1029
Undocumented Commands Found In Bluetooth Chip Manufactured in China Used By a Billion Devices.
(www.tarlogic.com)
This is a most excellent place for technology news and articles.
Esp-home also works with the older esp-01 - it was released as a wifi module so there are only two gpio’s, but thats enough for a lot of home automation stuff.
Here’s one i have connected to HA, where HA uses rest-api to capture some data from a game called tacticus, and it shows my available tokes for guild raid and arena