# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=633

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

**Page:** 634

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## [Extract a variable of a Json](https://discourse.nodered.org/t/extract-a-variable-of-a-json/37660)

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**Author:** [@Roger](https://discourse.nodered.org/u/Roger)\
**Replies:** 17\
**Last updated:** [24 December 2020 10:23 UTC](https://discourse.nodered.org/t/extract-a-variable-of-a-json/37660 "2020-12-24T10:23:45Z")

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Hello, I have a JSON with diferent variables in my node-red and I need to extract one of this variables at other node-red, somebody know how I can do it? I attach the picture of the variables, I need to extract in\_temp. …

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## [Limit a signal or payload?](https://discourse.nodered.org/t/limit-a-signal-or-payload/37911)

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**Author:** [@Steinspiel](https://discourse.nodered.org/u/Steinspiel)\
**Replies:** 8\
**Last updated:** [24 December 2020 10:23 UTC](https://discourse.nodered.org/t/limit-a-signal-or-payload/37911 "2020-12-24T10:23:37Z")

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Hello, Does anyone know a solution for my problem: An "mqtt-in" sends a String: "ON" every 8 seconds. This activates an "openHAB\_Switch\_Item". If the transmission is interrupted by "mqtt-in" for more than 20 seconds, a…

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## [Help with error detection creation](https://discourse.nodered.org/t/help-with-error-detection-creation/37950)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 4\
**Last updated:** [24 December 2020 10:01 UTC](https://discourse.nodered.org/t/help-with-error-detection-creation/37950 "2020-12-24T10:01:37Z")

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I have a subflow and in there is this bit of code: if (ICDID != device) { node.warn("Node Configuration not set"); node.error("Node Configuration not set", msg) // fa-eye-slash return; } Which is nice …

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## [Starting supercollider synthesizer before starting node-red](https://discourse.nodered.org/t/starting-supercollider-synthesizer-before-starting-node-red/37922)

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**Author:** [@johncohn](https://discourse.nodered.org/u/johncohn)\
**Replies:** 3\
**Last updated:** [24 December 2020 09:40 UTC](https://discourse.nodered.org/t/starting-supercollider-synthesizer-before-starting-node-red/37922 "2020-12-24T09:40:56Z")

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Friends, Hoping somebody has an idea for me here. I'm using node-red on a raspi 4 for a fun musical project (a 10 m long touch Musical keyboard). Im using very nice extension node-red-contrib-music Which is perfect f…

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## [Losing configuration nodes from within subflow](https://discourse.nodered.org/t/losing-configuration-nodes-from-within-subflow/37635)

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**Author:** [@dathor](https://discourse.nodered.org/u/dathor)\
**Replies:** 4\
**Last updated:** [24 December 2020 09:17 UTC](https://discourse.nodered.org/t/losing-configuration-nodes-from-within-subflow/37635 "2020-12-24T09:17:50Z")

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Hello I develop my project on my windows laptop with (at the moment) node-red rev 1.1.2 (for no particular reason i just don't update that often). I also deploy/copy this project to other windows machines and this proc…

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## [Invalid endpoint error while usingnode-red-contrib-opcua on IBM Cloud](https://discourse.nodered.org/t/invalid-endpoint-error-while-usingnode-red-contrib-opcua-on-ibm-cloud/37960)

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**Author:** [@murari678](https://discourse.nodered.org/u/murari678)\
**Replies:** 0\
**Last updated:** [24 December 2020 08:57 UTC](https://discourse.nodered.org/t/invalid-endpoint-error-while-usingnode-red-contrib-opcua-on-ibm-cloud/37960 "2020-12-24T08:57:08Z")

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Hi mates, I am trying to connect Kepware opc server installed on my local windows pc to Node-red hosted on IBM cloud. i am using node-red-contrib-opcua to collect data from Kepware and facing below error. Is this a cert…

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## [Double api connection Node-red](https://discourse.nodered.org/t/double-api-connection-node-red/37959)

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**Author:** [@bce](https://discourse.nodered.org/u/bce)\
**Replies:** 0\
**Last updated:** [24 December 2020 08:44 UTC](https://discourse.nodered.org/t/double-api-connection-node-red/37959 "2020-12-24T08:44:10Z")

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Nora node-red had a disconnect and in the log I suddenly had a double api connection. deleted everything in node red, google home and revoked the token. all steps were reset, yet the message duplicate API connection pe…

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## [\[wiot:connectionPool:getClient\] \[DeviceClient:publish\] Client is not connected](https://discourse.nodered.org/t/wiotgetclient-deviceclient-publish-client-is-not-connected/18812)

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**Author:** [@sandeepanj](https://discourse.nodered.org/u/sandeepanj)\
**Replies:** 2\
**Last updated:** [24 December 2020 05:53 UTC](https://discourse.nodered.org/t/wiotgetclient-deviceclient-publish-client-is-not-connected/18812 "2020-12-24T05:53:30Z")

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OPCUA CLIENT NODE TO IBM BLUEMIX. EROOR :heart\_eyes: 5 Dec 11:38:16 - \[info\] \[OpcUa-Client:27205b2d.dfc934\] No certificate used. \[BaseClient:connect\] Connecting to IoTF with host : ssl://za027j.messaging.internetofth…

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## [Connecting to a Telnet Server & Displaying the Contents](https://discourse.nodered.org/t/connecting-to-a-telnet-server-displaying-the-contents/37895)

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**Author:** [@aa0z](https://discourse.nodered.org/u/aa0z)\
**Replies:** 13\
**Last updated:** [24 December 2020 03:36 UTC](https://discourse.nodered.org/t/connecting-to-a-telnet-server-displaying-the-contents/37895 "2020-12-24T03:36:04Z")

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I'm having some telnet connection issues and need some help. There are telnet servers that you can connect to that display ham radio stations that are on the amateur radio air waves. It sends a string (usually login:) …

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## [Bufferparser with U64 Modbus](https://discourse.nodered.org/t/bufferparser-with-u64-modbus/37071)

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**Author:** [@Becker](https://discourse.nodered.org/u/Becker)\
**Replies:** 89\
**Last updated:** [23 December 2020 22:52 UTC](https://discourse.nodered.org/t/bufferparser-with-u64-modbus/37071 "2020-12-23T22:52:09Z")

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Hi, I tried to query a U64 Modbus value for the first time. But no matter how I configure the buffer parser, there is always only one error. What am I missing?

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## [Playing sound after something](https://discourse.nodered.org/t/playing-sound-after-something/37949)

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**Author:** [@nsacras](https://discourse.nodered.org/u/nsacras)\
**Replies:** 0\
**Last updated:** [23 December 2020 22:15 UTC](https://discourse.nodered.org/t/playing-sound-after-something/37949 "2020-12-23T22:15:17Z")

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Dear all, I'm starting on node-red. I have home assistant installed on a raspberry 4 running last system. I have some sonnoff zigbee sensors working well and I would like to play some sound when I open my door (it has…

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## [Looking for: Finite State Machine (FSM) library to manage multiple devices](https://discourse.nodered.org/t/looking-for-finite-state-machine-fsm-library-to-manage-multiple-devices/37940)

<div class="topic-metadata">

**Author:** [@RGNagel](https://discourse.nodered.org/u/RGNagel)\
**Replies:** 4\
**Last updated:** [23 December 2020 21:33 UTC](https://discourse.nodered.org/t/looking-for-finite-state-machine-fsm-library-to-manage-multiple-devices/37940 "2020-12-23T21:33:39Z")

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Hi, I have multiple devices that can connect via MQTT into my node-red application. Every device has a unique ID (let's name it devID). I need to keep a bunch of state information for every device separately, and the st…

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## [In 1 node, read several information and make 1 message](https://discourse.nodered.org/t/in-1-node-read-several-information-and-make-1-message/37924)

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**Author:** [@roro50](https://discourse.nodered.org/u/roro50)\
**Replies:** 27\
**Last updated:** [23 December 2020 21:18 UTC](https://discourse.nodered.org/t/in-1-node-read-several-information-and-make-1-message/37924 "2020-12-23T21:18:24Z")

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Hello, I turn to you again, because I have a difficulty: on the previous node I read the info from openweather, but I would like to summarize the info on a much shorter post. (and translate it into French that I am) I …

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## [Node red crashes after contrib-hue finished installing](https://discourse.nodered.org/t/node-red-crashes-after-contrib-hue-finished-installing/37936)

<div class="topic-metadata">

**Author:** [@Nice\_to\_have](https://discourse.nodered.org/u/Nice_to_have)\
**Replies:** 2\
**Last updated:** [23 December 2020 18:26 UTC](https://discourse.nodered.org/t/node-red-crashes-after-contrib-hue-finished-installing/37936 "2020-12-23T18:26:52Z")

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Just my luck, I am using a raspberry 4 for a while now for home automation together with 4 other pi's. But now node red on the rpi4 crashed after I installed the contrib-hue. It crashed the moment node red palletmanag…

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## [Error while Installing NPM node-red-contrib-onvif-nodes](https://discourse.nodered.org/t/error-while-installing-npm-node-red-contrib-onvif-nodes/37773)

<div class="topic-metadata">

**Author:** [@Napoleon](https://discourse.nodered.org/u/Napoleon)\
**Replies:** 14\
**Last updated:** [23 December 2020 18:02 UTC](https://discourse.nodered.org/t/error-while-installing-npm-node-red-contrib-onvif-nodes/37773 "2020-12-23T18:02:07Z")

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Hello, I am trying to install the node-red-contrib-onvif-nodes on my RaspberryMatic. Unfortunately I always get the following error: root@homematic-raspi:/usr/local/addons/redmatic# npm install node-red-contrib-on vi…

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## [Node-red-contrib-spotify auth problem](https://discourse.nodered.org/t/node-red-contrib-spotify-auth-problem/17958)

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**Author:** [@mouthpiec](https://discourse.nodered.org/u/mouthpiec)\
**Replies:** 1\
**Last updated:** [23 December 2020 17:06 UTC](https://discourse.nodered.org/t/node-red-contrib-spotify-auth-problem/17958 "2020-12-23T17:06:53Z")

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hi, I am running Node Red on Home Assistant running on a RPi3B through a docker. When I try to authenticate the keys using node red i am getting an error that page is not reachable. when using the config directly on h…

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## [How to use (client) mTLS in the http-request node?](https://discourse.nodered.org/t/how-to-use-client-mtls-in-the-http-request-node/37921)

<div class="topic-metadata">

**Author:** [@w4tsn](https://discourse.nodered.org/u/w4tsn)\
**Replies:** 0\
**Last updated:** [23 December 2020 12:47 UTC](https://discourse.nodered.org/t/how-to-use-client-mtls-in-the-http-request-node/37921 "2020-12-23T12:47:17Z")

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I have a server endpoint secured with an mTLS based authentication which I want to use for a GET request in the http-request node. I expected this to simply work by setting SSL/TLS configuration node with the crt, key an…

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## [\[SOLVED\]Trouble with storing and retrieving IP data](https://discourse.nodered.org/t/solved-trouble-with-storing-and-retrieving-ip-data/37897)

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**Author:** [@JonHeron](https://discourse.nodered.org/u/JonHeron)\
**Replies:** 6\
**Last updated:** [23 December 2020 12:01 UTC](https://discourse.nodered.org/t/solved-trouble-with-storing-and-retrieving-ip-data/37897 "2020-12-23T12:01:21Z")

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Hello, I am trying to make a flow that will email me when my IP changes on a pi I have at another property. I am using the nodered-contrib-IP object. My default IP gets added to lastIp but it never gets updated via th…

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## [I have a question about payload](https://discourse.nodered.org/t/i-have-a-question-about-payload/37918)

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**Author:** [@marconr9](https://discourse.nodered.org/u/marconr9)\
**Replies:** 2\
**Last updated:** [23 December 2020 13:00 UTC](https://discourse.nodered.org/t/i-have-a-question-about-payload/37918 "2020-12-23T13:00:14Z")

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Hi i'm new to node red and have maybe a stupid question. I want to integrate my dishwasher in my Domoticz system. Everything working fine but there is! one thing In my status window in Domoticz i see the complete v…

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## [Millheat API developing](https://discourse.nodered.org/t/millheat-api-developing/37919)

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**Author:** [@farcry](https://discourse.nodered.org/u/farcry)\
**Replies:** 3\
**Last updated:** [23 December 2020 12:47 UTC](https://discourse.nodered.org/t/millheat-api-developing/37919 "2020-12-23T12:47:34Z")

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Hello. Is Node-red going to develope node for MillHeat like OpenHab (see link) Thanks. BR.

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## [Node-Red Testinstance for Homematic](https://discourse.nodered.org/t/node-red-testinstance-for-homematic/37884)

<div class="topic-metadata">

**Author:** [@oma](https://discourse.nodered.org/u/oma)\
**Replies:** 4\
**Last updated:** [23 December 2020 12:05 UTC](https://discourse.nodered.org/t/node-red-testinstance-for-homematic/37884 "2020-12-23T12:05:02Z")

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I am running Redmatic on my CCU3 without trouble. Now i would like to have a testbed seperate from "production" if you like. I did setup another instance of Nodered on a seperate (x86!) Server and left redmatic on the CC…

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## [Redmatic and external Node Red show different behaviour?](https://discourse.nodered.org/t/redmatic-and-external-node-red-show-different-behaviour/37917)

<div class="topic-metadata">

**Author:** [@oma](https://discourse.nodered.org/u/oma)\
**Replies:** 0\
**Last updated:** [23 December 2020 12:00 UTC](https://discourse.nodered.org/t/redmatic-and-external-node-red-show-different-behaviour/37917 "2020-12-23T12:00:53Z")

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I have two instances of Node Red: One on my CCU3 (Redmatic) one on a separate host. I was able to connect to the CCU from both instances but they don´t provide the same value?!? Via RPC Events i get the same message outp…

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## [Twinkly Lights Control - Brightness HTTP POST](https://discourse.nodered.org/t/twinkly-lights-control-brightness-http-post/37327)

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**Author:** [@Brew](https://discourse.nodered.org/u/Brew)\
**Replies:** 18\
**Last updated:** [23 December 2020 11:20 UTC](https://discourse.nodered.org/t/twinkly-lights-control-brightness-http-post/37327 "2020-12-23T11:20:45Z")

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Hi there, it's that time of year and adventures in Christmas lights are a plenty, I've got some twinkly lights and having taken a bit from this guide I can turn them on and off. import xled control = xled.ControlInter…

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## [Can´t use Projects, Git isnt configured](https://discourse.nodered.org/t/can-t-use-projects-git-isnt-configured/37887)

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**Author:** [@Stumpy](https://discourse.nodered.org/u/Stumpy)\
**Replies:** 3\
**Last updated:** [23 December 2020 09:59 UTC](https://discourse.nodered.org/t/can-t-use-projects-git-isnt-configured/37887 "2020-12-23T09:59:16Z")

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Hi i am using ioBroker with the Node-Red adapter on an ubuntu lxc. i wanted to use Projects, but i always get the message " Your Git-Client is not configured with an Username/Email". i have git installed and set up it…

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## [Trigger on USB Drive Insertion - Raspberry Pi](https://discourse.nodered.org/t/trigger-on-usb-drive-insertion-raspberry-pi/19096)

<div class="topic-metadata">

**Author:** [@jeff8houses](https://discourse.nodered.org/u/jeff8houses)\
**Replies:** 11\
**Last updated:** [23 December 2020 09:28 UTC](https://discourse.nodered.org/t/trigger-on-usb-drive-insertion-raspberry-pi/19096 "2020-12-23T09:28:32Z")

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Hey friends! I'm working on a Node-RED Pi Zero project and am looking for a way to monitor when a USB drive is plugged in. The aim is to auto-copy a bunch of files when a drive is inserted then unmount the drive. Copying…

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## [MQTT with Arduino Nano + NodeRed](https://discourse.nodered.org/t/mqtt-with-arduino-nano-nodered/37351)

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**Author:** [@PizzaProgram](https://discourse.nodered.org/u/PizzaProgram)\
**Replies:** 23\
**Last updated:** [23 December 2020 09:13 UTC](https://discourse.nodered.org/t/mqtt-with-arduino-nano-nodered/37351 "2020-12-23T09:13:40Z")

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Continuing the discussion from Arduino i2c Firmata: Is there any way to connect Arduino NANO boards to handle I/O + Analog (+ I2C ?) through NodeRed? Important: NANO has ONLY a USB port! ... so most of the MQTT librar…

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## [Nodejs version in node-RED docker container](https://discourse.nodered.org/t/nodejs-version-in-node-red-docker-container/37901)

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**Author:** [@augjoh](https://discourse.nodered.org/u/augjoh)\
**Replies:** 0\
**Last updated:** [23 December 2020 05:57 UTC](https://discourse.nodered.org/t/nodejs-version-in-node-red-docker-container/37901 "2020-12-23T05:57:55Z")

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Hi there, I've written a little Node-Red project, that relies on the docker container of Node-Red. I would like to upgrade to a newer nodejs version. Currently I'm using nodejs version 10 (slim). How can I update to the …

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## [Horizontal line in card - (small contribution)](https://discourse.nodered.org/t/horizontal-line-in-card-small-contribution/37847)

<div class="topic-metadata">

**Author:** [@Tomadoggy](https://discourse.nodered.org/u/Tomadoggy)\
**Replies:** 1\
**Last updated:** [22 December 2020 18:33 UTC](https://discourse.nodered.org/t/horizontal-line-in-card-small-contribution/37847 "2020-12-22T18:33:23Z")

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I have come across a few topics where users are attempting to place a horizontal line in their UI. I myself had this need so messed around with a \</\>template node and some HTML. There could be better ways, but this is …

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## [Integrating an angular app in node properties, TypeError: $(...).i18n](https://discourse.nodered.org/t/integrating-an-angular-app-in-node-properties-typeerror-i18n/37718)

<div class="topic-metadata">

**Author:** [@Kib](https://discourse.nodered.org/u/Kib)\
**Replies:** 8\
**Last updated:** [22 December 2020 18:12 UTC](https://discourse.nodered.org/t/integrating-an-angular-app-in-node-properties-typeerror-i18n/37718 "2020-12-22T18:12:43Z")

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I have built a couple of custom nodes (mostly using the default settings and not anything fancy) and i just tried the following to serve an existing compiled angular application inside the node-properties HTML. the new h…

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## [Energy calculation](https://discourse.nodered.org/t/energy-calculation/11851)

<div class="topic-metadata">

**Author:** [@Pisti](https://discourse.nodered.org/u/Pisti)\
**Replies:** 5\
**Last updated:** [22 December 2020 17:29 UTC](https://discourse.nodered.org/t/energy-calculation/11851 "2020-12-22T17:29:33Z")

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Hi all. I try to work out how to make a function javascript to calculate cost ow energy. I have daily data coming through mqtt, which is zero itself every day at 00:00 I managed to store the data to the flow, and I mana…

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