# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=906

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

**Page:** 907

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## [How to differentiate message injected to two worldmap](https://discourse.nodered.org/t/how-to-differentiate-message-injected-to-two-worldmap/8821)

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**Author:** [@VIKRAMAS](https://discourse.nodered.org/u/VIKRAMAS)\
**Replies:** 3\
**Last updated:** [11 March 2019 07:22 UTC](https://discourse.nodered.org/t/how-to-differentiate-message-injected-to-two-worldmap/8821 "2019-03-11T07:22:11Z")

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In dashboard I'm having two world map(in separate tabs) in two flows, I have configured the inject node to inject message once it loads. But once it injects it injects to wrong world map. So, how can correct this one. …

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## [Docker v0.19.6-v8 does not include git - thus Projects does not work](https://discourse.nodered.org/t/docker-v0-19-6-v8-does-not-include-git-thus-projects-does-not-work/8820)

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**Author:** [@IoTPlay](https://discourse.nodered.org/u/IoTPlay)\
**Replies:** 0\
**Last updated:** [11 March 2019 02:54 UTC](https://discourse.nodered.org/t/docker-v0-19-6-v8-does-not-include-git-thus-projects-does-not-work/8820 "2019-03-11T02:54:12Z")

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Hi all, the latest version on docker at https://hub.docker.com/r/nodered/node-red-docker/tags now have not got git into the image, thus projects feature does not work, I had to downgrade to docker image v0.19.5-v8 for th…

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## [Node-red-contrib-google-action configuration](https://discourse.nodered.org/t/node-red-contrib-google-action-configuration/8810)

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**Author:** [@fabnavigator](https://discourse.nodered.org/u/fabnavigator)\
**Replies:** 1\
**Last updated:** [11 March 2019 02:52 UTC](https://discourse.nodered.org/t/node-red-contrib-google-action-configuration/8810 "2019-03-11T02:52:12Z")

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I'm trying to get this working and all I get is: My test app isn't responding right now. Try again soon. .I'm not sure what to put in the Action Request node URL field. I also have to specify the url in the sample acti…

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## [DS18B20 smoothing and PID tuning](https://discourse.nodered.org/t/ds18b20-smoothing-and-pid-tuning/1015)

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**Author:** [@Backup](https://discourse.nodered.org/u/Backup)\
**Replies:** 225\
**Last updated:** [10 March 2019 23:57 UTC](https://discourse.nodered.org/t/ds18b20-smoothing-and-pid-tuning/1015 "2019-03-10T23:57:19Z")

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I’m a home brewer. I make wine and brew beer but the temperature needs are similar so I created an node-red app that reads temperatures from several DS18B20 temperature probes and uses them to either turn on a heater or…

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## [Node-red container installation - iobroker node missing](https://discourse.nodered.org/t/node-red-container-installation-iobroker-node-missing/8807)

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**Author:** [@Coffeelover](https://discourse.nodered.org/u/Coffeelover)\
**Replies:** 2\
**Last updated:** [10 March 2019 20:38 UTC](https://discourse.nodered.org/t/node-red-container-installation-iobroker-node-missing/8807 "2019-03-10T20:38:34Z")

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Hi, I've registered to your forum to find some help for my installation: Main problem: the iobroker node is missing in my new, container-based installation. Further information: I used iobroker on my rPi and install…

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## [Fresh install with nodes not properly configured](https://discourse.nodered.org/t/fresh-install-with-nodes-not-properly-configured/8788)

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**Author:** [@russeljay](https://discourse.nodered.org/u/russeljay)\
**Replies:** 8\
**Last updated:** [10 March 2019 17:30 UTC](https://discourse.nodered.org/t/fresh-install-with-nodes-not-properly-configured/8788 "2019-03-10T17:30:45Z")

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Anyone aware of any bugs Installing Node-Red from the the script provided on the node-red.org Raspberry Pi installation page? A fresh install of Raspian Stretch Lite and running the installation script results in many n…

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## [Pi install nodejs question](https://discourse.nodered.org/t/pi-install-nodejs-question/8800)

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**Author:** [@Colin](https://discourse.nodered.org/u/Colin)\
**Replies:** 6\
**Last updated:** [10 March 2019 16:33 UTC](https://discourse.nodered.org/t/pi-install-nodejs-question/8800 "2019-03-10T16:33:38Z")

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I have just run the bash \<(curl... script to install node-red on a pi-zero running raspbian lite. It is all working ok but I am confused by something. The first time round I got stuck in the node-Red not fully installe…

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## [Trying to read last 100 entries from DynamoDB in AWS](https://discourse.nodered.org/t/trying-to-read-last-100-entries-from-dynamodb-in-aws/8801)

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**Author:** [@Sirhc](https://discourse.nodered.org/u/Sirhc)\
**Replies:** 9\
**Last updated:** [10 March 2019 13:36 UTC](https://discourse.nodered.org/t/trying-to-read-last-100-entries-from-dynamodb-in-aws/8801 "2019-03-10T13:36:02Z")

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Hello I have some entries in a DynamoDB on AWS which contain my IoT Device ID, the time of the entry and a payload with all the data my IoT device measured. I am wanting to extract this data from the DB to input it int…

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## [UI Chart from database](https://discourse.nodered.org/t/ui-chart-from-database/8774)

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**Author:** [@Sirhc](https://discourse.nodered.org/u/Sirhc)\
**Replies:** 2\
**Last updated:** [10 March 2019 11:38 UTC](https://discourse.nodered.org/t/ui-chart-from-database/8774 "2019-03-10T11:38:43Z")

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Hello I am trying to trigger a request to my IBM Cloudant database to return all data when opening the UI Dashboard. The flow I have is below, but I do not see anything in the debug node when I open the UI dashboard. I…

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## [How to add SOH at beginning and ETX at end](https://discourse.nodered.org/t/how-to-add-soh-at-beginning-and-etx-at-end/8794)

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**Author:** [@aargollo](https://discourse.nodered.org/u/aargollo)\
**Replies:** 2\
**Last updated:** [10 March 2019 10:25 UTC](https://discourse.nodered.org/t/how-to-add-soh-at-beginning-and-etx-at-end/8794 "2019-03-10T10:25:02Z")

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Hi Guys, I working on my device and I have doubts how to including SOH and ETX bytes at beginning and end on the new buffer flow. My code building the cmd to send via serial port w/ specific rules. To sending through th…

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## [Can't access termux node-red server on any other device other than the one running it](https://discourse.nodered.org/t/cant-access-termux-node-red-server-on-any-other-device-other-than-the-one-running-it/8761)

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**Author:** [@Nathan22211](https://discourse.nodered.org/u/Nathan22211)\
**Replies:** 8\
**Last updated:** [9 March 2019 21:20 UTC](https://discourse.nodered.org/t/cant-access-termux-node-red-server-on-any-other-device-other-than-the-one-running-it/8761 "2019-03-09T21:20:56Z")

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i'm new to node red so i started by trying to use my express 3 as a node red server. but not only can i only asses it on that very device, i can't input any text into the nodes. eg the termux notifications node

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## [Installing node via HTTP Post not working](https://discourse.nodered.org/t/installing-node-via-http-post-not-working/8783)

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**Author:** [@Cesar.Cervantes](https://discourse.nodered.org/u/Cesar.Cervantes)\
**Replies:** 0\
**Last updated:** [9 March 2019 16:35 UTC](https://discourse.nodered.org/t/installing-node-via-http-post-not-working/8783 "2019-03-09T16:35:22Z")

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I'm trying to install a node using the HTTP API: https://nodered.org/docs/api/admin/methods/post/nodes/ I tried with several HTTP clients, like Postman but I'm getting the following error: And if I try to use Java AP…

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## [Modbus/Arrays extract divide and give in stream](https://discourse.nodered.org/t/modbus-arrays-extract-divide-and-give-in-stream/8772)

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**Author:** [@krokodandi](https://discourse.nodered.org/u/krokodandi)\
**Replies:** 4\
**Last updated:** [9 March 2019 15:08 UTC](https://discourse.nodered.org/t/modbus-arrays-extract-divide-and-give-in-stream/8772 "2019-03-09T15:08:07Z")

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I don't understand how to grab and divide array He comes in the form msg.payload : Object object data: array\[2\] 0: 317 1: 205 buffer: buffer\[4\]raw 0: 0x1 1: 0x3d 2: 0x0 3: 0xcd I need to consistently pull out the dat…

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## [How to split and format to avoid a loop?](https://discourse.nodered.org/t/how-to-split-and-format-to-avoid-a-loop/8768)

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**Author:** [@jycemea](https://discourse.nodered.org/u/jycemea)\
**Replies:** 6\
**Last updated:** [9 March 2019 14:35 UTC](https://discourse.nodered.org/t/how-to-split-and-format-to-avoid-a-loop/8768 "2019-03-09T14:35:57Z")

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Hi, I need help to do the right split & format with 2 different messages, as the second msg is also including the first. The issue : the second msg is always doing a loop wen including the first. Can't find anything to…

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## [Remembering position on UI dashboard with worldmap](https://discourse.nodered.org/t/remembering-position-on-ui-dashboard-with-worldmap/8740)

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**Author:** [@Sirhc](https://discourse.nodered.org/u/Sirhc)\
**Replies:** 8\
**Last updated:** [9 March 2019 12:26 UTC](https://discourse.nodered.org/t/remembering-position-on-ui-dashboard-with-worldmap/8740 "2019-03-09T12:26:08Z")

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Hello I have setup an IoT device which passes co-ordinates to a worldmap node on my node-red UI dashboard on bluemix The problem is, is when I close the UI dashboard website and re-open it, it has to wait for a co-ordi…

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## [JSON parse error](https://discourse.nodered.org/t/json-parse-error/8726)

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**Author:** [@innotractor](https://discourse.nodered.org/u/innotractor)\
**Replies:** 6\
**Last updated:** [9 March 2019 09:19 UTC](https://discourse.nodered.org/t/json-parse-error/8726 "2019-03-09T09:19:15Z")

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Hi, I have written a function in order to generate a PUT towards an API, the debug node reports a JSON parse error however. Can somebody please provide me with some suggestions, the problem is related to the definition …

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## [Operate a switch node using a html button](https://discourse.nodered.org/t/operate-a-switch-node-using-a-html-button/8713)

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**Author:** [@hebergeweb](https://discourse.nodered.org/u/hebergeweb)\
**Replies:** 1\
**Last updated:** [9 March 2019 07:38 UTC](https://discourse.nodered.org/t/operate-a-switch-node-using-a-html-button/8713 "2019-03-09T07:38:48Z")

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HI, I have to create a function to operate a switch using a html buttons (ON\_switch and OFF\_switch) by using a template node and stay in the same url page /switchbtn when click. \[{"id":"3daf3076.cdfe9","type":"http in"…

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## [Data returned when hover of UI Chart](https://discourse.nodered.org/t/data-returned-when-hover-of-ui-chart/8758)

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**Author:** [@Sirhc](https://discourse.nodered.org/u/Sirhc)\
**Replies:** 2\
**Last updated:** [9 March 2019 03:17 UTC](https://discourse.nodered.org/t/data-returned-when-hover-of-ui-chart/8758 "2019-03-09T03:17:47Z")

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Hello Is there any way to return the points x and y values on the chart when I hover over the line with my mouse in the UI? At the moment it's returning this: In this example I'd like it to return 09:30:37, 3.729 fo…

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## [Payload message size in bytes](https://discourse.nodered.org/t/payload-message-size-in-bytes/8755)

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**Author:** [@sanserg](https://discourse.nodered.org/u/sanserg)\
**Replies:** 4\
**Last updated:** [9 March 2019 00:04 UTC](https://discourse.nodered.org/t/payload-message-size-in-bytes/8755 "2019-03-09T00:04:14Z")

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Hi is there a way to see the payload (JSON) message size in bytes using node-red ? Thanks

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## [Node Red Arduino connection](https://discourse.nodered.org/t/node-red-arduino-connection/8673)

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**Author:** [@Robin1](https://discourse.nodered.org/u/Robin1)\
**Replies:** 3\
**Last updated:** [8 March 2019 19:33 UTC](https://discourse.nodered.org/t/node-red-arduino-connection/8673 "2019-03-08T19:33:20Z")

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Hi, Recently I have been having trouble with connecting Node Red to my Arduino Board. When I was trying to locate the serial port in Node Red, it was not detected. Any advise on what to do will be appreciated. Robin.

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## [Can't split to prepare XML](https://discourse.nodered.org/t/cant-split-to-prepare-xml/8706)

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**Author:** [@jycemea](https://discourse.nodered.org/u/jycemea)\
**Replies:** 10\
**Last updated:** [8 March 2019 16:07 UTC](https://discourse.nodered.org/t/cant-split-to-prepare-xml/8706 "2019-03-08T16:07:53Z")

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Hi, Can someone give me a hand please? I would like to split : IWAP02,zh\_cn,0,7,226,10,1440|3671|13,9520|3672|12,9520|3673|11,9520|3674|10,9520|3675|9,9520|3676|8,9520|3677|7# and format the array as : 226,10,1440,3…

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## [How to send and receive UDP broadcast messages](https://discourse.nodered.org/t/how-to-send-and-receive-udp-broadcast-messages/8746)

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**Author:** [@Fozi](https://discourse.nodered.org/u/Fozi)\
**Replies:** 0\
**Last updated:** [8 March 2019 15:39 UTC](https://discourse.nodered.org/t/how-to-send-and-receive-udp-broadcast-messages/8746 "2019-03-08T15:39:27Z")

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Hi, there. I'm trying to send and listen for UDP broadcast messages using the UDP nodes. This post started as a question, but as I was writing it I managed to get it to work. I'm still posting this as I don't think it wo…

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## [Node-RED doesn't start anymore](https://discourse.nodered.org/t/node-red-doesnt-start-anymore/8698)

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**Author:** [@Kees](https://discourse.nodered.org/u/Kees)\
**Replies:** 3\
**Last updated:** [8 March 2019 12:34 UTC](https://discourse.nodered.org/t/node-red-doesnt-start-anymore/8698 "2019-03-08T12:34:25Z")

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My Node\_RED on Raspberry Pi doesn't start anymore. What can I do? Log: 7 Mar 10:32:05 - \[info\] Welcome to Node-RED 7 Mar 10:32:05 - \[info\] Node-RED version: v0.19.5 7 Mar 10:32:05 - \[info\] Node.js version: v8.15.1 …

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## [No update in Domoticz](https://discourse.nodered.org/t/no-update-in-domoticz/8725)

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**Author:** [@Accelerator](https://discourse.nodered.org/u/Accelerator)\
**Replies:** 10\
**Last updated:** [8 March 2019 12:27 UTC](https://discourse.nodered.org/t/no-update-in-domoticz/8725 "2019-03-08T12:27:56Z")

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This basic project is to support multiple sensors to communicate via Node-Red to Domoticz. Sensors ESP8862 \> MQTT \> Node-Red \> MQTT \> Domoticz The sample flow works fine till the moment that Node-Red has to update a …

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## [Get global value when setting payload](https://discourse.nodered.org/t/get-global-value-when-setting-payload/8733)

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**Author:** [@waqaslam](https://discourse.nodered.org/u/waqaslam)\
**Replies:** 4\
**Last updated:** [8 March 2019 09:30 UTC](https://discourse.nodered.org/t/get-global-value-when-setting-payload/8733 "2019-03-08T09:30:43Z")

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Hi Is there a way to retrieve global variable's value when setting a payload for a node? Lets say, in below image, I want to set the UUID hex-value coming from global-context in dashboard-button's payload option when b…

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## [Extract elements from the retrieved html document](https://discourse.nodered.org/t/extract-elements-from-the-retrieved-html-document/8719)

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**Author:** [@SuperNinja](https://discourse.nodered.org/u/SuperNinja)\
**Replies:** 4\
**Last updated:** [8 March 2019 09:00 UTC](https://discourse.nodered.org/t/extract-elements-from-the-retrieved-html-document/8719 "2019-03-08T09:00:33Z")

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1/ To begin, I followed this cookbook to pick a value in the Nodered website : Great ! I managed to display the version of nodeRed (with some modifications of the flow) \["v0.19.6"\]. 2/ Now I'm going to do the same …

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## [Help! How Fix it i got bitcoin mulware](https://discourse.nodered.org/t/help-how-fix-it-i-got-bitcoin-mulware/3843)

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**Author:** [@kullboys](https://discourse.nodered.org/u/kullboys)\
**Replies:** 2\
**Last updated:** [10 October 2018 05:07 UTC](https://discourse.nodered.org/t/help-how-fix-it-i-got-bitcoin-mulware/3843 "2018-10-10T05:07:49Z")

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Hello everyone help me my node-red got bitcoin script mulware like this because i'm not authen node-red how can i fix it Thanks.

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## [SQLite triggers](https://discourse.nodered.org/t/sqlite-triggers/8627)

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**Author:** [@Stylo](https://discourse.nodered.org/u/Stylo)\
**Replies:** 3\
**Last updated:** [7 March 2019 22:31 UTC](https://discourse.nodered.org/t/sqlite-triggers/8627 "2019-03-07T22:31:01Z")

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Does anyone know if I can run a SQL trigger in Node-Red to have it push information through the flow whenever the database is updated?

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## [Issue retrieving json from mqtt](https://discourse.nodered.org/t/issue-retrieving-json-from-mqtt/8680)

<div class="topic-metadata">

**Author:** [@Deca](https://discourse.nodered.org/u/Deca)\
**Replies:** 16\
**Last updated:** [7 March 2019 19:59 UTC](https://discourse.nodered.org/t/issue-retrieving-json-from-mqtt/8680 "2019-03-07T19:59:10Z")

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Hi there, I'm starting to use nodered for the first time and I'm trying to get data from a mqtt device for further processing (output on dashboard, save on mongodb and so on) I built the flow with dummy json object and…

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## [SD card deleted on accident](https://discourse.nodered.org/t/sd-card-deleted-on-accident/8707)

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**Author:** [@IvarMvl](https://discourse.nodered.org/u/IvarMvl)\
**Replies:** 1\
**Last updated:** [7 March 2019 14:35 UTC](https://discourse.nodered.org/t/sd-card-deleted-on-accident/8707 "2019-03-07T14:35:42Z")

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I know this is not a node-red question but yesterday i deleted the right part of my SD card Is there any way i can get it back? i didnt find anything my self. did i just delete everything of can i get it back from …

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