System Alive Checker (Ping) ping in other subnet

[brandsrus]

I use Domoticz and with the hardware System Alive Checker (Ping).

But my Raspberry PI have a different subnet then the devices where a will ping.

My Raspberry PI have an IP adress equal to 192.168.178.xxx and the devices what i will ping have ip adresses of 192.168.68.xxx.

This is difference because I use a mesh network with Deco for the perfect wifi environment here.

How can i ping to devices in an other range of IP-adresses? Is this a setting in Domoticz of in the RPI?

[jvdz]

Is it fair to assume that the Deco is a Nat Router and that the 2 subnet's aren't routable at all? ( Meaning you can not connect from the Main Network to any device in the WiFI network but the reverse is working?)
I think you should configure your Deco Wifi network as AccessPoints using the same IP Subnet ( If that is an option in the Device) because else you will have a hard time connection from any device in the WiFi Deco network to any Device in the Main Network.