# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=768

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

**Page:** 769

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## [Server features and blynk](https://discourse.nodered.org/t/server-features-and-blynk/24536)

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**Author:** [@stepic7](https://discourse.nodered.org/u/stepic7)\
**Replies:** 0\
**Last updated:** [9 April 2020 16:39 UTC](https://discourse.nodered.org/t/server-features-and-blynk/24536 "2020-04-09T16:39:40Z")

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Sorry I am new, just trying to choose the IoT instrument I need the questions: Blynk is a user interface to interact with most IoT hardware also through the internet by its Server capabilities Does Node-RED similarly…

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## [Reply on chromecast message](https://discourse.nodered.org/t/reply-on-chromecast-message/24531)

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**Author:** [@Robert\_it](https://discourse.nodered.org/u/Robert_it)\
**Replies:** 0\
**Last updated:** [9 April 2020 15:11 UTC](https://discourse.nodered.org/t/reply-on-chromecast-message/24531 "2020-04-09T15:11:57Z")

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Newbee question I have not been able to find the answer on? I want to send a msg to my chromecast only after it has already spoken another msg. first. The first msg id triggered by a door sensor + 30 sec delay and then …

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## [Syntax for deprecated context.myvar instead of context.set()](https://discourse.nodered.org/t/syntax-for-deprecated-context-myvar-instead-of-context-set/24523)

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**Author:** [@JGKK](https://discourse.nodered.org/u/JGKK)\
**Replies:** 1\
**Last updated:** [9 April 2020 13:52 UTC](https://discourse.nodered.org/t/syntax-for-deprecated-context-myvar-instead-of-context-set/24523 "2020-04-09T13:52:13Z")

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I don't know if im having an especially slow day but I cant figure out the syntax for the "deprecated" method to use and set context variables that was used before context.get(). Why do I need it? Im running into the ci…

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## [Zwave configuration seems to be lost when nodered restart](https://discourse.nodered.org/t/zwave-configuration-seems-to-be-lost-when-nodered-restart/24504)

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**Author:** [@louison](https://discourse.nodered.org/u/louison)\
**Replies:** 1\
**Last updated:** [9 April 2020 13:31 UTC](https://discourse.nodered.org/t/zwave-configuration-seems-to-be-lost-when-nodered-restart/24504 "2020-04-09T13:31:06Z")

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Hello, I'm using node-red-contrib-openzwave to communicate with my zwave sensors and AeotechGen5 Zwave dongle to manage. I'm using this flow below in example: https://flows.nodered.org/flow/41ae75dbfbe6465d5cf40248e250…

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## [Invalid Character in Name](https://discourse.nodered.org/t/invalid-character-in-name/24498)

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**Author:** [@Steven](https://discourse.nodered.org/u/Steven)\
**Replies:** 10\
**Last updated:** [9 April 2020 12:39 UTC](https://discourse.nodered.org/t/invalid-character-in-name/24498 "2020-04-09T12:39:18Z")

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Flow above actually work if using Node-Red in groov EPIC device. But when come to Node-Red in Windows, XML node show "Error:Invalid Character in Name". Why would this happen? It seems like msg.payload is the problem. …

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## [Web form like frontend with CSV export in Node RED](https://discourse.nodered.org/t/web-form-like-frontend-with-csv-export-in-node-red/24514)

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**Author:** [@ICE](https://discourse.nodered.org/u/ICE)\
**Replies:** 4\
**Last updated:** [9 April 2020 12:01 UTC](https://discourse.nodered.org/t/web-form-like-frontend-with-csv-export-in-node-red/24514 "2020-04-09T12:01:18Z")

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Hi all, I use the current quarantine to work with Node RED :slight\_smile: I am planning a demo user frontend. The goal is to simulate a customer order using a simple form, with text fields, dropdown menues and radio bo…

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## [Permissions read should allow "inject" button](https://discourse.nodered.org/t/permissions-read-should-allow-inject-button/24490)

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**Author:** [@aderici](https://discourse.nodered.org/u/aderici)\
**Replies:** 4\
**Last updated:** [9 April 2020 11:54 UTC](https://discourse.nodered.org/t/permissions-read-should-allow-inject-button/24490 "2020-04-09T11:54:25Z")

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as far as i know currently we have \* and read permissions. I would like to keep my flows read only on the remote server, but still allow admin users to be able to "inject" or "debug". is this even possible? best regard…

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## [Mustache Syntax Hell](https://discourse.nodered.org/t/mustache-syntax-hell/24430)

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**Author:** [@rwmingis](https://discourse.nodered.org/u/rwmingis)\
**Replies:** 6\
**Last updated:** [9 April 2020 11:49 UTC](https://discourse.nodered.org/t/mustache-syntax-hell/24430 "2020-04-09T11:49:40Z")

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Hi All, I've been coding for years, but am just getting into Node-RED and Mustache is new to me. Seems like a very powerful tool, but getting the syntax correct for newbies doing trial and error is just insane if it's …

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## [Waiting time function](https://discourse.nodered.org/t/waiting-time-function/24483)

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**Author:** [@mustafa](https://discourse.nodered.org/u/mustafa)\
**Replies:** 9\
**Last updated:** [9 April 2020 11:09 UTC](https://discourse.nodered.org/t/waiting-time-function/24483 "2020-04-09T11:09:21Z")

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Hi I have a project of distance measuring by HCR-04 and the output of this sensor sometime debouching so I want to do two things: first I want when the distance number fall below for example 25 ( better to be adjustab…

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## [How check context exist](https://discourse.nodered.org/t/how-check-context-exist/24515)

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**Author:** [@d0d04m3](https://discourse.nodered.org/u/d0d04m3)\
**Replies:** 1\
**Last updated:** [9 April 2020 10:48 UTC](https://discourse.nodered.org/t/how-check-context-exist/24515 "2020-04-09T10:48:38Z")

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hi I receive data but before updated I need check if data it's same or this object if exist or not so if exist check is data if equal else update or if not exist save it example check object "V06-bus" exist or not h…

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## [How can I take an action after a certain time?](https://discourse.nodered.org/t/how-can-i-take-an-action-after-a-certain-time/24309)

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**Author:** [@mimk97](https://discourse.nodered.org/u/mimk97)\
**Replies:** 8\
**Last updated:** [9 April 2020 10:01 UTC](https://discourse.nodered.org/t/how-can-i-take-an-action-after-a-certain-time/24309 "2020-04-09T10:01:41Z")

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Hi, i have this simple Flow. How can I set the LED to only go on when the status "0.5 - 3w" is longer than 5 minutes? \[{"id":"e7136258.3bb8d","type":"debug","z":"5024232.88595dc","name":"output 0.5 - 3w","active":true…

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## [How to feed table with such a SQLite table?](https://discourse.nodered.org/t/how-to-feed-table-with-such-a-sqlite-table/24415)

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**Author:** [@tarahi](https://discourse.nodered.org/u/tarahi)\
**Replies:** 17\
**Last updated:** [9 April 2020 08:38 UTC](https://discourse.nodered.org/t/how-to-feed-table-with-such-a-sqlite-table/24415 "2020-04-09T08:38:13Z")

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Dear friends, I have a SQLite table with such data : It stores sensor data .Column "device" stores sensor names and "val" stores their values. Now ,haw can I show such data in a table that shows all sensor and their…

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## [New NodeRed Docker build cannot edit SonosPollyTTS](https://discourse.nodered.org/t/new-nodered-docker-build-cannot-edit-sonospollytts/24468)

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**Author:** [@stevegroom](https://discourse.nodered.org/u/stevegroom)\
**Replies:** 2\
**Last updated:** [9 April 2020 07:44 UTC](https://discourse.nodered.org/t/new-nodered-docker-build-cannot-edit-sonospollytts/24468 "2020-04-09T07:44:57Z")

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Hello, I created a docker-compose file to run NodeRed on an Intel Nuc. ################################################################################ # Node-RED Stack or Compose ######################################…

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## [Master slider that "scales" other sliders?](https://discourse.nodered.org/t/master-slider-that-scales-other-sliders/24486)

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**Author:** [@hazymat](https://discourse.nodered.org/u/hazymat)\
**Replies:** 1\
**Last updated:** [9 April 2020 04:53 UTC](https://discourse.nodered.org/t/master-slider-that-scales-other-sliders/24486 "2020-04-09T04:53:39Z")

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I have x number of dashboard sliders, and I'd like to have a "master" slider that scales all of those sliders up and down. It sounds like a really easy problem to solve, until you start thinking in more detail. (I thi…

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## [Multiple picture send to email](https://discourse.nodered.org/t/multiple-picture-send-to-email/24477)

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**Author:** [@usmanEmder](https://discourse.nodered.org/u/usmanEmder)\
**Replies:** 1\
**Last updated:** [8 April 2020 21:33 UTC](https://discourse.nodered.org/t/multiple-picture-send-to-email/24477 "2020-04-08T21:33:27Z")

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Hi, I am using the following nodes to take a picture from RPi cam and then send it to email. \[{"id":"f5e22b0.5d7bdd8","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"9277c6bf.bf8c68","type":"inject","z"…

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## [\[solved\]\<device-attribute-name\>](https://discourse.nodered.org/t/solved-device-attribute-name/24481)

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**Author:** [@Mark\_Ellis](https://discourse.nodered.org/u/Mark_Ellis)\
**Replies:** 0\
**Last updated:** [8 April 2020 19:37 UTC](https://discourse.nodered.org/t/solved-device-attribute-name/24481 "2020-04-08T19:37:34Z")

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Has anyone used node-red-contrib-hubitat for Hubitat, I'm trying to force the device node to output the current state of this attribute, but i don't understand from help. I have a virtual presence and need to know if it…

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## [AND gate experiment](https://discourse.nodered.org/t/and-gate-experiment/24412)

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**Author:** [@mustafa](https://discourse.nodered.org/u/mustafa)\
**Replies:** 8\
**Last updated:** [8 April 2020 20:19 UTC](https://discourse.nodered.org/t/and-gate-experiment/24412 "2020-04-08T20:19:36Z")

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Hi Just last two week I started to learn node red and I start with very simple things I used AND gate with inject number or 80 and numeric. I found with condition=\> to the AND gate that the inject button will pass fro…

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## [Worldmap Heatmap Layer with Conditionals](https://discourse.nodered.org/t/worldmap-heatmap-layer-with-conditionals/24363)

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**Author:** [@danleighton](https://discourse.nodered.org/u/danleighton)\
**Replies:** 10\
**Last updated:** [8 April 2020 17:43 UTC](https://discourse.nodered.org/t/worldmap-heatmap-layer-with-conditionals/24363 "2020-04-08T17:43:13Z")

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Hi All, some help on working out how to do a heatmap layer needed please. My original data looks like this: \[{ "ID": 001, "Supplier": "Dredd Enterprises Inc.", "Contract": 2000, "Credit Score": "Secure"…

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## [Trying to figure out how to get Alexa to squirt a numerical value into Node-Red flow](https://discourse.nodered.org/t/trying-to-figure-out-how-to-get-alexa-to-squirt-a-numerical-value-into-node-red-flow/24467)

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**Author:** [@Surefire01](https://discourse.nodered.org/u/Surefire01)\
**Replies:** 1\
**Last updated:** [8 April 2020 15:52 UTC](https://discourse.nodered.org/t/trying-to-figure-out-how-to-get-alexa-to-squirt-a-numerical-value-into-node-red-flow/24467 "2020-04-08T15:52:27Z")

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As part of a larger project I'm trying to find a simple way which will enable a button in the mobile Alexa app on my phone to inject a numerical value into a Node-Red flow. I have been able to do it with a simple true/fa…

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## [Preload Date field in ui\_form](https://discourse.nodered.org/t/preload-date-field-in-ui-form/24416)

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**Author:** [@Colin](https://discourse.nodered.org/u/Colin)\
**Replies:** 10\
**Last updated:** [8 April 2020 15:25 UTC](https://discourse.nodered.org/t/preload-date-field-in-ui-form/24416 "2020-04-08T15:25:09Z")

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Can anyone tell me how to preload a Date field in a ui\_form? I have tried new Date(), new Date().getTime() and new Date().toISOString(). I can't think of anything else to try. I am able to preload other field types ok…

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## [SOLVED: Nodes registered as different names dont show in node-red at same time](https://discourse.nodered.org/t/solved-nodes-registered-as-different-names-dont-show-in-node-red-at-same-time/24459)

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**Author:** [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Replies:** 6\
**Last updated:** [8 April 2020 13:24 UTC](https://discourse.nodered.org/t/solved-nodes-registered-as-different-names-dont-show-in-node-red-at-same-time/24459 "2020-04-08T13:24:37Z")

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In the interest of solving an issue with the 2 image viewers (in node-red-contrib-image-tools and node-red-contrib-image-output) we have, could someone correct me or point me me towards info of how a node is registered p…

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## [SOLVED: Reed-Relays with NodeRed and Raspberry Pi / Windsensor](https://discourse.nodered.org/t/solved-reed-relays-with-nodered-and-raspberry-pi-windsensor/24452)

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**Author:** [@Harakaio](https://discourse.nodered.org/u/Harakaio)\
**Replies:** 1\
**Last updated:** [8 April 2020 11:56 UTC](https://discourse.nodered.org/t/solved-reed-relays-with-nodered-and-raspberry-pi-windsensor/24452 "2020-04-08T11:56:37Z")

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Hi everybody, I am new here and want to build a weather station for my garden with Node-Red. But now I have the problem that I want to connect a wind sensor to the Pi and the counting of the reed relays/contacts does n…

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## [Get coordinates of a satellite from http request](https://discourse.nodered.org/t/get-coordinates-of-a-satellite-from-http-request/24441)

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**Author:** [@JustSeen](https://discourse.nodered.org/u/JustSeen)\
**Replies:** 31\
**Last updated:** [8 April 2020 11:51 UTC](https://discourse.nodered.org/t/get-coordinates-of-a-satellite-from-http-request/24441 "2020-04-08T11:51:44Z")

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Hi, I want to retrieve the coordinates of a satellite, so I can display it. However, I retrieve the TLE data via an HTTP request. But I can't put it in the right format for the TLE function to convert the TLE data in…

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## [Error in connection with mariadb](https://discourse.nodered.org/t/error-in-connection-with-mariadb/24273)

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**Author:** [@phil1](https://discourse.nodered.org/u/phil1)\
**Replies:** 7\
**Last updated:** [8 April 2020 10:50 UTC](https://discourse.nodered.org/t/error-in-connection-with-mariadb/24273 "2020-04-08T10:50:13Z")

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Hello, I am trying in a simple projet (like a beginner...) to connect node-red to a database with mariadb (under raspberry pi) I have already create the base under Mariadb and i can access it sous mariadb (root + Passw…

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## [Node-Red on Qnap working, but not Alexa](https://discourse.nodered.org/t/node-red-on-qnap-working-but-not-alexa/24455)

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**Author:** [@c4yolli](https://discourse.nodered.org/u/c4yolli)\
**Replies:** 0\
**Last updated:** [8 April 2020 10:34 UTC](https://discourse.nodered.org/t/node-red-on-qnap-working-but-not-alexa/24455 "2020-04-08T10:34:01Z")

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Hi, has anyone already run node-red/alexa on qnap? I am using Qnap with Container-Station (Docker) and Node-Red 1.0.4 as Image. Node-Red is working. Now, i try to setup Alexa. I tried nearly all Flows out there. Nothin…

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## [Modbus Flex Connector Example](https://discourse.nodered.org/t/modbus-flex-connector-example/24447)

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**Author:** [@bdbell](https://discourse.nodered.org/u/bdbell)\
**Replies:** 0\
**Last updated:** [8 April 2020 09:55 UTC](https://discourse.nodered.org/t/modbus-flex-connector-example/24447 "2020-04-08T09:55:43Z")

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Does anyone have a working example of Modbus Flex Connector with the ability to dynamically connect to both TCP and SERIAL devices (using the most recent version of NR and node-red-contrib-modbus)? I have looked at MODS…

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## [Multiple Users Multiple devices - Thoughts](https://discourse.nodered.org/t/multiple-users-multiple-devices-thoughts/24423)

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**Author:** [@nksky](https://discourse.nodered.org/u/nksky)\
**Replies:** 6\
**Last updated:** [8 April 2020 08:13 UTC](https://discourse.nodered.org/t/multiple-users-multiple-devices-thoughts/24423 "2020-04-08T08:13:42Z")

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Thinking out loud here, any input welcome.... I'm trialing a prototype heat measuring system, Basically, each user has two Pi3's, each with a temp sensor, one with a relay. I have 1 Node-red flow, that compares temps an…

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## [Set time function on dashboard](https://discourse.nodered.org/t/set-time-function-on-dashboard/24008)

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**Author:** [@lalo](https://discourse.nodered.org/u/lalo)\
**Replies:** 44\
**Last updated:** [8 April 2020 07:43 UTC](https://discourse.nodered.org/t/set-time-function-on-dashboard/24008 "2020-04-08T07:43:54Z")

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Hi, i'm trying to make a function to select an hour to turn off the lights at 19:00 the only method that i used before is a delay but i was looking and i found the get mydate get hour, there is way to use a function like…

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## [Blink security camera](https://discourse.nodered.org/t/blink-security-camera/24398)

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**Author:** [@drumstick77](https://discourse.nodered.org/u/drumstick77)\
**Replies:** 1\
**Last updated:** [8 April 2020 06:59 UTC](https://discourse.nodered.org/t/blink-security-camera/24398 "2020-04-08T06:59:21Z")

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Hi All, Just wondering if anyone knows or has got a working node-red palette for blink security camera? thanks

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## [seeking out assist on thermostat common sense - counting instances over/underneath a value.](https://discourse.nodered.org/t/seeking-out-assist-on-thermostat-common-sense-counting-instances-over-underneath-a-value/24250)

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**Author:** [@JorgeDamien](https://discourse.nodered.org/u/JorgeDamien)\
**Replies:** 3\
**Last updated:** [8 April 2020 05:22 UTC](https://discourse.nodered.org/t/seeking-out-assist-on-thermostat-common-sense-counting-instances-over-underneath-a-value/24250 "2020-04-08T05:22:40Z")

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I think this is likely a stupid question, but I'm looking at a few counter nodes and I'm not exactly getting from them what I thought I would. Basically I have a flow now that checks the temperature from a Zigbee device…

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