I'm writing some code that uses BLE to discover a couple of sensors. I've been able to initialise the BLE library, scan for a device and succesfully match the service UUID with the one I'm interested in. However once I want to do something with services characteristics my M5 crashes with the following error when I call

  std::map<std::string, BLERemoteService*>* servicesMap  = pClient->getServices();         
  for (auto &myServiceEntry : *servicesMap)   
  {
    BLERemoteService* svc = myServiceEntry.second;
    Serial.printf("Service found on Device: %s \n",  svc->getUUID().toString().c_str());

    if (svc->getUUID().toString() == myUUID)
    {   
      Serial.println("Searching for characteruistics");        

      std::map<std::string, BLERemoteCharacteristic*>* characteristics = svc->getCharacteristics();
      
      Serial.println("Finished search");
          
    }        
  }

results in

Finished search
E (9180) FreeRTOS: FreeRTOS Task "loopTask" should not return, Aborting now!

Backtrace: 0x40091e8c:0x3ffcaac0 0x400920bd:0x3ffcaae0 0x4008ddef:0x3ffcab00

Rebooting...

Has anyone used the BLE libraries with the M5? My understanding is the BLE libraries are now part of the ESP32 libraries for arduino and I am currently using ESP21 1.0.2

Thanks