Also, in the firmware code, it is possible to issue true access to MYEWWT to other users - just select the "Add user" menu in the settings and specify its ID.
Summing up, we can conclude that such a connection is safe. In order to have unauthorized access to the bot, you will have to gain access to the MYEWWT owner's account, which is quite difficult to do, and with the proper Telegram profile security settings, it is almost impossible.
Inside the home, other devices such as sockets, relays, switches, etc. not connected to Wi-Fi and not connected to the Internet (except for attempts to contact the server to update the firmware once every n hours)
Communication between MYEWWT and other devices is transmitted using ESP-NOW, a data transfer method built into the Espressif SDK. This connection is peer-to-peer, does not require a time-consuming "handshake" and is also provided with the possibility of using the CCMP protocol, the AES-128 algorithm. Communication between devices is established by sending a packet to the MAC address of the device, or using a broadcast.