# Latest

**URL:** https://discourse.nodered.org/latest.md?page=1035

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

**Page:** 1036

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## [Wrong icon when using font-awsome icon?](https://discourse.nodered.org/t/wrong-icon-when-using-font-awsome-icon/30521)

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**Author:** [@Nodi.Rubrum](https://discourse.nodered.org/u/Nodi.Rubrum)\
**Replies:** 15\
**Last updated:** [22 July 2020 14:11 UTC](https://discourse.nodered.org/t/wrong-icon-when-using-font-awsome-icon/30521 "2020-07-22T14:11:32Z")

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In my html file for my custom node... \<script type='text/javascript'\> RED.nodes.registerType('si7021',{ category: 'under construction', color: '#a6bbcf', defaults:…

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## [Using command line access with the Docker install](https://discourse.nodered.org/t/using-command-line-access-with-the-docker-install/30434)

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**Author:** [@MaxVRAM](https://discourse.nodered.org/u/MaxVRAM)\
**Replies:** 10\
**Last updated:** [22 July 2020 13:30 UTC](https://discourse.nodered.org/t/using-command-line-access-with-the-docker-install/30434 "2020-07-22T13:30:41Z")

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I've deployed a Node-RED Docker stack and can't work out how to access the node-red admin hash-pw command. I'm trying to hash a password to put into the settings.json so I can host my deployment for remote access. In th…

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## [How to use the RiveScript node from node-red-contrib-rive](https://discourse.nodered.org/t/how-to-use-the-rivescript-node-from-node-red-contrib-rive/30292)

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**Author:** [@stefan24](https://discourse.nodered.org/u/stefan24)\
**Replies:** 17\
**Last updated:** [22 July 2020 13:43 UTC](https://discourse.nodered.org/t/how-to-use-the-rivescript-node-from-node-red-contrib-rive/30292 "2020-07-22T13:43:22Z")

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I read about RiveScript for using with Telegram bots, which I can use instead of a large switch node. But I have not found, how to send the text from Telegram or any other node to the input of the RiveScript node. I al…

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## [Ubuntu 20.04 Node Red and node-red-contrib-modbus](https://discourse.nodered.org/t/ubuntu-20-04-node-red-and-node-red-contrib-modbus/30547)

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**Author:** [@Kampfwurst](https://discourse.nodered.org/u/Kampfwurst)\
**Replies:** 2\
**Last updated:** [22 July 2020 13:15 UTC](https://discourse.nodered.org/t/ubuntu-20-04-node-red-and-node-red-contrib-modbus/30547 "2020-07-22T13:15:32Z")

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Hi, I would like to install the node-red-contrib-modbus under ubuntu 20.04 and node red 1.0.6. I cant get it work. I get the following error. ----------------------------------------------------------- 2020-07-22T12:3…

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## [Is this no longer valid practice?](https://discourse.nodered.org/t/is-this-no-longer-valid-practice/30517)

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**Author:** [@Nodi.Rubrum](https://discourse.nodered.org/u/Nodi.Rubrum)\
**Replies:** 6\
**Last updated:** [22 July 2020 12:54 UTC](https://discourse.nodered.org/t/is-this-no-longer-valid-practice/30517 "2020-07-22T12:54:38Z")

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In a custom node, on input just as a test... const sleep = require('sleep'); // sleep.sleep(5000); I did load sleep via npm... $ npm list | grep sleep └─┬ sleep@6.3.0 Log shows... 22 Jul 00:21:14 - \[error\] \[si7021:f…

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## [Overlay text onto image](https://discourse.nodered.org/t/overlay-text-onto-image/16011)

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**Author:** [@m\_elias](https://discourse.nodered.org/u/m_elias)\
**Replies:** 5\
**Last updated:** [22 July 2020 12:12 UTC](https://discourse.nodered.org/t/overlay-text-onto-image/16011 "2020-07-22T12:12:22Z")

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I've been unable to find any examples online of how to overlay text onto an image. I'm using a http request node to return a binary buffer from an IP camera. Then I'm formatting the date/time (contrib-moment), setting th…

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## [Using global array variables in template](https://discourse.nodered.org/t/using-global-array-variables-in-template/30461)

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**Author:** [@panepoide](https://discourse.nodered.org/u/panepoide)\
**Replies:** 3\
**Last updated:** [22 July 2020 11:13 UTC](https://discourse.nodered.org/t/using-global-array-variables-in-template/30461 "2020-07-22T11:13:31Z")

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Hi, I have a project where I store some sensor values in an array in order to print in the dashboard. These values come from one single sensor, so the array is some kind of history. Then, in another flow, I would like t…

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## [Flow and global variables inaccessible when using dot notation](https://discourse.nodered.org/t/flow-and-global-variables-inaccessible-when-using-dot-notation/30539)

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**Author:** [@lightbluecrab](https://discourse.nodered.org/u/lightbluecrab)\
**Replies:** 2\
**Last updated:** [22 July 2020 11:08 UTC](https://discourse.nodered.org/t/flow-and-global-variables-inaccessible-when-using-dot-notation/30539 "2020-07-22T11:08:22Z")

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Hello again, I am looking for a way of accessing global/flow variables inside nodes (such as inside the URL of an http-request-node). So I used a change-node to set global.test but it remains "undefined" when I try to a…

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## [Trigger output if value unchanged for X amount of time](https://discourse.nodered.org/t/trigger-output-if-value-unchanged-for-x-amount-of-time/30347)

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**Author:** [@Mobile\_NR\_Env](https://discourse.nodered.org/u/Mobile_NR_Env)\
**Replies:** 4\
**Last updated:** [22 July 2020 09:38 UTC](https://discourse.nodered.org/t/trigger-output-if-value-unchanged-for-x-amount-of-time/30347 "2020-07-22T09:38:16Z")

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Hello! I have a numerical sensor value Node-Red is reading from an MQTT topic. Unfortunately the script writing the MQTT topic freezes at times. This flow needs to be stopped if that happens! I'd like to be able to tr…

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## [Solution for multiple users at the same time](https://discourse.nodered.org/t/solution-for-multiple-users-at-the-same-time/30437)

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**Author:** [@zazas321](https://discourse.nodered.org/u/zazas321)\
**Replies:** 6\
**Last updated:** [22 July 2020 10:11 UTC](https://discourse.nodered.org/t/solution-for-multiple-users-at-the-same-time/30437 "2020-07-22T10:11:31Z")

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Hello. I am making user interface for a pick to light project. I am controlling many ESP32/ESP8266 devices using node-red (reading sensor values,toggling GPIOS, monitoring device state and etc. The problem is that multip…

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## [Node-RED dashboard interfaces - mobile vs tablet](https://discourse.nodered.org/t/node-red-dashboard-interfaces-mobile-vs-tablet/30349)

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**Author:** [@alex88](https://discourse.nodered.org/u/alex88)\
**Replies:** 7\
**Last updated:** [22 July 2020 10:09 UTC](https://discourse.nodered.org/t/node-red-dashboard-interfaces-mobile-vs-tablet/30349 "2020-07-22T10:09:39Z")

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Ok, so I'm most likely using the wrong terminology.... I want to understand how to implement Node-RED in my home across multiple device types: Mobile vs Tablet. I am building Node-RED dashboards to visualise my HA syste…

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## [Efficiently subscribe to multiple MQTT topics using one MQTT node](https://discourse.nodered.org/t/efficiently-subscribe-to-multiple-mqtt-topics-using-one-mqtt-node/30527)

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**Author:** [@zazas321](https://discourse.nodered.org/u/zazas321)\
**Replies:** 6\
**Last updated:** [22 July 2020 09:27 UTC](https://discourse.nodered.org/t/efficiently-subscribe-to-multiple-mqtt-topics-using-one-mqtt-node/30527 "2020-07-22T09:27:02Z")

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Hey. I need to subscribe to multiple MQTT topics using a single MQTT node. Is that a good way to simplify the flow as I do not want to create a MQTT subscribtion node for every remote device that I have. I might have 50…

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## [\[Feature Request\] Disallow incompatible node connections](https://discourse.nodered.org/t/feature-request-disallow-incompatible-node-connections/30514)

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**Author:** [@raid2light](https://discourse.nodered.org/u/raid2light)\
**Replies:** 9\
**Last updated:** [22 July 2020 08:21 UTC](https://discourse.nodered.org/t/feature-request-disallow-incompatible-node-connections/30514 "2020-07-22T08:21:57Z")

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NodeRED currently allows wiring of any node to any other - this can lead to problems if such nodes are not meant to be connected in particular configuration in first place. Sugest adding property for node to define which…

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## [Get all values from dashboard elements at once](https://discourse.nodered.org/t/get-all-values-from-dashboard-elements-at-once/30450)

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**Author:** [@udusa](https://discourse.nodered.org/u/udusa)\
**Replies:** 12\
**Last updated:** [22 July 2020 05:49 UTC](https://discourse.nodered.org/t/get-all-values-from-dashboard-elements-at-once/30450 "2020-07-22T05:49:04Z")

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Hello every one, i am new to node-red, i am trying to get a msg.payload with all dashboard elements values. In particular i have four sliders, once i set one of them to some value i would like to print in debug all four …

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## [I2C 7 Segment HT16K33](https://discourse.nodered.org/t/i2c-7-segment-ht16k33/30436)

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**Author:** [@PommyBitter](https://discourse.nodered.org/u/PommyBitter)\
**Replies:** 1\
**Last updated:** [22 July 2020 02:22 UTC](https://discourse.nodered.org/t/i2c-7-segment-ht16k33/30436 "2020-07-22T02:22:54Z")

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Hello Everyone, I'm a beginner learning mostly by trial and error and I'm really struggling to use a 7 segment LEd display. I've recently bought a adafruit HT16K33 7 segment in the hope of getting it to work as I have h…

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## [Tesseract - How to send input in tesseract node when we have to read data from Image](https://discourse.nodered.org/t/tesseract-how-to-send-input-in-tesseract-node-when-we-have-to-read-data-from-image/30479)

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**Author:** [@anr8115](https://discourse.nodered.org/u/anr8115)\
**Replies:** 1\
**Last updated:** [21 July 2020 21:57 UTC](https://discourse.nodered.org/t/tesseract-how-to-send-input-in-tesseract-node-when-we-have-to-read-data-from-image/30479 "2020-07-21T21:57:04Z")

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I have an image with data in it and iam trying to use tesseract node to read the data. Can you please let me know what should be input (Name ) in tesseract node and also how to load the image file to node-red inorder to …

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## [Problem with OPC UA server](https://discourse.nodered.org/t/problem-with-opc-ua-server/30473)

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**Author:** [@Holko](https://discourse.nodered.org/u/Holko)\
**Replies:** 2\
**Last updated:** [21 July 2020 21:50 UTC](https://discourse.nodered.org/t/problem-with-opc-ua-server/30473 "2020-07-21T21:50:12Z")

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Hello! I'm working on my masters thesis in a local Siemens internship and part of the task is to use an IOT2040 as a sort of "gateway" between an ET200S (standing in for an S7-300) and an OPC UA client - since the forme…

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## [MQTT gif Payload](https://discourse.nodered.org/t/mqtt-gif-payload/30499)

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**Author:** [@gbos3415](https://discourse.nodered.org/u/gbos3415)\
**Replies:** 13\
**Last updated:** [21 July 2020 21:31 UTC](https://discourse.nodered.org/t/mqtt-gif-payload/30499 "2020-07-21T21:31:46Z")

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Hello, So i recently bought Synology NAS where current I'm running my HA and node-red and plus my Synology Survalion system. finally this week I setup the telegram system on my SS and HA and everything is working the on…

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## [Settings file nonexistant after install](https://discourse.nodered.org/t/settings-file-nonexistant-after-install/30506)

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**Author:** [@FrancoisStArnaud](https://discourse.nodered.org/u/FrancoisStArnaud)\
**Replies:** 5\
**Last updated:** [21 July 2020 20:42 UTC](https://discourse.nodered.org/t/settings-file-nonexistant-after-install/30506 "2020-07-21T20:42:13Z")

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Hi, I am new to Node-RED, sorry if this has been answered elsewhere, I couldn't find the answer. So, I just installed Node-Red, following the instructions from the Getting Started page (https://nodered.org/docs/getting-…

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## [Redirect to URL using dashboard button](https://discourse.nodered.org/t/redirect-to-url-using-dashboard-button/30492)

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**Author:** [@lightbluecrab](https://discourse.nodered.org/u/lightbluecrab)\
**Replies:** 1\
**Last updated:** [21 July 2020 20:02 UTC](https://discourse.nodered.org/t/redirect-to-url-using-dashboard-button/30492 "2020-07-21T20:02:40Z")

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Hello everyone, I want to add a button to my node red dashboard that redirects you to an external URL (such as google.com). I read several threads on how to solve that issue, but I would like to use the node-red-dashboa…

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## [Flow to decode binary data and a walk-through on how to install the npm module](https://discourse.nodered.org/t/flow-to-decode-binary-data-and-a-walk-through-on-how-to-install-the-npm-module/5174)

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**Author:** [@Andrei](https://discourse.nodered.org/u/Andrei)\
**Replies:** 12\
**Last updated:** [21 July 2020 19:16 UTC](https://discourse.nodered.org/t/flow-to-decode-binary-data-and-a-walk-through-on-how-to-install-the-npm-module/5174 "2020-07-21T19:16:44Z")

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I just wanted to share a simple way to parse and decode a binary stream of data using the npm module binary-parser-encoder. This is an alternative to the node-red-contrib-binary node 1- Install the module , in my case …

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## [Stop node from initialization?](https://discourse.nodered.org/t/stop-node-from-initialization/30372)

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**Author:** [@Nodi.Rubrum](https://discourse.nodered.org/u/Nodi.Rubrum)\
**Replies:** 9\
**Last updated:** [21 July 2020 17:11 UTC](https://discourse.nodered.org/t/stop-node-from-initialization/30372 "2020-07-21T17:11:04Z")

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I suspect I know the answer, but is there a way to stop a node from initializing its self? Not unless the node developer allows it by design, right? I have a situation where I only want a node to 'initialize' when the …

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## [Need to design aflow that every 30 min bursts X message with a 30ms interval](https://discourse.nodered.org/t/need-to-design-aflow-that-every-30-min-bursts-x-message-with-a-30ms-interval/30486)

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**Author:** [@bioshock2k](https://discourse.nodered.org/u/bioshock2k)\
**Replies:** 10\
**Last updated:** [21 July 2020 16:30 UTC](https://discourse.nodered.org/t/need-to-design-aflow-that-every-30-min-bursts-x-message-with-a-30ms-interval/30486 "2020-07-21T16:30:57Z")

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Hello dear forum users, I am testing a equipment and need to make a flow that every 30 min burst Xmessages i have already saved on a variable in a 30 ms interval between them. I can make one that sends messages every 3…

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## [Connection Lost After Some Time](https://discourse.nodered.org/t/connection-lost-after-some-time/30000)

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**Author:** [@oncdastan](https://discourse.nodered.org/u/oncdastan)\
**Replies:** 55\
**Last updated:** [21 July 2020 16:06 UTC](https://discourse.nodered.org/t/connection-lost-after-some-time/30000 "2020-07-21T16:06:46Z")

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Hi. Project works fine for a while, nearly an hour, then, it says "Connection Lost". I try to deploy again, but it never happens. Says "no response from server". I reboor/shutdown, and I see an empty flow named "Flow 1".…

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## [Node red email send failed](https://discourse.nodered.org/t/node-red-email-send-failed/30483)

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**Author:** [@tadi](https://discourse.nodered.org/u/tadi)\
**Replies:** 4\
**Last updated:** [21 July 2020 15:41 UTC](https://discourse.nodered.org/t/node-red-email-send-failed/30483 "2020-07-21T15:41:23Z")

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I've been trying to send an email using the node-red-node-email but no response anyone could help to fix the issue ?

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## [Using SQLite Data Base for temporary data](https://discourse.nodered.org/t/using-sqlite-data-base-for-temporary-data/30463)

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**Author:** [@e-Duardo](https://discourse.nodered.org/u/e-Duardo)\
**Replies:** 3\
**Last updated:** [21 July 2020 14:59 UTC](https://discourse.nodered.org/t/using-sqlite-data-base-for-temporary-data/30463 "2020-07-21T14:59:36Z")

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I am starting to use SQLite for storing some values from a continuous flow of input data. My purpose is that the data storage is temporary, and I don't want de DB file to grow forever. Is there any SQL command (or any …

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## [Dashboard input for upper and lower threshold hysteresis](https://discourse.nodered.org/t/dashboard-input-for-upper-and-lower-threshold-hysteresis/30420)

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**Author:** [@Dom\_Nate](https://discourse.nodered.org/u/Dom_Nate)\
**Replies:** 12\
**Last updated:** [21 July 2020 14:29 UTC](https://discourse.nodered.org/t/dashboard-input-for-upper-and-lower-threshold-hysteresis/30420 "2020-07-21T14:29:54Z")

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Hi, I am controlling a peltier heating element in conjunction with a thermometer to regulate the temperature of a heat exchanger using node-red-contrib-hysteresis. It works perfectly but it requires the upper and lower …

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## [Failed Serial Transmission Arduino-Node RED: COM4 Access Denied](https://discourse.nodered.org/t/failed-serial-transmission-arduino-node-red-com4-access-denied/30481)

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**Author:** [@MarkParents](https://discourse.nodered.org/u/MarkParents)\
**Replies:** 2\
**Last updated:** [21 July 2020 14:25 UTC](https://discourse.nodered.org/t/failed-serial-transmission-arduino-node-red-com4-access-denied/30481 "2020-07-21T14:25:38Z")

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Hi everyone. I'm struggling with this problem: I have programmed my Arduino Uno for trasmitting via USB Serial communication the temperature measured by a temperature sensor connected to one of the Analog inputs of the A…

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## [Light-scheduler node](https://discourse.nodered.org/t/light-scheduler-node/30470)

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**Author:** [@aabbas](https://discourse.nodered.org/u/aabbas)\
**Replies:** 3\
**Last updated:** [21 July 2020 14:23 UTC](https://discourse.nodered.org/t/light-scheduler-node/30470 "2020-07-21T14:23:37Z")

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Hi, I am using light-scheduler node to turn on/off my lights. It works but I get "Failed to interpret incoming msg.payload. Ignoring it!" instead True and False. Have any idea about this problem? Thank you

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## [Deleting and Creating New Data Files](https://discourse.nodered.org/t/deleting-and-creating-new-data-files/30451)

<div class="topic-metadata">

**Author:** [@edwardr](https://discourse.nodered.org/u/edwardr)\
**Replies:** 11\
**Last updated:** [21 July 2020 13:37 UTC](https://discourse.nodered.org/t/deleting-and-creating-new-data-files/30451 "2020-07-21T13:37:48Z")

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I\`m trying to find a way for data to be written to a file, so that when the file gets too big the file is either, stored, deleted and new file is put in its place? So far Ive found a way to write to a file, however Im u…

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