ESP8266 WeMos D1 Mini WIFI REPEATER/RANGE EXTENDER
Using an WeMos D1 Mini as a cheap WIFI range extender
The WeMos D1 mini is very cheap about £3 - £5 depending on the quantity purchased.
This is the only component apart from a power source that is required.
There are 4 stages to get the WIFI repeater working.
1-Download the ESP8266 Flash Download tool for windows from the official website.
2-Download the ESP WIFI Repeater software.
3-Upload the ESP WIFI Software to the ESP8266 using the Flash Download Tool.
4-Setup the repeater using a mobile or other WIFI device.
Brett site not complete see site https://circuitdigest.com/microcontroller-projects/nodemcu-esp8266-wifi-repeater-or-range-extender
site copied below for now