A DTU is needed for this. But there is also an open source project Ahoy -
https://ahoydtu.de/. For this, you need some HW, which is very cheap. You can then access it directly from your mobile or laptop without having to use an additional cloud solution. The two HW components are available quite cheaply. For the connection, however, you have to (be able to) solder on a few pins.) I still have one left.