# Latest **URL:** https://discourse.nodered.org/latest.md?page=853 [Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md) **Page:** 854 --- ## [Buttons don't work from other tab?](https://discourse.nodered.org/t/buttons-dont-work-from-other-tab/43127)

**Author:** [@Myslikko](https://discourse.nodered.org/u/Myslikko)\ **Replies:** 0\ **Last updated:** [24 March 2021 14:57 UTC](https://discourse.nodered.org/t/buttons-dont-work-from-other-tab/43127 "2021-03-24T14:57:06Z")

Hello! i'm trying to control ui\_media node from other tab but for some unknown reason it doesn't react to cliks. with inject nodes it works fine. heres the code \[{"id":"fd48e304.074d7","type":"tab","label":"video","di… --- ## [Node-Red CSV double entries](https://discourse.nodered.org/t/node-red-csv-double-entries/43082)

**Author:** [@Eintracht00](https://discourse.nodered.org/u/Eintracht00)\ **Replies:** 6\ **Last updated:** [24 March 2021 11:09 UTC](https://discourse.nodered.org/t/node-red-csv-double-entries/43082 "2021-03-24T11:09:39Z")

Is there a way how i can go sure that i don't get double entries in my CSV. I take data from a sensor every 30 sec, but if nothing changed, I want get a new entry in my CSV. Just if something changed (I get 5 different… --- ## [Node-Red CSV datatype](https://discourse.nodered.org/t/node-red-csv-datatype/43081)

**Author:** [@Eintracht00](https://discourse.nodered.org/u/Eintracht00)\ **Replies:** 6\ **Last updated:** [24 March 2021 10:56 UTC](https://discourse.nodered.org/t/node-red-csv-datatype/43081 "2021-03-24T10:56:25Z")

How can I make that my CSV File that my lines are formatted, because if i get data like "7.2" as float. it makes me in the CSV btw. Excel 7. Feb, because it thinks automatically that its a date --- ## [Found an error in the user guide](https://discourse.nodered.org/t/found-an-error-in-the-user-guide/43113)

**Author:** [@Suurballe](https://discourse.nodered.org/u/Suurballe)\ **Replies:** 1\ **Last updated:** [24 March 2021 10:27 UTC](https://discourse.nodered.org/t/found-an-error-in-the-user-guide/43113 "2021-03-24T10:27:38Z")

Hello, I was sitting and reading through the user-guide on how to write functions in Node-RED and came across a tiny error. I know it is not much at all, but it threw me off when I was reading it. https://nodered.org/d… --- ## [Mysql connection refused](https://discourse.nodered.org/t/mysql-connection-refused/43109)

**Author:** [@Eimerich](https://discourse.nodered.org/u/Eimerich)\ **Replies:** 5\ **Last updated:** [24 March 2021 10:22 UTC](https://discourse.nodered.org/t/mysql-connection-refused/43109 "2021-03-24T10:22:22Z")

Hi there, I've seen that some similar questions have already been replied but didn't seem to clarify my actual problem. The situation so far: We have installed an IOT on our system to monitor the Siemens PLC. When I'm … --- ## [Programming ti MSP430 using MSP-FET and Raspberry pi](https://discourse.nodered.org/t/programming-ti-msp430-using-msp-fet-and-raspberry-pi/39870)

**Author:** [@RaptorUK](https://discourse.nodered.org/u/RaptorUK)\ **Replies:** 1\ **Last updated:** [24 March 2021 10:19 UTC](https://discourse.nodered.org/t/programming-ti-msp430-using-msp-fet-and-raspberry-pi/39870 "2021-03-24T10:19:54Z")

Hi folks, I'll shortly be working on a project which will use Node Red on a Raspberry pi 3B, part of this project will involve using the pi to program (firmware upload) a populated PCB under test. The Micro Controller … --- ## [Why .. "TypeError: Cannot read property 'apply' of undefined"](https://discourse.nodered.org/t/why-typeerror-cannot-read-property-apply-of-undefined/43106)

**Author:** [@12345](https://discourse.nodered.org/u/12345)\ **Replies:** 2\ **Last updated:** [24 March 2021 08:55 UTC](https://discourse.nodered.org/t/why-typeerror-cannot-read-property-apply-of-undefined/43106 "2021-03-24T08:55:40Z")

**Author:** [@OchoijuoO](https://discourse.nodered.org/u/OchoijuoO)\ **Replies:** 3\ **Last updated:** [24 March 2021 08:59 UTC](https://discourse.nodered.org/t/how-to-clear-node-when-i-clicked-f5-refresh/43064 "2021-03-24T08:59:33Z")

When I page out , click 'F5' refresh button, close dashboard page , I want to refresh my node Now, my dashboard page is remained pre-selected values. //selected dropdown values , selected switch.., clicked button , va… --- ## [Issue with filepath to load geometry file inside a function node](https://discourse.nodered.org/t/issue-with-filepath-to-load-geometry-file-inside-a-function-node/42992)

**Author:** [@Dino](https://discourse.nodered.org/u/Dino)\ **Replies:** 7\ **Last updated:** [24 March 2021 07:48 UTC](https://discourse.nodered.org/t/issue-with-filepath-to-load-geometry-file-inside-a-function-node/42992 "2021-03-24T07:48:08Z")

Dear team, Currently trying to visualize a three.js sketch inside a dashboard. This works well thanks to the example : https://flows.nodered.org/flow/079151b53f63261911684acc015f9166 It works fluently and manage to bri… --- ## [How to remove or disable factory default nodes](https://discourse.nodered.org/t/how-to-remove-or-disable-factory-default-nodes/43103)

**Author:** [@cebucul](https://discourse.nodered.org/u/cebucul)\ **Replies:** 1\ **Last updated:** [24 March 2021 07:45 UTC](https://discourse.nodered.org/t/how-to-remove-or-disable-factory-default-nodes/43103 "2021-03-24T07:45:43Z")

Hi, please let me know how could I remove default nodes populated in any fresh installation of node-red. Example network nodes like UDP and TCP. Thanks --- ## [How to pass msg value to switch topic field](https://discourse.nodered.org/t/how-to-pass-msg-value-to-switch-topic-field/43061)

**Author:** [@ddk](https://discourse.nodered.org/u/ddk)\ **Replies:** 3\ **Last updated:** [24 March 2021 01:16 UTC](https://discourse.nodered.org/t/how-to-pass-msg-value-to-switch-topic-field/43061 "2021-03-24T01:16:22Z")

Hi I want to set Topic filed with special expression: {{{msg.prex}}}\_test in the switch node, but it not work. How can I fix it? Thanks!!! \[{"id":"992e19b1.96722","type":"ui\_switch","z":"7c707aa7.c06c4c","name":"loo… --- ## [Linking nodes with wire](https://discourse.nodered.org/t/linking-nodes-with-wire/43097)

**Author:** [@iiot2k](https://discourse.nodered.org/u/iiot2k)\ **Replies:** 3\ **Last updated:** [23 March 2021 23:14 UTC](https://discourse.nodered.org/t/linking-nodes-with-wire/43097 "2021-03-23T23:14:30Z")

I have a question about linking nodes with wires. For example I have three nodes A,B,C and this nodes are linked to node D with wire. Every node has a unique internal id. On node property "wires" of nodes A,B,C are th… --- ## [Getting a disconnected message on Web Apps](https://discourse.nodered.org/t/getting-a-disconnected-message-on-web-apps/43062)

**Author:** [@qawnaoya](https://discourse.nodered.org/u/qawnaoya)\ **Replies:** 2\ **Last updated:** [23 March 2021 21:56 UTC](https://discourse.nodered.org/t/getting-a-disconnected-message-on-web-apps/43062 "2021-03-23T21:56:01Z")

I've built a Web Apps site using Node RED Docker in Microsoft Azure, but I'm frequently getting a disconnected message. Any ideas on how to fix this? Node RED is using the latest image of nodered/node-red on Docker Hub. --- ## [Display image using \template node](https://discourse.nodered.org/t/display-image-using-template-node/43094)

**Author:** [@FatPilot](https://discourse.nodered.org/u/FatPilot)\ **Replies:** 6\ **Last updated:** [23 March 2021 21:24 UTC](https://discourse.nodered.org/t/display-image-using-template-node/43094 "2021-03-23T21:24:59Z")

Hi Everyone, Could someone please tell me what I'm doing wrong. Trying to display an image using the \template node. I'm sure what I've done in the template node is incorrect. Cheers. Paul. \[{"id":"3a1bff0b.55d3c… --- ## [NodeRED Process Crashing](https://discourse.nodered.org/t/nodered-process-crashing/43053)

**Author:** [@bkdfkup](https://discourse.nodered.org/u/bkdfkup)\ **Replies:** 2\ **Last updated:** [23 March 2021 21:05 UTC](https://discourse.nodered.org/t/nodered-process-crashing/43053 "2021-03-23T21:05:57Z")

Hi all. Having an issue where since migrating from an ubuntu-based node-red instance to a Raspbian-based instance, the node-red process is frequently crashing and (as I am running it as a service) is restarting. Due to … --- ## [Node-red performance benchmark](https://discourse.nodered.org/t/node-red-performance-benchmark/43072)

**Author:** [@baoyicai](https://discourse.nodered.org/u/baoyicai)\ **Replies:** 5\ **Last updated:** [23 March 2021 20:58 UTC](https://discourse.nodered.org/t/node-red-performance-benchmark/43072 "2021-03-23T20:58:14Z")

I'm wondering how many concurrent flows can node-red handle? is there any load test? My use case: 1 generate alarm on iot data. like temperature exceed limit, around 10,000 alarms 2. calculate new values based on inp… --- ## [Back-up SQLite Database](https://discourse.nodered.org/t/back-up-sqlite-database/42995)

**Author:** [@Dgillett](https://discourse.nodered.org/u/Dgillett)\ **Replies:** 13\ **Last updated:** [23 March 2021 19:33 UTC](https://discourse.nodered.org/t/back-up-sqlite-database/42995 "2021-03-23T19:33:45Z")

Im working with Node-Red to send MQTT data to a SQLite database and Provide data in an organized manner. My Question, Is their a way to Backup the SQLite database automatically from Node-Red or another way to do it. I'm… --- ## [Save the cumulate data each 8 hours tracking events](https://discourse.nodered.org/t/save-the-cumulate-data-each-8-hours-tracking-events/42855)

**Author:** [@Khaledpro](https://discourse.nodered.org/u/Khaledpro)\ **Replies:** 23\ **Last updated:** [23 March 2021 15:40 UTC](https://discourse.nodered.org/t/save-the-cumulate-data-each-8-hours-tracking-events/42855 "2021-03-23T15:40:49Z")

Hello everyone i want ask if there's someone can help me in node-red flows i have msg.Payload is a counter and i want to save the total of this cumulate for each 8 hours. please any one has an ideas to help me thank yo… --- ## [Scanning android NFC tags without app?](https://discourse.nodered.org/t/scanning-android-nfc-tags-without-app/42818)

**Author:** [@akszyn\_pl](https://discourse.nodered.org/u/akszyn_pl)\ **Replies:** 6\ **Last updated:** [23 March 2021 15:40 UTC](https://discourse.nodered.org/t/scanning-android-nfc-tags-without-app/42818 "2021-03-23T15:40:46Z")

What are the requirements for node red to detect which phone we use to scan the tag? I would like everyone to be able to activate the NFC tag is it someone in the household or someone stranger who scans for the first ti… --- ## [Turn off plug when no much power taken (washmachine)](https://discourse.nodered.org/t/turn-off-plug-when-no-much-power-taken-washmachine/42969)

**Author:** [@undefinedman](https://discourse.nodered.org/u/undefinedman)\ **Replies:** 6\ **Last updated:** [23 March 2021 14:58 UTC](https://discourse.nodered.org/t/turn-off-plug-when-no-much-power-taken-washmachine/42969 "2021-03-23T14:58:55Z")

I am very new to node-red and homeassistant, so far I had no problems with basic setup however this scenario I don't know how to achieve. Basically I have a wash machine and a dryer connected to a smart plug. I thought … --- ## [Parse a random json](https://discourse.nodered.org/t/parse-a-random-json/43085)

**Author:** [@Napster](https://discourse.nodered.org/u/Napster)\ **Replies:** 4\ **Last updated:** [23 March 2021 14:09 UTC](https://discourse.nodered.org/t/parse-a-random-json/43085 "2021-03-23T14:09:46Z")

Hi, When i do a http get from my solaredge system, i get a json array with types and values. But the types are on random object places, how can i parse them ? --- ## [Struggling with exec node](https://discourse.nodered.org/t/struggling-with-exec-node/43080)

**Author:** [@peter\_a](https://discourse.nodered.org/u/peter_a)\ **Replies:** 6\ **Last updated:** [23 March 2021 12:43 UTC](https://discourse.nodered.org/t/struggling-with-exec-node/43080 "2021-03-23T12:43:28Z")

I've been struggling to use the exec node to run a command that will work in a standard linux cli. The command sends a request to a thermostat in my home, and returns a JSON object with the current status of the thermos… --- ## [Dashboard Does Not Always Update Correctly](https://discourse.nodered.org/t/dashboard-does-not-always-update-correctly/43084)

**Author:** [@n61ab](https://discourse.nodered.org/u/n61ab)\ **Replies:** 0\ **Last updated:** [23 March 2021 12:41 UTC](https://discourse.nodered.org/t/dashboard-does-not-always-update-correctly/43084 "2021-03-23T12:41:29Z")

My browser dashboards do not always update correctly. Background colors, and text are often the first to not update, followed by actual values. Happens after a period of proper browser operation, typically takes severa… --- ## [Non linear scale node?](https://discourse.nodered.org/t/non-linear-scale-node/43008)

**Author:** [@dougle03](https://discourse.nodered.org/u/dougle03)\ **Replies:** 14\ **Last updated:** [23 March 2021 12:26 UTC](https://discourse.nodered.org/t/non-linear-scale-node/43008 "2021-03-23T12:26:34Z")

Hi all, I have a sensor that varies it's resistance in response to position. It varies between 0 ohms and 190 ohms in a reasonably straight curve, however the device I'm using to read the resistance is using a voltage d… --- ## [Error: ER\_BAD\_FIELD\_ERROR: Unknown column 'DWD981' in 'field list'](https://discourse.nodered.org/t/error-er-bad-field-error-unknown-column-dwd981-in-field-list/42802)

**Author:** [@med](https://discourse.nodered.org/u/med)\ **Replies:** 7\ **Last updated:** [23 March 2021 11:31 UTC](https://discourse.nodered.org/t/error-er-bad-field-error-unknown-column-dwd981-in-field-list/42802 "2021-03-23T11:31:00Z")

hi guys, I am not that much into SQL and was working on my first project and I had this error, I need your help, please . --- ## [CSV Date Filename and Daily Email](https://discourse.nodered.org/t/csv-date-filename-and-daily-email/7498)

**Author:** [@randolfwenhold](https://discourse.nodered.org/u/randolfwenhold)\ **Replies:** 6\ **Last updated:** [23 March 2021 10:31 UTC](https://discourse.nodered.org/t/csv-date-filename-and-daily-email/7498 "2021-03-23T10:31:10Z")

LHi there, I would like to create a new CSV every day with logged data from a Modbus enabled Energy meter. The Meter is being read via Modbus in a simple Python script that I am running with the exec node. I would like … --- ## [Function for sorting output by input](https://discourse.nodered.org/t/function-for-sorting-output-by-input/43069)

**Author:** [@mocky](https://discourse.nodered.org/u/mocky)\ **Replies:** 1\ **Last updated:** [23 March 2021 09:22 UTC](https://discourse.nodered.org/t/function-for-sorting-output-by-input/43069 "2021-03-23T09:22:18Z")

\*\*Good day We are starting with node red and I would like to ask if anyone could advise me. The point is that I would need a function that would sort my input. Now it does to me that when I send any input 1-4, the out… --- ## [Query SMA Energy Meter / Home Manager by UDP in](https://discourse.nodered.org/t/query-sma-energy-meter-home-manager-by-udp-in/42983)

**Author:** [@Becker](https://discourse.nodered.org/u/Becker)\ **Replies:** 15\ **Last updated:** [23 March 2021 07:17 UTC](https://discourse.nodered.org/t/query-sma-energy-meter-home-manager-by-udp-in/42983 "2021-03-23T07:17:28Z")

Hi, I came across the possibility to query my home manager directly in Node Red with UDP in: \[{"id":"a14c0e39.6a108","type":"udp in","z":"4726af68.c62a98","name":"Home Manager","iface":"","port":"9522","ipv":"udp4","m… --- ## [Setting message payload based on condition](https://discourse.nodered.org/t/setting-message-payload-based-on-condition/43049)

**Author:** [@ajocius](https://discourse.nodered.org/u/ajocius)\ **Replies:** 1\ **Last updated:** [22 March 2021 21:55 UTC](https://discourse.nodered.org/t/setting-message-payload-based-on-condition/43049 "2021-03-22T21:55:49Z")

I am measuring temp diff and saving it to flow context value 'Temp-Diff'. I then would like to use that context value to turn sonoff "on" or "off" by setting message payload accordingly and at a next step sending that m… --- ## [Diff between values](https://discourse.nodered.org/t/diff-between-values/43035)

**Author:** [@ajocius](https://discourse.nodered.org/u/ajocius)\ **Replies:** 4\ **Last updated:** [22 March 2021 21:53 UTC](https://discourse.nodered.org/t/diff-between-values/43035 "2021-03-22T21:53:27Z")

Have following context values: |Temp-Air|4.75| |Temp-Ground|5.9375| I need to calculate diff between them, so I put function : flow.set('Temp-Diff', 'Temp-Air'-'Temp-Ground') Result I got was error message, probab… [Previous page](https://discourse.nodered.org/latest.md?page=852) [Next page](https://discourse.nodered.org/latest.md?page=854)