# Latest

**URL:** https://discourse.nodered.org/latest.md?page=808

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

**Page:** 809

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## [Ping - network latency](https://discourse.nodered.org/t/ping-network-latency/46129)

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**Author:** [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)\
**Replies:** 8\
**Last updated:** [25 May 2021 15:56 UTC](https://discourse.nodered.org/t/ping-network-latency/46129 "2021-05-25T15:56:54Z")

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I've been getting some inconsistent latency on ping requests, and it appears that it is being caused by this (copied from this article) The reason the first ping usually fails is that the remote router in that LAN has …

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## [Delete azure blob (file)](https://discourse.nodered.org/t/delete-azure-blob-file/46224)

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**Author:** [@shmiFesto](https://discourse.nodered.org/u/shmiFesto)\
**Replies:** 0\
**Last updated:** [25 May 2021 15:48 UTC](https://discourse.nodered.org/t/delete-azure-blob-file/46224 "2021-05-25T15:48:26Z")

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Hi all, using this palette https://flows.nodered.org/node/node-red-contrib-azure-blob-storage I'm wondering how I would delete a blob. The description says "You can create and delete Containers and also blob files." B…

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## [Machine Vision from Cloud to Edge](https://discourse.nodered.org/t/machine-vision-from-cloud-to-edge/45601)

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**Author:** [@pacosta](https://discourse.nodered.org/u/pacosta)\
**Replies:** 2\
**Last updated:** [25 May 2021 15:11 UTC](https://discourse.nodered.org/t/machine-vision-from-cloud-to-edge/45601 "2021-05-25T15:11:18Z")

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Want to use machine vision in your IoT applications? Learn how to build a production-ready app with Prescient Designer under an hour! In our upcoming webinar, we will show you how easy it is to build a machine vision …

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## [Node RED with ADAM 6717](https://discourse.nodered.org/t/node-red-with-adam-6717/46219)

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**Author:** [@KrishnanRavichandran](https://discourse.nodered.org/u/KrishnanRavichandran)\
**Replies:** 2\
**Last updated:** [25 May 2021 14:40 UTC](https://discourse.nodered.org/t/node-red-with-adam-6717/46219 "2021-05-25T14:40:17Z")

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Hello, I am new to Node RED programming and working on a project where I use ADAM 6717 gateway for Data acquisition, analysis, transmission. The Node red is built-in in the ADAM 6717 and I have programmed using nodes to…

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## [String variable --\> context.set("string variable", "on");](https://discourse.nodered.org/t/string-variable-context-set-string-variable-on/46222)

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**Author:** [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Replies:** 2\
**Last updated:** [25 May 2021 14:38 UTC](https://discourse.nodered.org/t/string-variable-context-set-string-variable-on/46222 "2021-05-25T14:38:34Z")

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how can I get this working? let s = "DGWZ"; I need : context.set("DGWZ","on");

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## [Send variable from Node-Red to python](https://discourse.nodered.org/t/send-variable-from-node-red-to-python/46218)

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**Author:** [@ptatay](https://discourse.nodered.org/u/ptatay)\
**Replies:** 1\
**Last updated:** [25 May 2021 14:09 UTC](https://discourse.nodered.org/t/send-variable-from-node-red-to-python/46218 "2021-05-25T14:09:42Z")

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Hi, I am trying to communicate python with node-red so that python knows the state of a variable that I receive by modbus.

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## [Snap on function for node red?](https://discourse.nodered.org/t/snap-on-function-for-node-red/46209)

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**Author:** [@edwardr](https://discourse.nodered.org/u/edwardr)\
**Replies:** 9\
**Last updated:** [25 May 2021 13:56 UTC](https://discourse.nodered.org/t/snap-on-function-for-node-red/46209 "2021-05-25T13:56:32Z")

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Hi Folks, I believe there is a snap on function for connecting nodes but I am totally clueless as to how to do it? Does anyone know how to have nodes snap on connect together rather than spending ages dragging lines fr…

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## [Ui-table ui\_control example does not work](https://discourse.nodered.org/t/ui-table-ui-control-example-does-not-work/46210)

<div class="topic-metadata">

**Author:** [@rogerjames99](https://discourse.nodered.org/u/rogerjames99)\
**Replies:** 3\
**Last updated:** [25 May 2021 13:52 UTC](https://discourse.nodered.org/t/ui-table-ui-control-example-does-not-work/46210 "2021-05-25T13:52:30Z")

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I have being using ui\_control to message to set up ui\_table for some time now. But after some updates to new versions of node-red related packages it has stopped working. No error messages in the nod-red log or the brow…

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## [Error with node ui-media](https://discourse.nodered.org/t/error-with-node-ui-media/46211)

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**Author:** [@victorramos99](https://discourse.nodered.org/u/victorramos99)\
**Replies:** 1\
**Last updated:** [25 May 2021 13:13 UTC](https://discourse.nodered.org/t/error-with-node-ui-media/46211 "2021-05-25T13:13:39Z")

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Hi! I just have installed the node ui-media to upload a picture to my dashboard. I follow the instructions of the node but when I try to upload the image my Node-Red crash and appear the following message: Lost connecti…

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## [Accessing variables in JSON](https://discourse.nodered.org/t/accessing-variables-in-json/46206)

<div class="topic-metadata">

**Author:** [@nacartwright](https://discourse.nodered.org/u/nacartwright)\
**Replies:** 6\
**Last updated:** [25 May 2021 13:06 UTC](https://discourse.nodered.org/t/accessing-variables-in-json/46206 "2021-05-25T13:06:59Z")

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I have a node that I need to build a JSON string but need the payload to be dynamic. The data that I need to use to populate the variables are deep inside another JSON string. I've tried saving my variable data in conte…

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## [Formula in expression (mathematics)](https://discourse.nodered.org/t/formula-in-expression-mathematics/46216)

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**Author:** [@HaVi](https://discourse.nodered.org/u/HaVi)\
**Replies:** 2\
**Last updated:** [25 May 2021 13:02 UTC](https://discourse.nodered.org/t/formula-in-expression-mathematics/46216 "2021-05-25T13:02:51Z")

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In a change node (see flow) I need to use the formula below: value = 10 ^ ((x-109) / 32) but I have no idea what is the correct way to put this formula in there. Of course I have tried different ways but without succes…

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## [TCP Open Protocol, POrt 4545 for Atlas Copco](https://discourse.nodered.org/t/tcp-open-protocol-port-4545-for-atlas-copco/46215)

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**Author:** [@wingkuan98](https://discourse.nodered.org/u/wingkuan98)\
**Replies:** 2\
**Last updated:** [25 May 2021 12:53 UTC](https://discourse.nodered.org/t/tcp-open-protocol-port-4545-for-atlas-copco/46215 "2021-05-25T12:53:33Z")

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Hi, I am currently working with MT Focus 6000 from Atlas Copco using this library “node-red-contrib-open-protocol-desoutter” in NodeRed. However, no matter how hard I tried, I can't get what I need by using the default …

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## [BME280 Sensor Init failed -\>Error: , Remote I/O error"](https://discourse.nodered.org/t/bme280-sensor-init-failed-error-remote-i-o-error/46205)

<div class="topic-metadata">

**Author:** [@Beginner96](https://discourse.nodered.org/u/Beginner96)\
**Replies:** 1\
**Last updated:** [25 May 2021 11:01 UTC](https://discourse.nodered.org/t/bme280-sensor-init-failed-error-remote-i-o-error/46205 "2021-05-25T11:01:48Z")

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Hello ! I tried to connect this bme280 to my raspberry 4B. I get the following I2C adress: When I want to get the data in node red. the following happens. I don't know what I did worng. I uninstalled / install…

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## [Waiting for missing types to be registered pm2 OK , systemd not OK](https://discourse.nodered.org/t/waiting-for-missing-types-to-be-registered-pm2-ok-systemd-not-ok/46204)

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**Author:** [@dzairo](https://discourse.nodered.org/u/dzairo)\
**Replies:** 2\
**Last updated:** [25 May 2021 10:59 UTC](https://discourse.nodered.org/t/waiting-for-missing-types-to-be-registered-pm2-ok-systemd-not-ok/46204 "2021-05-25T10:59:23Z")

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Hi all. For long time I again start my OrangePi Zero to play with Node-Red. I try control Input or Output for Arduino by Firmata . What is problem. If login to my OrangePi (not root) and type to command node-red , th…

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## [Logging and JSON backup to MySQL](https://discourse.nodered.org/t/logging-and-json-backup-to-mysql/46198)

<div class="topic-metadata">

**Author:** [@OriolFM](https://discourse.nodered.org/u/OriolFM)\
**Replies:** 4\
**Last updated:** [25 May 2021 10:07 UTC](https://discourse.nodered.org/t/logging-and-json-backup-to-mysql/46198 "2021-05-25T10:07:44Z")

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Hi, In my current project, I have several finite state machines that control a few AGVs that transport material. As its current state, the AGVs generate a readable verbose output each time they transit from one state t…

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## [Need help building bar chart from sqlite3 data](https://discourse.nodered.org/t/need-help-building-bar-chart-from-sqlite3-data/46197)

<div class="topic-metadata">

**Author:** [@testpaul999](https://discourse.nodered.org/u/testpaul999)\
**Replies:** 0\
**Last updated:** [25 May 2021 08:36 UTC](https://discourse.nodered.org/t/need-help-building-bar-chart-from-sqlite3-data/46197 "2021-05-25T08:36:50Z")

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Hello, I'm a total newbie and can't find a solution form my wishes. i won’t have a bar chart with my historical data. sqlite\> SELECT \* from daten\_gestern …\> ; 1621615512513|0.14 1621636200019| 1621722600020| 1621…

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## [Node-red deployed on kubernetes(as a pod) to intereact with azure iot edge](https://discourse.nodered.org/t/node-red-deployed-on-kubernetes-as-a-pod-to-intereact-with-azure-iot-edge/46149)

<div class="topic-metadata">

**Author:** [@omarine](https://discourse.nodered.org/u/omarine)\
**Replies:** 3\
**Last updated:** [25 May 2021 08:33 UTC](https://discourse.nodered.org/t/node-red-deployed-on-kubernetes-as-a-pod-to-intereact-with-azure-iot-edge/46149 "2021-05-25T08:33:59Z")

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Hello, i deployed Node-Red on azure kubernetes services to be able to interface with iotedge modules but i had this issue :slight\_smile: does anyone encountered this issue before or was able to run node-red (module …

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## [Recommended MicroSD for Rpi ZeroW](https://discourse.nodered.org/t/recommended-microsd-for-rpi-zerow/46132)

<div class="topic-metadata">

**Author:** [@craigcurtin](https://discourse.nodered.org/u/craigcurtin)\
**Replies:** 7\
**Last updated:** [25 May 2021 08:09 UTC](https://discourse.nodered.org/t/recommended-microsd-for-rpi-zerow/46132 "2021-05-25T08:09:18Z")

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Guys, Deploying a RPi ZeroW to read data from my Solar Inverter and pump it out over MQTT Firstly What SD card do people recommend ? 2ndly what is the best OS/Bundle to put on it for the RPi ZeroW and NR ? Craig

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## [\[Resolved\] Start/Stop motor with limit switch](https://discourse.nodered.org/t/resolved-start-stop-motor-with-limit-switch/3332)

<div class="topic-metadata">

**Author:** [@Pittex](https://discourse.nodered.org/u/Pittex)\
**Replies:** 20\
**Last updated:** [25 May 2021 04:59 UTC](https://discourse.nodered.org/t/resolved-start-stop-motor-with-limit-switch/3332 "2021-05-25T04:59:05Z")

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Hello, I wish I could drive (start and stop) a motor with the switch on my smartphone and if the movement is detected by the limit switch stop the movement. No worries with the use of GPIO. I tested several functions b…

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## [RS485 integration with Node-Red](https://discourse.nodered.org/t/rs485-integration-with-node-red/46163)

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**Author:** [@FeliceM](https://discourse.nodered.org/u/FeliceM)\
**Replies:** 3\
**Last updated:** [25 May 2021 04:51 UTC](https://discourse.nodered.org/t/rs485-integration-with-node-red/46163 "2021-05-25T04:51:49Z")

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This is not really a question about Node-Red but more about hardware. Having to integrate an RS485 Modbus TCP/IP to send sensors data, before dealing with the node I would like to ask advice about which interface board…

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## [Websocket broadcast data to individual user](https://discourse.nodered.org/t/websocket-broadcast-data-to-individual-user/46136)

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**Author:** [@Kartiknodered](https://discourse.nodered.org/u/Kartiknodered)\
**Replies:** 1\
**Last updated:** [25 May 2021 04:38 UTC](https://discourse.nodered.org/t/websocket-broadcast-data-to-individual-user/46136 "2021-05-25T04:38:16Z")

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Hello everyone , can any one tell me about how can we send data using websocket to the only user who is authorised with. Currently what is happening is that i am using websocket for real-time data update but if a user u…

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## [IoT gateway data to MQTT and then to KAFKA](https://discourse.nodered.org/t/iot-gateway-data-to-mqtt-and-then-to-kafka/46175)

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**Author:** [@faiaz](https://discourse.nodered.org/u/faiaz)\
**Replies:** 2\
**Last updated:** [25 May 2021 01:22 UTC](https://discourse.nodered.org/t/iot-gateway-data-to-mqtt-and-then-to-kafka/46175 "2021-05-25T01:22:10Z")

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Hi All I am first time here, and not a developer. I need help with a very basic flow I am successfully receiving data from IoT gateway via MQTT broker, i am able to filter and prepared dashboard with my data from BLE s…

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## [Html request does not forward request body](https://discourse.nodered.org/t/html-request-does-not-forward-request-body/45887)

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**Author:** [@skipware](https://discourse.nodered.org/u/skipware)\
**Replies:** 9\
**Last updated:** [24 May 2021 23:35 UTC](https://discourse.nodered.org/t/html-request-does-not-forward-request-body/45887 "2021-05-24T23:35:21Z")

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Hi, I set up OOB html request node using basic authentication and TLS/SSL to IXIA REST api. The request body is not sent. On the same server where node-red is installed I can use curl with the same data and it works fin…

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## [Conflict nodes / uninstal nodes](https://discourse.nodered.org/t/conflict-nodes-uninstal-nodes/45976)

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**Author:** [@Mixter](https://discourse.nodered.org/u/Mixter)\
**Replies:** 13\
**Last updated:** [24 May 2021 18:21 UTC](https://discourse.nodered.org/t/conflict-nodes-uninstal-nodes/45976 "2021-05-24T18:21:02Z")

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I warmly welcome, I tried to install nodes/libraries to nodered with command npm install ... and i saw this So then i tried to install it with Manage palette but it dont work. This node has a red triangle with an ex…

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## [Read ink fill level from Epson Printer](https://discourse.nodered.org/t/read-ink-fill-level-from-epson-printer/43048)

<div class="topic-metadata">

**Author:** [@Urs-Eppenberger](https://discourse.nodered.org/u/Urs-Eppenberger)\
**Replies:** 7\
**Last updated:** [24 May 2021 18:09 UTC](https://discourse.nodered.org/t/read-ink-fill-level-from-epson-printer/43048 "2021-05-24T18:09:05Z")

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I've got a new Epson printer ET-2750. Obviously this needs to be integrated into my node-red based home monitoring setup. I'm basically interested to collect a few parameters from the printer: ink level for the 4 colour…

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## [How to send .json strings over MQTT](https://discourse.nodered.org/t/how-to-send-json-strings-over-mqtt/46166)

<div class="topic-metadata">

**Author:** [@Maayz](https://discourse.nodered.org/u/Maayz)\
**Replies:** 2\
**Last updated:** [24 May 2021 16:10 UTC](https://discourse.nodered.org/t/how-to-send-json-strings-over-mqtt/46166 "2021-05-24T16:10:48Z")

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Hi All, I have been following this tutorial Link but i cannot get it to work when i replicate it on my machine. I have tried recreating from scratch and also downloaded the flow itself and reconfigured to my MQTT broke…

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## [Table alarm on dashboard](https://discourse.nodered.org/t/table-alarm-on-dashboard/46167)

<div class="topic-metadata">

**Author:** [@grandautism](https://discourse.nodered.org/u/grandautism)\
**Replies:** 0\
**Last updated:** [24 May 2021 16:00 UTC](https://discourse.nodered.org/t/table-alarm-on-dashboard/46167 "2021-05-24T16:00:47Z")

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hello, i want to create an alarm table but i can not found how to design it, also I want to display the date of the alarm but it displays the date in real time, as it appears twice, I don't know why if anyone can help m…

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## [Unit tests for Function node](https://discourse.nodered.org/t/unit-tests-for-function-node/46165)

<div class="topic-metadata">

**Author:** [@namgk](https://discourse.nodered.org/u/namgk)\
**Replies:** 0\
**Last updated:** [24 May 2021 15:34 UTC](https://discourse.nodered.org/t/unit-tests-for-function-node/46165 "2021-05-24T15:34:22Z")

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Hi there, I know Node-RED is all about low code, but on production and with experienced devs, the use of function nodes saves time and nodes (e.g. Switches, Changes, etc) on the canvas. I think it would be productive i…

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## [Where does NR reference time from?](https://discourse.nodered.org/t/where-does-nr-reference-time-from/46160)

<div class="topic-metadata">

**Author:** [@craigcurtin](https://discourse.nodered.org/u/craigcurtin)\
**Replies:** 2\
**Last updated:** [24 May 2021 15:08 UTC](https://discourse.nodered.org/t/where-does-nr-reference-time-from/46160 "2021-05-24T15:08:54Z")

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Guys, Just built a new VM - Ubuntu 20.04. Initially timezone was left as default since changed to be Sydney Australia - Date command at the CLI returns the correct date and time. However i have an inject node that is …

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## [Add timestamp item inside array](https://discourse.nodered.org/t/add-timestamp-item-inside-array/46158)

<div class="topic-metadata">

**Author:** [@Nabil](https://discourse.nodered.org/u/Nabil)\
**Replies:** 2\
**Last updated:** [24 May 2021 13:19 UTC](https://discourse.nodered.org/t/add-timestamp-item-inside-array/46158 "2021-05-24T13:19:03Z")

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Hi, I'm reading Modbus array \[5 items\] and I need to add -in the first position- the 6th item (timestamp) to log them in a csv file. I don't know how to insert the timestamp, any help is appreciated. here I created…

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