# Latest

**URL:** https://discourse.nodered.org/latest.md?page=1198

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

**Page:** 1199

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## [\[ANNOUNCE\] node-red-contrib-drawsvg (beta version)](https://discourse.nodered.org/t/announce-node-red-contrib-drawsvg-beta-version/17724)

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**Author:** [@BartButenaers](https://discourse.nodered.org/u/BartButenaers)\
**Replies:** 2\
**Last updated:** [19 November 2019 19:16 UTC](https://discourse.nodered.org/t/announce-node-red-contrib-drawsvg-beta-version/17724 "2019-11-19T19:16:08Z")

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Hi folks, Recently @Steve-Mcl and I have published the node-red-contrib-ui-svg node, which allows users to integrate vector graphics in their Node-RED dashboard. To simplify the drawing process, we had added a button t…

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## [Node-red-contrib-spreadsheet-in capacity problem](https://discourse.nodered.org/t/node-red-contrib-spreadsheet-in-capacity-problem/18121)

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**Author:** [@kauan-AF](https://discourse.nodered.org/u/kauan-AF)\
**Replies:** 2\
**Last updated:** [19 November 2019 18:58 UTC](https://discourse.nodered.org/t/node-red-contrib-spreadsheet-in-capacity-problem/18121 "2019-11-19T18:58:26Z")

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Hi, I used node-red-contrib-spreadsheet-in nodes to extract information from an Excel file, but the flow only works with spreadsheets with less than eight thousand cells, and I need one that works with 20 thousand cells…

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## [Node-email wont send message from Rpi](https://discourse.nodered.org/t/node-email-wont-send-message-from-rpi/18158)

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**Author:** [@Martin](https://discourse.nodered.org/u/Martin)\
**Replies:** 0\
**Last updated:** [19 November 2019 18:53 UTC](https://discourse.nodered.org/t/node-email-wont-send-message-from-rpi/18158 "2019-11-19T18:53:56Z")

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Hello Readers,i've bee using node-email with Node-red on Windows 10 to send some files as e-mail's attatchments and it works fine. But now i wanted to use the same node with configuration on raspbian and it didn't work …

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## [Why does the list node removes password url’s or add’s “unsafe” in front of it](https://discourse.nodered.org/t/why-does-the-list-node-removes-password-url-s-or-add-s-unsafe-in-front-of-it/18153)

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**Author:** [@satoer](https://discourse.nodered.org/u/satoer)\
**Replies:** 0\
**Last updated:** [19 November 2019 16:03 UTC](https://discourse.nodered.org/t/why-does-the-list-node-removes-password-url-s-or-add-s-unsafe-in-front-of-it/18153 "2019-11-19T16:03:10Z")

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I’m trying to add images from my local network inside a list node This node: https://flows.nodered.org/node/node-red-node-ui-list This works fine for basic images from the internet. But when I want to use an image from…

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## [Node red RAM usage limit](https://discourse.nodered.org/t/node-red-ram-usage-limit/18150)

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**Author:** [@Henjoe](https://discourse.nodered.org/u/Henjoe)\
**Replies:** 2\
**Last updated:** [19 November 2019 15:00 UTC](https://discourse.nodered.org/t/node-red-ram-usage-limit/18150 "2019-11-19T15:00:06Z")

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I just saw in some forums that node red server only uses 512mb of RAM of your hardware. Is it true? What if I have 16gb of RAM, will it be possible that 8gb of it are dedicated for Nodered server? If yes.. how am I going…

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## [How to throw the error message in register function?](https://discourse.nodered.org/t/how-to-throw-the-error-message-in-register-function/18146)

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**Author:** [@matsujirushi](https://discourse.nodered.org/u/matsujirushi)\
**Replies:** 0\
**Last updated:** [19 November 2019 13:02 UTC](https://discourse.nodered.org/t/how-to-throw-the-error-message-in-register-function/18146 "2019-11-19T13:02:34Z")

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Hi, How to throw the error message when error happened in register function? (I tried to call 'node.error(), I cannot see it on Node-RED editor.)

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## [Node red retriggers at state change](https://discourse.nodered.org/t/node-red-retriggers-at-state-change/18144)

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**Author:** [@colint](https://discourse.nodered.org/u/colint)\
**Replies:** 2\
**Last updated:** [19 November 2019 12:24 UTC](https://discourse.nodered.org/t/node-red-retriggers-at-state-change/18144 "2019-11-19T12:24:14Z")

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Hello all, My name is Colin and i am new at this forum. I am using Node Red on a raspberry pi 2b for restarting domoticz or rebooting the pi with hardwired push buttons. Only i have a problem, when de state of the pin…

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## [Using python and raspberry with node red and using MQTT](https://discourse.nodered.org/t/using-python-and-raspberry-with-node-red-and-using-mqtt/18139)

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**Author:** [@mirou\_IoT](https://discourse.nodered.org/u/mirou_IoT)\
**Replies:** 10\
**Last updated:** [19 November 2019 11:43 UTC](https://discourse.nodered.org/t/using-python-and-raspberry-with-node-red-and-using-mqtt/18139 "2019-11-19T11:43:26Z")

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good morning , i need help i want to control solenoid valve 12 v by a raspberry 5 v and use python prog via MQTT and the switch that i will use it to control solenoid valve is in node red dashboard how i can do that p…

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## [Combine a message from mqtt and a select result from db](https://discourse.nodered.org/t/combine-a-message-from-mqtt-and-a-select-result-from-db/18141)

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**Author:** [@lucianv](https://discourse.nodered.org/u/lucianv)\
**Replies:** 2\
**Last updated:** [19 November 2019 10:53 UTC](https://discourse.nodered.org/t/combine-a-message-from-mqtt-and-a-select-result-from-db/18141 "2019-11-19T10:53:11Z")

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Hi, I am receiving a message on mqtt which I get as variable using a function " var status = msg.payload" but I am not able (i don t know how to do) to get in same function a value from an sql select and compare it to m…

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## [Create custom navigation bar from json file on uibuilder](https://discourse.nodered.org/t/create-custom-navigation-bar-from-json-file-on-uibuilder/17595)

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**Author:** [@emerichrv](https://discourse.nodered.org/u/emerichrv)\
**Replies:** 20\
**Last updated:** [19 November 2019 10:50 UTC](https://discourse.nodered.org/t/create-custom-navigation-bar-from-json-file-on-uibuilder/17595 "2019-11-19T10:50:26Z")

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Hi, How can I create an html navigation bar automatically from reading json file wich looks like : { "html": { "menu3": { "sub\_menu3\_1": { "data1": "none", "data2…

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## [Creation of execute resource in LWM2M](https://discourse.nodered.org/t/creation-of-execute-resource-in-lwm2m/18128)

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**Author:** [@akhtar321h](https://discourse.nodered.org/u/akhtar321h)\
**Replies:** 9\
**Last updated:** [19 November 2019 10:48 UTC](https://discourse.nodered.org/t/creation-of-execute-resource-in-lwm2m/18128 "2019-11-19T10:48:35Z")

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I want to create execute resource in LWM2M but its not creating. i am creating one object for that i am taking object id 420 and instance id 0 or 1 and resource id like 1,2,3,..... , object is creating on Leshan server b…

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## [Digital Ruler / Linear Displacement Sensor](https://discourse.nodered.org/t/digital-ruler-linear-displacement-sensor/18140)

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**Author:** [@agoralive](https://discourse.nodered.org/u/agoralive)\
**Replies:** 1\
**Last updated:** [19 November 2019 10:28 UTC](https://discourse.nodered.org/t/digital-ruler-linear-displacement-sensor/18140 "2019-11-19T10:28:46Z")

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For a long time Node-Red has been my friends, as things seems to be SO EASY, but I have learned my lesson :frowning: I have bought a Linear Displacement Sensor, and I am able to the readings that I need, but now I want …

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## [Real-time line chart time x-axis](https://discourse.nodered.org/t/real-time-line-chart-time-x-axis/18009)

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**Author:** [@davebanthorpe](https://discourse.nodered.org/u/davebanthorpe)\
**Replies:** 8\
**Last updated:** [19 November 2019 10:06 UTC](https://discourse.nodered.org/t/real-time-line-chart-time-x-axis/18009 "2019-11-19T10:06:10Z")

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OK - so here is my issue. I am using a chart on a dashboard to display real-time data. I have 4 data sources, each of which are sampled at slightly different times and so I pass the data directly from each source to the …

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## [Group Node - Horizontal Layout](https://discourse.nodered.org/t/group-node-horizontal-layout/8718)

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**Author:** [@tcontrada](https://discourse.nodered.org/u/tcontrada)\
**Replies:** 6\
**Last updated:** [18 November 2019 23:10 UTC](https://discourse.nodered.org/t/group-node-horizontal-layout/8718 "2019-11-18T23:10:46Z")

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I notice that the Group UI node places content in a vertical layout regardless of the Group width. I want to display something like a Toolbar at the top of my layout. It has a size of 1x20. I want the tool buttons to l…

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## [Problems with A / D converter 3008 and Node-Red](https://discourse.nodered.org/t/problems-with-a-d-converter-3008-and-node-red/18112)

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**Author:** [@seppel1078](https://discourse.nodered.org/u/seppel1078)\
**Replies:** 1\
**Last updated:** [18 November 2019 22:31 UTC](https://discourse.nodered.org/t/problems-with-a-d-converter-3008-and-node-red/18112 "2019-11-18T22:31:44Z")

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Hi, I would like to read the values of my MCP3008 via Node-Red. By Python script I get to the values so everything is already connected and configured correctly. I installed Node-Red as an instance of IOBroker This no…

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## [Loop Function for JSON table](https://discourse.nodered.org/t/loop-function-for-json-table/18116)

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**Author:** [@forrest.gates](https://discourse.nodered.org/u/forrest.gates)\
**Replies:** 1\
**Last updated:** [18 November 2019 22:05 UTC](https://discourse.nodered.org/t/loop-function-for-json-table/18116 "2019-11-18T22:05:55Z")

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Hi there, I am a newer user of node-red, and I'm attempting to use a function that will read directly from a JSON table and spit out all the values in order so that it can be read in a line chart. However when i try to …

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## [Amazon S3 in node watch frequency](https://discourse.nodered.org/t/amazon-s3-in-node-watch-frequency/18120)

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**Author:** [@toka](https://discourse.nodered.org/u/toka)\
**Replies:** 0\
**Last updated:** [18 November 2019 21:09 UTC](https://discourse.nodered.org/t/amazon-s3-in-node-watch-frequency/18120 "2019-11-18T21:09:36Z")

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Hi I'm using the "amazon S3 in" node (from node-red-node-aws module) to watch file events in my S3 bucket. As a start, I passed the output of the "amazon S3 in" node into a debug node. In general this works. At first …

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## [How to decipher Snips MQTT information](https://discourse.nodered.org/t/how-to-decipher-snips-mqtt-information/18052)

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**Author:** [@rlongfield](https://discourse.nodered.org/u/rlongfield)\
**Replies:** 11\
**Last updated:** [18 November 2019 19:21 UTC](https://discourse.nodered.org/t/how-to-decipher-snips-mqtt-information/18052 "2019-11-18T19:21:45Z")

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I am trying to use some MQTT data from Snips but I'm new to Node-Red and I'm stumbling a bit while I begin to understand the bits of Node-Red. I have this data from Snips on MQTT that I'd like to use. Message 10 receiv…

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## [Castv2-sender node](https://discourse.nodered.org/t/castv2-sender-node/18085)

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**Author:** [@rlongfield](https://discourse.nodered.org/u/rlongfield)\
**Replies:** 5\
**Last updated:** [18 November 2019 16:36 UTC](https://discourse.nodered.org/t/castv2-sender-node/18085 "2019-11-18T16:36:41Z")

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I am using castv2-sender node and it's working well to play a web stream, and controlling the volume. Unfortunately I can't get the Stop and Pause to work. After reading the doc I thought the payload would look somethi…

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## [MQTT subscription help](https://discourse.nodered.org/t/mqtt-subscription-help/18001)

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**Author:** [@maru](https://discourse.nodered.org/u/maru)\
**Replies:** 7\
**Last updated:** [18 November 2019 16:12 UTC](https://discourse.nodered.org/t/mqtt-subscription-help/18001 "2019-11-18T16:12:33Z")

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Hi, Can someone help me with this code? I'd like to trigger a Led when the value of the payload is \> 1000. #include \<ESP8266WiFi.h\> #include \<PubSubClient.h\> // Update these with values suitable for your network. con…

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## [Need math or change](https://discourse.nodered.org/t/need-math-or-change/18096)

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**Author:** [@ibottobi](https://discourse.nodered.org/u/ibottobi)\
**Replies:** 10\
**Last updated:** [18 November 2019 16:08 UTC](https://discourse.nodered.org/t/need-math-or-change/18096 "2019-11-18T16:08:50Z")

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Hello, I have a msg.payload with something like 130.33 e-42 and I want to have the decimal result 312.27, or rounded 312 back. Do I have to use math for this? Thanks in advance. Tobias

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## [Can not get USB serial work with Node-Red](https://discourse.nodered.org/t/can-not-get-usb-serial-work-with-node-red/17964)

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**Author:** [@insanoff](https://discourse.nodered.org/u/insanoff)\
**Replies:** 7\
**Last updated:** [18 November 2019 15:23 UTC](https://discourse.nodered.org/t/can-not-get-usb-serial-work-with-node-red/17964 "2019-11-18T15:23:44Z")

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Dear All, I am a newbie and it is my first time using Node-Red. My Node-Red is running on Raspberry Pi 4. For learning purpose I am trying to read ESP32 device connected to RPi via USB. I am able to display the output i…

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## [Exploring NR Editor source code - wrt new ideas](https://discourse.nodered.org/t/exploring-nr-editor-source-code-wrt-new-ideas/18100)

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**Author:** [@tony-shannon](https://discourse.nodered.org/u/tony-shannon)\
**Replies:** 4\
**Last updated:** [18 November 2019 15:00 UTC](https://discourse.nodered.org/t/exploring-nr-editor-source-code-wrt-new-ideas/18100 "2019-11-18T15:00:55Z")

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Hi I'm exploring some of the key aspects of NodeRed editor and wondering how they can be edited/customised +/- /improved.. For instance this panel here in the Change Node -- for JSONata expressions I would like to b…

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## [Reset counter - help](https://discourse.nodered.org/t/reset-counter-help/17893)

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**Author:** [@Ki-va](https://discourse.nodered.org/u/Ki-va)\
**Replies:** 4\
**Last updated:** [18 November 2019 13:18 UTC](https://discourse.nodered.org/t/reset-counter-help/17893 "2019-11-18T13:18:03Z")

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I wrote a simple counter, \[{"id":"ee88e75c.aa2b98","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"152e6284.dd693d","type":"inject","z":"ee88e75c.aa2b98","name":"","topic":"","payload":"","payloadType":…

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## [Change node only returning first object](https://discourse.nodered.org/t/change-node-only-returning-first-object/18057)

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**Author:** [@martentornquist](https://discourse.nodered.org/u/martentornquist)\
**Replies:** 5\
**Last updated:** [18 November 2019 09:31 UTC](https://discourse.nodered.org/t/change-node-only-returning-first-object/18057 "2019-11-18T09:31:41Z")

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I am having big problem with the change node and JSONata this morning (first time I use it). I get the JSONata expression to work just fine if I run it in the debug node or using the test in the change node. But whatever…

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## [Multiple output Function nodes with multiple messages](https://discourse.nodered.org/t/multiple-output-function-nodes-with-multiple-messages/11536)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 18\
**Last updated:** [18 November 2019 06:51 UTC](https://discourse.nodered.org/t/multiple-output-function-nodes-with-multiple-messages/11536 "2019-11-18T06:51:54Z")

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(And the fool continues to bash his head against the wall) I've read this link (from search) Writing functions and it is interesting. I can sort of make it work, but when I try to apply it to the real flow, it doesn'…

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## [I2C nodes with arduino](https://discourse.nodered.org/t/i2c-nodes-with-arduino/18064)

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**Author:** [@caspera](https://discourse.nodered.org/u/caspera)\
**Replies:** 1\
**Last updated:** [18 November 2019 04:02 UTC](https://discourse.nodered.org/t/i2c-nodes-with-arduino/18064 "2019-11-18T04:02:40Z")

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Hello everyone, I am a last year student in ICT and i need to make a big project together with a friend of me so we wanted to try to make a smarthome without a premade OS system(It's scaled and only with 5V electronics)…

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## [Connect the mqtt subscriber node with an android application](https://discourse.nodered.org/t/connect-the-mqtt-subscriber-node-with-an-android-application/17866)

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**Author:** [@khalil](https://discourse.nodered.org/u/khalil)\
**Replies:** 3\
**Last updated:** [18 November 2019 03:32 UTC](https://discourse.nodered.org/t/connect-the-mqtt-subscriber-node-with-an-android-application/17866 "2019-11-18T03:32:18Z")

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Hi guys. i am trying to make an android application that can publish messages to node red trough the mqtt subscriber node but i dont know what is the code of the application that can help me do that. can anybody help me …

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## [Stjohnjohnson smartthings mqtt bridge](https://discourse.nodered.org/t/stjohnjohnson-smartthings-mqtt-bridge/17609)

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**Author:** [@M-a-r-k](https://discourse.nodered.org/u/M-a-r-k)\
**Replies:** 5\
**Last updated:** [18 November 2019 00:03 UTC](https://discourse.nodered.org/t/stjohnjohnson-smartthings-mqtt-bridge/17609 "2019-11-18T00:03:58Z")

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Has anyone used the stjohnjohnson/smartthings-mqtt-bridge, as i would like to use it on my RP4 using docker and install node red, mqtt bridge and eclipse-mosquitto broker to it, and connect to my smarthings hub through t…

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## [Batch node use case example](https://discourse.nodered.org/t/batch-node-use-case-example/18079)

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**Author:** [@ab73863](https://discourse.nodered.org/u/ab73863)\
**Replies:** 2\
**Last updated:** [17 November 2019 22:48 UTC](https://discourse.nodered.org/t/batch-node-use-case-example/18079 "2019-11-17T22:48:01Z")

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Hi , I am a newbie to node-red and I am trying to understand the usages of each node . I couldn't find any examples around batch node to understand the use case where the node fits in . I read through the brief definit…

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