alt Hacker Newsble is just transport layer, if the actual data is encrypted, you can get nothing.
One of our device FW at first transmit raw data through gatt service, then folk at gadget bridge reverse engineer it, which does not sound good to stakeholder, so we have to encrypt the data between phone-device.
Quite possible transport is encrypted, but that can likely be overcome with some RE on the Android app. Given the price of this piece of hardware, it's likely recoverable with moderate effort. At least worth a try.