# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=204

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

**Page:** 205

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## [Old Ipad2 and Node-red dashbooard](https://discourse.nodered.org/t/old-ipad2-and-node-red-dashbooard/78934)

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**Author:** [@Spectre68](https://discourse.nodered.org/u/Spectre68)\
**Replies:** 9\
**Last updated:** [5 June 2023 13:48 UTC](https://discourse.nodered.org/t/old-ipad2-and-node-red-dashbooard/78934 "2023-06-05T13:48:48Z")

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Hi! I have an old Ipad2 still working, I wanted to try to use it as an interface for node-red-dashbooard, but when I type the server address the page remains blank. I also tried to install Dolphin as browser but same pr…

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## [Node-red-contrib-knx-easy](https://discourse.nodered.org/t/node-red-contrib-knx-easy/78959)

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**Author:** [@Timi](https://discourse.nodered.org/u/Timi)\
**Replies:** 1\
**Last updated:** [5 June 2023 13:17 UTC](https://discourse.nodered.org/t/node-red-contrib-knx-easy/78959 "2023-06-05T13:17:22Z")

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Hello, I ran into a issue with the connection of my Knx installation and my Nodered. I´m running Nodered local in a Milesight Gateway. My problem is when I´m using KNX easy node my connection, disconnects. I have to d…

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## [State engine as a subflow](https://discourse.nodered.org/t/state-engine-as-a-subflow/78951)

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**Author:** [@joachimstrom](https://discourse.nodered.org/u/joachimstrom)\
**Replies:** 6\
**Last updated:** [5 June 2023 11:36 UTC](https://discourse.nodered.org/t/state-engine-as-a-subflow/78951 "2023-06-05T11:36:24Z")

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Hi. Is it possible to build a state engine as a subflow? I want to be able to pass a numeric value (1-10) and based on that there is 3 different status variables that can change. 1 of the variables is dependant of the …

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## [Problem Maximum call stack size exceeded using node-red-contrib-aedes](https://discourse.nodered.org/t/problem-maximum-call-stack-size-exceeded-using-node-red-contrib-aedes/78868)

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**Author:** [@carflomi](https://discourse.nodered.org/u/carflomi)\
**Replies:** 6\
**Last updated:** [5 June 2023 11:21 UTC](https://discourse.nodered.org/t/problem-maximum-call-stack-size-exceeded-using-node-red-contrib-aedes/78868 "2023-06-05T11:21:02Z")

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Hello. I am using node-red to implement a MQTT broquer (node-red-contrib-aedes) and node-red its working in a Docker, Everything is working correctly but, I detect the following error 1 Jun 15:05:59 - \[red\] Uncaught Ex…

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## [Port number of running node-red instance](https://discourse.nodered.org/t/port-number-of-running-node-red-instance/20166)

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**Author:** [@Meng](https://discourse.nodered.org/u/Meng)\
**Replies:** 20\
**Last updated:** [5 June 2023 08:46 UTC](https://discourse.nodered.org/t/port-number-of-running-node-red-instance/20166 "2023-06-05T08:46:03Z")

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How can i get the portnumber of the current node-red instance that is running. I can not get port: process.env.PORT || 1880 working.

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## [\[Article\] Fourteen for, Fourteen against, why I love, hate and connect with Node-RED](https://discourse.nodered.org/t/article-fourteen-for-fourteen-against-why-i-love-hate-and-connect-with-node-red/78738)

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**Author:** [@gregorius](https://discourse.nodered.org/u/gregorius)\
**Replies:** 47\
**Last updated:** [5 June 2023 08:28 UTC](https://discourse.nodered.org/t/article-fourteen-for-fourteen-against-why-i-love-hate-and-connect-with-node-red/78738 "2023-06-05T08:28:10Z")

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Hi there, I just wrote an article describing my experiences with NR and what I find good and what I find bad. It's kinda esoteric since I consider NR to be a complete development environment with more potential than jus…

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## [How to install node offline using node-red Admin API](https://discourse.nodered.org/t/how-to-install-node-offline-using-node-red-admin-api/77995)

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**Author:** [@jayashree](https://discourse.nodered.org/u/jayashree)\
**Replies:** 8\
**Last updated:** [5 June 2023 08:26 UTC](https://discourse.nodered.org/t/how-to-install-node-offline-using-node-red-admin-api/77995 "2023-06-05T08:26:32Z")

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I am trying to install nodes in node-red without internet (offline). I have npm pack file (.tgz) and trying to install use admin method "/nodes" POST (POST /nodes : Node-RED), but "I am getting module not found error". I…

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## [Error in Javascript Code - satDiff and saturation cannot find](https://discourse.nodered.org/t/error-in-javascript-code-satdiff-and-saturation-cannot-find/78941)

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**Author:** [@MrThiemann](https://discourse.nodered.org/u/MrThiemann)\
**Replies:** 5\
**Last updated:** [5 June 2023 07:13 UTC](https://discourse.nodered.org/t/error-in-javascript-code-satdiff-and-saturation-cannot-find/78941 "2023-06-05T07:13:30Z")

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Hey, i have an Error in my Javascript Code... satDiff and saturation cannot find. do i need to install anything else? //These 3 lines boost the saturation, relative to how de-saturated a colour is satDiff = 100 - …

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## [How to approach this to handle hysterisis and prices](https://discourse.nodered.org/t/how-to-approach-this-to-handle-hysterisis-and-prices/78769)

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**Author:** [@craigcurtin](https://discourse.nodered.org/u/craigcurtin)\
**Replies:** 19\
**Last updated:** [5 June 2023 02:27 UTC](https://discourse.nodered.org/t/how-to-approach-this-to-handle-hysterisis-and-prices/78769 "2023-06-05T02:27:28Z")

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Guys, Our power rates are calculated based on wholesale rates which are updated every minute - i pull these rates down through an API and have then stored them (and use them throughout my home automation) for various ro…

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## [Rtsp stream + motion detect from unique process ffmepg](https://discourse.nodered.org/t/rtsp-stream-motion-detect-from-unique-process-ffmepg/78929)

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**Author:** [@diyIoT](https://discourse.nodered.org/u/diyIoT)\
**Replies:** 9\
**Last updated:** [4 June 2023 20:46 UTC](https://discourse.nodered.org/t/rtsp-stream-motion-detect-from-unique-process-ffmepg/78929 "2023-06-04T20:46:06Z")

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I have a Sonoff camera that I would like to manage from node-red. Based on the work of @kevinGodell, I easily displayed the video stream (stream). Now I would like to implement a motion detection (send by telegram) …

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## [Create a legend on the map](https://discourse.nodered.org/t/create-a-legend-on-the-map/78931)

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**Author:** [@jaime](https://discourse.nodered.org/u/jaime)\
**Replies:** 2\
**Last updated:** [4 June 2023 17:08 UTC](https://discourse.nodered.org/t/create-a-legend-on-the-map/78931 "2023-06-04T17:08:46Z")

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Hello everyone, I have a problem with obtaining a legend on the map that presents the "worldmap" node. I have accessed the document: "node-red-contrib-web-worldmap 2.37.4" and in its "command" section it says to obtain t…

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## [Use ffmepg to create MP4 from JPEG images sent over MQTT](https://discourse.nodered.org/t/use-ffmepg-to-create-mp4-from-jpeg-images-sent-over-mqtt/77878)

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**Author:** [@lduynkerke](https://discourse.nodered.org/u/lduynkerke)\
**Replies:** 19\
**Last updated:** [4 June 2023 13:04 UTC](https://discourse.nodered.org/t/use-ffmepg-to-create-mp4-from-jpeg-images-sent-over-mqtt/77878 "2023-06-04T13:04:36Z")

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Hi all, I'm working on a project with nest boxes, monitoring the birds in them. In order to do that, we use a camera as well as different sensors all controlled by an ESP32 Dev board. The sensor data and camera data are…

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## [Use Weak Indicator for ETag in http-request node header](https://discourse.nodered.org/t/use-weak-indicator-for-etag-in-http-request-node-header/78915)

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**Author:** [@dtillner](https://discourse.nodered.org/u/dtillner)\
**Replies:** 2\
**Last updated:** [4 June 2023 09:19 UTC](https://discourse.nodered.org/t/use-weak-indicator-for-etag-in-http-request-node-header/78915 "2023-06-04T09:19:26Z")

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I need to set the weak indicator in the HTTP header of the http-request node. The raw header should look like: If-Match:W/"JzE5OfC4OTI2MjglMTM1MjIWODgyMzcxOzAwOyc=" Note the leading W/ before the double quotes. This i…

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## [Time Stamp Not Captured in pdf which I generated](https://discourse.nodered.org/t/time-stamp-not-captured-in-pdf-which-i-generated/78887)

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**Author:** [@PRABHAKAR82](https://discourse.nodered.org/u/PRABHAKAR82)\
**Replies:** 20\
**Last updated:** [4 June 2023 03:00 UTC](https://discourse.nodered.org/t/time-stamp-not-captured-in-pdf-which-i-generated/78887 "2023-06-04T03:00:10Z")

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I generate a pdf report from sql query,all the row is filled but Time stamp row is empty. "This is My sql query" var fromdate = msg.payload.From; var todate = msg.payload.To; msg.topic = "SELECT \* FROM \`node-red\`.\`fina…

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## [HowTo protect a object property? How to find who write to this property?](https://discourse.nodered.org/t/howto-protect-a-object-property-how-to-find-who-write-to-this-property/78926)

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**Author:** [@Moosbueffel](https://discourse.nodered.org/u/Moosbueffel)\
**Replies:** 4\
**Last updated:** [3 June 2023 16:39 UTC](https://discourse.nodered.org/t/howto-protect-a-object-property-how-to-find-who-write-to-this-property/78926 "2023-06-03T16:39:23Z")

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I have a flow-variable like this: const consumers = \[ { "name" : "Hzg Bad\_A", // Consumer name "topic": "cmnd/eg/bad/th01/power", // MQTT topic; zum steuern "cmnd/" voransetzen "…

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## [Strange fails with cronplus and exec nodes](https://discourse.nodered.org/t/strange-fails-with-cronplus-and-exec-nodes/78881)

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**Author:** [@LosinIt](https://discourse.nodered.org/u/LosinIt)\
**Replies:** 16\
**Last updated:** [3 June 2023 13:35 UTC](https://discourse.nodered.org/t/strange-fails-with-cronplus-and-exec-nodes/78881 "2023-06-03T13:35:11Z")

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For a very long time now I have been trying to figure out what is different between the cronplus node operating on it's schedule and my clicking on its "doit" tab manually. It ALWAYS works when I click and USUALLY fails …

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## [Read data through an Ethernet port](https://discourse.nodered.org/t/read-data-through-an-ethernet-port/78909)

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**Author:** [@Jhontan14](https://discourse.nodered.org/u/Jhontan14)\
**Replies:** 4\
**Last updated:** [3 June 2023 12:53 UTC](https://discourse.nodered.org/t/read-data-through-an-ethernet-port/78909 "2023-06-03T12:53:48Z")

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Hello, could someone tell me if it is possible to receive information in node red through an Ethernet port? I have a scale in room A, which is quite a distance from room B, and I can't use a RS232 cable, that's why I…

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## [Modbus RTU master](https://discourse.nodered.org/t/modbus-rtu-master/78901)

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**Author:** [@VEENS973](https://discourse.nodered.org/u/VEENS973)\
**Replies:** 2\
**Last updated:** [2 June 2023 22:34 UTC](https://discourse.nodered.org/t/modbus-rtu-master/78901 "2023-06-02T22:34:54Z")

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hi I need help to do an rte Modbus master with node red to manage 10 slaves?.

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## [Image not getting displayed from the http server, but available in normal html file](https://discourse.nodered.org/t/image-not-getting-displayed-from-the-http-server-but-available-in-normal-html-file/78793)

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**Author:** [@Shariq](https://discourse.nodered.org/u/Shariq)\
**Replies:** 9\
**Last updated:** [2 June 2023 21:41 UTC](https://discourse.nodered.org/t/image-not-getting-displayed-from-the-http-server-but-available-in-normal-html-file/78793 "2023-06-02T21:41:37Z")

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Hello, This had been a working web page for me before my computer broke down. A web page which shows image in a normal html file wont render in a node red hosted web page 1. 2. Although the alerts are functiona…

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## [Tcp request data length](https://discourse.nodered.org/t/tcp-request-data-length/78866)

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**Author:** [@Nadhir](https://discourse.nodered.org/u/Nadhir)\
**Replies:** 16\
**Last updated:** [2 June 2023 16:23 UTC](https://discourse.nodered.org/t/tcp-request-data-length/78866 "2023-06-02T16:23:17Z")

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I am using TCP request node to communicate with an instrument teh problem is the node only retreives part of of the recieved data (my data is approximatly 2800 bytes ) , when I use an other software it works fine and al…

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## [Convert data string to json](https://discourse.nodered.org/t/convert-data-string-to-json/78904)

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**Author:** [@LinkView\_Maze](https://discourse.nodered.org/u/LinkView_Maze)\
**Replies:** 1\
**Last updated:** [2 June 2023 16:11 UTC](https://discourse.nodered.org/t/convert-data-string-to-json/78904 "2023-06-02T16:11:36Z")

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Hello, Via an http API I receive a response in payload an string: summary.Channel=0↵summary.EnteredSubtotal.Hour=0↵summary.EnteredSubtotal.Today=54↵summary.EnteredSubtotal.Total=119↵summary.EnteredSubtotal.TotalInTimeS…

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## [HX711 load cell node](https://discourse.nodered.org/t/hx711-load-cell-node/9154)

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**Author:** [@khalil](https://discourse.nodered.org/u/khalil)\
**Replies:** 5\
**Last updated:** [2 June 2023 15:06 UTC](https://discourse.nodered.org/t/hx711-load-cell-node/9154 "2023-06-02T15:06:31Z")

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Hi everyone. I'm still a beginner and I'm preparing a program that displays the current weight on node red using a load cell and hx711 and raspberry pi3. I have the python program that calculates the weight it works well…

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## [How to handle multiple UnitID's connected to same IP in modbus over ethernet?](https://discourse.nodered.org/t/how-to-handle-multiple-unitids-connected-to-same-ip-in-modbus-over-ethernet/78899)

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**Author:** [@ahmadmujtaba95](https://discourse.nodered.org/u/ahmadmujtaba95)\
**Replies:** 0\
**Last updated:** [2 June 2023 12:05 UTC](https://discourse.nodered.org/t/how-to-handle-multiple-unitids-connected-to-same-ip-in-modbus-over-ethernet/78899 "2023-06-02T12:05:42Z")

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Hello, it is my first time using Node-Red so please bear with me. I have come across a situation where we have multiple Unit-Id connected via same IP address. Each unit-id corresponds to each energy meter. All energy me…

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## [Request node with ca certificate](https://discourse.nodered.org/t/request-node-with-ca-certificate/78880)

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**Author:** [@Marty1982](https://discourse.nodered.org/u/Marty1982)\
**Replies:** 2\
**Last updated:** [2 June 2023 10:51 UTC](https://discourse.nodered.org/t/request-node-with-ca-certificate/78880 "2023-06-02T10:51:32Z")

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Hi all! I'm doing some request to an API that has SSL certificate. The output says the follwing: RequestError: unable to verify the first certificate : https://urlfromtheclient.com and also UNABLE\_TO\_VERIFY\_LEAF\_SIGNA…

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## [Threshold function or node](https://discourse.nodered.org/t/threshold-function-or-node/78872)

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**Author:** [@Popolackie](https://discourse.nodered.org/u/Popolackie)\
**Replies:** 2\
**Last updated:** [2 June 2023 06:18 UTC](https://discourse.nodered.org/t/threshold-function-or-node/78872 "2023-06-02T06:18:10Z")

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Hi dear forum, I am stuck on a topic concerning whether to use a function or just nodes. I would like to create a threshold with damping as we use it in PLC programming (just because I´m used to it). If there is any easi…

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## [Load model JSON with node tf-model](https://discourse.nodered.org/t/load-model-json-with-node-tf-model/78885)

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**Author:** [@Aula-Faridah](https://discourse.nodered.org/u/Aula-Faridah)\
**Replies:** 0\
**Last updated:** [2 June 2023 05:48 UTC](https://discourse.nodered.org/t/load-model-json-with-node-tf-model/78885 "2023-06-02T05:48:58Z")

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Cannot read properties of undefined (reading 'versions') while using node tf-model. I use JSON format for the model where the model is stored in the local server directory (ubuntu). How to solve it?

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## [HA-mqtt beginner help needed - I'm so close!](https://discourse.nodered.org/t/ha-mqtt-beginner-help-needed-im-so-close/78878)

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**Author:** [@Tul](https://discourse.nodered.org/u/Tul)\
**Replies:** 4\
**Last updated:** [1 June 2023 19:20 UTC](https://discourse.nodered.org/t/ha-mqtt-beginner-help-needed-im-so-close/78878 "2023-06-01T19:20:10Z")

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Hi all, Trying to light a Ledvance bulb with HA/mqtt in Node-RED. I'm up and running with a fresh install on HA-os. My Sonoff button works in Node-RED so the broker is working. I can toggle the bulb in Zigbee2mqtt con…

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## [Uib-brand.css sometimes injected](https://discourse.nodered.org/t/uib-brand-css-sometimes-injected/78876)

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**Author:** [@jrmobley](https://discourse.nodered.org/u/jrmobley)\
**Replies:** 2\
**Last updated:** [1 June 2023 19:18 UTC](https://discourse.nodered.org/t/uib-brand-css-sometimes-injected/78876 "2023-06-01T19:18:10Z")

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I am using uibuilder with Svelte and I am providing my own stylesheet. Sometimes 'uib-brand.css' gets injected into the page and sometimes it does not. When it gets injected, it interferes with my own styling. From th…

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## [Servo motor gpiod guide](https://discourse.nodered.org/t/servo-motor-gpiod-guide/78648)

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**Author:** [@WBr](https://discourse.nodered.org/u/WBr)\
**Replies:** 26\
**Last updated:** [1 June 2023 16:10 UTC](https://discourse.nodered.org/t/servo-motor-gpiod-guide/78648 "2023-06-01T16:10:32Z")

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I was struggling to control a servo motor (TS90M) with gpiod. But I finally got it working. Now time to help others with the same struggle even tho it is straightforward to some people. I was not one of those... Let me…

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## [Automated Iperf testing](https://discourse.nodered.org/t/automated-iperf-testing/78864)

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**Author:** [@ceejm1](https://discourse.nodered.org/u/ceejm1)\
**Replies:** 1\
**Last updated:** [1 June 2023 15:29 UTC](https://discourse.nodered.org/t/automated-iperf-testing/78864 "2023-06-01T15:29:50Z")

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Hello, Has anyone used node-red to control an Iperf client and display the results? I thought there might be a node for it but I can't find anything.... Cheers James

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