Connection Status from a different Blynk Device

I am trying to use bridge to get temperature data from a different device and i need to work a failsave function for my smart thermostat in case if the remote device gets offline. If the device gets offline, the virtual pin value remains the same and i need to take that in considerationI

How can I check the connection status of a Blynk device using another Blynk device?
They are both ESP8266 if it matters.

I am thinking of generating a random variable number on the monitored device and check it on the master device, make sure it changes in time. Is there a better way of doing it?

Random numbers are not needed… just a simple heartbeat process… Device A sends out a simple alternating 0,1,0,1,0… the ! logical not would work here. And Device B watches for the signal, and if it stops alternating for X amount of time, triggers whatever failsafe code you want.

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Sounds good, thanks!