On which device you think there is a firewall working?
RasPi, Siemens PLC, TXT, Router?
In the 192.168.0.xyz net there is no firewalling, encrypting, authenticating etc.
The RasPi (node-Red app) is acting as a bridge between Siemens PLC (OPC-UA port 4840) and TXT controller (MQTT - port 1883).
OPC UA communication between PLC and RasPi via port 4840 is unrestricted and could be observed with e.g UA-Expert client.
MQTT between Raspi and TXT is also unrestricted. You can use e.g. MQTT-Explorer to see the MQTT traffic.
The communication between TXT and ft-cloud might be secured in some way - this is what I do not know.
Maybe you can describe what is your problem exactly - then someone could provide you with more exact information...
FischerTechnik Simulation Factory 4.0 with Siemens S7-1500
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Re: FischerTechnik Simulation Factory 4.0 with Siemens S7-1500
With MQTT you mix up some things.
MQTT is a communication between clients and a broker and not between devices.
The clients are embedded in the applications.
A client can have a subscriber and/or a publisher relation with a broker.
The broker configuration is responsible for the ports (default 1883) which are used, the security (id/psw's and ACL (for the topics)).
Brokers can be connected with each other by bridges.
MQTT is a communication between clients and a broker and not between devices.
The clients are embedded in the applications.
A client can have a subscriber and/or a publisher relation with a broker.
The broker configuration is responsible for the ports (default 1883) which are used, the security (id/psw's and ACL (for the topics)).
Brokers can be connected with each other by bridges.