# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=423

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

**Page:** 424

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## [Cronplus - trigger based on schedule condition?](https://discourse.nodered.org/t/cronplus-trigger-based-on-schedule-condition/58215)

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**Author:** [@hazymat](https://discourse.nodered.org/u/hazymat)\
**Replies:** 5\
**Last updated:** [12 February 2022 12:56 UTC](https://discourse.nodered.org/t/cronplus-trigger-based-on-schedule-condition/58215 "2022-02-12T12:56:15Z")

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My apologies if I missed this within the excellent docs I have read so far. Can cronplus node act as a condition for incoming triggers? For example, I have a door sensor which I want to trigger a light to come on, but o…

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## [Convert HTTP-Stream into RTSP-Stream](https://discourse.nodered.org/t/convert-http-stream-into-rtsp-stream/58165)

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**Author:** [@Timmy275](https://discourse.nodered.org/u/Timmy275)\
**Replies:** 7\
**Last updated:** [12 February 2022 12:52 UTC](https://discourse.nodered.org/t/convert-http-stream-into-rtsp-stream/58165 "2022-02-12T12:52:27Z")

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Hello guys! Im completely new to the Node-RED environment, so please have mercy :grinning: As part of my thesis I am trying to get the video-stream of an IP-based device. The idea is to grab the images and use the "mu…

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## [Send variable to subflow](https://discourse.nodered.org/t/send-variable-to-subflow/58203)

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**Author:** [@fmarzocca](https://discourse.nodered.org/u/fmarzocca)\
**Replies:** 2\
**Last updated:** [12 February 2022 11:30 UTC](https://discourse.nodered.org/t/send-variable-to-subflow/58203 "2022-02-12T11:30:55Z")

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I have a subflow which requires to enter an env variable, like this: Is there a way to send the variable "Playlist uri" from a node instead of manually?

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## [Can't seem to generate an array in a flow variable](https://discourse.nodered.org/t/cant-seem-to-generate-an-array-in-a-flow-variable/58148)

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**Author:** [@aa777888-2](https://discourse.nodered.org/u/aa777888-2)\
**Replies:** 6\
**Last updated:** [12 February 2022 11:17 UTC](https://discourse.nodered.org/t/cant-seem-to-generate-an-array-in-a-flow-variable/58148 "2022-02-12T11:17:06Z")

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Hi all, I have a function that works on multiple, asynchronous messages to build up a data structure. Since I don't want to wait on all messages to arrive, but wish to process updates on a message by message basis, it w…

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## [MQTT Broker & TTN](https://discourse.nodered.org/t/mqtt-broker-ttn/58196)

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**Author:** [@Parr0t01](https://discourse.nodered.org/u/Parr0t01)\
**Replies:** 2\
**Last updated:** [12 February 2022 10:31 UTC](https://discourse.nodered.org/t/mqtt-broker-ttn/58196 "2022-02-12T10:31:18Z")

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Hello all, I am relatively new to Node red but have found it to be a remarkably handy platform when dealing with data coming from multiple sources, including The Things Network (TTN) - hence this question. In my curren…

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## [What's happened to the serial out/in nodes?](https://discourse.nodered.org/t/whats-happened-to-the-serial-out-in-nodes/58180)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 10\
**Last updated:** [12 February 2022 09:52 UTC](https://discourse.nodered.org/t/whats-happened-to-the-serial-out-in-nodes/58180 "2022-02-12T09:52:04Z")

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NR 2.1.6 Raspbian Buster. RasPi 3A Up until now I haven't had need for this node. But attacking a problem I have from a different angle I now need it. But I can't find it, and don't know its full name. Searching th…

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## [Node red crashing after deployment](https://discourse.nodered.org/t/node-red-crashing-after-deployment/58181)

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**Author:** [@sheminasalam](https://discourse.nodered.org/u/sheminasalam)\
**Replies:** 1\
**Last updated:** [12 February 2022 07:44 UTC](https://discourse.nodered.org/t/node-red-crashing-after-deployment/58181 "2022-02-12T07:44:46Z")

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Node red crashes after making changes to flows and deploying it. i get the following error in logs. \[error\] TypeError: Cannot read properties of undefined (reading 'update') at start (/opt/node\_modules/@node-red/run…

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## [Clear everything from node-red](https://discourse.nodered.org/t/clear-everything-from-node-red/58152)

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**Author:** [@pilou8830](https://discourse.nodered.org/u/pilou8830)\
**Replies:** 5\
**Last updated:** [12 February 2022 07:34 UTC](https://discourse.nodered.org/t/clear-everything-from-node-red/58152 "2022-02-12T07:34:23Z")

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hello how to clear all flows and subflows correctly. Because it seems that he remembers everything. on the image below we see in subflows 2 times the same things. when we do tests and have them erased how we do it. …

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## [How to Parameterize a node property to pass value during run time](https://discourse.nodered.org/t/how-to-parameterize-a-node-property-to-pass-value-during-run-time/58186)

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**Author:** [@Shiny](https://discourse.nodered.org/u/Shiny)\
**Replies:** 0\
**Last updated:** [12 February 2022 04:10 UTC](https://discourse.nodered.org/t/how-to-parameterize-a-node-property-to-pass-value-during-run-time/58186 "2022-02-12T04:10:37Z")

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Hi I want to pass a value to the deviceid field of the below node during run time. How do I do that. Please help

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## [Strange spacer appearance in2.2](https://discourse.nodered.org/t/strange-spacer-appearance-in2-2/58178)

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**Author:** [@gerry](https://discourse.nodered.org/u/gerry)\
**Replies:** 1\
**Last updated:** [11 February 2022 23:21 UTC](https://discourse.nodered.org/t/strange-spacer-appearance-in2-2/58178 "2022-02-11T23:21:48Z")

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In upgrading to 2.2 there appeared numerous spacers that needed to be deleted. Got it, but..... does anyone understand what created them or where they come from? I have five pi's and done two upgrades and this one was 2…

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## [Combining 2 parts of a msg.payload to form a Topic/Subtopic for publishing to MQTT](https://discourse.nodered.org/t/combining-2-parts-of-a-msg-payload-to-form-a-topic-subtopic-for-publishing-to-mqtt/58177)

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**Author:** [@justjoe96](https://discourse.nodered.org/u/justjoe96)\
**Replies:** 5\
**Last updated:** [11 February 2022 22:54 UTC](https://discourse.nodered.org/t/combining-2-parts-of-a-msg-payload-to-form-a-topic-subtopic-for-publishing-to-mqtt/58177 "2022-02-11T22:54:01Z")

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Hello. I'm not sure if this is even possible.... I am trying to take 2 separate parts of a msg.payload and convert them into an MQTT formatted topic/subtopic. For example, I want msg.topic to equal "msg.payload.paramet…

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## [If condition with multiple payloads](https://discourse.nodered.org/t/if-condition-with-multiple-payloads/58146)

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**Author:** [@atugrul](https://discourse.nodered.org/u/atugrul)\
**Replies:** 17\
**Last updated:** [11 February 2022 20:49 UTC](https://discourse.nodered.org/t/if-condition-with-multiple-payloads/58146 "2022-02-11T20:49:32Z")

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hello. i had a flow to get temp and humidity data from mqtt and send it Firebase real time database, i sent temp data and humidity data to firebase succesfully. and i want to use temp and humidity data for room is "rela…

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## [How to install Influxdb on Raspberry PI?](https://discourse.nodered.org/t/how-to-install-influxdb-on-raspberry-pi/58084)

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**Author:** [@nodenoob](https://discourse.nodered.org/u/nodenoob)\
**Replies:** 7\
**Last updated:** [11 February 2022 20:21 UTC](https://discourse.nodered.org/t/how-to-install-influxdb-on-raspberry-pi/58084 "2022-02-11T20:21:26Z")

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I am trying to install influxdb but i am not sure how to do it. I searched internet Tutorials but they are all different, and nobody seems to care which version they are downloading. Can anyone here help me? I am using…

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## [Shelly Gen2 MQTT Help](https://discourse.nodered.org/t/shelly-gen2-mqtt-help/53024)

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**Author:** [@CTRDevelopments](https://discourse.nodered.org/u/CTRDevelopments)\
**Replies:** 36\
**Last updated:** [11 February 2022 19:47 UTC](https://discourse.nodered.org/t/shelly-gen2-mqtt-help/53024 "2022-02-11T19:47:12Z")

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Hi, I am fairly new to Node Red but have managed to configure a number of Shelly Gen1 Devices to control lighting. I now have a Gen2 device and the MQTT structure is entirly different and I am a bit stuck. I have my inp…

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## [Calculating Frequencies](https://discourse.nodered.org/t/calculating-frequencies/57938)

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**Author:** [@YoOoS](https://discourse.nodered.org/u/YoOoS)\
**Replies:** 5\
**Last updated:** [11 February 2022 19:15 UTC](https://discourse.nodered.org/t/calculating-frequencies/57938 "2022-02-11T19:15:46Z")

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Hello everyone, Well I am a beginner with node red an programming. And I'm trying to finde ways to learn more. I want to make a diagram for two vibration sensors input. The signal is only 1 or 0. The Signal should be …

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## [Max31856 node from npm trouble](https://discourse.nodered.org/t/max31856-node-from-npm-trouble/58049)

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**Author:** [@devifast](https://discourse.nodered.org/u/devifast)\
**Replies:** 7\
**Last updated:** [11 February 2022 18:44 UTC](https://discourse.nodered.org/t/max31856-node-from-npm-trouble/58049 "2022-02-11T18:44:01Z")

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Hello. I have a problem with this node. max31856 - npm I am currently using node red version 2.2 but the node is not visible in node red ui . Any help?

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## [Detecting when parts are complete in asynchronous flow](https://discourse.nodered.org/t/detecting-when-parts-are-complete-in-asynchronous-flow/58159)

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**Author:** [@HarryPottar](https://discourse.nodered.org/u/HarryPottar)\
**Replies:** 3\
**Last updated:** [11 February 2022 18:36 UTC](https://discourse.nodered.org/t/detecting-when-parts-are-complete-in-asynchronous-flow/58159 "2022-02-11T18:36:54Z")

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Hi, This could get a long read, so thanks in advanced. I will post quick overview and then a detailed part. Overview: We have a flow that runs once a week, it downloads a csv (not shown), then cleans up the csv (not s…

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## [MQTT read node does not read values](https://discourse.nodered.org/t/mqtt-read-node-does-not-read-values/58139)

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**Author:** [@u20p17](https://discourse.nodered.org/u/u20p17)\
**Replies:** 2\
**Last updated:** [11 February 2022 18:02 UTC](https://discourse.nodered.org/t/mqtt-read-node-does-not-read-values/58139 "2022-02-11T18:02:08Z")

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Hi all, I am running HomeAssistant in the latest version with the NodeRed and Mosquitto Broker Addon installed. I use several Shellies which are configured to send via MQTT and with a MQTT Explorer I can see the message…

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## [Adress of a local webhook into NodeRed](https://discourse.nodered.org/t/adress-of-a-local-webhook-into-nodered/58098)

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**Author:** [@Flixm](https://discourse.nodered.org/u/Flixm)\
**Replies:** 2\
**Last updated:** [11 February 2022 17:17 UTC](https://discourse.nodered.org/t/adress-of-a-local-webhook-into-nodered/58098 "2022-02-11T17:17:15Z")

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Hi, quick question ... cause i've some trouble and i'm searching for a solution. What is the adress which i have to use to send a webhook to NodeRed in a local network? Am i right with IP: xxx.xxx.xxx.xxx:1880/test/tes…

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## [Possible bug ( UI dashboard switch node or function switch Node)](https://discourse.nodered.org/t/possible-bug-ui-dashboard-switch-node-or-function-switch-node/58043)

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**Author:** [@vikingsraven](https://discourse.nodered.org/u/vikingsraven)\
**Replies:** 24\
**Last updated:** [11 February 2022 17:05 UTC](https://discourse.nodered.org/t/possible-bug-ui-dashboard-switch-node-or-function-switch-node/58043 "2022-02-11T17:05:53Z")

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Hi all, doing a fairly simple display control for a PTZ camera, anyway i was getting multiple instances of switch toggles, so i copied the offending items to another flow just to see what was happening. i added anothe…

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## [Building the average of the last 5 msg and send it?](https://discourse.nodered.org/t/building-the-average-of-the-last-5-msg-and-send-it/58156)

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**Author:** [@nodenoob](https://discourse.nodered.org/u/nodenoob)\
**Replies:** 2\
**Last updated:** [11 February 2022 16:29 UTC](https://discourse.nodered.org/t/building-the-average-of-the-last-5-msg-and-send-it/58156 "2022-02-11T16:29:28Z")

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So I tried programming a function node which builds the average of the last 5 sent values and then sends it away.(to a database, because of that I save the first timestamp) But it just wont send away anything. Did I use…

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## [Raspyberry sense hat](https://discourse.nodered.org/t/raspyberry-sense-hat/58111)

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**Author:** [@bobdornan](https://discourse.nodered.org/u/bobdornan)\
**Replies:** 3\
**Last updated:** [11 February 2022 16:19 UTC](https://discourse.nodered.org/t/raspyberry-sense-hat/58111 "2022-02-11T16:19:13Z")

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getting started with sense hat project, display text does not work. Using Bullseye OS on a Pi3 B+

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## [Trigger when a value is above a threshold for a certain time period](https://discourse.nodered.org/t/trigger-when-a-value-is-above-a-threshold-for-a-certain-time-period/58157)

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**Author:** [@Vlasko](https://discourse.nodered.org/u/Vlasko)\
**Replies:** 4\
**Last updated:** [11 February 2022 15:51 UTC](https://discourse.nodered.org/t/trigger-when-a-value-is-above-a-threshold-for-a-certain-time-period/58157 "2022-02-11T15:51:20Z")

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I am aware that you can trigger an event if a variable is above some threshold, but I want to trigger an event only if that variable is above a threshold for some time period say 30 minutes, is this possible?

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## [Msg duplication because of 'Link out' and 'Link in'](https://discourse.nodered.org/t/msg-duplication-because-of-link-out-and-link-in/58127)

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**Author:** [@esalles](https://discourse.nodered.org/u/esalles)\
**Replies:** 8\
**Last updated:** [11 February 2022 15:00 UTC](https://discourse.nodered.org/t/msg-duplication-because-of-link-out-and-link-in/58127 "2022-02-11T15:00:22Z")

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Gents, I spent a couple of hour on an unbelievable beharior. I use to introduce many Link out and link in nodes between flows, and even in a single flow for clarifying my flow chart view. My trouble is that, some coup…

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## [Two injects - don't want at the same time](https://discourse.nodered.org/t/two-injects-dont-want-at-the-same-time/58135)

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**Author:** [@alda](https://discourse.nodered.org/u/alda)\
**Replies:** 12\
**Last updated:** [11 February 2022 14:15 UTC](https://discourse.nodered.org/t/two-injects-dont-want-at-the-same-time/58135 "2022-02-11T14:15:06Z")

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Hello, I'm new to node red and I want ask. I have two TCP injects : Because both are to the same ip adress, I need to be sure that injects will go in the sequence, not at the same time. How can I do it ? Thanks Ale…

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## [Template code question](https://discourse.nodered.org/t/template-code-question/58151)

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**Author:** [@WBr](https://discourse.nodered.org/u/WBr)\
**Replies:** 2\
**Last updated:** [11 February 2022 14:02 UTC](https://discourse.nodered.org/t/template-code-question/58151 "2022-02-11T14:02:36Z")

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I am quite new to witing code. could someone explain or show me why this works: \<style\> \[node-id="19d1fa033f658b1d"\] .value { font-size: 30px; } \[node-id="ba3de486c9d40a43"\] .value { font-size: 30px; } \[no…

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## [Question about memory leaking trough extensive use of node.status possible?](https://discourse.nodered.org/t/question-about-memory-leaking-trough-extensive-use-of-node-status-possible/58145)

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**Author:** [@lostbits](https://discourse.nodered.org/u/lostbits)\
**Replies:** 3\
**Last updated:** [11 February 2022 14:00 UTC](https://discourse.nodered.org/t/question-about-memory-leaking-trough-extensive-use-of-node-status-possible/58145 "2022-02-11T14:00:09Z")

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Hey there. As you might have noticed, I am doing some flow stuff with files on networks. Due to this, I created a pretty complex flow, analysing and parsing files and after that sending them to a MQTT broker. NodeRED: 2…

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## [Call a "usual-flow" from within a sub-flow](https://discourse.nodered.org/t/call-a-usual-flow-from-within-a-sub-flow/58141)

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**Author:** [@crackytsi](https://discourse.nodered.org/u/crackytsi)\
**Replies:** 1\
**Last updated:** [11 February 2022 13:21 UTC](https://discourse.nodered.org/t/call-a-usual-flow-from-within-a-sub-flow/58141 "2022-02-11T13:21:54Z")

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In a "usual" flow I want to use a sub-flow. This sub-flow prepares some data, should do a "link-call" to a "usual flow" and then do something again with the data, to output it the following nodes within the sub-flow. U…

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## [Color management by points.](https://discourse.nodered.org/t/color-management-by-points/58112)

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**Author:** [@earlywaff](https://discourse.nodered.org/u/earlywaff)\
**Replies:** 2\
**Last updated:** [11 February 2022 12:06 UTC](https://discourse.nodered.org/t/color-management-by-points/58112 "2022-02-11T12:06:03Z")

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I can't find a suitable node for my task: I want to control my lighting in the evenings. I have different color schemes (Each lamp in the house has a different color) and I want for a certain time - let's say one hour …

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## [Split node loses information](https://discourse.nodered.org/t/split-node-loses-information/58117)

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**Author:** [@t4ir1](https://discourse.nodered.org/u/t4ir1)\
**Replies:** 10\
**Last updated:** [11 February 2022 11:39 UTC](https://discourse.nodered.org/t/split-node-loses-information/58117 "2022-02-11T11:39:37Z")

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Hello there fellow noders! I have a flow where I query a database for some values. My query returns exactly my last 120 entries of the table in the database. I tried this a great deal of times and it always returns an a…

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