# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=833

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

**Page:** 834

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## [Using Node-RED IMAP email payload as an iOS notification](https://discourse.nodered.org/t/using-node-red-imap-email-payload-as-an-ios-notification/17185)

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**Author:** [@grantalewis](https://discourse.nodered.org/u/grantalewis)\
**Replies:** 8\
**Last updated:** [27 October 2019 11:42 UTC](https://discourse.nodered.org/t/using-node-red-imap-email-payload-as-an-ios-notification/17185 "2019-10-27T11:42:46Z")

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I use Node-RED in Home Assistant (Hass.io running in Docker on Ubuntu 64). My current project is to move all messages -- texts, emails, iOS notifications, etc. generated by the various components in my system -- to iOS n…

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## [Node red mongodb join?](https://discourse.nodered.org/t/node-red-mongodb-join/17183)

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**Author:** [@Vernian](https://discourse.nodered.org/u/Vernian)\
**Replies:** 4\
**Last updated:** [27 October 2019 08:06 UTC](https://discourse.nodered.org/t/node-red-mongodb-join/17183 "2019-10-27T08:06:03Z")

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Hi. I use mongodb to my project. How to join query?

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## [How to count the number of objects in an array](https://discourse.nodered.org/t/how-to-count-the-number-of-objects-in-an-array/17186)

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**Author:** [@gv\_gv](https://discourse.nodered.org/u/gv_gv)\
**Replies:** 2\
**Last updated:** [27 October 2019 07:48 UTC](https://discourse.nodered.org/t/how-to-count-the-number-of-objects-in-an-array/17186 "2019-10-27T07:48:37Z")

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Hello there, I am using google computer vision pallete for image recognition. It outputs an array at msg.details.faceAnnotations depending upon the number of person in the picture. The objects in the array is equal to t…

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## [Move file to network pc](https://discourse.nodered.org/t/move-file-to-network-pc/17171)

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**Author:** [@matrixratrix](https://discourse.nodered.org/u/matrixratrix)\
**Replies:** 8\
**Last updated:** [26 October 2019 20:15 UTC](https://discourse.nodered.org/t/move-file-to-network-pc/17171 "2019-10-26T20:15:54Z")

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Hello, I'm totally new to node red, and also raspberry, and I am trying to fight to move txt files to a pc within the network. I trying use the "node-red-contrib-fs-ops" move node , there no problem when files are move…

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## [Dim or brighten gradually while pressing button? Lerp problem?](https://discourse.nodered.org/t/dim-or-brighten-gradually-while-pressing-button-lerp-problem/17068)

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**Author:** [@yamlCase](https://discourse.nodered.org/u/yamlCase)\
**Replies:** 3\
**Last updated:** [26 October 2019 19:24 UTC](https://discourse.nodered.org/t/dim-or-brighten-gradually-while-pressing-button-lerp-problem/17068 "2019-10-26T19:24:21Z")

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Is there a simple solution to gradually increase the brightness of a light while holding a button, and stop dimming as soon as I release? I'm harkening back to my game dev days where we'd do this with linear interpolati…

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## [BLE issues whats the next step?](https://discourse.nodered.org/t/ble-issues-whats-the-next-step/17122)

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**Author:** [@droidblast](https://discourse.nodered.org/u/droidblast)\
**Replies:** 5\
**Last updated:** [26 October 2019 19:07 UTC](https://discourse.nodered.org/t/ble-issues-whats-the-next-step/17122 "2019-10-26T19:07:52Z")

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Hi to everyone and thanks in advance. Trying to install node-red-contrib-generic-ble 3.1.0 on Hassio / Home Assistant / Node Red palette. I get the following error. I am looking for a way to talk to a BLE temp sensor a…

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## [Turn the output after some time for few seconds](https://discourse.nodered.org/t/turn-the-output-after-some-time-for-few-seconds/17138)

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**Author:** [@pranavthakkar](https://discourse.nodered.org/u/pranavthakkar)\
**Replies:** 8\
**Last updated:** [26 October 2019 12:33 UTC](https://discourse.nodered.org/t/turn-the-output-after-some-time-for-few-seconds/17138 "2019-10-26T12:33:27Z")

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Hi I want to turn the output of my arduino after some time like 12 hours and it will on for few seconds like 10 sec after that it will off only if the input switch is on. if switch goes off all process are off. again a…

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## [Node-red IPv6 Listening](https://discourse.nodered.org/t/node-red-ipv6-listening/17094)

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**Author:** [@UweG](https://discourse.nodered.org/u/UweG)\
**Replies:** 3\
**Last updated:** [26 October 2019 09:45 UTC](https://discourse.nodered.org/t/node-red-ipv6-listening/17094 "2019-10-26T09:45:25Z")

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Hi. I have installed node-red at raspberry-pi My internet-provider use ds-lite which only use IPv6 to access from outside. How can i access node-red with ipv6. Normally ipv4 "199.0.0.1:1880" works Example IPv6-adres…

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## [Solar data from mqtt to PVoutput](https://discourse.nodered.org/t/solar-data-from-mqtt-to-pvoutput/17150)

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**Author:** [@R0yk3](https://discourse.nodered.org/u/R0yk3)\
**Replies:** 4\
**Last updated:** [25 October 2019 22:54 UTC](https://discourse.nodered.org/t/solar-data-from-mqtt-to-pvoutput/17150 "2019-10-25T22:54:38Z")

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Hello, i have been busting my head with tis issue. I have input from mqtt and i want some of this input formatted into a url and push it to pvoutput. I know what the URL has to look like. Manualy making the url works…

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## [How do you use the Library feature?](https://discourse.nodered.org/t/how-do-you-use-the-library-feature/9642)

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**Author:** [@utmostGrandPoobah](https://discourse.nodered.org/u/utmostGrandPoobah)\
**Replies:** 4\
**Last updated:** [25 October 2019 20:59 UTC](https://discourse.nodered.org/t/how-do-you-use-the-library-feature/9642 "2019-10-25T20:59:24Z")

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I have been playing with Node-RED more and more and noticed there's a Library feature in the Import-\>Library path. When I follow the bread crumbs however, I only see a null list in the Library section. How is this featu…

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## [SDcard full of log files - (TCP error TP-Link)](https://discourse.nodered.org/t/sdcard-full-of-log-files-tcp-error-tp-link/17155)

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**Author:** [@877](https://discourse.nodered.org/u/877)\
**Replies:** 5\
**Last updated:** [25 October 2019 18:43 UTC](https://discourse.nodered.org/t/sdcard-full-of-log-files-tcp-error-tp-link/17155 "2019-10-25T18:43:12Z")

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Today my 16GB sdcard totally filled up and crashed node red. Luckily I had my flows backup up from a few days back. The culprits are: var/log/daemon.log (3.5GB) var/log/syslog (0.5GB) various .gz log file t…

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## [Why do I have 8 configuration nodes for node-wemo?](https://discourse.nodered.org/t/why-do-i-have-8-configuration-nodes-for-node-wemo/17052)

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**Author:** [@hepcat72](https://discourse.nodered.org/u/hepcat72)\
**Replies:** 3\
**Last updated:** [25 October 2019 15:53 UTC](https://discourse.nodered.org/t/why-do-i-have-8-configuration-nodes-for-node-wemo/17052 "2019-10-25T15:53:29Z")

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I created a wemo input node last weekend for my wemo motion sensor in a new subflow that I named "Motion Triggers". However, I could not get the input node to work. Whenever I tripped the motion sensor, I'd watch the d…

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## [Lwm2m creating a object](https://discourse.nodered.org/t/lwm2m-creating-a-object/17146)

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**Author:** [@Iliyas](https://discourse.nodered.org/u/Iliyas)\
**Replies:** 1\
**Last updated:** [25 October 2019 14:50 UTC](https://discourse.nodered.org/t/lwm2m-creating-a-object/17146 "2019-10-25T14:50:22Z")

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Hello everyone, I'm creating a object into the Lwm2m server with this function { "420": { "0": { "0": { "type": "INTEGER", "acl": "R", "value":45 }, "1": { "type": "INTEGER", "acl": "RWD", "value": 900001 }…

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## [How to get a value from a string](https://discourse.nodered.org/t/how-to-get-a-value-from-a-string/17133)

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**Author:** [@alexpelli](https://discourse.nodered.org/u/alexpelli)\
**Replies:** 2\
**Last updated:** [25 October 2019 14:44 UTC](https://discourse.nodered.org/t/how-to-get-a-value-from-a-string/17133 "2019-10-25T14:44:57Z")

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Hi all.. I'm quite new in Node Red and I'm having some problems to get a single value from a string. I'm using Tado contrib to get values (temperature and humidity).. but I receive the followign string: 24/10/2019, 14:4…

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## [Help with a simple Cron job to understand the concept](https://discourse.nodered.org/t/help-with-a-simple-cron-job-to-understand-the-concept/17106)

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**Author:** [@pvanklink](https://discourse.nodered.org/u/pvanklink)\
**Replies:** 26\
**Last updated:** [25 October 2019 13:35 UTC](https://discourse.nodered.org/t/help-with-a-simple-cron-job-to-understand-the-concept/17106 "2019-10-25T13:35:07Z")

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Hi, i need a little help with a very simply job... I like to move my files from /mnt/mntroot to /mnt/mntnas I installed node-red cron + installed dashboard add a flow to move the files from /mnt/mntroot to /mnt/mntna…

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## [Case triggered storing](https://discourse.nodered.org/t/case-triggered-storing/14314)

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**Author:** [@Quercross](https://discourse.nodered.org/u/Quercross)\
**Replies:** 25\
**Last updated:** [25 October 2019 13:17 UTC](https://discourse.nodered.org/t/case-triggered-storing/14314 "2019-10-25T13:17:22Z")

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Hi, i would like to push data from one payload into a file only if an other payload from an other sensor is present or changes. How is this possible? I need something like an if clause i think but don't realy know how. …

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## [Custom serial node](https://discourse.nodered.org/t/custom-serial-node/17126)

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**Author:** [@Charlotte](https://discourse.nodered.org/u/Charlotte)\
**Replies:** 0\
**Last updated:** [25 October 2019 09:21 UTC](https://discourse.nodered.org/t/custom-serial-node/17126 "2019-10-25T09:21:34Z")

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Hi everyone, I'm using Node-red to develop an app to interact with serial devices : get data, send setpoints... I'm using it on Raspberry Pi 4 with Raspbian Buster. Users of this app will plug their serial devices to …

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## [How to delay in a while loop?](https://discourse.nodered.org/t/how-to-delay-in-a-while-loop/17108)

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**Author:** [@WhiteLion](https://discourse.nodered.org/u/WhiteLion)\
**Replies:** 9\
**Last updated:** [25 October 2019 08:59 UTC](https://discourse.nodered.org/t/how-to-delay-in-a-while-loop/17108 "2019-10-25T08:59:35Z")

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Hiho, here I come with another problem: This will kill the connection because of running in a loop without delay. What to do now ? while(utsRelayOff \> utsCurrent) { utsCurrent = parseInt(+new Date()); utsRelay…

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## [Problem converting Xport Ethernet output to string](https://discourse.nodered.org/t/problem-converting-xport-ethernet-output-to-string/16992)

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**Author:** [@engrjayze](https://discourse.nodered.org/u/engrjayze)\
**Replies:** 10\
**Last updated:** [25 October 2019 08:11 UTC](https://discourse.nodered.org/t/problem-converting-xport-ethernet-output-to-string/16992 "2019-10-25T08:11:14Z")

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Hi All, This is my first thread. May I kindly ask for support on below concern. Data source: Xport (RS232C to Ethernet) I cannot fully convert the buffer data from tcp -\> I always get some boxes and ??. Can you help …

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## [How do I achieve clustering and load balancing with Node-red native capabilities](https://discourse.nodered.org/t/how-do-i-achieve-clustering-and-load-balancing-with-node-red-native-capabilities/16672)

<div class="topic-metadata">

**Author:** [@arjunjs1993](https://discourse.nodered.org/u/arjunjs1993)\
**Replies:** 10\
**Last updated:** [25 October 2019 07:54 UTC](https://discourse.nodered.org/t/how-do-i-achieve-clustering-and-load-balancing-with-node-red-native-capabilities/16672 "2019-10-25T07:54:48Z")

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I need to run multiple node-red instances and should be able to load-balance the flows between these nodes . Is there any built in support for the same ??

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## [Unable to see published node in palette](https://discourse.nodered.org/t/unable-to-see-published-node-in-palette/17033)

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**Author:** [@uma](https://discourse.nodered.org/u/uma)\
**Replies:** 3\
**Last updated:** [25 October 2019 00:58 UTC](https://discourse.nodered.org/t/unable-to-see-published-node-in-palette/17033 "2019-10-25T00:58:01Z")

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Hi I have published a node-red node to npm yesterday (https://www.npmjs.com/package/node-red-contrib-oracle-ng) but still dont see it under Manage Palette\>Install under node-red. I have ensured that I have node-red unde…

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## [In-VPN P2P group messaging system](https://discourse.nodered.org/t/in-vpn-p2p-group-messaging-system/17092)

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**Author:** [@adammo94](https://discourse.nodered.org/u/adammo94)\
**Replies:** 1\
**Last updated:** [24 October 2019 20:35 UTC](https://discourse.nodered.org/t/in-vpn-p2p-group-messaging-system/17092 "2019-10-24T20:35:33Z")

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Hi guys, I would like to make some kind of a messaging bot that can send the data gathered from PLC (I have the data already so that's not a problem) however it would need to run inside of a VPN with no internet access,…

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## [How to do complex event processing using node-red](https://discourse.nodered.org/t/how-to-do-complex-event-processing-using-node-red/17085)

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**Author:** [@VIKRAMAS](https://discourse.nodered.org/u/VIKRAMAS)\
**Replies:** 7\
**Last updated:** [24 October 2019 18:03 UTC](https://discourse.nodered.org/t/how-to-do-complex-event-processing-using-node-red/17085 "2019-10-24T18:03:58Z")

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In node-red how can we do complex event processing. I am using node-red-contrib-cep node for complex event processing , is there any alternative or any simple example on this node-red-contrib-cep node only having example…

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## [Access subflow name like an environment variable?](https://discourse.nodered.org/t/access-subflow-name-like-an-environment-variable/17061)

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**Author:** [@Keeper](https://discourse.nodered.org/u/Keeper)\
**Replies:** 3\
**Last updated:** [24 October 2019 15:08 UTC](https://discourse.nodered.org/t/access-subflow-name-like-an-environment-variable/17061 "2019-10-24T15:08:40Z")

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Hello, maybe I'm missing something here... I've created a subflow with environment variables, which I can set when placing the subflow in the mainflow: In this case I can use ${Test} inside the subflow with no proble…

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## [How to msg object from one flow to otherS?](https://discourse.nodered.org/t/how-to-msg-object-from-one-flow-to-others/17090)

<div class="topic-metadata">

**Author:** [@WhiteLion](https://discourse.nodered.org/u/WhiteLion)\
**Replies:** 4\
**Last updated:** [24 October 2019 13:53 UTC](https://discourse.nodered.org/t/how-to-msg-object-from-one-flow-to-others/17090 "2019-10-24T13:53:04Z")

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Hey my friends, I have a message objects (created by pir motion sensors) and want to foraward them to other flows (light switch). My idea was to just take a simple subflow with input and output. But I noticed that the s…

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## [Cannot convert base64 to buffer](https://discourse.nodered.org/t/cannot-convert-base64-to-buffer/17083)

<div class="topic-metadata">

**Author:** [@YT2310](https://discourse.nodered.org/u/YT2310)\
**Replies:** 1\
**Last updated:** [24 October 2019 12:51 UTC](https://discourse.nodered.org/t/cannot-convert-base64-to-buffer/17083 "2019-10-24T12:51:04Z")

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Hey there, I try to convert a base64 encoded picture to buffer but it does not work. I have no idea why it does not work.. normally the second debug should be a buffer? Or am I just to stupid at the moment?

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## [Detect rising and falling value](https://discourse.nodered.org/t/detect-rising-and-falling-value/16820)

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**Author:** [@Rosenkrantz](https://discourse.nodered.org/u/Rosenkrantz)\
**Replies:** 2\
**Last updated:** [24 October 2019 10:38 UTC](https://discourse.nodered.org/t/detect-rising-and-falling-value/16820 "2019-10-24T10:38:26Z")

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Hello forum Is there somebody how know what node I could use to detect these values on the picture below? It's the temperature for my heat pump and the consumption. I wanna get a message so I can stop the heat pump when…

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## [Searching through an array](https://discourse.nodered.org/t/searching-through-an-array/16828)

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**Author:** [@joepierce88](https://discourse.nodered.org/u/joepierce88)\
**Replies:** 3\
**Last updated:** [24 October 2019 10:34 UTC](https://discourse.nodered.org/t/searching-through-an-array/16828 "2019-10-24T10:34:22Z")

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Hi all, I've done some searching through the forum and I can't seem to figure this out. I'm sending an email message to IBM Watson classifier. It is returning an array object with each sentence individually classified. I…

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## [Node-red, MySql, HTML, and javascript in the same project. How can I associate all together?](https://discourse.nodered.org/t/node-red-mysql-html-and-javascript-in-the-same-project-how-can-i-associate-all-together/16723)

<div class="topic-metadata">

**Author:** [@Squirrelbd](https://discourse.nodered.org/u/Squirrelbd)\
**Replies:** 3\
**Last updated:** [24 October 2019 10:31 UTC](https://discourse.nodered.org/t/node-red-mysql-html-and-javascript-in-the-same-project-how-can-i-associate-all-together/16723 "2019-10-24T10:31:54Z")

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Hello, I am pretty much new in this awesome platform and I have developed some small projects using Node-red and MySql Database using dashboard. Currently, I am working with a project where, in a custom HTML webpage, I …

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## [Node-red on ubuntu snap everytime restarting because of exception](https://discourse.nodered.org/t/node-red-on-ubuntu-snap-everytime-restarting-because-of-exception/17077)

<div class="topic-metadata">

**Author:** [@VIKRAMAS](https://discourse.nodered.org/u/VIKRAMAS)\
**Replies:** 1\
**Last updated:** [24 October 2019 09:43 UTC](https://discourse.nodered.org/t/node-red-on-ubuntu-snap-everytime-restarting-because-of-exception/17077 "2019-10-24T09:43:19Z")

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While starting node-red I'm getting below escption and Oct 24 06:58:19 admin node- red.node-red\[9572\]: Welcome to Node-RED Oct 24 06:58:19 admin node-red.node-red\[9572\]: =================== Oct 24 06:58:19 admin node-re…

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