Android emulator for a HW device

I am looking for a mobile app that shall simulate a blynk HW for an android device.
For example, a blynk app press an on/off widjet that send a message to blynk server and this cause a led indication on another smartphone that runs the blynk emulator app.

Hello. You can easily achieve that within Blynk app itself. For that - please consider WebHook widget and Blynk HTTP API.