Load value into function

[Pikny]

Hi!
I would like to write a function, when initiated by "PLC start mission", will take the value from "robot_id" and enter it in the appropriate place in the function. Unfortunately, he keeps throwing me an error. Anyone tell me how to correctly load a value into my function?

[jbudd]

Hi @Pikny.

Can you use debug nodes after your Switch and robot_id nodes to show us what's arriving at the Function?

It would be good to see the actual error message you get too.

[fugit185]

Hello, if you want to get help, please, answer questions from forum...

[Pikny]

Hi jbudd.

I apologize for the late response.
I improved my flow.

All the time I have a problem with load number of robot_id in the function node. Robot_id is "undefined".
How I should define this variable correctly?

I will be grateful for your tips and help.

[Pikny]

This is example value model from documentation:

and the values, which I would like to use:

[Steve-Mcl]

Your robot id is in msg.payload not msg.payload.robot_id_int

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Additionally, looking at your flow, I suspect you think these 2 messages will arrive into the function at the same time. They will not! This is a fundamental point to understand if you are to be proficient with node-red.

For this you would need to store the robot ID in context or use a join node.

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to avoid mistakes like these, it would be worth spending a little time learning the basics...

I recommend watching this playlist: Node-RED Essentials. The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.

[Pikny]

Thank you for your activity.
I watched this playlist and I understood some problematic topics.
I solved my problem.

Best regards!