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Questions tagged [node-red]

Node-RED is a data-flow programming tool for wiring together hardware devices, APIs and online services in new and interesting ways.

Node-RED provides a browser-based flow editor to wire together flows using the wide range of nodes in the palette. A built-in library allows you to save useful functions, templates or flows for re-use.

The light-weight runtime is built on Node.js, and utilizes its event-driven, non-blocking model. This makes it ideal to run at the edge of the network on low-cost hardware such as the Raspberry Pi as well as in the cloud.

Problems that may require back and forth debugging may be better asked on the mailing list.

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2181 questions
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writing 8 bit data to file, without escape character

I am using NODERED to read a serial port. The data coming in is 8 bit per byte. reading is working fine. Now, I want to write that buffer to a file. When I use buffer.toString() it generates a string but with formatting. Even the 'binary' option…
Roozeboos
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How can I Upload .doc type files by document-uploader-node to Discovery service?

In Node-RED, it has "Document uploder node", which sounds can upload file to Discovery Service, but, the problem is my client want to upload .doc file. Of course I tried, but Discovery service side treat the payload as json and cannot got expected…
I.fuji
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Node-Red UI Template: how to "fix" a value for a variable?

After many tries and hours of research in the Internet (ok, I am new to HTML/Javascript), I manage to code the Node-Red UI-Dashboard template below in a way that, when different values of msg.payload are sent, the HTML is updated and a the value of…
Eduardo
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How to Login on a website programmatically

I want to programmatically log in to a website (https://www.vipmobile.rs/mojvip) By now, the only way I figured out to input my credentials is by adding value="abcd@abc.com" on input tags trought inspect element on google chrome. Does anyone know…
Nemanja
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Node Red UI not showing while on reverse proxy nginx

I currently have a setup of node-red running on raspberry pi stretch. the node-red doesnt have any problem when running local. The raspberry pi is behind a nginx reverse proxy server. whenever being accessed on my domain, flow doesnt show up even…
Rae Villena
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Node Red - flows stopped due to missing nodes error on startup

My node red flows were working fine but when I restarted them, they started giving me this error. Nothing has changed between the time it worked and now. Any clue what the error could be? I already checked configuration nodes tab for missing nodes…
Georgeena Thomas
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Why in node-red my HTTP POST no receive payload from inject?

i try use https://rpinotify.it/invio-di-testo.html i want send message with http post but i can't, see images i use Node-Red to fred.sensetecnic, i try use json, strings... i can't undestrand, can you help me? 3/7/2018, 08:43:15node:…
Enrico Sartori
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Node-Red Multiple Contexts

I have a Node-Red Application. A user logs in with credentials stored in a sqlite database. Based on the information returned from the database it sets a bunch of variables for use in other flows. flow.set('sid',…
Smithy
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Node-red hangs when sending fast node.send(msg)

I am struggling with a problem in a node configuration for node-red. I have made a node, which have an input and an output. Every time the input is getting a payload message of any type, it performs a reading of a file, and throw that content out on…
Simon
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How to add a comma to payload message?

This may be an easy problem to fix in node red. I receive a payload from my temperature sensor: 230 and i need to change it to 23.0 How can I in node red add a comma so the value changes from 230 to 23,0 Kind regards
Andreas Hauser
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Nodejs fs.createReadStream event error

I am trying to read data from a file very quickly (data from an ADC). The conversion is started on opening the file, and finished at close. I need to wait opening the file again, and wait for the currently conversion to complete. My problem is, that…
Simon
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'Undefined' Exception in using external npm module in node-red with global context

I am trying to use a npm module in node-red, after doing some research I came accross the use of global context and so I did the following: Added a require in setting.js file of my node-red directory like so: functionGlobalContext: {…
Akheloes
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Node-Red Multiple outputs into CSV

I have multiple Modbus variables that I am trying to store on my local disk. My function script is as follows: var msgPortBus,msgStbdBus; if (msg.topic === 'BusVolts') { msgPortBus = { payload: msg.payload.Port.Bus.Volts, }; msgStbdBus = {…
Infernez
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Custom palette in embedded node-red not imported

I need to embed Node-red in express, I've used this guide and it works. Unfortunately, I can't import custom nodes. I try to import all dependencies in "package.json" of express as suggested in the guide, but it doesn't works. If I start only…
Gianluca Petralia
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Heroku is reseting the node-red app data

I'm developing an college project to read data from an sensor remotely. I made an application with node-red to be served by Heroku. It has runned perfectly but from times to times the "flow" goes away and the aplication resets the SENSOR DATA. So…
Henrique
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