# General **URL:** https://discourse.nodered.org/c/general/7.md?page=581 [Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md) **Page:** 582 --- ## [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 --- ## [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… --- ## [Set 'undefined' to 0](https://discourse.nodered.org/t/set-undefined-to-0/43044)

**Author:** [@knaxman](https://discourse.nodered.org/u/knaxman)\ **Replies:** 1\ **Last updated:** [22 March 2021 20:51 UTC](https://discourse.nodered.org/t/set-undefined-to-0/43044 "2021-03-22T20:51:19Z")

Hi guys, I just started some days ago with Node-RED. I have maybe a dummy a question. I read via http a XML file from a Converter. During daytime it works but if the converter is hybernating the power value is receive… --- ## [Node RED Website not loading](https://discourse.nodered.org/t/node-red-website-not-loading/43033)

**Author:** [@deactivator](https://discourse.nodered.org/u/deactivator)\ **Replies:** 9\ **Last updated:** [22 March 2021 20:08 UTC](https://discourse.nodered.org/t/node-red-website-not-loading/43033 "2021-03-22T20:08:50Z")

Hello everyone, i am running node-red on my Raspberry Pi 22 Mar 19:32:42 - \[info\] Node-RED Version: v1.2.9 22 Mar 19:32:42 - \[info\] Node.js Version: v12.21.0 22 Mar 19:32:42 - \[info\] Linux 5.4.83-v7+ arm LE 22 Mar … --- ## [Coding suggestion](https://discourse.nodered.org/t/coding-suggestion/43031)

**Author:** [@fmarzocca](https://discourse.nodered.org/u/fmarzocca)\ **Replies:** 4\ **Last updated:** [22 March 2021 19:56 UTC](https://discourse.nodered.org/t/coding-suggestion/43031 "2021-03-22T19:56:45Z")

I need your best advise on finding the most efficient solution to my problem. Problem: I am monitoring an automation bus on which a stream of frames flows. The frames speed can range from 1/second to 15/second. I need t… --- ## [Install node-red-contrib-mijia-filter to nodered](https://discourse.nodered.org/t/install-node-red-contrib-mijia-filter-to-nodered/42971)

**Author:** [@xjust](https://discourse.nodered.org/u/xjust)\ **Replies:** 4\ **Last updated:** [22 March 2021 19:05 UTC](https://discourse.nodered.org/t/install-node-red-contrib-mijia-filter-to-nodered/42971 "2021-03-22T19:05:58Z")

any ideea how to make node-red-contrib-mijia-filter work with nodered again ? its not in the search palletes and i tried npm install node-red-contrib-mijia-filter but it doesnt seem to appear in nodered webpage of the… --- ## [Questions about Raspberry pi ezo sensor flow.(atlas scientific sensor)](https://discourse.nodered.org/t/questions-about-raspberry-pi-ezo-sensor-flow-atlas-scientific-sensor/27091)

**Author:** [@Athurian](https://discourse.nodered.org/u/Athurian)\ **Replies:** 19\ **Last updated:** [22 March 2021 18:59 UTC](https://discourse.nodered.org/t/questions-about-raspberry-pi-ezo-sensor-flow-atlas-scientific-sensor/27091 "2021-03-22T18:59:31Z")

I have even succeeded in loading the current python code from nod red to deebug. I can do this by entering a command in the Raspberry Pi cmd command window. However, I am not sure what to do next in node red. As you c… --- ## [Node-red-contrib-sonos-plus monitor track being played](https://discourse.nodered.org/t/node-red-contrib-sonos-plus-monitor-track-being-played/43025)

**Author:** [@lseg74](https://discourse.nodered.org/u/lseg74)\ **Replies:** 2\ **Last updated:** [22 March 2021 18:33 UTC](https://discourse.nodered.org/t/node-red-contrib-sonos-plus-monitor-track-being-played/43025 "2021-03-22T18:33:43Z")

Hi @hklages, I was wondering if I could monitor which track is being played on a particular sonos (S1). My kids typically are playing story CD's from the music library in the evening. And we typically switch to Radio in … --- ## [List of topic choices in mqtt-in](https://discourse.nodered.org/t/list-of-topic-choices-in-mqtt-in/43001)

**Author:** [@fmarzocca](https://discourse.nodered.org/u/fmarzocca)\ **Replies:** 6\ **Last updated:** [22 March 2021 16:39 UTC](https://discourse.nodered.org/t/list-of-topic-choices-in-mqtt-in/43001 "2021-03-22T16:39:56Z")

I'd like to have a fixed list of available topics for the mqtt-in node. As far as I can see, using a subflow is not option, or maybe I am missing something. In other words, I need that the user - upon deploying the node… [Previous page](https://discourse.nodered.org/c/general/7.md?page=580) [Next page](https://discourse.nodered.org/c/general/7.md?page=582)