# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=865

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

**Page:** 866

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## [Error after upgrading](https://discourse.nodered.org/t/error-after-upgrading/13487)

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**Author:** [@davidcgu](https://discourse.nodered.org/u/davidcgu)\
**Replies:** 20\
**Last updated:** [20 July 2019 16:44 UTC](https://discourse.nodered.org/t/error-after-upgrading/13487 "2019-07-20T16:44:06Z")

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Good afternoon I'm upograding my system to latest versions and have error as follows at start: (node:7539) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 ready listeners added. Use emitter.…

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## [MQTT - Storing data when disconnected](https://discourse.nodered.org/t/mqtt-storing-data-when-disconnected/9306)

<div class="topic-metadata">

**Author:** [@pjp8w](https://discourse.nodered.org/u/pjp8w)\
**Replies:** 14\
**Last updated:** [20 July 2019 13:21 UTC](https://discourse.nodered.org/t/mqtt-storing-data-when-disconnected/9306 "2019-07-20T13:21:34Z")

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My use case is for a mobile device that can go in and out of network coverage. I have a constant data feed from sensors and need the data to backfill/send when network is reconnected. So my MQTT node goes from connected…

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## [Activate / deactivate a node with a dashboard switsch](https://discourse.nodered.org/t/activate-deactivate-a-node-with-a-dashboard-switsch/13481)

<div class="topic-metadata">

**Author:** [@Kiwi\_gamer01](https://discourse.nodered.org/u/Kiwi_gamer01)\
**Replies:** 5\
**Last updated:** [20 July 2019 12:58 UTC](https://discourse.nodered.org/t/activate-deactivate-a-node-with-a-dashboard-switsch/13481 "2019-07-20T12:58:07Z")

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How can I use a dashboard switch to enable or disable a node or program section

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## ["TypeError: Cannot read property '0' of undefined" #444](https://discourse.nodered.org/t/typeerror-cannot-read-property-0-of-undefined-444/13500)

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**Author:** [@farishsn](https://discourse.nodered.org/u/farishsn)\
**Replies:** 3\
**Last updated:** [20 July 2019 07:49 UTC](https://discourse.nodered.org/t/typeerror-cannot-read-property-0-of-undefined-444/13500 "2019-07-20T07:49:39Z")

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I'm very beginner to Node-red and influx db. I was trying to return values from two functions say X & Y msg.payload1, msg.payload2 on to a different function Z which is below, so i can send these values to influx db with…

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## [Wunderground nodes not working](https://discourse.nodered.org/t/wunderground-nodes-not-working/13352)

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**Author:** [@mshaz](https://discourse.nodered.org/u/mshaz)\
**Replies:** 5\
**Last updated:** [19 July 2019 14:49 UTC](https://discourse.nodered.org/t/wunderground-nodes-not-working/13352 "2019-07-19T14:49:27Z")

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Hi , Hope someone can help me. I tried putting in coordinates from WU doesn't work too. The api key is correct. Thank you

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## [Slow down PCA9685 servo](https://discourse.nodered.org/t/slow-down-pca9685-servo/13464)

<div class="topic-metadata">

**Author:** [@mshaz](https://discourse.nodered.org/u/mshaz)\
**Replies:** 2\
**Last updated:** [19 July 2019 09:31 UTC](https://discourse.nodered.org/t/slow-down-pca9685-servo/13464 "2019-07-19T09:31:24Z")

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Hi I need help, I can get the servo running but I need to slow down a bit the rotations. I m making a robot. This was the node that i used. How do i do this in correct way? Below is my flow. Thank you

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## [Problem installing Tellstick Duo on Buster - Fixed](https://discourse.nodered.org/t/problem-installing-tellstick-duo-on-buster-fixed/13443)

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**Author:** [@Mastiff](https://discourse.nodered.org/u/Mastiff)\
**Replies:** 5\
**Last updated:** [19 July 2019 11:28 UTC](https://discourse.nodered.org/t/problem-installing-tellstick-duo-on-buster-fixed/13443 "2019-07-19T11:28:51Z")

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I have a new Pi 4 for parts of my system. I need to install Telldus Tellstick, and I get close, but not quite. Googling didn't turn up anything that worked, I'm probably the fist one trying to install Telldus on Buster. :…

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## [Kalman filter not working](https://discourse.nodered.org/t/kalman-filter-not-working/13468)

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**Author:** [@innotractor](https://discourse.nodered.org/u/innotractor)\
**Replies:** 4\
**Last updated:** [19 July 2019 08:50 UTC](https://discourse.nodered.org/t/kalman-filter-not-working/13468 "2019-07-19T08:50:32Z")

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Hi, The designer is not responding, perhaps somebody has the same experience as I. I am interested in applying the kalman filter to process RSSI values in general. Before coding, I just made the most simple configurat…

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## [SmartPi2 and Wall Sockets](https://discourse.nodered.org/t/smartpi2-and-wall-sockets/13471)

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**Author:** [@Hans](https://discourse.nodered.org/u/Hans)\
**Replies:** 0\
**Last updated:** [19 July 2019 07:23 UTC](https://discourse.nodered.org/t/smartpi2-and-wall-sockets/13471 "2019-07-19T07:23:46Z")

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Hi, Iam planning to use the installed Node-RED on my SmartPi2 Module with an DECT Wall Socket. If the current is negative (more energy is produced than consumed) I would like to use Node-Red to switch on a DECT Socket!…

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## [Node.js - a dumb question (and off topic)](https://discourse.nodered.org/t/node-js-a-dumb-question-and-off-topic/13386)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 5\
**Last updated:** [19 July 2019 04:34 UTC](https://discourse.nodered.org/t/node-js-a-dumb-question-and-off-topic/13386 "2019-07-19T04:34:49Z")

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Yeah, So it has been determined that I have Node.js installed. I'm still coming to grips with where Ubuntu puts its programs, so I am at a loss how to invoke it. So I type node from the cli. How do I exit when done? …

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## [Problem with updating node-red](https://discourse.nodered.org/t/problem-with-updating-node-red/13450)

<div class="topic-metadata">

**Author:** [@mrkurt](https://discourse.nodered.org/u/mrkurt)\
**Replies:** 8\
**Last updated:** [18 July 2019 21:44 UTC](https://discourse.nodered.org/t/problem-with-updating-node-red/13450 "2019-07-18T21:44:06Z")

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When I update node-red to the latest version, an error occurs all the time: npm ERR! code E404 npm ERR! 404 Not Found - GET https://registry.npmjs.org/@node-red%2Fruntime - User not found npm ERR! 404 npm ERR! 404 '@…

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## [Modbus 16bit words to doubleword problems](https://discourse.nodered.org/t/modbus-16bit-words-to-doubleword-problems/13453)

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**Author:** [@pautorras](https://discourse.nodered.org/u/pautorras)\
**Replies:** 4\
**Last updated:** [18 July 2019 18:28 UTC](https://discourse.nodered.org/t/modbus-16bit-words-to-doubleword-problems/13453 "2019-07-18T18:28:19Z")

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Hi Everyone, I'm having problems converting modbus word registers (16 bits) to double (32 bits) format. Modbus RTU Buffered using node-red-contrib-modbus (4.1.3) I've tryed to use this (Buffer) in a function but it's …

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## [Nbrowser How to](https://discourse.nodered.org/t/nbrowser-how-to/13418)

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**Author:** [@jrgcid](https://discourse.nodered.org/u/jrgcid)\
**Replies:** 1\
**Last updated:** [18 July 2019 16:16 UTC](https://discourse.nodered.org/t/nbrowser-how-to/13418 "2019-07-18T16:16:27Z")

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Hi all, I'm trying to figure out how to use nbrowser, node-red-contrib-nbrowser, to automate a login process and task on a website, however I can't understand how interact with the electron browser. I checked the optio…

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## [Set trigger node's delay time from context value](https://discourse.nodered.org/t/set-trigger-nodes-delay-time-from-context-value/13415)

<div class="topic-metadata">

**Author:** [@jovee](https://discourse.nodered.org/u/jovee)\
**Replies:** 8\
**Last updated:** [18 July 2019 15:51 UTC](https://discourse.nodered.org/t/set-trigger-nodes-delay-time-from-context-value/13415 "2019-07-18T15:51:09Z")

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Hi! I'm using a universally-set delay time stored in flow context, which works great with delay nodes as they can be overridden with the msg.delay property, but not so much with the trigger node. I've been trying to wri…

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## [httpStatic and NR Projects](https://discourse.nodered.org/t/httpstatic-and-nr-projects/13391)

<div class="topic-metadata">

**Author:** [@Sineos](https://discourse.nodered.org/u/Sineos)\
**Replies:** 2\
**Last updated:** [18 July 2019 12:58 UTC](https://discourse.nodered.org/t/httpstatic-and-nr-projects/13391 "2019-07-18T12:58:02Z")

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Is it possible to include the files in the httpStatic path in the Project's version control feature?

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## [Video device monitoring - typically wifi ip-cameras](https://discourse.nodered.org/t/video-device-monitoring-typically-wifi-ip-cameras/13425)

<div class="topic-metadata">

**Author:** [@krambriw](https://discourse.nodered.org/u/krambriw)\
**Replies:** 11\
**Last updated:** [18 July 2019 12:29 UTC](https://discourse.nodered.org/t/video-device-monitoring-typically-wifi-ip-cameras/13425 "2019-07-18T12:29:30Z")

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I have a situation maybe familiar to other users of wifi connected ip-cameras. Sometimes the connection to one or more is lost for a shorter or longer period. For various network related reasons. At least this happens to…

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## [Configure Inline Keyboard](https://discourse.nodered.org/t/configure-inline-keyboard/13432)

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**Author:** [@Didi](https://discourse.nodered.org/u/Didi)\
**Replies:** 2\
**Last updated:** [18 July 2019 11:00 UTC](https://discourse.nodered.org/t/configure-inline-keyboard/13432 "2019-07-18T11:00:23Z")

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someone knows how I can configure a flow for a bot where I have the watson assistant of ibm and can be displayed in telegram the buttons (Inline Keyboard)

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## [Html link to local folder in Windows](https://discourse.nodered.org/t/html-link-to-local-folder-in-windows/13426)

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**Author:** [@Nxito](https://discourse.nodered.org/u/Nxito)\
**Replies:** 2\
**Last updated:** [18 July 2019 08:47 UTC](https://discourse.nodered.org/t/html-link-to-local-folder-in-windows/13426 "2019-07-18T08:47:49Z")

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hello forum people, I wanted to know how you can create a link to a local folder on windows using hmtl as the image that I attached (see list of files and be able to download them). I have seen several things like conf…

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## [Array changes after a time](https://discourse.nodered.org/t/array-changes-after-a-time/13414)

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**Author:** [@debouttek](https://discourse.nodered.org/u/debouttek)\
**Replies:** 3\
**Last updated:** [18 July 2019 06:14 UTC](https://discourse.nodered.org/t/array-changes-after-a-time/13414 "2019-07-18T06:14:23Z")

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I'm reading a power consumption device with 2 clamps for solar production and my power consumption. I have good readings and the problem is a array problem. I would like to subtract my Consumption minus solar production…

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## [Projects disabled: git command not found](https://discourse.nodered.org/t/projects-disabled-git-command-not-found/13421)

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**Author:** [@nguyenvudtd](https://discourse.nodered.org/u/nguyenvudtd)\
**Replies:** 1\
**Last updated:** [18 July 2019 06:33 UTC](https://discourse.nodered.org/t/projects-disabled-git-command-not-found/13421 "2019-07-18T06:33:43Z")

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I have install Node-red. it not work. can you help me. editorTheme: { menu: { "menu-item-help": { label: "Node-RED Pi Website", url: "http://nodered.org/docs/hardware/raspberrypi.html" } }, projects: { enabled: tr…

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## [Node-Red mentioned in Control Magazine](https://discourse.nodered.org/t/node-red-mentioned-in-control-magazine/13188)

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**Author:** [@netwingduck](https://discourse.nodered.org/u/netwingduck)\
**Replies:** 11\
**Last updated:** [18 July 2019 06:04 UTC](https://discourse.nodered.org/t/node-red-mentioned-in-control-magazine/13188 "2019-07-18T06:04:33Z")

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I just thought I'd mention it since I didn't already see it mentioned. I work in industrial controls and been using node-red for almost 2 years now. I'am generally alone in this when I talk and work with other control'…

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## [Mqtt connection ..failed](https://discourse.nodered.org/t/mqtt-connection-failed/13419)

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**Author:** [@sofiir](https://discourse.nodered.org/u/sofiir)\
**Replies:** 12\
**Last updated:** [17 July 2019 23:55 UTC](https://discourse.nodered.org/t/mqtt-connection-failed/13419 "2019-07-17T23:55:10Z")

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I want to try this basic ESP8266 MQTT example : I want to publish a msg on Node-red I started mosquitto . But I'm getting this error ,: Anyone have an idea where is the problem please?

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## [String replace - help please](https://discourse.nodered.org/t/string-replace-help-please/13388)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 24\
**Last updated:** [17 July 2019 23:07 UTC](https://discourse.nodered.org/t/string-replace-help-please/13388 "2019-07-17T23:07:43Z")

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(The village idiot is out again) I'm wanting to create a "payload" of the date/time. (Basically a log file name of meaning.) This is the code I have: I'm going to do other things with it, but this is the basic model. …

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## [Using two arrays as lookup tables](https://discourse.nodered.org/t/using-two-arrays-as-lookup-tables/13408)

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**Author:** [@martino\_eb](https://discourse.nodered.org/u/martino_eb)\
**Replies:** 1\
**Last updated:** [17 July 2019 15:13 UTC](https://discourse.nodered.org/t/using-two-arrays-as-lookup-tables/13408 "2019-07-17T15:13:30Z")

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Hi everyone, I am trying to build a flow that allows me to combine data from two different arrays A and B to lookup data in array B and substitute it in A in the right spot: for instance, let's say array A lists people …

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## [Flows have disappeared!](https://discourse.nodered.org/t/flows-have-disappeared/13394)

<div class="topic-metadata">

**Author:** [@hgb1234](https://discourse.nodered.org/u/hgb1234)\
**Replies:** 6\
**Last updated:** [17 July 2019 15:10 UTC](https://discourse.nodered.org/t/flows-have-disappeared/13394 "2019-07-17T15:10:02Z")

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Hi everyone, I have the same problem as a couple of other people I have seen online but haven't had much luck in solving it from reading the previous answers. Suddenly some of my flows have disappeared from the node-red…

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## [Darksky data to Azure IoT hub](https://discourse.nodered.org/t/darksky-data-to-azure-iot-hub/13392)

<div class="topic-metadata">

**Author:** [@mshaz](https://discourse.nodered.org/u/mshaz)\
**Replies:** 2\
**Last updated:** [17 July 2019 14:33 UTC](https://discourse.nodered.org/t/darksky-data-to-azure-iot-hub/13392 "2019-07-17T14:33:19Z")

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Hi How do i add more payloads from Darksky to Azure. I did try adding more change node i.e humidity and it doesn't work. From example it looks like this { "deviceId": "testenode1", "key": "cw3nniq77BbjpOCDLqb7xEFT…

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## [Function node to filter 2 values out](https://discourse.nodered.org/t/function-node-to-filter-2-values-out/13296)

<div class="topic-metadata">

**Author:** [@wsuess](https://discourse.nodered.org/u/wsuess)\
**Replies:** 15\
**Last updated:** [17 July 2019 13:43 UTC](https://discourse.nodered.org/t/function-node-to-filter-2-values-out/13296 "2019-07-17T13:43:20Z")

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Hi to all, How can I filter out 2 quality check (qc) values in my payload? Can I use a function node? T\_Zone\_2\_IST\_Temperatur T\_Zone\_2\_IST\_Temperatur\_qc T\_Zone\_2\_SOLL\_Temperatur T\_Zone\_2\_SOLL\_Temperatur\_qc Many …

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## [Multiple DS18B20 temperature sensor (Tasmota-\>NodeRed-\>InfluxDB))](https://discourse.nodered.org/t/multiple-ds18b20-temperature-sensor-tasmota-nodered-influxdb/13345)

<div class="topic-metadata">

**Author:** [@ventzitt](https://discourse.nodered.org/u/ventzitt)\
**Replies:** 7\
**Last updated:** [17 July 2019 10:14 UTC](https://discourse.nodered.org/t/multiple-ds18b20-temperature-sensor-tasmota-nodered-influxdb/13345 "2019-07-17T10:14:26Z")

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Hi there, I have been tired to resolve an issue for the last couple of days but unfortunately, it seems is over my knowledge so here I am here writing hoping that someone would help me. I have two DS18B20 sensors conne…

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## [Push data in one array](https://discourse.nodered.org/t/push-data-in-one-array/13387)

<div class="topic-metadata">

**Author:** [@Arul-B](https://discourse.nodered.org/u/Arul-B)\
**Replies:** 1\
**Last updated:** [17 July 2019 09:33 UTC](https://discourse.nodered.org/t/push-data-in-one-array/13387 "2019-07-17T09:33:26Z")

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var outputMsg = \[\]; var testName = msg.temperature; var testValue = msg.humidity; while (testName.length \> 0) { name = testName.shift(); value = testValue.shift(); outputMsg.push({name, value}); } return \[ outputMsg…

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## [Sending text to lcd display via i2c](https://discourse.nodered.org/t/sending-text-to-lcd-display-via-i2c/13377)

<div class="topic-metadata">

**Author:** [@hunterhb](https://discourse.nodered.org/u/hunterhb)\
**Replies:** 3\
**Last updated:** [17 July 2019 08:35 UTC](https://discourse.nodered.org/t/sending-text-to-lcd-display-via-i2c/13377 "2019-07-17T08:35:37Z")

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Hello, I'm trying to send text to an lcd display. I installed the driver for the i2c bus manually. The system recognizes the LCD display with 0x27. I also installed the node-red-contrib-i2c V0.5.2. The Scan node eve…

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