Hi guys, did anyone make progress on this topic? Indeed, when adding the "0x1812" service to the peripheral manager I get the exact error as described above. The "Bluetouch" app seems to be using BLE and is somehow managing to offer the 0x1812. It is a little weird though, when I start the app on my iPad and let it be discoverable for 180s, I can not find it while searching for devices on my macbook air. With a windows notebook or my android phone I can find it tough. A BLE Analyzer app shows me that my ipad is offering the 0x1812 service. The app offers a second option, which is to not advertise itself as a peripheral but to search for devices to connect to, I guess it is then working as a central. I then can find my macbook and connect to it, although neither on my mac nor on the iPad (appart from inside the app) it is visible that I am connected, mouse and keyboard funcionality works fine. I will try to sniff everything with PacketLogger and post it here.