TypeError: Converting circular structure to JSON

General
9

Ok, I think somewhere there must be a http request in your flow and your msg has a .res object. That tuya node is probably cloning (attempting to clone) the whole message but is NOT using the built in cloning routine and therefore falling foul of this fact.

Try setting the function to...

const m = {
  payload: {
    dps: 1,
    set: msg.payload
  }
}
return m

Note: if this works, you should report this to the node author at the link I provided in my first reply.

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