We would like to use a RUT300 router to access PLC(Omron NX1P2) and HMI(Kinco-GL100E) of our machines.
I set the router and our devices as i show you below via link.
It seems that your LAN and RMS Hub networks are identical (192.168.250.0/24). Those need to be different. Change the LAN network (on RUT300 and end devices) to something different, like 192.168.200.0/24.
Then, in RMS VPN Hub settings make sure that LAN forwarding is enabled:
And add a route manually to 192.168.200.0255.255.255.0 via device RUT300.