# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=915

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

**Page:** 916

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## [My journey into "Sub flows"](https://discourse.nodered.org/t/my-journey-into-sub-flows/7754)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 9\
**Last updated:** [9 February 2019 09:20 UTC](https://discourse.nodered.org/t/my-journey-into-sub-flows/7754 "2019-02-09T09:20:53Z")

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After a lot of thought, I am starting my journey into sub-flows. I get that it can only have one input and have multiple outputs. So putting aside the "problem" with only 1 input as that is true with all other nodes, s…

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## [Test of a sensor](https://discourse.nodered.org/t/test-of-a-sensor/7741)

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**Author:** [@smalhao](https://discourse.nodered.org/u/smalhao)\
**Replies:** 16\
**Last updated:** [9 February 2019 02:06 UTC](https://discourse.nodered.org/t/test-of-a-sensor/7741 "2019-02-09T02:06:48Z")

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I would like to test if a sensor is working, my schematic I have is the following what I intend is through a test function if the sensor 3 is working and showing a message saying ok, and when it is off to say no ok, t…

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## [Flows stopped as the credentials could not be decrypted](https://discourse.nodered.org/t/flows-stopped-as-the-credentials-could-not-be-decrypted/7732)

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**Author:** [@CaptClaude](https://discourse.nodered.org/u/CaptClaude)\
**Replies:** 6\
**Last updated:** [9 February 2019 01:12 UTC](https://discourse.nodered.org/t/flows-stopped-as-the-credentials-could-not-be-decrypted/7732 "2019-02-09T01:12:22Z")

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NR on OS X, recently updated. Problem: Everything was fine just a minute ago. I had a bunch of flows (some with Twitter credentials) working fine. I'm playing with a flaky USB-RS485 converter to do some Modbus and I ha…

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## [Error-circular - where is this coming from?](https://discourse.nodered.org/t/error-circular-where-is-this-coming-from/7114)

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**Author:** [@hazymat](https://discourse.nodered.org/u/hazymat)\
**Replies:** 53\
**Last updated:** [8 February 2019 20:01 UTC](https://discourse.nodered.org/t/error-circular-where-is-this-coming-from/7114 "2019-02-08T20:01:56Z")

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I'm getting "error-circular" from time to time, but there's no ID or source shown. I can't find a pattern to when it happens. I'm running Node-RED as a system service so how would I see more detailed errors to determine…

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## [Node red web page not loading or slow loading](https://discourse.nodered.org/t/node-red-web-page-not-loading-or-slow-loading/7386)

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**Author:** [@ftonello](https://discourse.nodered.org/u/ftonello)\
**Replies:** 19\
**Last updated:** [8 February 2019 17:38 UTC](https://discourse.nodered.org/t/node-red-web-page-not-loading-or-slow-loading/7386 "2019-02-08T17:38:50Z")

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I´m working in a rs-485 power meter web telemetry interface using raspbian, node-red in a raspberry pi3. I used the modbus nodes. I was increasing my flows, testing and improving. It´worked fine until suddenly, the web i…

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## [Help with i2c lcd node](https://discourse.nodered.org/t/help-with-i2c-lcd-node/5545)

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**Author:** [@kenkoknz](https://discourse.nodered.org/u/kenkoknz)\
**Replies:** 6\
**Last updated:** [8 February 2019 15:55 UTC](https://discourse.nodered.org/t/help-with-i2c-lcd-node/5545 "2019-02-08T15:55:15Z")

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Hi, I have been trying ti display data to lcd using the node-red-contrib-lcd20x4-i2c node. It seems to auto detect the i2c address and the screen initialise. I am struggling to try to display something by using an in…

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## [MySQL NODE-RED table](https://discourse.nodered.org/t/mysql-node-red-table/7612)

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**Author:** [@smalhao](https://discourse.nodered.org/u/smalhao)\
**Replies:** 33\
**Last updated:** [8 February 2019 12:03 UTC](https://discourse.nodered.org/t/mysql-node-red-table/7612 "2019-02-08T12:03:52Z")

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I'm trying to send 4 values ​​to the 4 columns of the database but I'm not able to put the payloads correctly because the three values ​​are inserted in each column and I wanted to separate each one of them into the corr…

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## [Disable deploy button](https://discourse.nodered.org/t/disable-deploy-button/7659)

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**Author:** [@shankara](https://discourse.nodered.org/u/shankara)\
**Replies:** 6\
**Last updated:** [8 February 2019 11:05 UTC](https://discourse.nodered.org/t/disable-deploy-button/7659 "2019-02-08T11:05:06Z")

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Hi, I wanted to disable (remove) deploy button, want to deploy the flow using button. Example : below is my flow, once I click button in Test node then it should deploy complete flows. Is this possible with little m…

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## [Node-red-contrib-sql](https://discourse.nodered.org/t/node-red-contrib-sql/7683)

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**Author:** [@smriths05](https://discourse.nodered.org/u/smriths05)\
**Replies:** 14\
**Last updated:** [8 February 2019 09:32 UTC](https://discourse.nodered.org/t/node-red-contrib-sql/7683 "2019-02-08T09:32:08Z")

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Hello everyone. I am having issues with the sql insert node, which is part of the sql package. I am unable to link it to the mysql database node. When I searched for a possible solution, it said that I have to modify the…

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## [Oh great! Now my MQTT is not working!](https://discourse.nodered.org/t/oh-great-now-my-mqtt-is-not-working/7652)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 32\
**Last updated:** [8 February 2019 08:09 UTC](https://discourse.nodered.org/t/oh-great-now-my-mqtt-is-not-working/7652 "2019-02-08T08:09:21Z")

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After the recent thing about the ui\_LED and the dashboard layout being fixed, I was about to go to bed then I noticed...... None of the MQTT nodes are connected. All set to MQTT HOST as the name, rather than the IP add…

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## [Worldmap - display info above icon](https://discourse.nodered.org/t/worldmap-display-info-above-icon/7676)

<div class="topic-metadata">

**Author:** [@thebaldgeek](https://discourse.nodered.org/u/thebaldgeek)\
**Replies:** 12\
**Last updated:** [8 February 2019 07:13 UTC](https://discourse.nodered.org/t/worldmap-display-info-above-icon/7676 "2019-02-08T07:13:30Z")

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Looked at the Worldmap page and did a search on here (and Google).... Cant seem to find what I am looking to do.... I use Worldmap to plot the position of aircraft that my tracking system picks up. What I would like to…

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## [Error or bug with global get when undefined](https://discourse.nodered.org/t/error-or-bug-with-global-get-when-undefined/7711)

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**Author:** [@Lost](https://discourse.nodered.org/u/Lost)\
**Replies:** 14\
**Last updated:** [8 February 2019 00:16 UTC](https://discourse.nodered.org/t/error-or-bug-with-global-get-when-undefined/7711 "2019-02-08T00:16:50Z")

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Hi. When i am trying to get a global variable with function TotkWh = global.get("power.VK.gang.kWh.Total")||0; i get this error: function : (error) "TypeError: Cannot read property 'VK' of undefined" If i write it w…

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## [I have an error but can't figure out which node](https://discourse.nodered.org/t/i-have-an-error-but-cant-figure-out-which-node/7567)

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**Author:** [@Barabba11](https://discourse.nodered.org/u/Barabba11)\
**Replies:** 7\
**Last updated:** [7 February 2019 21:33 UTC](https://discourse.nodered.org/t/i-have-an-error-but-cant-figure-out-which-node/7567 "2019-02-07T21:33:03Z")

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Hi! I have the following error: 4/2/2019, 13:49:24node: a0019baf.2b4678 msg : error "Error: EBADF, Bad file descriptor" I can click on node: a0019baf.2b4678 but it doesn't select any node in the flow, so how can I gu…

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## [RSS Feed for new Flows](https://discourse.nodered.org/t/rss-feed-for-new-flows/7726)

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**Author:** [@trockenasche](https://discourse.nodered.org/u/trockenasche)\
**Replies:** 1\
**Last updated:** [7 February 2019 21:21 UTC](https://discourse.nodered.org/t/rss-feed-for-new-flows/7726 "2019-02-07T21:21:05Z")

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Hi everyone, I like to subscribe to the new node from https://flows.nodered.org via RSS. At the moment I using a Tweet-to-RSS service to get all updates for new nodes from https://twitter.com/red\_nodes. Any chance to se…

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## [NodeRed and ESP01 with Momentary Switch](https://discourse.nodered.org/t/nodered-and-esp01-with-momentary-switch/7723)

<div class="topic-metadata">

**Author:** [@Hein](https://discourse.nodered.org/u/Hein)\
**Replies:** 1\
**Last updated:** [7 February 2019 19:13 UTC](https://discourse.nodered.org/t/nodered-and-esp01-with-momentary-switch/7723 "2019-02-07T19:13:00Z")

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Hi all, I\`m New to the forum but have used Node-RED for a while now. All my flows programs and everything works..... Except for one thing. I\`ve created a dashboard with a couple of light switches on it. The light swit…

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## [Switch node and Object message](https://discourse.nodered.org/t/switch-node-and-object-message/7706)

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**Author:** [@SuperNinja](https://discourse.nodered.org/u/SuperNinja)\
**Replies:** 2\
**Last updated:** [7 February 2019 14:59 UTC](https://discourse.nodered.org/t/switch-node-and-object-message/7706 "2019-02-07T14:59:24Z")

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I forgot to introduce myself Hi all , i'm new with Node Red and JavaScript. i'm on a project with multi sensor in my home automation. I would like to make averages for sensor values. I saw this topic which corresponds t…

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## [Z-Wave get commands (for example get meter)](https://discourse.nodered.org/t/z-wave-get-commands-for-example-get-meter/7694)

<div class="topic-metadata">

**Author:** [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Replies:** 0\
**Last updated:** [7 February 2019 09:13 UTC](https://discourse.nodered.org/t/z-wave-get-commands-for-example-get-meter/7694 "2019-02-07T09:13:04Z")

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I installed oppen Z-wave and I can receive data from my multiswitch which also meassures Voltage, Power etc. In order to get this information on demand, I have to send a get meter command. For example: Meter Get Command…

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## [Node red and relational database (mysql)?](https://discourse.nodered.org/t/node-red-and-relational-database-mysql/6874)

<div class="topic-metadata">

**Author:** [@Tefita](https://discourse.nodered.org/u/Tefita)\
**Replies:** 58\
**Last updated:** [7 February 2019 03:50 UTC](https://discourse.nodered.org/t/node-red-and-relational-database-mysql/6874 "2019-02-07T03:50:16Z")

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Greetings to all. I perform the registration of some data (name, surname, etc) and store them in a mysql table called patients, but this table is related to another named data and have the attribute idpacientes in the t…

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## [Switching between mqtt brokers](https://discourse.nodered.org/t/switching-between-mqtt-brokers/7672)

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**Author:** [@drmibell](https://discourse.nodered.org/u/drmibell)\
**Replies:** 3\
**Last updated:** [6 February 2019 22:37 UTC](https://discourse.nodered.org/t/switching-between-mqtt-brokers/7672 "2019-02-06T22:37:22Z")

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I'm working (on my laptop) on a project that uses a dozen or more mqtt nodes. When I'm at home I want them to connect to a broker on my home LAN, but on the road I want to use a broker on my laptop or a public broker. Is…

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## [Treeview UI in Node Red](https://discourse.nodered.org/t/treeview-ui-in-node-red/7673)

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**Author:** [@tcontrada](https://discourse.nodered.org/u/tcontrada)\
**Replies:** 0\
**Last updated:** [6 February 2019 21:37 UTC](https://discourse.nodered.org/t/treeview-ui-in-node-red/7673 "2019-02-06T21:37:17Z")

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I'm looking for a way to show a clickable Treeview within the Node Red UI Dashboard, if possible. The Treeview should take a JSON or JavaScript object and dynamically display the Tree with nodes that can expand/contract…

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## [Missing Flow Showing as "Global nodes"](https://discourse.nodered.org/t/missing-flow-showing-as-global-nodes/7644)

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**Author:** [@texasterminator5](https://discourse.nodered.org/u/texasterminator5)\
**Replies:** 3\
**Last updated:** [6 February 2019 20:08 UTC](https://discourse.nodered.org/t/missing-flow-showing-as-global-nodes/7644 "2019-02-06T20:08:10Z")

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One of my flows is no longer showing in the tabs within Node-Red. I am unsure if I somehow moved the location or deleted it. The flow appears to be working still so I assume it is not gone. When I went into the flows …

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## [Connection failed to broker](https://discourse.nodered.org/t/connection-failed-to-broker/7636)

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**Author:** [@MSJocke](https://discourse.nodered.org/u/MSJocke)\
**Replies:** 2\
**Last updated:** [6 February 2019 10:57 UTC](https://discourse.nodered.org/t/connection-failed-to-broker/7636 "2019-02-06T10:57:34Z")

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Hi, Im a noob to node-red, but pretty experienced in IOT, programming, etc. Im sure its a config issue, but I cant get NR to connect to the MQTT broker in the Hassio Pi. No matter what I input as server it keeps logging…

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## [MQTT data synchronization](https://discourse.nodered.org/t/mqtt-data-synchronization/7603)

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**Author:** [@ellerre](https://discourse.nodered.org/u/ellerre)\
**Replies:** 13\
**Last updated:** [6 February 2019 05:40 UTC](https://discourse.nodered.org/t/mqtt-data-synchronization/7603 "2019-02-06T05:40:48Z")

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Hello everyone! I have a question: how can I synchronize the data of various sensors with mqtt? Imagine this scenario: 15 temperature sensors distributed in my home, which detect temperatures every 15 minutes. sensor …

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## [Discard stored context with ease](https://discourse.nodered.org/t/discard-stored-context-with-ease/2364)

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**Author:** [@hotNipi](https://discourse.nodered.org/u/hotNipi)\
**Replies:** 2\
**Last updated:** [5 February 2019 17:40 UTC](https://discourse.nodered.org/t/discard-stored-context-with-ease/2364 "2019-02-05T17:40:14Z")

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It may happen that if you are experimenting with you flows and you use context storage you may find at one point that you have a lot of scrap data stored and you may want to just wipe all. With persistable context with …

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## [Project flakiness on macintosh](https://discourse.nodered.org/t/project-flakiness-on-macintosh/7493)

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**Author:** [@drmibell](https://discourse.nodered.org/u/drmibell)\
**Replies:** 7\
**Last updated:** [5 February 2019 17:08 UTC](https://discourse.nodered.org/t/project-flakiness-on-macintosh/7493 "2019-02-05T17:08:38Z")

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I have hesitated to ask about this issue because at first I it seemed hard to reproduce. It may also be platform specific, since it happens on my mac but not (apparently) on a Rpi. Recently, though, I have started shutti…

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## [Pubsub client and dashboard button problem](https://discourse.nodered.org/t/pubsub-client-and-dashboard-button-problem/7615)

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**Author:** [@yzerman](https://discourse.nodered.org/u/yzerman)\
**Replies:** 3\
**Last updated:** [5 February 2019 15:09 UTC](https://discourse.nodered.org/t/pubsub-client-and-dashboard-button-problem/7615 "2019-02-05T15:09:50Z")

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Hi, i have a problem with simple flow with mqtt and two buttons (on and off) I use pubsub client library and arduino. My goal is to turn on/off led connected to esp8266 via nod red dashboard. The problem is that in se…

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## [Not having any luck updating](https://discourse.nodered.org/t/not-having-any-luck-updating/7471)

<div class="topic-metadata">

**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 100\
**Last updated:** [5 February 2019 13:51 UTC](https://discourse.nodered.org/t/not-having-any-luck-updating/7471 "2019-02-05T13:51:39Z")

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This is getting very frustrating. I seem to be going in circles. RPI 2B. Raspberry Pi Model B Rev 2 PRETTY\_NAME="Raspbian GNU/Linux 9 (stretch)" NAME="Raspbian GNU/Linux" VERSION\_ID="9" VERSION="9 (stretch)" ID=raspb…

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## [Without Acess to the http](https://discourse.nodered.org/t/without-acess-to-the-http/7528)

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**Author:** [@stef](https://discourse.nodered.org/u/stef)\
**Replies:** 2\
**Last updated:** [5 February 2019 13:34 UTC](https://discourse.nodered.org/t/without-acess-to-the-http/7528 "2019-02-05T13:34:30Z")

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Hello, I am really new on the use of Node-red. I used another wifi to set the node-red on my raspberry pi, and right now that i am using my current wifi, i try to access the http but it is not working. Someone could p…

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## [Reusing msg object in Function requires cloning](https://discourse.nodered.org/t/reusing-msg-object-in-function-requires-cloning/7606)

<div class="topic-metadata">

**Author:** [@cflurin](https://discourse.nodered.org/u/cflurin)\
**Replies:** 6\
**Last updated:** [5 February 2019 12:29 UTC](https://discourse.nodered.org/t/reusing-msg-object-in-function-requires-cloning/7606 "2019-02-05T12:29:31Z")

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I know, it's a good practice to reuse the input msg in a function but in this case it can be painful to find out what is going on. If you reuse the msg in the following nodes, your first msg is also changed. Try this e…

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## [How to interact with a Siemens LOGO8](https://discourse.nodered.org/t/how-to-interact-with-a-siemens-logo8/5554)

<div class="topic-metadata">

**Author:** [@Flixm](https://discourse.nodered.org/u/Flixm)\
**Replies:** 1\
**Last updated:** [5 February 2019 12:26 UTC](https://discourse.nodered.org/t/how-to-interact-with-a-siemens-logo8/5554 "2019-02-05T12:26:26Z")

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Hi, Actually i have a second program (LOGOControl) running to interact / control my Siemens LOGO 8 ... all at my RPi3. The problem is that the LOGOControl freezes when there are to many http rest requests. Now i´m tih…

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