Switching BLE on/off and get additional 29KB into heap

Should we use partition free, or is there a better place ?

Use a 'file' in require("Storage") - so use jsfFindFile. jsfReadFile would be perfect but you can't use it because you won't have any JsVars available :)

bool shouldDisableBLE() {
  JsfFileHeader header;
  uint32_t addr = jsfFindFile(jsfNameFromString(".ble-dis"), &header);
  if (!addr) return false; // no file - default
  char isOn;
  jshFlashRead(&isOn, addr, 1);
  return isOn;
}

Then require("Storage").write(".ble-dis",[1]) would disable it. That could obviously be wrapped up a bit better though :)

Do we need a message during startup, that BLE is disabled ?

I doubt it. If the flag has been set then people will know. I guess BLE functions may need a check & exception in there to ensure they can't be used if BLE hasn't been enabled?

Is there a way to make NRF, Bluetooth and others inactive, so they cannot be called by accident ?

Not easily. You could add a if (!jsBleActive()) return 0 to every function, and then do:

bool bleActive() {
[#ifdef](https://forum.espruino.com/search/?q=%23ifdef) NRF52
  return true;
[#elif](https://forum.espruino.com/search/?q=%23elif) defined(ESP32)
  if (active) {
   return true;
  } else {
   jsExceptionHere(JSET_ERROR,"BLE has been disabled");
   return false;
  }
[#else](https://forum.espruino.com/search/?q=%23else)
  jsExceptionHere(JSET_ERROR,"BLE not implemented");
  return false;
[#endif](https://forum.espruino.com/search/?q=%23endif)
}

Is there an option to use of HWReset ?

http://www.espruino.com/Reference#l_ESP32_reboot ?

what should be default setting, with or without BLE ?

I'd say with BLE. We have the feature, so most people will want to be able to 'just use' it.