# Latest

**URL:** https://discourse.nodered.org/latest.md?page=726

[Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md)

**Page:** 727

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## [Building an ioT app with Apache Kafka + MQTT](https://discourse.nodered.org/t/building-an-iot-app-with-apache-kafka-mqtt/51578)

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**Author:** [@kikocosta22](https://discourse.nodered.org/u/kikocosta22)\
**Replies:** 4\
**Last updated:** [27 September 2021 20:56 UTC](https://discourse.nodered.org/t/building-an-iot-app-with-apache-kafka-mqtt/51578 "2021-09-27T20:56:17Z")

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Hello there, I would like some insights about the solution I am now implementing. My team is building an ioT app that monitors a certain industrial process. Our goal is to represent and show ioT information about sensor…

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## [Serial request - node is giving data only once after deploy and giving time out on triggering / interval](https://discourse.nodered.org/t/serial-request-node-is-giving-data-only-once-after-deploy-and-giving-time-out-on-triggering-interval/51568)

<div class="topic-metadata">

**Author:** [@SS-Akhilesh-Appala](https://discourse.nodered.org/u/SS-Akhilesh-Appala)\
**Replies:** 1\
**Last updated:** [27 September 2021 20:54 UTC](https://discourse.nodered.org/t/serial-request-node-is-giving-data-only-once-after-deploy-and-giving-time-out-on-triggering-interval/51568 "2021-09-27T20:54:13Z")

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HI I am facing this issue with one of the serial instruments when I am deploying the flow I am getting the data instantly -\> as seen in timestamp node with injecting after 0.1 secs but after that whenever I trigger o…

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## [\[ANNOUNCE\] node-red-contrib-sony-audio 1.8](https://discourse.nodered.org/t/announce-node-red-contrib-sony-audio-1-8/51590)

<div class="topic-metadata">

**Author:** [@jens\_rossbach](https://discourse.nodered.org/u/jens_rossbach)\
**Replies:** 0\
**Last updated:** [27 September 2021 19:57 UTC](https://discourse.nodered.org/t/announce-node-red-contrib-sony-audio-1-8/51590 "2021-09-27T19:57:26Z")

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Today I released version 1.8 of the node-red-contrib-sony-audio node collection. For further information, see announcement n GitHub: node-red-contrib-sony-audio 1.8

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## [Maximum Number of serial connections?](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586)

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**Author:** [@MonsieurBricolage](https://discourse.nodered.org/u/MonsieurBricolage)\
**Replies:** 1\
**Last updated:** [27 September 2021 19:12 UTC](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586 "2021-09-27T19:12:37Z")

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I am trying to connect around 20 Arduinos via USB, interfacing Node-RED through Serial. I will extend the USB 2.0 range through Usb to Ethernet range extenders. How many Serial USB connections does Node-RED allow? Or is…

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## [Multiple Input interfering PID controller?](https://discourse.nodered.org/t/multiple-input-interfering-pid-controller/51454)

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**Author:** [@Marth](https://discourse.nodered.org/u/Marth)\
**Replies:** 8\
**Last updated:** [27 September 2021 18:57 UTC](https://discourse.nodered.org/t/multiple-input-interfering-pid-controller/51454 "2021-09-27T18:57:38Z")

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The node-red-contrib-pid appears to only have 1 input, and potentially multiple ouputs. There's an example of an output of a Heater and a Cooler being used to control the input of Temperature. I'm wondering if anyone ha…

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## [Safari browser support](https://discourse.nodered.org/t/safari-browser-support/51571)

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**Author:** [@GammaKappa](https://discourse.nodered.org/u/GammaKappa)\
**Replies:** 5\
**Last updated:** [27 September 2021 18:09 UTC](https://discourse.nodered.org/t/safari-browser-support/51571 "2021-09-27T18:09:43Z")

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I was hoping to use my old iPad running IOS 9.3.5 (no more updates :slightly\_frowning\_face:) to display my Node-RED dashboards. Unfortunately Safari only displays a blank white screen. Is there any way to display the d…

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## [Handling split/join node logic when "losing" split msgs is expected](https://discourse.nodered.org/t/handling-split-join-node-logic-when-losing-split-msgs-is-expected/51362)

<div class="topic-metadata">

**Author:** [@utmostGrandPoobah](https://discourse.nodered.org/u/utmostGrandPoobah)\
**Replies:** 5\
**Last updated:** [27 September 2021 17:57 UTC](https://discourse.nodered.org/t/handling-split-join-node-logic-when-losing-split-msgs-is-expected/51362 "2021-09-27T17:57:05Z")

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Use-case: I am split'ing an array of recordIds to make sequential API requests (YouTube endpoint) and then evaluating the JSON responses, specifically determining if an array has any items in it. If the array is empty, t…

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## ["Is a CMS built using Node-red even a good idea?"](https://discourse.nodered.org/t/is-a-cms-built-using-node-red-even-a-good-idea/49497)

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**Author:** [@mrSidX](https://discourse.nodered.org/u/mrSidX)\
**Replies:** 3\
**Last updated:** [27 September 2021 11:16 UTC](https://discourse.nodered.org/t/is-a-cms-built-using-node-red-even-a-good-idea/49497 "2021-09-27T11:16:57Z")

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I'm not here to bash on CMS platforms like WP cough, But I'd really like to have a seamless solution to implement in my node-red server: I understand the term CMS is fairly broad, so I'll refine the question to a simi…

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## [How can I allineate sliders?](https://discourse.nodered.org/t/how-can-i-allineate-sliders/51238)

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**Author:** [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)\
**Replies:** 11\
**Last updated:** [27 September 2021 08:13 UTC](https://discourse.nodered.org/t/how-can-i-allineate-sliders/51238 "2021-09-27T08:13:11Z")

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Hi, I've different names which differs for lenght.. I tried to insert spaces to move the beginning of the cursor right as the logest name does, but they are ignored. I don't want to use \_\_ for example, there is any invis…

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## [How to Uninstall Node-Red-contrib-ui-i](https://discourse.nodered.org/t/how-to-uninstall-node-red-contrib-ui-i/51544)

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**Author:** [@tcontrada](https://discourse.nodered.org/u/tcontrada)\
**Replies:** 8\
**Last updated:** [27 September 2021 06:23 UTC](https://discourse.nodered.org/t/how-to-uninstall-node-red-contrib-ui-i/51544 "2021-09-27T06:23:12Z")

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I'm running NR version 1.3.4 and NJS version 10.24.0 on a RPI 400. The NR dashboard that is installed is an old dashboard version "node-red-contrib-ui-i" and I want to replace it with the newer NR dashboard. The issue …

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## [Why all wires of node in node.wires\[0\]?](https://discourse.nodered.org/t/why-all-wires-of-node-in-node-wires-0/51555)

<div class="topic-metadata">

**Author:** [@Roman](https://discourse.nodered.org/u/Roman)\
**Replies:** 1\
**Last updated:** [27 September 2021 05:46 UTC](https://discourse.nodered.org/t/why-all-wires-of-node-in-node-wires-0/51555 "2021-09-27T05:46:33Z")

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Are there some circumstances to have array of arrays of wires? In which cases wires can be in node.wires\[i\], where i\>0?

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## [I am trying to program a traffic light that is powered by OPC UA Data](https://discourse.nodered.org/t/i-am-trying-to-program-a-traffic-light-that-is-powered-by-opc-ua-data/50207)

<div class="topic-metadata">

**Author:** [@idk](https://discourse.nodered.org/u/idk)\
**Replies:** 6\
**Last updated:** [26 September 2021 21:20 UTC](https://discourse.nodered.org/t/i-am-trying-to-program-a-traffic-light-that-is-powered-by-opc-ua-data/50207 "2021-09-26T21:20:43Z")

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Good day dear forum. I am trying to display OPC UA data as a traffic light, but I am not getting anywhere. My first try was to create a bulb that changes color with the ng-if statement via a set msg.payload. This works…

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## [Http file download cause dashboard connection lost](https://discourse.nodered.org/t/http-file-download-cause-dashboard-connection-lost/51523)

<div class="topic-metadata">

**Author:** [@davidz](https://discourse.nodered.org/u/davidz)\
**Replies:** 4\
**Last updated:** [26 September 2021 19:20 UTC](https://discourse.nodered.org/t/http-file-download-cause-dashboard-connection-lost/51523 "2021-09-26T19:20:22Z")

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Did anybody have the similar issue? When download a file via http with the new dashboard version 3.0.4, it will cause an error of "connection lost". The connection will be lost for a few seconds and then it is back to no…

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## [How to increase the X and Y limits of node-red](https://discourse.nodered.org/t/how-to-increase-the-x-and-y-limits-of-node-red/51543)

<div class="topic-metadata">

**Author:** [@beneditomarques](https://discourse.nodered.org/u/beneditomarques)\
**Replies:** 2\
**Last updated:** [26 September 2021 17:51 UTC](https://discourse.nodered.org/t/how-to-increase-the-x-and-y-limits-of-node-red/51543 "2021-09-26T17:51:36Z")

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Hello, I have an flow (in an flow chart tool) that have so much components (nodes). While trying put this nodes in node-red, I've seen that the width is not suficient to acomodate the entire flow, what let me doing the f…

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## [Spinner input field width](https://discourse.nodered.org/t/spinner-input-field-width/51533)

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**Author:** [@jens\_rossbach](https://discourse.nodered.org/u/jens_rossbach)\
**Replies:** 0\
**Last updated:** [26 September 2021 12:16 UTC](https://discourse.nodered.org/t/spinner-input-field-width/51533 "2021-09-26T12:16:24Z")

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Hello, in the current version of Node-RED with default theme, the width of a spinner input field on node's configuration pages cannot be set anymore via CSS properties. This worked in the past (I don't know with which e…

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## [Debian - use gpio](https://discourse.nodered.org/t/debian-use-gpio/51527)

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**Author:** [@sdalee](https://discourse.nodered.org/u/sdalee)\
**Replies:** 7\
**Last updated:** [26 September 2021 12:12 UTC](https://discourse.nodered.org/t/debian-use-gpio/51527 "2021-09-26T12:12:57Z")

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HI, I installed debian 11 some days ago for Rpi 4, but I can't use GPIO. I installed 'node-red-node-pi-gpio' add-on. I'd like to use input, but the message doesn't come when I change the state of GPIO input. Under raspb…

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## [Allowing user to edit a list variable of a custom node](https://discourse.nodered.org/t/allowing-user-to-edit-a-list-variable-of-a-custom-node/51524)

<div class="topic-metadata">

**Author:** [@kakyoism](https://discourse.nodered.org/u/kakyoism)\
**Replies:** 1\
**Last updated:** [26 September 2021 07:25 UTC](https://discourse.nodered.org/t/allowing-user-to-edit-a-list-variable-of-a-custom-node/51524 "2021-09-26T07:25:49Z")

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I've been able to specify node configuration UI using the standard input HTML elements, but when it comes to a variable that is a list itself, what is a standard way of building its node-config UI? For example, through…

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## [Converting hex to decimal](https://discourse.nodered.org/t/converting-hex-to-decimal/49580)

<div class="topic-metadata">

**Author:** [@dick](https://discourse.nodered.org/u/dick)\
**Replies:** 29\
**Last updated:** [26 September 2021 07:02 UTC](https://discourse.nodered.org/t/converting-hex-to-decimal/49580 "2021-09-26T07:02:19Z")

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Hello, for you perhaps something stupids, but for me a problem Ho do i get decimal data from (wx)sensors TEMP;'00f6' ; HUM;'62'; Dick

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## [How to detect change in a flow or global variable](https://discourse.nodered.org/t/how-to-detect-change-in-a-flow-or-global-variable/5454)

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**Author:** [@drmibell](https://discourse.nodered.org/u/drmibell)\
**Replies:** 25\
**Last updated:** [29 May 2020 22:57 UTC](https://discourse.nodered.org/t/how-to-detect-change-in-a-flow-or-global-variable/5454 "2020-05-29T22:57:49Z")

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Is it possible for a custom node to react immediately to a change in a flow/global variable? Is there an event emitted when a function node executes something like global.set("global","value") or when a change node modif…

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## [Looking for a text](https://discourse.nodered.org/t/looking-for-a-text/51525)

<div class="topic-metadata">

**Author:** [@mversion](https://discourse.nodered.org/u/mversion)\
**Replies:** 6\
**Last updated:** [26 September 2021 05:44 UTC](https://discourse.nodered.org/t/looking-for-a-text/51525 "2021-09-26T05:44:01Z")

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I know it is something really basic that I'm missing here. So I am getting Pushbullet notifications from my phone to NodeRed. I'm looking for any particular notification with a msg.payload that contains a specific set of…

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## [Duplicate tabs in editor](https://discourse.nodered.org/t/duplicate-tabs-in-editor/51471)

<div class="topic-metadata">

**Author:** [@hotNipi](https://discourse.nodered.org/u/hotNipi)\
**Replies:** 4\
**Last updated:** [26 September 2021 02:37 UTC](https://discourse.nodered.org/t/duplicate-tabs-in-editor/51471 "2021-09-26T02:37:48Z")

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\[moved to new topic since the other topic was three years old\] I have created only one TAB but, upon reopening the editor i see duplicated tab, i tried to delete one, both were deleted. what is wrong here?

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## [Rocker Switch HTML CSS output question](https://discourse.nodered.org/t/rocker-switch-html-css-output-question/51514)

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**Author:** [@shel](https://discourse.nodered.org/u/shel)\
**Replies:** 5\
**Last updated:** [25 September 2021 21:41 UTC](https://discourse.nodered.org/t/rocker-switch-html-css-output-question/51514 "2021-09-25T21:41:51Z")

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Trying to stretch my HTML CSS wings and found a rocker switch I'd like to incorporate in a flow. Problem is I can't get any out put of the switch. Hours of googling has not helped so in desperation if there is a CSS wiza…

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## [Send data from s7 to mysql](https://discourse.nodered.org/t/send-data-from-s7-to-mysql/51310)

<div class="topic-metadata">

**Author:** [@hederson2801](https://discourse.nodered.org/u/hederson2801)\
**Replies:** 11\
**Last updated:** [25 September 2021 21:10 UTC](https://discourse.nodered.org/t/send-data-from-s7-to-mysql/51310 "2021-09-25T21:10:08Z")

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Hello my friends. I am working with mysql and s7. I was able to communicate and write values ​​in my database. I'm not able to write the data I get from the PLC to mysql. I would like to save every two minutes of the dic…

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## [LAN shared folders in Android](https://discourse.nodered.org/t/lan-shared-folders-in-android/51475)

<div class="topic-metadata">

**Author:** [@RafaelMarquesRibeiro](https://discourse.nodered.org/u/RafaelMarquesRibeiro)\
**Replies:** 7\
**Last updated:** [25 September 2021 20:58 UTC](https://discourse.nodered.org/t/lan-shared-folders-in-android/51475 "2021-09-25T20:58:20Z")

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Hi! Im developing a node-red flow where it needs to acess another computer folder with a network connection. In windows it works perfectly i just need to put the right directory (//PCNAME/etc). I've installed "Total Comm…

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## [Connect the dashbord to a domain via apache](https://discourse.nodered.org/t/connect-the-dashbord-to-a-domain-via-apache/51519)

<div class="topic-metadata">

**Author:** [@jerome](https://discourse.nodered.org/u/jerome)\
**Replies:** 0\
**Last updated:** [25 September 2021 20:08 UTC](https://discourse.nodered.org/t/connect-the-dashbord-to-a-domain-via-apache/51519 "2021-09-25T20:08:46Z")

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hello i want to connect my dasbord to an 'ionos' domain name via apache in ionos i can only put a dns and not a gateway. how can I do ? my DNS points to an html index.html page this one can be replaced by a site but I do…

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## [Automate a huge volume of GET requests](https://discourse.nodered.org/t/automate-a-huge-volume-of-get-requests/51509)

<div class="topic-metadata">

**Author:** [@humphrysr](https://discourse.nodered.org/u/humphrysr)\
**Replies:** 17\
**Last updated:** [25 September 2021 20:07 UTC](https://discourse.nodered.org/t/automate-a-huge-volume-of-get-requests/51509 "2021-09-25T20:07:19Z")

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I have a SQL Server table with 115,000+ last names and first name and some other identifiers. I need to make GET requests against a REST endpoint, using these data and store the json response for parsing. Can I use NR …

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## [Go to an html page with a node](https://discourse.nodered.org/t/go-to-an-html-page-with-a-node/51449)

<div class="topic-metadata">

**Author:** [@jerome](https://discourse.nodered.org/u/jerome)\
**Replies:** 2\
**Last updated:** [25 September 2021 19:42 UTC](https://discourse.nodered.org/t/go-to-an-html-page-with-a-node/51449 "2021-09-25T19:42:07Z")

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hello I use a users loging and I want this one after being valid to send me back to the dashbord, I can't find a way to do it can you help me?

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## [Nrlint eslint:recommended rules not applied](https://discourse.nodered.org/t/nrlint-eslint-recommended-rules-not-applied/51502)

<div class="topic-metadata">

**Author:** [@a\_grunt](https://discourse.nodered.org/u/a_grunt)\
**Replies:** 2\
**Last updated:** [25 September 2021 19:40 UTC](https://discourse.nodered.org/t/nrlint-eslint-recommended-rules-not-applied/51502 "2021-09-25T19:40:42Z")

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Hi everyone! I am trying to check my function nodes code with function-eslint rule in nrlint. nrlint version - 1.0.2 node-red version - 2.0.6 NodeJS version - 14.17.3 The function-eslint rule configuration is defaul…

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## [Text node doesn't show empty spaces (if generated by a function)](https://discourse.nodered.org/t/text-node-doesnt-show-empty-spaces-if-generated-by-a-function/51262)

<div class="topic-metadata">

**Author:** [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)\
**Replies:** 3\
**Last updated:** [25 September 2021 17:16 UTC](https://discourse.nodered.org/t/text-node-doesnt-show-empty-spaces-if-generated-by-a-function/51262 "2021-09-25T17:16:50Z")

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Hi, that's strange, if I inject a string with spaces they are correctly displayed, if I use a function it doesn't show the space, please consider this flow: \[{"id":"d906ef38.9de2c","type":"ui\_text","z":"cc2c1666.3d904",…

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## [Best way to set up some context on boot](https://discourse.nodered.org/t/best-way-to-set-up-some-context-on-boot/51507)

<div class="topic-metadata">

**Author:** [@Calendil](https://discourse.nodered.org/u/Calendil)\
**Replies:** 2\
**Last updated:** [25 September 2021 14:40 UTC](https://discourse.nodered.org/t/best-way-to-set-up-some-context-on-boot/51507 "2021-09-25T14:40:58Z")

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Hello all, I would like my set up some context at the beginning of a boot. \[start-up-trigger\] -----\[change\] Is this the best way to do it?

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