Most "smart" devices don't need anything beyond attributes, heck, some of them (thermometers and the like) could just fit all the data into a beacon advertiseme

Most "smart" devices don't need anything beyond attributes, heck, some of them (thermometers and the like) could just fit all the data into a beacon advertisement! Manufacturers often do really silly things like encoding all the data into one custom attribute: https://github.com/open-homeautomation/miflora/blob/31e59bdb20dc7262ea5ee2964eeed8753806f420/miflora/miflora_poller.py#L201-L224 https://github.com/open-homeautomation/miflora/blob/31e59bdb... All of this easily could've been done with standardized attributes but fuck interoperability lol. > it cannot do anything else than SNMP-like get/put/trap on some attribute It can do whatever you want. Nobody is forcing you to use ATT, you can speak anything over L2CAP.