I have also tried to install complete node-red on the remote computer and connected it successfully, (again receiving text strings etc fine) but application wont launch.
this is what i have on the remote computer
Looks like I have wrong idea about the capabilities of MQTTbox.
As it is just a simple client and would not be able to launch any programs or terminal commands.
I was able to achieve the needful by installing full node red on the remote PC as well and thereafter I moved the exec command from the sending PC Node red flow to the Remote PC Node red.
As there is no purpose of exec command in the PC that is sending the message.
So now I just send a message from the publisher (sender PC) to the subscriber (Receiver PC) and once message is received it launches the Application that I want to launch through exec node.
I would still appreciate if some one can advise with some other kind of MQTT client that can launch applications. But basically I am looking for something that is like a small lightweight and reliable client.
Also security is a big concern and I want something that IT department would not object upon.