# Latest

**URL:** https://discourse.nodered.org/latest.md?page=829

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

**Page:** 830

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## [One github repository for docker-compose application consisting of a node-red application](https://discourse.nodered.org/t/one-github-repository-for-docker-compose-application-consisting-of-a-node-red-application/44523)

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**Author:** [@janvda](https://discourse.nodered.org/u/janvda)\
**Replies:** 8\
**Last updated:** [27 April 2021 12:46 UTC](https://discourse.nodered.org/t/one-github-repository-for-docker-compose-application-consisting-of-a-node-red-application/44523 "2021-04-27T12:46:54Z")

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The context: I am developing a docker compose application consisting of multiple services of which one (or more) service is a node-red application with its specific node-red flows. For development I am using 2 machine…

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## [How to display mqtt image on uibuilder](https://discourse.nodered.org/t/how-to-display-mqtt-image-on-uibuilder/44280)

<div class="topic-metadata">

**Author:** [@noBody](https://discourse.nodered.org/u/noBody)\
**Replies:** 8\
**Last updated:** [27 April 2021 12:57 UTC](https://discourse.nodered.org/t/how-to-display-mqtt-image-on-uibuilder/44280 "2021-04-27T12:57:53Z")

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Hi, I can display images received via MQTT on the dashboard using ui\_template but I have to send the same image to uibuilder page. I am pretty new to js and can't seem to make it work. Can anyone provide a minimal examp…

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## [Zoom iframe possible?](https://discourse.nodered.org/t/zoom-iframe-possible/44743)

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**Author:** [@steinerma](https://discourse.nodered.org/u/steinerma)\
**Replies:** 1\
**Last updated:** [27 April 2021 12:18 UTC](https://discourse.nodered.org/t/zoom-iframe-possible/44743 "2021-04-27T12:18:10Z")

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hi, is there any way to change the zoom level from an iframe window using a variable? So I could change it in the dashboard by a button \[ { "id": "bd76668e.c11518", "type": "function", "z": "…

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## [Containing data in the global and then reusing it](https://discourse.nodered.org/t/containing-data-in-the-global-and-then-reusing-it/44748)

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**Author:** [@jake123](https://discourse.nodered.org/u/jake123)\
**Replies:** 25\
**Last updated:** [27 April 2021 10:20 UTC](https://discourse.nodered.org/t/containing-data-in-the-global-and-then-reusing-it/44748 "2021-04-27T10:20:10Z")

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Hello, I want some data to be contained in global . I want it to be multiple ip adressess that i set manually. And then for each ip address in the global i want to create a option tag. Is that somehow possible and if yes…

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## [Help with JSON Node - Schema validation](https://discourse.nodered.org/t/help-with-json-node-schema-validation/44598)

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**Author:** [@H3llsing](https://discourse.nodered.org/u/H3llsing)\
**Replies:** 8\
**Last updated:** [27 April 2021 10:03 UTC](https://discourse.nodered.org/t/help-with-json-node-schema-validation/44598 "2021-04-27T10:03:28Z")

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Hey together, i wasn't sure if this problem would fit inside https://discourse.nodered.org/t/json-node-schema-validation/2574/13 So i would like to validate json against a json schema. The JSON node comes with the abi…

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## [Door opener control](https://discourse.nodered.org/t/door-opener-control/44385)

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**Author:** [@ajocius](https://discourse.nodered.org/u/ajocius)\
**Replies:** 20\
**Last updated:** [27 April 2021 09:13 UTC](https://discourse.nodered.org/t/door-opener-control/44385 "2021-04-27T09:13:13Z")

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I have door opener that I will put on greenhouse door where I do measure temperature. Total time to fully open door is 48 sec. Thought of setting few steps so that it would open 1/4 way when temp reaches 20C, at 24C woul…

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## [Grove Base Hat and documentation](https://discourse.nodered.org/t/grove-base-hat-and-documentation/44792)

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**Author:** [@bcolias](https://discourse.nodered.org/u/bcolias)\
**Replies:** 1\
**Last updated:** [27 April 2021 09:09 UTC](https://discourse.nodered.org/t/grove-base-hat-and-documentation/44792 "2021-04-27T09:09:15Z")

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I'm trying to use the ADC that is part of Seeed's Grove Base Hat. I'm using an RPI 3+. My simple project is to read the ADC from a soil sensor. The trouble I have is a lack of documentation to refer to. The Hat uses a ST…

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## [Node-Red to join Telegram messages](https://discourse.nodered.org/t/node-red-to-join-telegram-messages/44770)

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**Author:** [@Broutech](https://discourse.nodered.org/u/Broutech)\
**Replies:** 5\
**Last updated:** [27 April 2021 08:48 UTC](https://discourse.nodered.org/t/node-red-to-join-telegram-messages/44770 "2021-04-27T08:48:41Z")

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Good day, Very recently I embarked on finding a way to ping network devices from a database or list. While pinging and a device appears offline, i then wanted to post that "offline" device to Telegram. A member on the …

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## [Node-red-contrib-opcua - connection error: end point must exist](https://discourse.nodered.org/t/node-red-contrib-opcua-connection-error-end-point-must-exist/44741)

<div class="topic-metadata">

**Author:** [@Ashkan](https://discourse.nodered.org/u/Ashkan)\
**Replies:** 10\
**Last updated:** [27 April 2021 08:27 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-connection-error-end-point-must-exist/44741 "2021-04-27T08:27:19Z")

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Hello everyone, i´m trying to connect my PLC over the Client with Node-RED. i added in my Client a Server with the correct address (hopefully :slight\_smile: )but i receive this error " Client node error on: error: \[" …

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## [How to dynamically change the configuration parameter of a mongodb database name](https://discourse.nodered.org/t/how-to-dynamically-change-the-configuration-parameter-of-a-mongodb-database-name/44747)

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**Author:** [@yakupbaltas](https://discourse.nodered.org/u/yakupbaltas)\
**Replies:** 2\
**Last updated:** [27 April 2021 05:43 UTC](https://discourse.nodered.org/t/how-to-dynamically-change-the-configuration-parameter-of-a-mongodb-database-name/44747 "2021-04-27T05:43:20Z")

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How can I change the database name that I get from the user with the node setting. Thank you all.

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## [NodeRed crashing after recent install of (?)zigbee2mqtt(?)](https://discourse.nodered.org/t/nodered-crashing-after-recent-install-of-zigbee2mqtt/44731)

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**Author:** [@GeorgeCastanza](https://discourse.nodered.org/u/GeorgeCastanza)\
**Replies:** 6\
**Last updated:** [27 April 2021 04:22 UTC](https://discourse.nodered.org/t/nodered-crashing-after-recent-install-of-zigbee2mqtt/44731 "2021-04-27T04:22:57Z")

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I've had no issues for years with Node Red. However, it's crashing every couple of hours. I presume it's because of a recent install of zigbee2mqtt.....but not sure. How would I go about debugging. I've been checking th…

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## [Trading robot for forex or stock](https://discourse.nodered.org/t/trading-robot-for-forex-or-stock/42991)

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**Author:** [@anguslou](https://discourse.nodered.org/u/anguslou)\
**Replies:** 9\
**Last updated:** [27 April 2021 03:18 UTC](https://discourse.nodered.org/t/trading-robot-for-forex-or-stock/42991 "2021-04-27T03:18:30Z")

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Recently I am thinking to make a trading robot by Node-Red, surprisingly I can only find very limited information except cryptocurrency trading robot. It seems Node-Red developers are only interested in cryptocurrency bu…

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## [Help in template](https://discourse.nodered.org/t/help-in-template/44784)

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**Author:** [@shin](https://discourse.nodered.org/u/shin)\
**Replies:** 1\
**Last updated:** [27 April 2021 02:40 UTC](https://discourse.nodered.org/t/help-in-template/44784 "2021-04-27T02:40:13Z")

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How to use img tag under template

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## [Uploading file http put request](https://discourse.nodered.org/t/uploading-file-http-put-request/44725)

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**Author:** [@francodutch](https://discourse.nodered.org/u/francodutch)\
**Replies:** 16\
**Last updated:** [26 April 2021 22:39 UTC](https://discourse.nodered.org/t/uploading-file-http-put-request/44725 "2021-04-26T22:39:42Z")

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Hi everyone I need some help after struggling with a topic I'm not familiar with. I want to upload a jpg to a one off signed url which I receive through mqtt. It needs to be through a PUT method. Does anyone have a worki…

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## [Graphs on power bi](https://discourse.nodered.org/t/graphs-on-power-bi/44774)

<div class="topic-metadata">

**Author:** [@Alex95](https://discourse.nodered.org/u/Alex95)\
**Replies:** 1\
**Last updated:** [26 April 2021 20:25 UTC](https://discourse.nodered.org/t/graphs-on-power-bi/44774 "2021-04-26T20:25:46Z")

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Hello everyone. Before i tell you my question i will explain you what i have done so far. So, i have 2 Arduino which communicate via LoRa (because i have added 2 Dragino shields on Arduino). Arduino send the following da…

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## [Form-data multipart-encoded request with pdf file attached into the body](https://discourse.nodered.org/t/form-data-multipart-encoded-request-with-pdf-file-attached-into-the-body/44749)

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**Author:** [@vmoscolini](https://discourse.nodered.org/u/vmoscolini)\
**Replies:** 2\
**Last updated:** [26 April 2021 14:02 UTC](https://discourse.nodered.org/t/form-data-multipart-encoded-request-with-pdf-file-attached-into-the-body/44749 "2021-04-26T14:02:14Z")

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Hi all, Introduction I need to call an API that requires to pass a pdf file into the body as form-data (Multipart-encoded - method POST). Api Details url: https://jurisfai-api.ml/submitfile method: POST body: form-…

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## [Getting weird error](https://discourse.nodered.org/t/getting-weird-error/44700)

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**Author:** [@hoolahoous](https://discourse.nodered.org/u/hoolahoous)\
**Replies:** 6\
**Last updated:** [26 April 2021 19:37 UTC](https://discourse.nodered.org/t/getting-weird-error/44700 "2021-04-26T19:37:31Z")

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I have a flow where I do some HTTP post using axios library (in function node). I attached a debug node to output. Function node makes http call, and sets the result object as payload and sends it forward to debug nod…

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## [ModBus TCP Client Node open many connections!](https://discourse.nodered.org/t/modbus-tcp-client-node-open-many-connections/4146)

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**Author:** [@roberto.zeni](https://discourse.nodered.org/u/roberto.zeni)\
**Replies:** 9\
**Last updated:** [26 April 2021 19:27 UTC](https://discourse.nodered.org/t/modbus-tcp-client-node-open-many-connections/4146 "2021-04-26T19:27:41Z")

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Hi all, I have a PLC that acts as ModBus TCP Server and can manage only 1 ModBus TCP Client. In Node Red I use the "node-red-contrib-modbustcp" library to read and write some tags (Holding register, Coil, etc) and so I…

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## ["Welcome to the Node-RED Dashboard" screen](https://discourse.nodered.org/t/welcome-to-the-node-red-dashboard-screen/44712)

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**Author:** [@Antonio1](https://discourse.nodered.org/u/Antonio1)\
**Replies:** 11\
**Last updated:** [26 April 2021 18:29 UTC](https://discourse.nodered.org/t/welcome-to-the-node-red-dashboard-screen/44712 "2021-04-26T18:29:17Z")

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Hello everybody, i have trying to localhost:1880/ui but i can´t see my demo simple graph, because i see always screen with "Welcome to the Node-RED Dashboard" "Please add some UI nodes to your flow and redeploy." It inst…

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## [Node red telegram polling error](https://discourse.nodered.org/t/node-red-telegram-polling-error/16765)

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**Author:** [@Chenko](https://discourse.nodered.org/u/Chenko)\
**Replies:** 23\
**Last updated:** [26 April 2021 17:30 UTC](https://discourse.nodered.org/t/node-red-telegram-polling-error/16765 "2021-04-26T17:30:00Z")

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Good day I am using node red contrib telegram but i have been stocked at this error "polling error " on the telegram nodes i have looked online but i cant seem to fine a way out please some one help. I have connected i…

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## [Node execution within a subflow](https://discourse.nodered.org/t/node-execution-within-a-subflow/44768)

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**Author:** [@tcr000](https://discourse.nodered.org/u/tcr000)\
**Replies:** 1\
**Last updated:** [26 April 2021 16:03 UTC](https://discourse.nodered.org/t/node-execution-within-a-subflow/44768 "2021-04-26T16:03:39Z")

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I have an application where I need two function nodes to run as close in time as possible. I can place them on the same branch, but isn't it possible that an unrelated flow will execute in between these two nodes? If so,…

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## [Problem with inserting duplicate data MySQL](https://discourse.nodered.org/t/problem-with-inserting-duplicate-data-mysql/44726)

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**Author:** [@fernando](https://discourse.nodered.org/u/fernando)\
**Replies:** 9\
**Last updated:** [26 April 2021 13:01 UTC](https://discourse.nodered.org/t/problem-with-inserting-duplicate-data-mysql/44726 "2021-04-26T13:01:25Z")

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Hi, I have a problem and I don't know how to solve it. I'm trying for day but nothing. I have 2 sensorsand whe they insert data to MySQL, their ID is duplicated but data is not, I mean, one sensor has ID 1 and it has di…

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## [HTTP Endpoint Help](https://discourse.nodered.org/t/http-endpoint-help/44736)

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**Author:** [@fogmajor](https://discourse.nodered.org/u/fogmajor)\
**Replies:** 2\
**Last updated:** [26 April 2021 12:58 UTC](https://discourse.nodered.org/t/http-endpoint-help/44736 "2021-04-26T12:58:06Z")

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Good morning, I wondered if someone would be kind enough to point me in the right direction. I have Node Red running on an Ubuntu server its IP address being 192.168.0.27 I have created a flow that I wish to trigger f…

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## [Happy Function Node](https://discourse.nodered.org/t/happy-function-node/44471)

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**Author:** [@hanc2006](https://discourse.nodered.org/u/hanc2006)\
**Replies:** 7\
**Last updated:** [26 April 2021 12:13 UTC](https://discourse.nodered.org/t/happy-function-node/44471 "2021-04-26T12:13:43Z")

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Hi everybody! Before node-red 1.3 release, it was not easy to use external npm modules directly. For this reason I started develop a new function node, based on the "unsafe-function-node" available for node-red, whic…

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## [Ng-repeat an array of upto 20 objects](https://discourse.nodered.org/t/ng-repeat-an-array-of-upto-20-objects/44735)

<div class="topic-metadata">

**Author:** [@geoseph](https://discourse.nodered.org/u/geoseph)\
**Replies:** 2\
**Last updated:** [26 April 2021 09:52 UTC](https://discourse.nodered.org/t/ng-repeat-an-array-of-upto-20-objects/44735 "2021-04-26T09:52:07Z")

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So I have flow that produces an output on the payload of an array that contains anywhere from 0-20 objects, where each object looks like the following: { "tx\_id":"0x5e7d692de72b3b66b013090618eb4a3c2712ad1592253ce4253…

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## [Npm, versioning and palette manager confusions](https://discourse.nodered.org/t/npm-versioning-and-palette-manager-confusions/44064)

<div class="topic-metadata">

**Author:** [@Colin](https://discourse.nodered.org/u/Colin)\
**Replies:** 75\
**Last updated:** [26 April 2021 09:32 UTC](https://discourse.nodered.org/t/npm-versioning-and-palette-manager-confusions/44064 "2021-04-26T09:32:00Z")

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Using node-red 1.3.1 I find that if I install a node (any node) using npm on the command line then it puts into package.json a dependency of the form "^1.2.3" which means, I believe, that the version must be at least 1.2…

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## [Getting throughput from TP link router](https://discourse.nodered.org/t/getting-throughput-from-tp-link-router/44721)

<div class="topic-metadata">

**Author:** [@leftymuller](https://discourse.nodered.org/u/leftymuller)\
**Replies:** 1\
**Last updated:** [26 April 2021 08:34 UTC](https://discourse.nodered.org/t/getting-throughput-from-tp-link-router/44721 "2021-04-26T08:34:56Z")

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Hello Gents, Can somebody give me some advice how I can get this throughput data from my TP-Link router I looked at SNMP but it has very limited support this is the source from the webpage interface Any advice apprec…

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## [Node for GW Instek](https://discourse.nodered.org/t/node-for-gw-instek/44732)

<div class="topic-metadata">

**Author:** [@Willi](https://discourse.nodered.org/u/Willi)\
**Replies:** 1\
**Last updated:** [26 April 2021 08:30 UTC](https://discourse.nodered.org/t/node-for-gw-instek/44732 "2021-04-26T08:30:07Z")

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Hello, I'm trying to connect to a programmable DC Power Supply from GW Instek (PFR-100 Series). It requires a socket server connection. For example: IP address: 172.25.13.100 port: 2268. The connection with other tools…

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## [Variables to Emoncms](https://discourse.nodered.org/t/variables-to-emoncms/44707)

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**Author:** [@Herbert](https://discourse.nodered.org/u/Herbert)\
**Replies:** 2\
**Last updated:** [26 April 2021 07:04 UTC](https://discourse.nodered.org/t/variables-to-emoncms/44707 "2021-04-26T07:04:13Z")

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Hello all, I need a little help with signals from my battery monitor. There are variables voltage values e.g. 48456 in mV from MQTT. I see the values in Nodered. Now I have to give this value a name as this sequence…

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## [\[Announce\] node-red-contrib-homie-convention](https://discourse.nodered.org/t/announce-node-red-contrib-homie-convention/16329)

<div class="topic-metadata">

**Author:** [@Christian-Me](https://discourse.nodered.org/u/Christian-Me)\
**Replies:** 34\
**Last updated:** [26 April 2021 06:47 UTC](https://discourse.nodered.org/t/announce-node-red-contrib-homie-convention/16329 "2021-04-26T06:47:20Z")

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update to version 0.0.2 Hello, I released version 0.0.2-beta of a custom node to handle communication over mqtt via the homie convention. This is my FIRST custom node! Any feedback appreciated. goals Handling a…

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