android - Find other device on local network using the ESP8266 -

how find device on local network? i'm building iot device needs find device connected same network.

there 2 esp8266 modules need communicate each other on local network, how achive this?

using mdns doesn't work router gives generic name.

i thinking storing local ip in database on server seems cumbersome , wouldn't work if failed establish connection.

the devices using esp8266 , interfaced android application.