Hello @smmurarit48
Maybe your device is using the Notify service.
At the moment, Notify method is not supported.
Is it possible for you to update the firmware to use READ instead of the NOTIFY method?
Another user had the same issue and was able to resolve it using this method. For more information, please click here: iOS Bluetooth App doesn’t receives any data - Questions about Thunkable / BLE / BlueTooth - Community