# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=133

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

**Page:** 134

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## [It's possible catch error from configuration node?](https://discourse.nodered.org/t/its-possible-catch-error-from-configuration-node/20045)

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**Author:** [@VictorStela](https://discourse.nodered.org/u/VictorStela)\
**Replies:** 4\
**Last updated:** [9 February 2024 16:48 UTC](https://discourse.nodered.org/t/its-possible-catch-error-from-configuration-node/20045 "2024-02-09T16:48:51Z")

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Hello, I'm using the pallete node-red-contrib-s7 to collect data from a PLC. The catch and status node don't work properly with this pallete, because the error is caused from the configuration node of the PLC connection…

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## [Rbe is not working as espected](https://discourse.nodered.org/t/rbe-is-not-working-as-espected/85376)

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**Author:** [@ikarisan](https://discourse.nodered.org/u/ikarisan)\
**Replies:** 1\
**Last updated:** [9 February 2024 16:06 UTC](https://discourse.nodered.org/t/rbe-is-not-working-as-espected/85376 "2024-02-09T16:06:37Z")

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Hi! I am struggeling with the rbe node. A ZigBee device is sending periodical status messages with "msg.payload.state" ON or OFF. Sometimes it sends \>5 mesages at once. So I tried to use a rbe to suppress all of these r…

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## [INA219 measurement problem above 16V](https://discourse.nodered.org/t/ina219-measurement-problem-above-16v/85373)

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**Author:** [@noctis-61](https://discourse.nodered.org/u/noctis-61)\
**Replies:** 1\
**Last updated:** [9 February 2024 15:46 UTC](https://discourse.nodered.org/t/ina219-measurement-problem-above-16v/85373 "2024-02-09T15:46:15Z")

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Hello Guys, I have a problem with the voltage measurement in Node-RED with the INA219 flow (node-red-contrib-easybotics-ina219-sensor (node) - Node-RED) The voltage changes when it reaches approx. 16V and goes negativ…

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## [Need help with time function](https://discourse.nodered.org/t/need-help-with-time-function/85368)

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**Author:** [@martin2day](https://discourse.nodered.org/u/martin2day)\
**Replies:** 1\
**Last updated:** [9 February 2024 14:08 UTC](https://discourse.nodered.org/t/need-help-with-time-function/85368 "2024-02-09T14:08:09Z")

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Hello, i want to use node Red to optimize my PV System, my battery charger and my heat pump. For this i have read an function that use the solar forecast of the day and calculate the optimal time where i have to switch…

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## [Uibuilder not loading anything from index.html](https://discourse.nodered.org/t/uibuilder-not-loading-anything-from-index-html/85350)

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**Author:** [@nerevar](https://discourse.nodered.org/u/nerevar)\
**Replies:** 6\
**Last updated:** [9 February 2024 09:41 UTC](https://discourse.nodered.org/t/uibuilder-not-loading-anything-from-index-html/85350 "2024-02-09T09:41:36Z")

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Hello, somehow my uibuilder got crashed yesterday. After I saw the puppeteer sent me unupdated screenshot over telegram I rebooted the system via telegram. According to logs, the system went into several dozen chain r…

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## [Auto disable and enable the deploy](https://discourse.nodered.org/t/auto-disable-and-enable-the-deploy/85355)

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**Author:** [@neyarprasanth1](https://discourse.nodered.org/u/neyarprasanth1)\
**Replies:** 0\
**Last updated:** [9 February 2024 09:35 UTC](https://discourse.nodered.org/t/auto-disable-and-enable-the-deploy/85355 "2024-02-09T09:35:24Z")

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Hello guys, Actually i want to know, if any chance to disable the deply and again enable the deploy in nodered through our flow?????

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## [Change Payload Value in Text](https://discourse.nodered.org/t/change-payload-value-in-text/85347)

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**Author:** [@Stefan8485](https://discourse.nodered.org/u/Stefan8485)\
**Replies:** 7\
**Last updated:** [9 February 2024 08:47 UTC](https://discourse.nodered.org/t/change-payload-value-in-text/85347 "2024-02-09T08:47:39Z")

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Hello, i have noting find in the search. is it possible to change the Payload Value 1 and 0 in a text for sending? in attachment a picture from my test, but the sending is only 0 or 1 i don\`t can change the value. …

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## [Monitor a Rpi/node-red with another Rpi/node-red](https://discourse.nodered.org/t/monitor-a-rpi-node-red-with-another-rpi-node-red/85331)

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**Author:** [@matisok](https://discourse.nodered.org/u/matisok)\
**Replies:** 9\
**Last updated:** [9 February 2024 08:34 UTC](https://discourse.nodered.org/t/monitor-a-rpi-node-red-with-another-rpi-node-red/85331 "2024-02-09T08:34:33Z")

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Hi I am running a node-red install in my ships sump where it serves an important function in taking notice of when the sewage tank is full and then turning on the pump to empty the tank - while letting me know that this…

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## [About blynk nodes in nodered](https://discourse.nodered.org/t/about-blynk-nodes-in-nodered/85349)

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**Author:** [@neyarprasanth1](https://discourse.nodered.org/u/neyarprasanth1)\
**Replies:** 0\
**Last updated:** [9 February 2024 08:20 UTC](https://discourse.nodered.org/t/about-blynk-nodes-in-nodered/85349 "2024-02-09T08:20:00Z")

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Hello,I am using nodered ver v3.1.3. &In my flow i used blynk write node for sent some values. I want to know if any ways there available, if particular virt pin unfortunately disconnected, then how i will know in local …

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## [Function node question](https://discourse.nodered.org/t/function-node-question/85308)

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**Author:** [@EaB11](https://discourse.nodered.org/u/EaB11)\
**Replies:** 3\
**Last updated:** [9 February 2024 06:10 UTC](https://discourse.nodered.org/t/function-node-question/85308 "2024-02-09T06:10:32Z")

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hi all... i have a problem im trying to solve in function node.. i have 4 cameras named "Wide" "Left" "Center" "Right". At any given time one of them is active which is put in a context variable "active".. i want a func…

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## [Error Cannot read properties of undefined (](https://discourse.nodered.org/t/error-cannot-read-properties-of-undefined/85312)

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**Author:** [@Aklex1](https://discourse.nodered.org/u/Aklex1)\
**Replies:** 5\
**Last updated:** [9 February 2024 01:07 UTC](https://discourse.nodered.org/t/error-cannot-read-properties-of-undefined/85312 "2024-02-09T01:07:48Z")

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When loading ipserver:1880, the node placement palette is not available and an error appears "Ошибка добавления потоков Cannot read properties of undefined (reading 'id')" node js 20.11.0 node red 3.1.4 help solve …

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## [In a UI Text Box Node? Can you type in unicode symbols?](https://discourse.nodered.org/t/in-a-ui-text-box-node-can-you-type-in-unicode-symbols/85338)

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**Author:** [@Nodi.Rubrum](https://discourse.nodered.org/u/Nodi.Rubrum)\
**Replies:** 0\
**Last updated:** [8 February 2024 23:28 UTC](https://discourse.nodered.org/t/in-a-ui-text-box-node-can-you-type-in-unicode-symbols/85338 "2024-02-08T23:28:24Z")

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In a UI Text Box Node? Can you type in unicode symbols?

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## [Click Button And File Sent, i.e. Browser Downloading?](https://discourse.nodered.org/t/click-button-and-file-sent-i-e-browser-downloading/85306)

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**Author:** [@Nodi.Rubrum](https://discourse.nodered.org/u/Nodi.Rubrum)\
**Replies:** 7\
**Last updated:** [8 February 2024 21:57 UTC](https://discourse.nodered.org/t/click-button-and-file-sent-i-e-browser-downloading/85306 "2024-02-08T21:57:37Z")

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Click Button And File Sent, i.e. Browser Downloading? Basically doing what NR does when you export a flow... you just select export, set the options for the resulting file, and then the file is downloaded. It is this l…

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## [How can I test for any text received?](https://discourse.nodered.org/t/how-can-i-test-for-any-text-received/85334)

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**Author:** [@questuk](https://discourse.nodered.org/u/questuk)\
**Replies:** 4\
**Last updated:** [8 February 2024 18:51 UTC](https://discourse.nodered.org/t/how-can-i-test-for-any-text-received/85334 "2024-02-08T18:51:02Z")

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Hi, I want to test for any text received in my function, this will then turn on a relay until no text received. I tried below, but does not work. What do I need to put in the if (msg.payload === "") part to match any …

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## [Unable to show labels on bar chart](https://discourse.nodered.org/t/unable-to-show-labels-on-bar-chart/84933)

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**Author:** [@FeliceM](https://discourse.nodered.org/u/FeliceM)\
**Replies:** 4\
**Last updated:** [8 February 2024 18:30 UTC](https://discourse.nodered.org/t/unable-to-show-labels-on-bar-chart/84933 "2024-02-08T18:30:44Z")

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With this function I read data from a txt file. Because there may be more lines of data for the same month, the function will use the last one for each month. // Function to process load shedding data const processLast…

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## [How to calculate diff and sum of dates on Node-RED?](https://discourse.nodered.org/t/how-to-calculate-diff-and-sum-of-dates-on-node-red/85129)

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**Author:** [@ppennachi](https://discourse.nodered.org/u/ppennachi)\
**Replies:** 4\
**Last updated:** [8 February 2024 18:26 UTC](https://discourse.nodered.org/t/how-to-calculate-diff-and-sum-of-dates-on-node-red/85129 "2024-02-08T18:26:03Z")

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Hi guys, how are you? Guys, I need some help. I'm working on an application, where the user enters two dates through two date pickers because I use these dates as parameters to perform a query. The need now arose to c…

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## [Connecting to Cognex 3D Scanner](https://discourse.nodered.org/t/connecting-to-cognex-3d-scanner/85322)

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**Author:** [@ab.ting](https://discourse.nodered.org/u/ab.ting)\
**Replies:** 1\
**Last updated:** [8 February 2024 13:25 UTC](https://discourse.nodered.org/t/connecting-to-cognex-3d-scanner/85322 "2024-02-08T13:25:10Z")

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I am trying to take an output from a Cognex 3D-L4100 scanner and parse it through a Node-RED flow to an HTTP response node. The debug node shows the response output, however the HTTP node shows a "No response object" mes…

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## [Wanting to get involved in "Robotics" any recommendation?](https://discourse.nodered.org/t/wanting-to-get-involved-in-robotics-any-recommendation/85089)

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**Author:** [@damica51](https://discourse.nodered.org/u/damica51)\
**Replies:** 16\
**Last updated:** [8 February 2024 13:18 UTC](https://discourse.nodered.org/t/wanting-to-get-involved-in-robotics-any-recommendation/85089 "2024-02-08T13:18:59Z")

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Can anybody recommend some type of a beginning robitics kit? From what I read it seems theat C++ would be the best language to learn if you are going to program advanced programs, it this correct? Any information will h…

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## [Go to the back folder](https://discourse.nodered.org/t/go-to-the-back-folder/85313)

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**Author:** [@MA.ING](https://discourse.nodered.org/u/MA.ING)\
**Replies:** 6\
**Last updated:** [8 February 2024 11:37 UTC](https://discourse.nodered.org/t/go-to-the-back-folder/85313 "2024-02-08T11:37:25Z")

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Hi, Im trying to go to the back folder but i didnt find the way to do Example, i have "D:\\MA.ING\\NODE\\TEST\\2024" and i want to go one folder back to: "D:\\MA.ING\\NODE\\TEST" I tryed spliting and rejoining but nothing wo…

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## [Serial nodes can be deactivated if not used in a given configuration](https://discourse.nodered.org/t/serial-nodes-can-be-deactivated-if-not-used-in-a-given-configuration/85315)

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**Author:** [@Jean-Luc](https://discourse.nodered.org/u/Jean-Luc)\
**Replies:** 9\
**Last updated:** [8 February 2024 11:15 UTC](https://discourse.nodered.org/t/serial-nodes-can-be-deactivated-if-not-used-in-a-given-configuration/85315 "2024-02-08T11:15:15Z")

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Hello everyone. I have several serial nodes in my flow. Depending on the user's hardware configuration, not all of them are used. I would like to be able to deactivate them, but I understand that NR loads them as soon a…

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## [Help with writing files](https://discourse.nodered.org/t/help-with-writing-files/85314)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 8\
**Last updated:** [8 February 2024 09:27 UTC](https://discourse.nodered.org/t/help-with-writing-files/85314 "2024-02-08T09:27:44Z")

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I have a "config" file that slowly is growing. This is it: {"1":{"number":0},"2":{"number":1},"3":{"number":1},"4":{"number":0},"5":{"number":1},"6":{"number":0},"7":{"number":0},"8":{"number":0},"9":{"number":1},"10":…

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## [Websocket connected and disconnected](https://discourse.nodered.org/t/websocket-connected-and-disconnected/85206)

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**Author:** [@Dr\_Phil](https://discourse.nodered.org/u/Dr_Phil)\
**Replies:** 16\
**Last updated:** [8 February 2024 08:05 UTC](https://discourse.nodered.org/t/websocket-connected-and-disconnected/85206 "2024-02-08T08:05:00Z")

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I'm using Websocket in and out and they work fine. I need to know if a Client is connected or disconnected and whilst this is shown there is no msg available. There is an alternative node: that provides msg.connect…

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## [Stop the execution of a Function for 30 seconds after Event](https://discourse.nodered.org/t/stop-the-execution-of-a-function-for-30-seconds-after-event/85296)

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**Author:** [@Andi](https://discourse.nodered.org/u/Andi)\
**Replies:** 9\
**Last updated:** [8 February 2024 07:31 UTC](https://discourse.nodered.org/t/stop-the-execution-of-a-function-for-30-seconds-after-event/85296 "2024-02-08T07:31:10Z")

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Hi, I have a Flow where I Monitor my pv. The pv Sends it's data every second. If the grid feed is greater than x for 5 seconds, I Set a gpio pin to high. If I buy from the grid for more than 3 seconds the pin gets LOW. …

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## [Unexplained Node-Red Exception](https://discourse.nodered.org/t/unexplained-node-red-exception/85304)

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**Author:** [@innoagg](https://discourse.nodered.org/u/innoagg)\
**Replies:** 2\
**Last updated:** [7 February 2024 22:29 UTC](https://discourse.nodered.org/t/unexplained-node-red-exception/85304 "2024-02-07T22:29:08Z")

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Node-Red will unexpectedly stop with the following log entry: Trace is enabled and no preceding activity coincides with the exception. In other words, the flow is idle before the error occurs. I would expect debug i…

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## ["I don't need to protect my system on the Internet, it isn't valuable" - If you think that, please read](https://discourse.nodered.org/t/i-dont-need-to-protect-my-system-on-the-internet-it-isnt-valuable-if-you-think-that-please-read/85293)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 4\
**Last updated:** [7 February 2024 21:09 UTC](https://discourse.nodered.org/t/i-dont-need-to-protect-my-system-on-the-internet-it-isnt-valuable-if-you-think-that-please-read/85293 "2024-02-07T21:09:13Z")

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Please note this sombre warning from a major security vendor in response to the recent botnet attack that used SMART TOOTHBRUSHES. If a toothbrush can do this, your Node-RED system certainly can. “Every device that is …

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## [Updating to a new version of NR does not work with command](https://discourse.nodered.org/t/updating-to-a-new-version-of-nr-does-not-work-with-command/85298)

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**Author:** [@SuperNinja](https://discourse.nodered.org/u/SuperNinja)\
**Replies:** 2\
**Last updated:** [7 February 2024 18:23 UTC](https://discourse.nodered.org/t/updating-to-a-new-version-of-nr-does-not-work-with-command/85298 "2024-02-07T18:23:40Z")

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I made this topic a while ago: https://discourse.nodered.org/t/edit-displays-if-a-new-node-red-update-is-available-online-and-update-it-from-the-dashboard/30061 to display if a new version of NR was online AND to updat…

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## [Help with pressing a button on a web form (http GET)](https://discourse.nodered.org/t/help-with-pressing-a-button-on-a-web-form-http-get/85130)

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**Author:** [@xyl](https://discourse.nodered.org/u/xyl)\
**Replies:** 4\
**Last updated:** [7 February 2024 16:19 UTC](https://discourse.nodered.org/t/help-with-pressing-a-button-on-a-web-form-http-get/85130 "2024-02-07T16:19:12Z")

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Hello, and thank you for looking! Big Picture I have an ESP8266 connected to my heat pump so I can control it over MQTT. Occasionally, it disconnects from the MQTT server, and the fix is to reboot the device. It serve…

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## [Unable to start node-red after attempted upgrade - Cannot find module 'node:dns'](https://discourse.nodered.org/t/unable-to-start-node-red-after-attempted-upgrade-cannot-find-module-node-dns/85277)

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**Author:** [@Alekeep](https://discourse.nodered.org/u/Alekeep)\
**Replies:** 9\
**Last updated:** [7 February 2024 14:49 UTC](https://discourse.nodered.org/t/unable-to-start-node-red-after-attempted-upgrade-cannot-find-module-node-dns/85277 "2024-02-07T14:49:49Z")

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Starting a new project so figured it would be good to start with the latest release of node-red. Per the nodered.org site, I ran this from the Windows command prompt thinking it would do the trick: npm install -g --unsa…

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## [Blockly help required](https://discourse.nodered.org/t/blockly-help-required/85190)

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**Author:** [@magicman](https://discourse.nodered.org/u/magicman)\
**Replies:** 19\
**Last updated:** [7 February 2024 13:09 UTC](https://discourse.nodered.org/t/blockly-help-required/85190 "2024-02-07T13:09:55Z")

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Hi, I am using blockly for the first time and struggling..i wish to create a statement of.. if msg.stoptimer =" stop" then .......but cannot work out which blockly process to go through. any help would be appreciated t…

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## [Global Var in JSON](https://discourse.nodered.org/t/global-var-in-json/85286)

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**Author:** [@gerand](https://discourse.nodered.org/u/gerand)\
**Replies:** 4\
**Last updated:** [7 February 2024 10:50 UTC](https://discourse.nodered.org/t/global-var-in-json/85286 "2024-02-07T10:50:01Z")

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Hello, I would like to replace the injection nodes with a slider. To do this, I created a global variable “Slider”. How can I replace this with the fixed number 50 in JSON? I wanted to change this: to this: { "…

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