Memory leakage in getting manufacture data and the fix.

[l8l8l]

BLE Scan runs out of memory when processing manufacture data, 'freemem' reduced very quickly and leads frequent crash.

---------ZgatewayBT.ino-------------

  if (advertisedDevice.haveManufacturerData()) {
    char* manufacturerdata = BLEUtils::buildHexData(NULL, (uint8_t*)advertisedDevice.getManufacturerData().data(), advertisedDevice.getManufacturerData().length());
    Log.trace(F("Manufacturer Data: %s" CR), manufacturerdata);
    BLEdata.set("manufacturerdata", manufacturerdata);
    free(manufacturerdata); **<-  Add the pointer free here.**
  }

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Tested with default_envs = esp32dev-ble, pubUnknownBLEServiceData, pubBLEManufacturerData, pubBLEServiceUUID are enabled to scan BLE Beacons. freemem stays at 50KB.

[1technophile]

Thanks for pointing that

[jmw6773]

@l8l8l , great find. This seems to have resolved the random crashing I was seeing on my ESP32 device.