For ESP8266 Automatically invites your newly flashed Tasmota devices into your WiFi network, by scanning for TASMOTA AP-mode devices and providing them with your SSID and Password. Saves you a couple of minutes per device, no need to use your phone, and no more typos, all for the price of a NodeMCU.
An LED very gently breathes in the background without annoying your peripheral vision, but lights up brightly when a new device is found and invited. If you keep a serial console open, you even get a list of the MAC addresses. Your DHCP server (router) will tell you the IP address of each new device.
By Leif Claesson, released under GPL V3.