Make an ESP8266 an access point with web server.
https://github.com/esp8266/Arduino/blob ... Portal.ino
Web client for ESP8266.
https://github.com/esp8266/Arduino/blob ... Client.ino
The hazy general idea is to have the 4 ESPs/web clients connect to the ESP AP/web server. The Android phone can connect to the ESP AP to get data. Try the other examples because there may be a better way to do what you want.
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