# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=783

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

**Page:** 784

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## [Use 'Projects' on Mac / Docker with git to transfer to Prod without 'Projects' on RPi](https://discourse.nodered.org/t/use-projects-on-mac-docker-with-git-to-transfer-to-prod-without-projects-on-rpi/22583)

<div class="topic-metadata">

**Author:** [@IoTPlay](https://discourse.nodered.org/u/IoTPlay)\
**Replies:** 11\
**Last updated:** [11 March 2020 22:19 UTC](https://discourse.nodered.org/t/use-projects-on-mac-docker-with-git-to-transfer-to-prod-without-projects-on-rpi/22583 "2020-03-11T22:19:42Z")

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Hi, I develop my flows on Docker for Mac - then push changes to Github. To then bring the latest code onto my production RPi, I open Node-Red Admin, then do - open editor - Project History Tab \> Commit History \> Refresh…

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## [Restore projects](https://discourse.nodered.org/t/restore-projects/22979)

<div class="topic-metadata">

**Author:** [@pvklink](https://discourse.nodered.org/u/pvklink)\
**Replies:** 5\
**Last updated:** [11 March 2020 17:17 UTC](https://discourse.nodered.org/t/restore-projects/22979 "2020-03-11T17:17:24Z")

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Hi, I just installed a new rpi 4b with a fresh copy of the latest node-red on the latest buster. I copied (filecopy) the project folders from my old rpi3b but thats not enough to get the new enviroment fully operation…

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## [Tinkerforge Industrial Dual 0-20mA Bricklet read Data in NodeRed](https://discourse.nodered.org/t/tinkerforge-industrial-dual-0-20ma-bricklet-read-data-in-nodered/22922)

<div class="topic-metadata">

**Author:** [@Bix85](https://discourse.nodered.org/u/Bix85)\
**Replies:** 3\
**Last updated:** [11 March 2020 16:59 UTC](https://discourse.nodered.org/t/tinkerforge-industrial-dual-0-20ma-bricklet-read-data-in-nodered/22922 "2020-03-11T16:59:24Z")

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Hi, I am a new user of Node Red and have not much experience with it. For a project I have a Raspberry Pi with NodeRed installation. Connected to the Pi is a Tinkerforge Masterbricklet that have 2 x Industrial Dual 0-…

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## [Incorrect checksum tcp-client write](https://discourse.nodered.org/t/incorrect-checksum-tcp-client-write/22854)

<div class="topic-metadata">

**Author:** [@Petta](https://discourse.nodered.org/u/Petta)\
**Replies:** 1\
**Last updated:** [11 March 2020 15:46 UTC](https://discourse.nodered.org/t/incorrect-checksum-tcp-client-write/22854 "2020-03-11T15:46:58Z")

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Hi. I have a piece of equipment that sends data and require me to respond with a single 'A' to ack the data and be able to recieve more data. I can send the 'A' triggerd by the incoming datastream but the other end doe…

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## [exchange mild temperature over time](https://discourse.nodered.org/t/exchange-mild-temperature-over-time/22967)

<div class="topic-metadata">

**Author:** [@AveryDawson](https://discourse.nodered.org/u/AveryDawson)\
**Replies:** 1\
**Last updated:** [11 March 2020 15:00 UTC](https://discourse.nodered.org/t/exchange-mild-temperature-over-time/22967 "2020-03-11T15:00:19Z")

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even as i have built an impressive quantity of flows for my clever home, now's the time i want some more brains to assist me :slight\_smile: what i want: exchange the mild temperature of my dwelling room lighting from th…

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## [Switch off relay](https://discourse.nodered.org/t/switch-off-relay/22957)

<div class="topic-metadata">

**Author:** [@Panos](https://discourse.nodered.org/u/Panos)\
**Replies:** 4\
**Last updated:** [11 March 2020 12:39 UTC](https://discourse.nodered.org/t/switch-off-relay/22957 "2020-03-11T12:39:44Z")

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Any help would be appreciated. I am trying to set up a flow for heater control. I want the user to be able to switch on the heater, only when the temperature is bellow the set point and the heater to switch off when the …

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## [PLC password nodered](https://discourse.nodered.org/t/plc-password-nodered/18545)

<div class="topic-metadata">

**Author:** [@pranavthakkar](https://discourse.nodered.org/u/pranavthakkar)\
**Replies:** 1\
**Last updated:** [11 March 2020 12:02 UTC](https://discourse.nodered.org/t/plc-password-nodered/18545 "2020-03-11T12:02:48Z")

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Hi I have my siemens plc password protected now the s7 communication node is not getting the value from it how can i access it?

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## [Node-red-contrib-tfjs-coco-ssd crashes NR on a Pi Zero W](https://discourse.nodered.org/t/node-red-contrib-tfjs-coco-ssd-crashes-nr-on-a-pi-zero-w/22947)

<div class="topic-metadata">

**Author:** [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Replies:** 5\
**Last updated:** [11 March 2020 09:39 UTC](https://discourse.nodered.org/t/node-red-contrib-tfjs-coco-ssd-crashes-nr-on-a-pi-zero-w/22947 "2020-03-11T09:39:33Z")

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@dceejay I just installed this on a Pi Zero W and when I first deployed it crashes NR with 10 Mar 17:37:12 - \[info\] Stopped modified flows 10 Mar 17:37:12 - \[info\] Starting modified flows Illegal instruction after that…

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## [Contextmenu dynamic item change](https://discourse.nodered.org/t/contextmenu-dynamic-item-change/22954)

<div class="topic-metadata">

**Author:** [@greenembrace](https://discourse.nodered.org/u/greenembrace)\
**Replies:** 2\
**Last updated:** [11 March 2020 07:47 UTC](https://discourse.nodered.org/t/contextmenu-dynamic-item-change/22954 "2020-03-11T07:47:04Z")

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Hi is there away to dynamically enable/disable a menu item or change the menu item text. I'm thinking "light switch" - two items: On and Off one is disabled but changes when the enabled one is selected. Or one item and t…

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## [Install node-red-contrib-s7 with a recent version of node-red](https://discourse.nodered.org/t/install-node-red-contrib-s7-with-a-recent-version-of-node-red/213)

<div class="topic-metadata">

**Author:** [@Gerald\_10](https://discourse.nodered.org/u/Gerald_10)\
**Replies:** 5\
**Last updated:** [11 March 2020 06:31 UTC](https://discourse.nodered.org/t/install-node-red-contrib-s7-with-a-recent-version-of-node-red/213 "2020-03-11T06:31:23Z")

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Hello, I am beginner and I would like to be able to communicate my IOT 2000 with a S7 1500. The version of Node-red that I currently have is V0.16.2 and I can not inst Here is what I will mainly like to do: 1) Update …

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## [Does anyone know how to do Modbus tcp to Javascript conversions?](https://discourse.nodered.org/t/does-anyone-know-how-to-do-modbus-tcp-to-javascript-conversions/22902)

<div class="topic-metadata">

**Author:** [@Jude.Robise](https://discourse.nodered.org/u/Jude.Robise)\
**Replies:** 10\
**Last updated:** [11 March 2020 05:50 UTC](https://discourse.nodered.org/t/does-anyone-know-how-to-do-modbus-tcp-to-javascript-conversions/22902 "2020-03-11T05:50:03Z")

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Hey all, I just wanna read floating point data from modbus tcp. Therefore I wanna convert modbus tcp all formats to Javascript using node red function node. Currently I can read only 32 bit float - little endian byte sw…

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## [Subflow - extract value from json](https://discourse.nodered.org/t/subflow-extract-value-from-json/22932)

<div class="topic-metadata">

**Author:** [@AungKL](https://discourse.nodered.org/u/AungKL)\
**Replies:** 3\
**Last updated:** [11 March 2020 03:33 UTC](https://discourse.nodered.org/t/subflow-extract-value-from-json/22932 "2020-03-11T03:33:41Z")

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Hello, I'm a beginner to node red. I'm trying to create subflow and its environment variables. I have problem with extracting value from json payload. The flow is as follow: \[{"id":"9b706329.bc293","type":"subflow","na…

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## [How to extract values from an Object?](https://discourse.nodered.org/t/how-to-extract-values-from-an-object/22944)

<div class="topic-metadata">

**Author:** [@Golonder](https://discourse.nodered.org/u/Golonder)\
**Replies:** 3\
**Last updated:** [10 March 2020 23:03 UTC](https://discourse.nodered.org/t/how-to-extract-values-from-an-object/22944 "2020-03-10T23:03:54Z")

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Could you please help me to find out how to get data from an object with variables with special signs ? msg.payload = msg.payload.SDS0X1."PM2.5"; msg.payload = msg.payload.SDS0X1.\[PM2.5\]; msg.payload = msg.payload.SDS0X…

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## [Settings.js - question about "myDeviceName"](https://discourse.nodered.org/t/settings-js-question-about-mydevicename/22924)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 10\
**Last updated:** [10 March 2020 23:01 UTC](https://discourse.nodered.org/t/settings-js-question-about-mydevicename/22924 "2020-03-10T23:01:46Z")

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Alas I am in the fun stage of re-building a machine. I set the computer's name in the settings.js file. Extract: functionGlobalContext: { // os:require('os'), // jfive:require("johnny-five"), …

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## [RasPi NeoPixel problem](https://discourse.nodered.org/t/raspi-neopixel-problem/22950)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 2\
**Last updated:** [10 March 2020 23:00 UTC](https://discourse.nodered.org/t/raspi-neopixel-problem/22950 "2020-03-10T23:00:06Z")

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I probably deserve this, but it has me confused. I killed a machine the other night, and had to rebuild it. It isn't complicated for hardware, but I am getting a strange error. Setup - hardware: RasPi 3b Buster. Neo…

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## [How to install node-red from scratch](https://discourse.nodered.org/t/how-to-install-node-red-from-scratch/22753)

<div class="topic-metadata">

**Author:** [@gbond](https://discourse.nodered.org/u/gbond)\
**Replies:** 42\
**Last updated:** [10 March 2020 22:06 UTC](https://discourse.nodered.org/t/how-to-install-node-red-from-scratch/22753 "2020-03-10T22:06:42Z")

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please can someone give me a basic guide on the correct way to install node-red every time i create a new linux box (ubuntu,zorin etc) I then have rights issue get node-red and npm install from a new installation how s…

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## [How to include git in a Node-RED Docker Instance](https://discourse.nodered.org/t/how-to-include-git-in-a-node-red-docker-instance/22896)

<div class="topic-metadata">

**Author:** [@fissionregalia](https://discourse.nodered.org/u/fissionregalia)\
**Replies:** 6\
**Last updated:** [10 March 2020 22:04 UTC](https://discourse.nodered.org/t/how-to-include-git-in-a-node-red-docker-instance/22896 "2020-03-10T22:04:25Z")

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I'm trying to install node-red-contrib-smartthings node from @otaviojr but am running into some issues. I'm currently running node-red in docker via docker-compose and I can't seem to figure out how to add git after the…

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## [New thing: Flow Inspector](https://discourse.nodered.org/t/new-thing-flow-inspector/20573)

<div class="topic-metadata">

**Author:** [@knolleary](https://discourse.nodered.org/u/knolleary)\
**Replies:** 23\
**Last updated:** [10 March 2020 20:12 UTC](https://discourse.nodered.org/t/new-thing-flow-inspector/20573 "2020-03-10T20:12:46Z")

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We are all familiar with the issue of a flow being shared in the forum without any information about what it contains. It isn't easy to stare at the JSON to figure these things out. In particular, the question over what …

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## [How do I simulate a hexadecimal input to be parsed to string](https://discourse.nodered.org/t/how-do-i-simulate-a-hexadecimal-input-to-be-parsed-to-string/3228)

<div class="topic-metadata">

**Author:** [@quique123](https://discourse.nodered.org/u/quique123)\
**Replies:** 8\
**Last updated:** [10 March 2020 20:06 UTC](https://discourse.nodered.org/t/how-do-i-simulate-a-hexadecimal-input-to-be-parsed-to-string/3228 "2020-03-10T20:06:16Z")

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I am trying to simulate data from a ble device receiving hex data. I need to parse it and display the string. How do I simulate that in node-red? So far I have an inject node, function node and debug node, but what do…

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## [Filter for time](https://discourse.nodered.org/t/filter-for-time/22818)

<div class="topic-metadata">

**Author:** [@Assi](https://discourse.nodered.org/u/Assi)\
**Replies:** 3\
**Last updated:** [10 March 2020 19:44 UTC](https://discourse.nodered.org/t/filter-for-time/22818 "2020-03-10T19:44:15Z")

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Hello, I want to filter messages lets say for 30 minutes. If it comes in before it will be filtered out, the first message that comes after a 30 minute pause shall pass and reset the time again. Is there a library eleme…

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## [Need help with a sub-flow and dates (sorry folks)](https://discourse.nodered.org/t/need-help-with-a-sub-flow-and-dates-sorry-folks/22740)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 45\
**Last updated:** [10 March 2020 19:16 UTC](https://discourse.nodered.org/t/need-help-with-a-sub-flow-and-dates-sorry-folks/22740 "2020-03-10T19:16:20Z")

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Ok, I have shared a "node" (Sub-flow) recently which has three outputs. msg.payload that is suitable for use as a file name. msg.payload that is suitable for use as a path. msg.time which is suitable for use as a file…

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## [Node-red unable to reach localhost:1880](https://discourse.nodered.org/t/node-red-unable-to-reach-localhost-1880/22939)

<div class="topic-metadata">

**Author:** [@bastvdn](https://discourse.nodered.org/u/bastvdn)\
**Replies:** 2\
**Last updated:** [10 March 2020 17:33 UTC](https://discourse.nodered.org/t/node-red-unable-to-reach-localhost-1880/22939 "2020-03-10T17:33:47Z")

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Hello everyone, i'm currently working on a robotic project using node-red and ros, it was perfectly working until yesterday, now i cant even connect to the localhost page even tho the log tells me the nodes are working…

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## [Node-red-node-ui-table finding output of the node](https://discourse.nodered.org/t/node-red-node-ui-table-finding-output-of-the-node/22928)

<div class="topic-metadata">

**Author:** [@Bond](https://discourse.nodered.org/u/Bond)\
**Replies:** 2\
**Last updated:** [10 March 2020 15:38 UTC](https://discourse.nodered.org/t/node-red-node-ui-table-finding-output-of-the-node/22928 "2020-03-10T15:38:42Z")

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Hello everyone, I'm new to node-red. I have an imported example in which the ui-table node has both input and output to be connected to. But in my palette, I only see the ui-table node that only has the input. I'm very…

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## [Influxdb database information being stored?](https://discourse.nodered.org/t/influxdb-database-information-being-stored/22930)

<div class="topic-metadata">

**Author:** [@fjungen](https://discourse.nodered.org/u/fjungen)\
**Replies:** 1\
**Last updated:** [10 March 2020 16:22 UTC](https://discourse.nodered.org/t/influxdb-database-information-being-stored/22930 "2020-03-10T16:22:18Z")

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Hi All, using Node-Red in a docker container and would like to copy my backups (flows, database access information like user and password) into a new build image. It's working for the flows but not for the database infor…

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## [How to manually install a node into the library Android](https://discourse.nodered.org/t/how-to-manually-install-a-node-into-the-library-android/22936)

<div class="topic-metadata">

**Author:** [@bracketmounts](https://discourse.nodered.org/u/bracketmounts)\
**Replies:** 0\
**Last updated:** [10 March 2020 16:19 UTC](https://discourse.nodered.org/t/how-to-manually-install-a-node-into-the-library-android/22936 "2020-03-10T16:19:12Z")

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Hi, I am installing Node Red on an android phone running Android 9. I have all my nodes loaded except Sqlite. I have Sqlite.zip downloaded and it is located at sdcard/download. I am a real novice at anything \*ix and ha…

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## [I can't access flow editor](https://discourse.nodered.org/t/i-cant-access-flow-editor/22863)

<div class="topic-metadata">

**Author:** [@nahuavrilero](https://discourse.nodered.org/u/nahuavrilero)\
**Replies:** 5\
**Last updated:** [10 March 2020 16:09 UTC](https://discourse.nodered.org/t/i-cant-access-flow-editor/22863 "2020-03-10T16:09:12Z")

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Hi, I've been using node red on a raspberry pi. It worked just fine till today. I'm able to access the dashboard, but I can't access the flow editor. Whenever I try to open it, node red restart itself. I'm guessing it'…

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## [Mqtt client and mqtt broker connection](https://discourse.nodered.org/t/mqtt-client-and-mqtt-broker-connection/22868)

<div class="topic-metadata">

**Author:** [@saeed1](https://discourse.nodered.org/u/saeed1)\
**Replies:** 6\
**Last updated:** [10 March 2020 16:06 UTC](https://discourse.nodered.org/t/mqtt-client-and-mqtt-broker-connection/22868 "2020-03-10T16:06:21Z")

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Hi, Case 1: My mqtt Client (Arduino+ethernetshield) and broker (PC) are connected to same netwerk with my home router. mqtt attemps work fine. Case 2: In this case my mqtt Client and mqtt broker are connected to 2 d…

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## [File downloaded on Mac OS](https://discourse.nodered.org/t/file-downloaded-on-mac-os/22833)

<div class="topic-metadata">

**Author:** [@taminhhienmor](https://discourse.nodered.org/u/taminhhienmor)\
**Replies:** 7\
**Last updated:** [9 March 2020 17:43 UTC](https://discourse.nodered.org/t/file-downloaded-on-mac-os/22833 "2020-03-09T17:43:17Z")

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Where can I find file downloaded from node "file" on MAC OS. Thanks you

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## [Multiple readings](https://discourse.nodered.org/t/multiple-readings/22703)

<div class="topic-metadata">

**Author:** [@Beefy\_carrot](https://discourse.nodered.org/u/Beefy_carrot)\
**Replies:** 5\
**Last updated:** [10 March 2020 13:24 UTC](https://discourse.nodered.org/t/multiple-readings/22703 "2020-03-10T13:24:56Z")

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Hi! i am trying to take in readings from a sensor and then send that data over to cloud. this process is fine. But to limit the transactions i want to send 10 readings at a time. I dont completely understand how to do th…

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## [Help why NR isn't starting](https://discourse.nodered.org/t/help-why-nr-isnt-starting/22907)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 10\
**Last updated:** [10 March 2020 10:25 UTC](https://discourse.nodered.org/t/help-why-nr-isnt-starting/22907 "2020-03-10T10:25:30Z")

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Yeah, I'm pushing the friendship with things recently. I was going through updating NR on some machines. Alas one is being annoying - as usual. I'm getting this error when it starts: TypeError: Cannot read property '…

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