I have got one technical question. Please see picture TUNNEL.pdf
I have got installed TRB140 (I.). There is port forwarding realized so any PC on internet can access our web server typing 126.96.36.199:40000 to the address row.
Could I add second TRB140 device and parallelly create connection ( some secure tunnel) to be able the PC with web server ask the PLC for data?
Web server can ask only devices that’s looks they are on same LAN.
What is the best way to solve this.
Could I use second SIM card with standard IP address?
What kind of secure tunnel to create? Open VPN ?
Can both process ( port forward and secure tunnel) works together on TRB140 device?
Thank you for answers.