# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=795

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

**Page:** 796

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## [Expand Value to 3 digits](https://discourse.nodered.org/t/expand-value-to-3-digits/21690)

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**Author:** [@ebnerjoh](https://discourse.nodered.org/u/ebnerjoh)\
**Replies:** 4\
**Last updated:** [14 February 2020 11:36 UTC](https://discourse.nodered.org/t/expand-value-to-3-digits/21690 "2020-02-14T11:36:55Z")

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Hi, I have a function which delivers me a value from 0.0 to 999.9 e.g.: 8.3, 14.5, 342.9 I need to expand the value before the comma to 3 digits. e.g. 008.3, 014.5, 342.9 How can I do this? Br, Johannes

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## [Serial communication-RS-485 using NODE RED](https://discourse.nodered.org/t/serial-communication-rs-485-using-node-red/8426)

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**Author:** [@Geeta](https://discourse.nodered.org/u/Geeta)\
**Replies:** 4\
**Last updated:** [14 February 2020 04:18 UTC](https://discourse.nodered.org/t/serial-communication-rs-485-using-node-red/8426 "2020-02-14T04:18:54Z")

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Can I get steps for RS-485 communication between Raspberry Pi and Energy Meter using Node Red programming Tool? I have Node Red Tool and USB to Rs-485 conveter.

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## [How do you visualize your Data / Charts?](https://discourse.nodered.org/t/how-do-you-visualize-your-data-charts/21166)

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**Author:** [@Gawan](https://discourse.nodered.org/u/Gawan)\
**Replies:** 9\
**Last updated:** [13 February 2020 22:10 UTC](https://discourse.nodered.org/t/how-do-you-visualize-your-data-charts/21166 "2020-02-13T22:10:58Z")

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Unfortunately the visualisation capabilities of Node-Red are not yet ready to use. No authentication, missing possibility of independent UIs, multi-user functionality, .... What do you use for visualizing your data ? H…

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## [Send simple message as string](https://discourse.nodered.org/t/send-simple-message-as-string/21625)

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**Author:** [@Poodlepapa](https://discourse.nodered.org/u/Poodlepapa)\
**Replies:** 6\
**Last updated:** [13 February 2020 19:21 UTC](https://discourse.nodered.org/t/send-simple-message-as-string/21625 "2020-02-13T19:21:32Z")

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I have a simple message format question. I have set up an inject node to send 1, 2, 3, or 4 as a string. How do I incorporate a node to send those with out using an inject node? It truly is a s simple as sending a 1-4 w…

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## [Wait for the execution of a flow and then continoue another](https://discourse.nodered.org/t/wait-for-the-execution-of-a-flow-and-then-continoue-another/21560)

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**Author:** [@pvklink](https://discourse.nodered.org/u/pvklink)\
**Replies:** 13\
**Last updated:** [13 February 2020 17:40 UTC](https://discourse.nodered.org/t/wait-for-the-execution-of-a-flow-and-then-continoue-another/21560 "2020-02-13T17:40:52Z")

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Hi, I made a flow that streams images from a cam to google nest hub. I use a webserver for publishing the file Each file has a unique name and a prefix off xxx so that the share where these files are on are not synchro…

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## [Ui-table node example](https://discourse.nodered.org/t/ui-table-node-example/21628)

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**Author:** [@NODE777](https://discourse.nodered.org/u/NODE777)\
**Replies:** 3\
**Last updated:** [13 February 2020 16:42 UTC](https://discourse.nodered.org/t/ui-table-node-example/21628 "2020-02-13T16:42:15Z")

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Hi I saw this post https://discourse.nodered.org/t/examples-for-node-red-node-ui-table/14256/17 but I would need something more basic to get started. Would someone give me an example? Thank you in advance.

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## [Node-RED won't run as service Debian 10](https://discourse.nodered.org/t/node-red-wont-run-as-service-debian-10/21558)

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**Author:** [@dtorres](https://discourse.nodered.org/u/dtorres)\
**Replies:** 12\
**Last updated:** [13 February 2020 15:43 UTC](https://discourse.nodered.org/t/node-red-wont-run-as-service-debian-10/21558 "2020-02-13T15:43:45Z")

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Hello all, I installed Node-RED using the script, as I try to set it up to run as service I got an error.

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## [Failed to install node-red-contrib-speaker 0.1.7](https://discourse.nodered.org/t/failed-to-install-node-red-contrib-speaker-0-1-7/21650)

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**Author:** [@maku12](https://discourse.nodered.org/u/maku12)\
**Replies:** 2\
**Last updated:** [13 February 2020 14:28 UTC](https://discourse.nodered.org/t/failed-to-install-node-red-contrib-speaker-0-1-7/21650 "2020-02-13T14:28:56Z")

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Hi, i wanted to install the node node-red-contrib-speaker 0.1.7 but it failed, please help, below there is the log: 2020-02-13T12:17:00.480Z installieren : node-red-contrib-audiostream-to-speaker 1.0.2 2020-02-13T12:…

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## [MQTT is not talking](https://discourse.nodered.org/t/mqtt-is-not-talking/21652)

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**Author:** [@roland.lanz](https://discourse.nodered.org/u/roland.lanz)\
**Replies:** 3\
**Last updated:** [13 February 2020 14:19 UTC](https://discourse.nodered.org/t/mqtt-is-not-talking/21652 "2020-02-13T14:19:33Z")

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I am a beginner and I cant get it to work. I use Home assistant and Node-Red latest version. I got two inject with Topic "light/garage\_out" and Paylod "On" / "Off" connected to one MQTT-out, Server: HA-1@192.168.1.87:18…

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## [Node-red Nora mqtt in](https://discourse.nodered.org/t/node-red-nora-mqtt-in/21640)

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**Author:** [@sniperxnl](https://discourse.nodered.org/u/sniperxnl)\
**Replies:** 6\
**Last updated:** [13 February 2020 14:14 UTC](https://discourse.nodered.org/t/node-red-nora-mqtt-in/21640 "2020-02-13T14:14:07Z")

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Hi Guys, using node-red with Nora, what works awesome with google. Only what i dont get working, i want that google also see that i manual switch the lamp by mqtt So when i place a mqtt before nora node, my lamp goes c…

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## [Nodered Math Handle](https://discourse.nodered.org/t/nodered-math-handle/21617)

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**Author:** [@thalesmaoa](https://discourse.nodered.org/u/thalesmaoa)\
**Replies:** 3\
**Last updated:** [13 February 2020 14:12 UTC](https://discourse.nodered.org/t/nodered-math-handle/21617 "2020-02-13T14:12:39Z")

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Hello, I've been looking over math capability inside NodeRed but can't find a suitable option. I need to perform a cumulative integral. Just want to know total energy generated during the day of PV panels. Can' t find …

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## [Problema com instalar novos NODE](https://discourse.nodered.org/t/problema-com-instalar-novos-node/21647)

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**Author:** [@Cristyofer](https://discourse.nodered.org/u/Cristyofer)\
**Replies:** 1\
**Last updated:** [13 February 2020 12:12 UTC](https://discourse.nodered.org/t/problema-com-instalar-novos-node/21647 "2020-02-13T12:12:08Z")

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Olá, estou com dificuladade em instalar nóvos nodes dentro do ibm, não consigo instalar nenhum nod. 2020

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## [Save an array in OPC-UA Server structure](https://discourse.nodered.org/t/save-an-array-in-opc-ua-server-structure/21648)

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**Author:** [@Federica](https://discourse.nodered.org/u/Federica)\
**Replies:** 0\
**Last updated:** [13 February 2020 12:10 UTC](https://discourse.nodered.org/t/save-an-array-in-opc-ua-server-structure/21648 "2020-02-13T12:10:12Z")

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Hello, I want to create an opc-ua server structure. I used the package'node-red-contrib-iiot-opcua' : I used OPC\_iiot\_Server node to create the server and OPC\_iiot\_ASO to create the folder 'Test1' and the variable 'Torq…

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## [Custom node - waiting for instance to be ready](https://discourse.nodered.org/t/custom-node-waiting-for-instance-to-be-ready/14400)

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**Author:** [@kolban](https://discourse.nodered.org/u/kolban)\
**Replies:** 5\
**Last updated:** [13 February 2020 07:15 UTC](https://discourse.nodered.org/t/custom-node-waiting-for-instance-to-be-ready/14400 "2020-02-13T07:15:53Z")

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I've stumbled across a scenario that I think should be common but reading the docs on custom nodes I'm not seeing any obvious discussion. Imagine I am creating a new node type ... let us call it XXX. To make this work,…

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## [Sqlite INSERT command syntax](https://discourse.nodered.org/t/sqlite-insert-command-syntax/21471)

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**Author:** [@NODE777](https://discourse.nodered.org/u/NODE777)\
**Replies:** 9\
**Last updated:** [13 February 2020 03:21 UTC](https://discourse.nodered.org/t/sqlite-insert-command-syntax/21471 "2020-02-13T03:21:57Z")

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I'm founding difficulties to apply the correct syntax in regarding the INSERT command that can be seen in the following function code. msg = "(UTC, DateTime, hp,lp) values (" + msg.payload + " , " + " datetime " + ",…

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## [Unable to delete unused config nodes](https://discourse.nodered.org/t/unable-to-delete-unused-config-nodes/21579)

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**Author:** [@SteveMann](https://discourse.nodered.org/u/SteveMann)\
**Replies:** 6\
**Last updated:** [13 February 2020 03:21 UTC](https://discourse.nodered.org/t/unable-to-delete-unused-config-nodes/21579 "2020-02-13T03:21:08Z")

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I deleted some unused flows and now when I hit Deploy, I get this: But none of the nodes or flows exist, (Workshop Light was ne of the deleted flows), so there's nothing to delete. I tried deleting .config.json, bu…

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## [Delay Node - Rate Limit, but specific message priority](https://discourse.nodered.org/t/delay-node-rate-limit-but-specific-message-priority/21604)

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**Author:** [@patmann03](https://discourse.nodered.org/u/patmann03)\
**Replies:** 9\
**Last updated:** [12 February 2020 22:42 UTC](https://discourse.nodered.org/t/delay-node-rate-limit-but-specific-message-priority/21604 "2020-02-12T22:42:46Z")

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Not sure if this is possible or not, but I have a lighting controller that I connect and send messages over TCP. It's fairly simple, however, it doesn't handle messages well if they are sent too quickly to the controlle…

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## [A node to query partitioned DB in cloudant](https://discourse.nodered.org/t/a-node-to-query-partitioned-db-in-cloudant/21568)

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**Author:** [@etawyy](https://discourse.nodered.org/u/etawyy)\
**Replies:** 1\
**Last updated:** [12 February 2020 22:00 UTC](https://discourse.nodered.org/t/a-node-to-query-partitioned-db-in-cloudant/21568 "2020-02-12T22:00:59Z")

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I have been using node-red with my IBM cloudant DBs so far. Not partitioned. No problem. With the cloudantPlus nodes. However I'd like to switch to partitioned DB now, to optimize query cost. I think I understood how …

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## [Plot data in a dashboard chart](https://discourse.nodered.org/t/plot-data-in-a-dashboard-chart/21565)

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**Author:** [@fabio](https://discourse.nodered.org/u/fabio)\
**Replies:** 10\
**Last updated:** [12 February 2020 22:00 UTC](https://discourse.nodered.org/t/plot-data-in-a-dashboard-chart/21565 "2020-02-12T22:00:43Z")

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Hi,i'm a novice with nodered. I want to plot the output of my pythonshell (in the image my outputs are "media1","media2",etc..) in a chart of a dashboard. How can i do this operation?

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## [Setting msg.something](https://discourse.nodered.org/t/setting-msg-something/21615)

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**Author:** [@zunder1990](https://discourse.nodered.org/u/zunder1990)\
**Replies:** 4\
**Last updated:** [12 February 2020 20:35 UTC](https://discourse.nodered.org/t/setting-msg-something/21615 "2020-02-12T20:35:55Z")

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I am working on making changes to flows that have no be changed or ran since summer if last year. Back then I had heavily made use of msg.something = something in function nodes. I am changing to make to the code but som…

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## [Node function with 2 msg](https://discourse.nodered.org/t/node-function-with-2-msg/21605)

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**Author:** [@pvklink](https://discourse.nodered.org/u/pvklink)\
**Replies:** 4\
**Last updated:** [12 February 2020 17:23 UTC](https://discourse.nodered.org/t/node-function-with-2-msg/21605 "2020-02-12T17:23:29Z")

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I am playing around with node-red and want to learn more... Problem i cant solve is how to create two msg(msg1 and msg2) in a function This must be the output //input msg for function // test0: "test0" //msg1 // te…

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## [Programmatic MQTT Subscription](https://discourse.nodered.org/t/programmatic-mqtt-subscription/21567)

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**Author:** [@coffeegoat](https://discourse.nodered.org/u/coffeegoat)\
**Replies:** 16\
**Last updated:** [12 February 2020 16:34 UTC](https://discourse.nodered.org/t/programmatic-mqtt-subscription/21567 "2020-02-12T16:34:22Z")

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I've been building a node-red/Raspberry Pi data collection ecosystem based on the idea of independent JSON configuration files and python scripts that are all stored within a git repo. Node red is also running within a …

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## [Deploy failed: {"code":"unexpected\_error","message":"Cannot read property 'rev' of null"}](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602)

<div class="topic-metadata">

**Author:** [@gingerhelp](https://discourse.nodered.org/u/gingerhelp)\
**Replies:** 2\
**Last updated:** [12 February 2020 15:30 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602 "2020-02-12T15:30:28Z")

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Hello, I am working on a storage plugin for Microsoft SQL Server inspired by this project: It was a fairly straight forward translation but I am running into a snag I was hoping somebody could point me in the right d…

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## [Workflow File in node RED](https://discourse.nodered.org/t/workflow-file-in-node-red/21583)

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**Author:** [@issa2020](https://discourse.nodered.org/u/issa2020)\
**Replies:** 4\
**Last updated:** [12 February 2020 14:37 UTC](https://discourse.nodered.org/t/workflow-file-in-node-red/21583 "2020-02-12T14:37:55Z")

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Hello, i m looking for a program to create workflow, what i need : i need scan directory, if a files is putting on this directory, mail is send to user to get is validation of the files, when the user valide the file…

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## [Trouble sending multiple records to InfluxDB via JSON](https://discourse.nodered.org/t/trouble-sending-multiple-records-to-influxdb-via-json/21562)

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**Author:** [@McFeardon](https://discourse.nodered.org/u/McFeardon)\
**Replies:** 12\
**Last updated:** [12 February 2020 14:23 UTC](https://discourse.nodered.org/t/trouble-sending-multiple-records-to-influxdb-via-json/21562 "2020-02-12T14:23:52Z")

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I have been working with Node Red and InfluxDB for only a couple of weeks and have run into some trouble. My PLC sends data via MQTT in CSV format, and I have successfully parsed and injected a single row of data into I…

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## [\[Solved\] Serial node not working in node-red 1.0.2](https://discourse.nodered.org/t/solved-serial-node-not-working-in-node-red-1-0-2/17800)

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**Author:** [@dennishvo](https://discourse.nodered.org/u/dennishvo)\
**Replies:** 21\
**Last updated:** [11 February 2020 23:04 UTC](https://discourse.nodered.org/t/solved-serial-node-not-working-in-node-red-1-0-2/17800 "2020-02-11T23:04:27Z")

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I migrated my flows from node-red 0.17.x to 1.0.2 and my serial node is now behaving strangely. When I boot up the raspberry pi (Linux version 4.19.75-v7+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.2…

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## [Python function](https://discourse.nodered.org/t/python-function/21510)

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**Author:** [@fabio](https://discourse.nodered.org/u/fabio)\
**Replies:** 12\
**Last updated:** [11 February 2020 22:21 UTC](https://discourse.nodered.org/t/python-function/21510 "2020-02-11T22:21:03Z")

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Hi,I have been using nodered for a short time and i have a question about python function. When i insert a python function, in the debug this sentence appears: " s = s.decode(detect\_encoding(s), 'surrogatepass') File "C…

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## [Help with code (Basic)(Solved)](https://discourse.nodered.org/t/help-with-code-basic-solved/21548)

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**Author:** [@Shark\_Polo](https://discourse.nodered.org/u/Shark_Polo)\
**Replies:** 3\
**Last updated:** [11 February 2020 20:13 UTC](https://discourse.nodered.org/t/help-with-code-basic-solved/21548 "2020-02-11T20:13:09Z")

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Hi. My project consist of ESP32s sending sensor data to Node-Red though MQTT and Node-Red send it to Influx. Everything is working fine except when the ESP is off and stop sending data. I would like that the Node-Red…

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## [Node Red integration with Skype](https://discourse.nodered.org/t/node-red-integration-with-skype/13294)

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**Author:** [@kirankumar.gunjalli](https://discourse.nodered.org/u/kirankumar.gunjalli)\
**Replies:** 9\
**Last updated:** [11 February 2020 17:02 UTC](https://discourse.nodered.org/t/node-red-integration-with-skype/13294 "2020-02-11T17:02:00Z")

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Hi Team, We have a requirement to integrate Skype for Business with Node Red. Do we have any built API's for the same? Thanks, Kiran Kumar G

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## [How to install node.js on Raspberry?](https://discourse.nodered.org/t/how-to-install-node-js-on-raspberry/20516)

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**Author:** [@Golonder](https://discourse.nodered.org/u/Golonder)\
**Replies:** 10\
**Last updated:** [11 February 2020 17:00 UTC](https://discourse.nodered.org/t/how-to-install-node-js-on-raspberry/20516 "2020-02-11T17:00:51Z")

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Hi, i would like to manually install node.js. I am told to download the latest armv71 archive and install it. Unfortunately all I get is an error message when I use the given "tar" command: pi@raspberrypi:~ $ wget ht…

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