It looks okay to me, only suggestion I have is to check your PC IP settings opening a command prompt and giove the command ipconfig /all This should should show the default gateway 192.168.140.1 and subnetmask 255.255.225.0 (e.g. /24) If all correct you could run MQTT explorer on your PC and connect to the broker to see if this connection is stable. If yes I see no reason the ctrlX core would not be able to keep this connection other than a faulty RJ45 cable.
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