Slider node function

what can i do to let the second part of the array that im creating with the function node display the slider value on the "v" part and address the hole of msg to an externale topic like "iotgateway/write"

Messages do not arrive at the same time so you will have to combine them first. Take a look a the batch node, and connect that to a join node, then into a debug node to see what happens or to your function node.

i used the join node first but still have the same problem, now with the fucntion i can see taht the array is already created but i cant have the slider value into "v" parts of the array

You need to combine the messages first.
The join node requires a parts field, which the batch (and split) provides.

Batch + join node.

thanks for your help