# General **URL:** https://discourse.nodered.org/c/general/7.md?page=290 [Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md) **Page:** 291 --- ## [What is a good bluetooth node for my system?](https://discourse.nodered.org/t/what-is-a-good-bluetooth-node-for-my-system/70940)
**Author:** [@Ceowens](https://discourse.nodered.org/u/Ceowens)\ **Replies:** 0\ **Last updated:** [20 November 2022 19:43 UTC](https://discourse.nodered.org/t/what-is-a-good-bluetooth-node-for-my-system/70940 "2022-11-20T19:43:43Z")
I have one Raspberry Pi 3B+ and a Raspberry Pi 4 both with Bluetooth upon them. What is the best node to use with them? I have Python code in one and I want to send a calculated number from one to the other with no acces… --- ## [\[Solved\] Error Undefined](https://discourse.nodered.org/t/solved-error-undefined/70900)
**Author:** [@martoq](https://discourse.nodered.org/u/martoq)\ **Replies:** 6\ **Last updated:** [20 November 2022 19:35 UTC](https://discourse.nodered.org/t/solved-error-undefined/70900 "2022-11-20T19:35:40Z")
I am banging my head against a wall at this point. I for the life of me cannot figure out why I am getting the following error. I’ve tried a for loop, a while loop, same result. I break it out and it’s an error inside th… --- ## [Vidéo return from VLC + control](https://discourse.nodered.org/t/video-return-from-vlc-control/70938)
**Author:** [@azertym](https://discourse.nodered.org/u/azertym)\ **Replies:** 0\ **Last updated:** [20 November 2022 19:07 UTC](https://discourse.nodered.org/t/video-return-from-vlc-control/70938 "2022-11-20T19:07:54Z")
Hi all, I use exec node to run a local video with vlc on a second screen, this is ok. Now i want push the device with more options. I want see the vidéo on my dashboard and i want control the playbar, because sometimes… --- ## [Check for value changes](https://discourse.nodered.org/t/check-for-value-changes/69346)
**Author:** [@Crashy77](https://discourse.nodered.org/u/Crashy77)\ **Replies:** 5\ **Last updated:** [20 November 2022 18:50 UTC](https://discourse.nodered.org/t/check-for-value-changes/69346 "2022-11-20T18:50:47Z")
Hi. I´ve an analogue input card and sometimes the values are stucking. I don´t know why. The i2c bus is running and finding the card. The problem is on all 4 inputs. After restarting the pi it´s working again. How ca… --- ## [Content aware debounce](https://discourse.nodered.org/t/content-aware-debounce/70933)
**Author:** [@dsl400](https://discourse.nodered.org/u/dsl400)\ **Replies:** 2\ **Last updated:** [20 November 2022 18:34 UTC](https://discourse.nodered.org/t/content-aware-debounce/70933 "2022-11-20T18:34:35Z")
Any suggestion on how to debounce based on payload value? messages are coming in via http request from multiple clients to the same endpoint node-red/getInfo?client=\ some clients mite access the url multipl… --- ## [Node red restart by itself](https://discourse.nodered.org/t/node-red-restart-by-itself/68100)
**Author:** [@piwi447](https://discourse.nodered.org/u/piwi447)\ **Replies:** 26\ **Last updated:** [20 November 2022 17:12 UTC](https://discourse.nodered.org/t/node-red-restart-by-itself/68100 "2022-11-20T17:12:21Z")
Hello, I am using nodered on a raspberry 4b, in a docker container using IOTStack configuration. I use nodered mainly to get data from OPC UA and inject them in influxDB but also for interface with OpenWeather or Shell… --- ## [How to get and store data about usage of Asus router](https://discourse.nodered.org/t/how-to-get-and-store-data-about-usage-of-asus-router/70898)
**Author:** [@demokedes](https://discourse.nodered.org/u/demokedes)\ **Replies:** 2\ **Last updated:** [20 November 2022 16:44 UTC](https://discourse.nodered.org/t/how-to-get-and-store-data-about-usage-of-asus-router/70898 "2022-11-20T16:44:01Z")
Dear all, In my LAN; I am using Asus router along with their Mesh nodes. If I log to the management site of the system, I see all different useful information like: uptime, CPU load, Upload/download speed in general or … --- ## [Issues calculating time between two timestamps](https://discourse.nodered.org/t/issues-calculating-time-between-two-timestamps/70921)
**Author:** [@aperture1988](https://discourse.nodered.org/u/aperture1988)\ **Replies:** 5\ **Last updated:** [20 November 2022 14:53 UTC](https://discourse.nodered.org/t/issues-calculating-time-between-two-timestamps/70921 "2022-11-20T14:53:58Z")
Hello Guys, Hope everyone is well, I wonder if some one could assist me here, apologies in advance I'm very new to coding function nodes. Im in the process of trying to turn my dumb paper shredder into a somewhat smart… --- ## [Iterate trought array and create a chart](https://discourse.nodered.org/t/iterate-trought-array-and-create-a-chart/70919)
**Author:** [@Viktor](https://discourse.nodered.org/u/Viktor)\ **Replies:** 4\ **Last updated:** [20 November 2022 14:49 UTC](https://discourse.nodered.org/t/iterate-trought-array-and-create-a-chart/70919 "2022-11-20T14:49:47Z")
Hello, I would like to create a simple node that will read data from API and build a graph. Now I am stuck on pushing the data to the chart array. Can't find what is the problem here. I'm quite new in programming, sorr… --- ## [Can I input host,port,user,pass, topic to subscribe in MQTT node?](https://discourse.nodered.org/t/can-i-input-host-port-user-pass-topic-to-subscribe-in-mqtt-node/70876)
**Author:** [@yingkhun](https://discourse.nodered.org/u/yingkhun)\ **Replies:** 10\ **Last updated:** [20 November 2022 14:40 UTC](https://discourse.nodered.org/t/can-i-input-host-port-user-pass-topic-to-subscribe-in-mqtt-node/70876 "2022-11-20T14:40:42Z")
can I input host, port, user, pass, topic in MQTT node? I don't want to add a new MQTT broker because I have a lot of MQTT brokers (one device one broker) Thank you --- ## [Node-red-admin HELP! Installing a particular version of a node?](https://discourse.nodered.org/t/node-red-admin-help-installing-a-particular-version-of-a-node/11673)
**Author:** [@tree-frog](https://discourse.nodered.org/u/tree-frog)\ **Replies:** 9\ **Last updated:** [20 November 2022 09:17 UTC](https://discourse.nodered.org/t/node-red-admin-help-installing-a-particular-version-of-a-node/11673 "2022-11-20T09:17:39Z")
I am having trouble with 'node-red-contrib-mssql-plus' and others when it comes to connecting and working with multiple databases. There is a documented bug. There is no response from the owner of the node. The proble… --- ## [Split Hex string to 4 bytes](https://discourse.nodered.org/t/split-hex-string-to-4-bytes/70874)
**Author:** [@GRHMLGGT](https://discourse.nodered.org/u/GRHMLGGT)\ **Replies:** 3\ **Last updated:** [19 November 2022 21:35 UTC](https://discourse.nodered.org/t/split-hex-string-to-4-bytes/70874 "2022-11-19T21:35:12Z")
I want to split a hex string and work on each part separately, if i have a string such as "00D7FD0000280001" id like to be able split it out into 4 bytes. Any resources anyone can point me to? Thanks --- ## [Poll the state of a device on demand](https://discourse.nodered.org/t/poll-the-state-of-a-device-on-demand/70137)
**Author:** [@Anduvo](https://discourse.nodered.org/u/Anduvo)\ **Replies:** 17\ **Last updated:** [19 November 2022 21:10 UTC](https://discourse.nodered.org/t/poll-the-state-of-a-device-on-demand/70137 "2022-11-19T21:10:53Z")
Hi All, How can I poll the state of a device on demand? I don't want to wait until the device publish it's new readings on it's own because is too slow. More specifically I want to poll the state of an aqara motion se… --- ## [Supported node versions document update?](https://discourse.nodered.org/t/supported-node-versions-document-update/70881)
**Author:** [@Colin](https://discourse.nodered.org/u/Colin)\ **Replies:** 2\ **Last updated:** [19 November 2022 17:32 UTC](https://discourse.nodered.org/t/supported-node-versions-document-update/70881 "2022-11-19T17:32:38Z")
Does this page need updating? https://nodered.org/docs/faq/node-versions It suggests that nodejs 12 is supported for the current NR version, whereas I believe that at least 14 is required. Also do we still recommend 1… --- ## [Homeassistant core and node red on docker do not interface](https://discourse.nodered.org/t/homeassistant-core-and-node-red-on-docker-do-not-interface/70847)
**Author:** [@albertocapecchi795](https://discourse.nodered.org/u/albertocapecchi795)\ **Replies:** 6\ **Last updated:** [19 November 2022 16:24 UTC](https://discourse.nodered.org/t/homeassistant-core-and-node-red-on-docker-do-not-interface/70847 "2022-11-19T16:24:50Z")
Hi all, I have a perhaps trivial problem but to which I can't find a solution. I installed homeassistant core and node red on docker. Both servers work, unfortunately I can't get the node red server to see the homeassi… --- ## [Node Red Nordpool API, need help filtering the message](https://discourse.nodered.org/t/node-red-nordpool-api-need-help-filtering-the-message/70855)
**Author:** [@virtaz](https://discourse.nodered.org/u/virtaz)\ **Replies:** 2\ **Last updated:** [19 November 2022 14:56 UTC](https://discourse.nodered.org/t/node-red-nordpool-api-need-help-filtering-the-message/70855 "2022-11-19T14:56:28Z")
Hey. I'm using a flow copied from here: https://discourse.nodered.org/t/extract-value-from-array-based-on-timestamp/56954 It's workin ok, but the problem is that the price changes at the wrong time : Price change a… --- ## [Help me stop repeating message. (Super noob)](https://discourse.nodered.org/t/help-me-stop-repeating-message-super-noob/70832)
**Author:** [@lemehavit](https://discourse.nodered.org/u/lemehavit)\ **Replies:** 9\ **Last updated:** [19 November 2022 13:05 UTC](https://discourse.nodered.org/t/help-me-stop-repeating-message-super-noob/70832 "2022-11-19T13:05:10Z")
Hi I’m completely new to node red and I tried for hours to figure this out and need some help. I made a very simple flow that checks current electricity prices and turn on or off my AC unit. Base on specific values, now… --- ## [Two separate instances of MQTT and Node Red](https://discourse.nodered.org/t/two-separate-instances-of-mqtt-and-node-red/70871)
**Author:** [@Surefire01](https://discourse.nodered.org/u/Surefire01)\ **Replies:** 7\ **Last updated:** [19 November 2022 13:00 UTC](https://discourse.nodered.org/t/two-separate-instances-of-mqtt-and-node-red/70871 "2022-11-19T13:00:06Z")
Chaps A bit of advice please. My system consists of Node Red running on a Raspberry Pi 4 receiving data from several Sonoff TH16's temperature sensors (which have been flashed with Tasmota). The data is sent via an MQT… --- ## [Aynchronous wait node?](https://discourse.nodered.org/t/aynchronous-wait-node/70825)
**Author:** [@Gawan](https://discourse.nodered.org/u/Gawan)\ **Replies:** 11\ **Last updated:** [19 November 2022 01:15 UTC](https://discourse.nodered.org/t/aynchronous-wait-node/70825 "2022-11-19T01:15:51Z")
Hi, is there any kind of "asynchronous wait node" that can be used to forward messages with a fixed delay ? On the input side many messages are sent in a short period of time (like 10 / sec), but they should be forward… --- ## [Preparing MQTT Flow for Embedded Devices](https://discourse.nodered.org/t/preparing-mqtt-flow-for-embedded-devices/70790)
**Author:** [@besselfunct](https://discourse.nodered.org/u/besselfunct)\ **Replies:** 4\ **Last updated:** [18 November 2022 17:54 UTC](https://discourse.nodered.org/t/preparing-mqtt-flow-for-embedded-devices/70790 "2022-11-18T17:54:31Z")
Hi, So I'm trying to build a dashboard for our laboratory to control some custom-built temperature controllers. I thought this was going to be a relatively straightforward task, but it's been giving me fits. I want to … --- ## [Problem in converting decimal to ascii](https://discourse.nodered.org/t/problem-in-converting-decimal-to-ascii/70823)
**Author:** [@Alxender](https://discourse.nodered.org/u/Alxender)\ **Replies:** 3\ **Last updated:** [18 November 2022 22:22 UTC](https://discourse.nodered.org/t/problem-in-converting-decimal-to-ascii/70823 "2022-11-18T22:22:12Z")
I have problem in converting decimal to ascii. Can anyone glad to help me.? --- ## [Amazon s3 out node returns 'invalid properties -aws'](https://discourse.nodered.org/t/amazon-s3-out-node-returns-invalid-properties-aws/70856)
**Author:** [@Ihum](https://discourse.nodered.org/u/Ihum)\ **Replies:** 0\ **Last updated:** [18 November 2022 21:00 UTC](https://discourse.nodered.org/t/amazon-s3-out-node-returns-invalid-properties-aws/70856 "2022-11-18T21:00:27Z")
I am writing different JS functions to post, delete and get flows, and my flow is using the s3 out node. I am using the variables ${awsConfig} and ${s3Bucket} to hold values for aws and bucket. When I run the js file … --- ## [Addressing array variables](https://discourse.nodered.org/t/addressing-array-variables/70730)
**Author:** [@interscope101](https://discourse.nodered.org/u/interscope101)\ **Replies:** 16\ **Last updated:** [18 November 2022 20:06 UTC](https://discourse.nodered.org/t/addressing-array-variables/70730 "2022-11-18T20:06:42Z")
Hi! I have incoming array sets that get displayed in a tabulator table, where selected variables from each array (e.g. payload\[0\].position.units.value) make up the row. Table setup was straightforward, I simply point t… --- ## [Get Keyboard/barcode (qr) input on Windows](https://discourse.nodered.org/t/get-keyboard-barcode-qr-input-on-windows/70824)
**Author:** [@Sephen](https://discourse.nodered.org/u/Sephen)\ **Replies:** 9\ **Last updated:** [18 November 2022 19:35 UTC](https://discourse.nodered.org/t/get-keyboard-barcode-qr-input-on-windows/70824 "2022-11-18T19:35:55Z")
I've got a generic QR code scanner which basically behaves like a keyboard. I'm trying to get this qr barcode input when a barcode is scanned. Does anybody how to get this to work on Windows? --- ## [Thermostat via external sensor | Understanding MQTT or Home Assistant](https://discourse.nodered.org/t/thermostat-via-external-sensor-understanding-mqtt-or-home-assistant/70490)
**Author:** [@dokwon](https://discourse.nodered.org/u/dokwon)\ **Replies:** 14\ **Last updated:** [18 November 2022 19:14 UTC](https://discourse.nodered.org/t/thermostat-via-external-sensor-understanding-mqtt-or-home-assistant/70490 "2022-11-18T19:14:22Z")
First post, hope it's not terrible! Hi guys. So, as the title suggests I am planning a specific automation while also trying to understand as much as possible about node red in the process. I am running HA dockerized o… --- ## [New! Conversion data array boolean to char. Reading module inputs](https://discourse.nodered.org/t/new-conversion-data-array-boolean-to-char-reading-module-inputs/68877)
**Author:** [@Johnn](https://discourse.nodered.org/u/Johnn)\ **Replies:** 41\ **Last updated:** [18 November 2022 17:58 UTC](https://discourse.nodered.org/t/new-conversion-data-array-boolean-to-char-reading-module-inputs/68877 "2022-11-18T17:58:55Z")
Hello everyone! I am new and I am learning little by little. I got stuck in a data conversion. I have a module with 16 digital inputs. This module communicates by modbus. With a command I read an array of 16 booleans. … --- ## [Msg : "Error saving flows - msg : undefined undefined](https://discourse.nodered.org/t/msg-error-saving-flows-msg-undefined-undefined/6038)
**Author:** [@freddyandresh](https://discourse.nodered.org/u/freddyandresh)\ **Replies:** 8\ **Last updated:** [18 November 2022 14:09 UTC](https://discourse.nodered.org/t/msg-error-saving-flows-msg-undefined-undefined/6038 "2022-11-18T14:09:38Z")
Hello Experts, We have been working on a Web App in bluemix(IBM Cloud) using node-red, recently we have started receiving an unexpected error with not much detail of what is wrong. When we run node-red in IBM cloud, t… --- ## [How can I collect all data in one array](https://discourse.nodered.org/t/how-can-i-collect-all-data-in-one-array/70833)
**Author:** [@Remili158](https://discourse.nodered.org/u/Remili158)\ **Replies:** 1\ **Last updated:** [18 November 2022 13:39 UTC](https://discourse.nodered.org/t/how-can-i-collect-all-data-in-one-array/70833 "2022-11-18T13:39:05Z")
Hello everyone, I want to collect data coming from a sensor in an array. The sensor output is actualised every 1 sec. Every time a new value comes only 1 value will be stored in my array and the other values are 0. her… --- ## [Docker Development and move to production best practices](https://discourse.nodered.org/t/docker-development-and-move-to-production-best-practices/70821)
**Author:** [@zafrirron](https://discourse.nodered.org/u/zafrirron)\ **Replies:** 0\ **Last updated:** [18 November 2022 10:43 UTC](https://discourse.nodered.org/t/docker-development-and-move-to-production-best-practices/70821 "2022-11-18T10:43:01Z")
I'm currently evaluating migration of a large Node-Red application to docker environment. Experimenting quite a while with building customized image and persistence of data using volumes. Couple of best practices metho… --- ## [Node-red-contrib-mastodon](https://discourse.nodered.org/t/node-red-contrib-mastodon/70103)
**Author:** [@cymplecy](https://discourse.nodered.org/u/cymplecy)\ **Replies:** 17\ **Last updated:** [18 November 2022 10:21 UTC](https://discourse.nodered.org/t/node-red-contrib-mastodon/70103 "2022-11-18T10:21:35Z")
FYI Although the node is 4 years old - it seems to work fine [Previous page](https://discourse.nodered.org/c/general/7.md?page=289) [Next page](https://discourse.nodered.org/c/general/7.md?page=291)