# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=824

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

**Page:** 825

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## [Persistent SSH Node](https://discourse.nodered.org/t/persistent-ssh-node/4365)

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**Author:** [@stbluesrul](https://discourse.nodered.org/u/stbluesrul)\
**Replies:** 6\
**Last updated:** [21 November 2019 23:11 UTC](https://discourse.nodered.org/t/persistent-ssh-node/4365 "2019-11-21T23:11:07Z")

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Is there something like a persistent SSH node available? I'm hoping it can behave like this: when Node-RED starts up or Deploy is pushed I'm hoping it can connect and then wait for input. Likewise, anything that is re…

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## [How to seperate payload\_fields into two topic in 'MQTT IN' node](https://discourse.nodered.org/t/how-to-seperate-payload-fields-into-two-topic-in-mqtt-in-node/18211)

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**Author:** [@molly](https://discourse.nodered.org/u/molly)\
**Replies:** 2\
**Last updated:** [21 November 2019 22:45 UTC](https://discourse.nodered.org/t/how-to-seperate-payload-fields-into-two-topic-in-mqtt-in-node/18211 "2019-11-21T22:45:11Z")

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I have already made two signals humidity and light shown in payload\_fields in debug message, how can I seperate them into two independent value or two topics? Because after the MQTT IN node, I need to display two signals…

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## [Pls help: Node Red will not start / Backups seems to be damaged](https://discourse.nodered.org/t/pls-help-node-red-will-not-start-backups-seems-to-be-damaged/18172)

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**Author:** [@WhiteLion](https://discourse.nodered.org/u/WhiteLion)\
**Replies:** 11\
**Last updated:** [21 November 2019 17:48 UTC](https://discourse.nodered.org/t/pls-help-node-red-will-not-start-backups-seems-to-be-damaged/18172 "2019-11-21T17:48:37Z")

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I ve a big big problem. After I added a big flow my node red (ioBroker implemented but never used) lost connection. Now it does not start anymore. I ve no idea where to find the error logs. My backup stick seems to be …

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## [TypeError: Cannot read property '0' of undefined](https://discourse.nodered.org/t/typeerror-cannot-read-property-0-of-undefined/18225)

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**Author:** [@varun](https://discourse.nodered.org/u/varun)\
**Replies:** 20\
**Last updated:** [21 November 2019 16:05 UTC](https://discourse.nodered.org/t/typeerror-cannot-read-property-0-of-undefined/18225 "2019-11-21T16:05:01Z")

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I am getting a type error - Cannot read property '0' of undefined in my function node. I am not sure what is exactly the mistake. I have attached my flow. Can someone suggest me what should i do to solve the error. I am …

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## [Modem AT commands](https://discourse.nodered.org/t/modem-at-commands/18203)

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**Author:** [@New2Node](https://discourse.nodered.org/u/New2Node)\
**Replies:** 4\
**Last updated:** [20 November 2019 19:55 UTC](https://discourse.nodered.org/t/modem-at-commands/18203 "2019-11-20T19:55:39Z")

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Hi, I have a LTE CAT1 PI hat (Seeed) on my Rpi and I’m trying to use node-red to configure the APN using AT commands and the UART connection. If I send: \*\*msg.payload=“AT/r/n”; \*\* return msg; I get “OK” from the mode…

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## [Command a VSD with Node-RED](https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661)

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**Author:** [@iridiu](https://discourse.nodered.org/u/iridiu)\
**Replies:** 1\
**Last updated:** [20 November 2019 19:41 UTC](https://discourse.nodered.org/t/command-a-vsd-with-node-red/1661 "2019-11-20T19:41:31Z")

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Dear members of Node-RED community, I'm a beginner in terms of Node-RED and ModBus protocol, for this reason I can not find a solution to control a variable speed drive from Node-RED via ModBus TCP. The VSD is an Schneid…

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## [Disable when a certain message arrives](https://discourse.nodered.org/t/disable-when-a-certain-message-arrives/17501)

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**Author:** [@4integration](https://discourse.nodered.org/u/4integration)\
**Replies:** 5\
**Last updated:** [20 November 2019 19:07 UTC](https://discourse.nodered.org/t/disable-when-a-certain-message-arrives/17501 "2019-11-20T19:07:59Z")

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HI, I have a Node-RED flow deployed looking like below On the HTTP input node I receives triggers from my video surveillance system (motion detection) and to notify activity via pushover or email depending on the que…

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## [Convert json from api to graphite](https://discourse.nodered.org/t/convert-json-from-api-to-graphite/18169)

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**Author:** [@wolfman2g1](https://discourse.nodered.org/u/wolfman2g1)\
**Replies:** 11\
**Last updated:** [20 November 2019 17:46 UTC](https://discourse.nodered.org/t/convert-json-from-api-to-graphite/18169 "2019-11-20T17:46:23Z")

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Hello, I'm new to node red, I'm working on a project where I get data from an api, do some filtering with a function. Now i'd like to save it to graphite. I installed the graphite plugin but the data is rejected. I know…

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## [Node-RED under termux and Android](https://discourse.nodered.org/t/node-red-under-termux-and-android/18171)

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**Author:** [@baqwas](https://discourse.nodered.org/u/baqwas)\
**Replies:** 6\
**Last updated:** [20 November 2019 16:34 UTC](https://discourse.nodered.org/t/node-red-under-termux-and-android/18171 "2019-11-20T16:34:43Z")

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Hello, Apologies in advance for a truly beginner question but I haven't found any termux specific doc on UI settings to construct flows. After installing the Node-RED package under termux (aarch64 Android Linux 4.4.177…

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## [Read Dynamic nodes from OPC UA Server](https://discourse.nodered.org/t/read-dynamic-nodes-from-opc-ua-server/18192)

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**Author:** [@Piyush](https://discourse.nodered.org/u/Piyush)\
**Replies:** 0\
**Last updated:** [20 November 2019 11:03 UTC](https://discourse.nodered.org/t/read-dynamic-nodes-from-opc-ua-server/18192 "2019-11-20T11:03:15Z")

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I've an OPC UA Server where the nodes are generated dynamically each time the server is restarted. Due to this index of the nodes keeps on changing. Also the nodes are only defined with numeric indices and not via string…

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## [Matplot using on Node-RED](https://discourse.nodered.org/t/matplot-using-on-node-red/18162)

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**Author:** [@ALOKA1432](https://discourse.nodered.org/u/ALOKA1432)\
**Replies:** 27\
**Last updated:** [20 November 2019 10:51 UTC](https://discourse.nodered.org/t/matplot-using-on-node-red/18162 "2019-11-20T10:51:15Z")

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Hi all, Is it possible to do matplot on NodeRED dashboard using pythonshell or exec node ?

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## [Unable to install node red using docker command](https://discourse.nodered.org/t/unable-to-install-node-red-using-docker-command/18147)

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**Author:** [@dineshpittala](https://discourse.nodered.org/u/dineshpittala)\
**Replies:** 6\
**Last updated:** [20 November 2019 10:34 UTC](https://discourse.nodered.org/t/unable-to-install-node-red-using-docker-command/18147 "2019-11-20T10:34:59Z")

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linux@linux-VirtualBox:~/node$ linux@linux-VirtualBox:~/node$ docker run -it -p 1880:1880 --name mynodered\*\* nodered/node-red fs.js:114 throw err; ^ Error: EACCES: permission denied, open '/usr/local/lib/node\_module…

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## [Reading GPS and Scan for Ble on Node-red](https://discourse.nodered.org/t/reading-gps-and-scan-for-ble-on-node-red/18137)

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**Author:** [@hazee007](https://discourse.nodered.org/u/hazee007)\
**Replies:** 4\
**Last updated:** [20 November 2019 10:12 UTC](https://discourse.nodered.org/t/reading-gps-and-scan-for-ble-on-node-red/18137 "2019-11-20T10:12:28Z")

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I have a project where i want a gps module connect to raspberry pi and read the lat long on node-red, also i want to do a ble scan and get the result on node-red also, the issue here is i cant read the gps data coming f…

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## [Multitech Conduit - cannot install node-red-contrib-ttn](https://discourse.nodered.org/t/multitech-conduit-cannot-install-node-red-contrib-ttn/18177)

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**Author:** [@ScheepersJohan](https://discourse.nodered.org/u/ScheepersJohan)\
**Replies:** 6\
**Last updated:** [20 November 2019 08:47 UTC](https://discourse.nodered.org/t/multitech-conduit-cannot-install-node-red-contrib-ttn/18177 "2019-11-20T08:47:21Z")

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Hi, Trying to install node-red-contrib-ttn on a Multitech Conduit - running 5.0.0-AEP via the Manage palette It keeps throwing the below errors - Error: Command failed: npm WARN addRemoteGit Error: not found: git npm …

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## [Read data from two different csv files as input for a function node](https://discourse.nodered.org/t/read-data-from-two-different-csv-files-as-input-for-a-function-node/17933)

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**Author:** [@varun](https://discourse.nodered.org/u/varun)\
**Replies:** 9\
**Last updated:** [20 November 2019 08:36 UTC](https://discourse.nodered.org/t/read-data-from-two-different-csv-files-as-input-for-a-function-node/17933 "2019-11-20T08:36:23Z")

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I have a function node which has a few variables. They have to be altered depending on the useage. Therefore i dont anyone to alter the Code .Instead I want to read these values from csv file so that changes can easily b…

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## [Movie light automation](https://discourse.nodered.org/t/movie-light-automation/18115)

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**Author:** [@cranks](https://discourse.nodered.org/u/cranks)\
**Replies:** 5\
**Last updated:** [20 November 2019 05:04 UTC](https://discourse.nodered.org/t/movie-light-automation/18115 "2019-11-20T05:04:56Z")

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Previously I had Home Assistant installed with NR on a Pi3, but it was becoming increasingly sluggish and it was suggested I install NR as a standalone product on my Pi. I've done this and have set up a simple light sche…

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## [Change Node: JSONata misbehaving/expression disappearing intermittently](https://discourse.nodered.org/t/change-node-jsonata-misbehaving-expression-disappearing-intermittently/18152)

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**Author:** [@tony-shannon](https://discourse.nodered.org/u/tony-shannon)\
**Replies:** 11\
**Last updated:** [19 November 2019 23:00 UTC](https://discourse.nodered.org/t/change-node-jsonata-misbehaving-expression-disappearing-intermittently/18152 "2019-11-19T23:00:37Z")

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For some strange reason while I'm editing flows including Change Node with JSONata expressions, every so often the JSONata expression is disappearing completely from the Node. Its hard to reproduce, but its happening af…

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## [Within flow POST to external REST API using JWT authentication](https://discourse.nodered.org/t/within-flow-post-to-external-rest-api-using-jwt-authentication/17377)

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**Author:** [@Laura](https://discourse.nodered.org/u/Laura)\
**Replies:** 6\
**Last updated:** [19 November 2019 21:39 UTC](https://discourse.nodered.org/t/within-flow-post-to-external-rest-api-using-jwt-authentication/17377 "2019-11-19T21:39:39Z")

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Hi there, I have a flow that catches json payloads, splits them in seperate key-value pairs. What I would like to do now is to forward the new json by HTTP POST to a REST API that uses JWT authentication. I managed to…

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## [Questions about some functions](https://discourse.nodered.org/t/questions-about-some-functions/18157)

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**Author:** [@Hubertus3th](https://discourse.nodered.org/u/Hubertus3th)\
**Replies:** 3\
**Last updated:** [19 November 2019 21:27 UTC](https://discourse.nodered.org/t/questions-about-some-functions/18157 "2019-11-19T21:27:32Z")

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Hey Guys i have some questions about my programming skills. Please don´t delete my post i´m new to programming with java and node red. Temp: \[{"id":"1fbb0938.77cf67","type":"function","z":"56d57d0c.f202b4","name":"Tempe…

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## [Array within an object](https://discourse.nodered.org/t/array-within-an-object/18051)

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**Author:** [@scoobyluke](https://discourse.nodered.org/u/scoobyluke)\
**Replies:** 6\
**Last updated:** [19 November 2019 21:21 UTC](https://discourse.nodered.org/t/array-within-an-object/18051 "2019-11-19T21:21:15Z")

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Evening All. A friend suggested I might want to use Node-Red as a solution to problem i'm having but as i'm new to Node-Red, I haven't got much of a clue what i'm doing with it! We use an online quoting tool called Quot…

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## [Injecting data & timestamp into chart](https://discourse.nodered.org/t/injecting-data-timestamp-into-chart/18164)

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**Author:** [@forrest.gates](https://discourse.nodered.org/u/forrest.gates)\
**Replies:** 1\
**Last updated:** [19 November 2019 21:16 UTC](https://discourse.nodered.org/t/injecting-data-timestamp-into-chart/18164 "2019-11-19T21:16:00Z")

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Hi there, I am attempting to inject a set a data that i received from my WatsonIoT Device and putting it into a continuing chart for display. To make it easier for a test run, I chopped off all but one specific set of d…

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## [Join Node Confusion](https://discourse.nodered.org/t/join-node-confusion/18163)

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**Author:** [@rlongfield](https://discourse.nodered.org/u/rlongfield)\
**Replies:** 2\
**Last updated:** [19 November 2019 20:23 UTC](https://discourse.nodered.org/t/join-node-confusion/18163 "2019-11-19T20:23:32Z")

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I am trying to combine the payload of a number of different nodes into a single payload. I am able to get 2 payloads to combine in the proper order but when I add a 3rd or more nodes the order is scrambled. I did notic…

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## [Node-red-contrib-spreadsheet-in capacity problem](https://discourse.nodered.org/t/node-red-contrib-spreadsheet-in-capacity-problem/18121)

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**Author:** [@kauan-AF](https://discourse.nodered.org/u/kauan-AF)\
**Replies:** 2\
**Last updated:** [19 November 2019 18:58 UTC](https://discourse.nodered.org/t/node-red-contrib-spreadsheet-in-capacity-problem/18121 "2019-11-19T18:58:26Z")

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Hi, I used node-red-contrib-spreadsheet-in nodes to extract information from an Excel file, but the flow only works with spreadsheets with less than eight thousand cells, and I need one that works with 20 thousand cells…

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## [Node-email wont send message from Rpi](https://discourse.nodered.org/t/node-email-wont-send-message-from-rpi/18158)

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**Author:** [@Martin](https://discourse.nodered.org/u/Martin)\
**Replies:** 0\
**Last updated:** [19 November 2019 18:53 UTC](https://discourse.nodered.org/t/node-email-wont-send-message-from-rpi/18158 "2019-11-19T18:53:56Z")

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Hello Readers,i've bee using node-email with Node-red on Windows 10 to send some files as e-mail's attatchments and it works fine. But now i wanted to use the same node with configuration on raspbian and it didn't work …

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## [Node red RAM usage limit](https://discourse.nodered.org/t/node-red-ram-usage-limit/18150)

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**Author:** [@Henjoe](https://discourse.nodered.org/u/Henjoe)\
**Replies:** 2\
**Last updated:** [19 November 2019 15:00 UTC](https://discourse.nodered.org/t/node-red-ram-usage-limit/18150 "2019-11-19T15:00:06Z")

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I just saw in some forums that node red server only uses 512mb of RAM of your hardware. Is it true? What if I have 16gb of RAM, will it be possible that 8gb of it are dedicated for Nodered server? If yes.. how am I going…

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## [Node red retriggers at state change](https://discourse.nodered.org/t/node-red-retriggers-at-state-change/18144)

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**Author:** [@colint](https://discourse.nodered.org/u/colint)\
**Replies:** 2\
**Last updated:** [19 November 2019 12:24 UTC](https://discourse.nodered.org/t/node-red-retriggers-at-state-change/18144 "2019-11-19T12:24:14Z")

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Hello all, My name is Colin and i am new at this forum. I am using Node Red on a raspberry pi 2b for restarting domoticz or rebooting the pi with hardwired push buttons. Only i have a problem, when de state of the pin…

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## [Using python and raspberry with node red and using MQTT](https://discourse.nodered.org/t/using-python-and-raspberry-with-node-red-and-using-mqtt/18139)

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**Author:** [@mirou\_IoT](https://discourse.nodered.org/u/mirou_IoT)\
**Replies:** 10\
**Last updated:** [19 November 2019 11:43 UTC](https://discourse.nodered.org/t/using-python-and-raspberry-with-node-red-and-using-mqtt/18139 "2019-11-19T11:43:26Z")

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good morning , i need help i want to control solenoid valve 12 v by a raspberry 5 v and use python prog via MQTT and the switch that i will use it to control solenoid valve is in node red dashboard how i can do that p…

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## [Create custom navigation bar from json file on uibuilder](https://discourse.nodered.org/t/create-custom-navigation-bar-from-json-file-on-uibuilder/17595)

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**Author:** [@emerichrv](https://discourse.nodered.org/u/emerichrv)\
**Replies:** 20\
**Last updated:** [19 November 2019 10:50 UTC](https://discourse.nodered.org/t/create-custom-navigation-bar-from-json-file-on-uibuilder/17595 "2019-11-19T10:50:26Z")

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Hi, How can I create an html navigation bar automatically from reading json file wich looks like : { "html": { "menu3": { "sub\_menu3\_1": { "data1": "none", "data2…

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## [Creation of execute resource in LWM2M](https://discourse.nodered.org/t/creation-of-execute-resource-in-lwm2m/18128)

<div class="topic-metadata">

**Author:** [@akhtar321h](https://discourse.nodered.org/u/akhtar321h)\
**Replies:** 9\
**Last updated:** [19 November 2019 10:48 UTC](https://discourse.nodered.org/t/creation-of-execute-resource-in-lwm2m/18128 "2019-11-19T10:48:35Z")

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I want to create execute resource in LWM2M but its not creating. i am creating one object for that i am taking object id 420 and instance id 0 or 1 and resource id like 1,2,3,..... , object is creating on Leshan server b…

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## [Digital Ruler / Linear Displacement Sensor](https://discourse.nodered.org/t/digital-ruler-linear-displacement-sensor/18140)

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**Author:** [@agoralive](https://discourse.nodered.org/u/agoralive)\
**Replies:** 1\
**Last updated:** [19 November 2019 10:28 UTC](https://discourse.nodered.org/t/digital-ruler-linear-displacement-sensor/18140 "2019-11-19T10:28:46Z")

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For a long time Node-Red has been my friends, as things seems to be SO EASY, but I have learned my lesson :frowning: I have bought a Linear Displacement Sensor, and I am able to the readings that I need, but now I want …

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