How to ping a device to make sure its alive

Questions & Help
1

How to ping a device to make sure its alive.

2

Not necessarily ping, but it does what you want: Net Scan App for Homey | Homey

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Let’s start with defining what communication protocol it’s using… :wink:
Zigbee, Z-wave, Bluetooth, 433 MHz, 866 MHz, IR, WiFi ?