How does this “nodemcu wifi jammer” work
Unlike real jammers, which interrupt the signal of a radio transmitter with its stronger signal, the deauthenticator works at the program level. It implements a denial of service attack by sending a deauthentication frame to the router on behalf of devices connected to the network. Since this frame is not encrypted in any way, it is enough for a stub to find out the MAC addresses of the devices through the network traffic.
Deauthentication is usually part of a complex attack on a network. It is used to create an “evil twin” of the access point or to intercept a handshake, which then allows you to decrypt the password. However, jamming can be useful in and of itself.