step is done!
Before seventh step and immediately after sixth step!
Seventh step is done!
Not connected to central
Connected event, central: 
3c:6a:a7:42:cc:0e
BLE device is connected!
-37
Connected to central
Central is not connected and must be connected again!
I have to initialize BLE again!
BLE will begin now!
First step is done!
Second step is done!
Third step is done!
Fourth step is done!
Fifth step is done!
Sixth step is done!
Before seventh step and immediately after sixth step!
Seventh step is done!
Not connected to central
Connected event, central: 
3c:6a:a7:42:cc:0e
BLE device is connected!
-41
Connected to central
Central is not connected and must be connected again!
I have to initialize BLE again!
BLE will begin now!
First step is done!
Second step is done!
Third step is done!
Fourth step is done!
Fifth step is done!
Sixth step is done!
Before seventh step and immediately after sixth step!
Seventh step is done!
Not connected to central
Connected event, central: 
3c:6a:a7:42:cc:0e

[per1234]

Hi @ASabovic

I have already asked this question before

Please only open one issue per subject matter. I'll close this as a duplicate of #243. If you have additional information to add, you are welcome to do it in that thread.

If you would like assistance with your project, please post on the Arduino Forum:

https://forum.arduino.cc/