Weird Function Output

[oncdastan]

@zenofmud

the first time the flow runs, the trigger node sends the contents of global.ktop but if it doesn't exist, then msg.payload will not exist and a msg is sent to the function node with no msg.payload.

I put a 5 second delay between inject and trigger. It works fine now.

@zenofmud

In the function node, you have var htop which creates the variable with nothing in it. You then write that value to the global.htop

I put the following line above the return line:

global.set('ktop',ktop);

@zenofmud

What will happen if any or all of global.k1, global.k2 or global.k3 doesn't exist?

I think my last reply is the answer to this. If I remove ground or signal wire, it sends a message with no payload. This is the same thing with the original problem I had. So, maybe it is related to wiring issues, since I am working with a breadboard. When I remove power, it reads 85 degrees (C).

[zenofmud]

So why not add a switch node to see if msg.payload exists? If it does, send it on, if it doesn't then drop it.