# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=961

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

**Page:** 962

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## [Node-Red crashes with webshot node](https://discourse.nodered.org/t/node-red-crashes-with-webshot-node/1309)

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**Author:** [@Sgilroy](https://discourse.nodered.org/u/Sgilroy)\
**Replies:** 0\
**Last updated:** [4 July 2018 09:34 UTC](https://discourse.nodered.org/t/node-red-crashes-with-webshot-node/1309 "2018-07-04T09:34:13Z")

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Hi Guys, I’ve been trying to make a node-red flow which captures images from my ip camera and feeds the result int watson visual recognition. To do this I am using the webshot node (node-red-contrib-webshot) the results…

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## [node-RED making HTTP requests when starting up](https://discourse.nodered.org/t/node-red-making-http-requests-when-starting-up/1211)

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**Author:** [@cdfx](https://discourse.nodered.org/u/cdfx)\
**Replies:** 18\
**Last updated:** [4 July 2018 09:26 UTC](https://discourse.nodered.org/t/node-red-making-http-requests-when-starting-up/1211 "2018-07-04T09:26:12Z")

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I needed to make use of the HTTP endpoint of the switches because the MQTT functionality of the switches did behave really weird and after hours of checking the configs and digging in the code, I had given up. So I crea…

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## [Update-rc.d not running](https://discourse.nodered.org/t/update-rc-d-not-running/1297)

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**Author:** [@mshaz](https://discourse.nodered.org/u/mshaz)\
**Replies:** 2\
**Last updated:** [4 July 2018 08:13 UTC](https://discourse.nodered.org/t/update-rc-d-not-running/1297 "2018-07-04T08:13:55Z")

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I m sorry if this is not relate to node-red but my whole system runs on it and i cant get the gsm running on boot. I followed this tutorial https://lawrencematthew.wordpress.com/2013/08/07/connect-raspberry-pi-to-a-3g-n…

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## [How to connect custom board with node-red](https://discourse.nodered.org/t/how-to-connect-custom-board-with-node-red/1304)

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**Author:** [@HemangGadhavi](https://discourse.nodered.org/u/HemangGadhavi)\
**Replies:** 8\
**Last updated:** [4 July 2018 07:30 UTC](https://discourse.nodered.org/t/how-to-connect-custom-board-with-node-red/1304 "2018-07-04T07:30:57Z")

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Hi, I am a beginner in node red. I have a custom board which has a Qualcomm processor so, my question is how I connect this board with node red.

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## [Node.error() not caught in Catch node](https://discourse.nodered.org/t/node-error-not-caught-in-catch-node/1301)

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**Author:** [@chainhead](https://discourse.nodered.org/u/chainhead)\
**Replies:** 2\
**Last updated:** [4 July 2018 06:13 UTC](https://discourse.nodered.org/t/node-error-not-caught-in-catch-node/1301 "2018-07-04T06:13:32Z")

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By default, will an error raised by node.error() be caught by Catch node. If not, why? Or, in which circumstances, will the Catch node not catch a node.error()? Please refer the observations and experiments below. Obse…

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## [Extracting & Appending Data](https://discourse.nodered.org/t/extracting-appending-data/1251)

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**Author:** [@ram1505](https://discourse.nodered.org/u/ram1505)\
**Replies:** 7\
**Last updated:** [4 July 2018 04:02 UTC](https://discourse.nodered.org/t/extracting-appending-data/1251 "2018-07-04T04:02:52Z")

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Hi, I’m trying to extract a chunk of text from my payload and append some text to it. Basically, it is a certificate file that I’m reading using a modem using AT command. I’ll be extracting the contents of the certifica…

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## [Failed to install azure plugin](https://discourse.nodered.org/t/failed-to-install-azure-plugin/1260)

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**Author:** [@SoCold](https://discourse.nodered.org/u/SoCold)\
**Replies:** 2\
**Last updated:** [3 July 2018 23:29 UTC](https://discourse.nodered.org/t/failed-to-install-azure-plugin/1260 "2018-07-03T23:29:25Z")

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Hi. I am trying to install this plugin: https://flows.nodered.org/node/node-red-contrib-azure-table-storage. I am using node-red through IBM Cloud and I am getting these following errors: Installation of module node-re…

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## [Updated node properties are not persisted](https://discourse.nodered.org/t/updated-node-properties-are-not-persisted/1277)

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**Author:** [@malinthasa](https://discourse.nodered.org/u/malinthasa)\
**Replies:** 2\
**Last updated:** [3 July 2018 17:32 UTC](https://discourse.nodered.org/t/updated-node-properties-are-not-persisted/1277 "2018-07-03T17:32:05Z")

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I have created a node which has 3 properties. My HTML looks like following \<script type="text/javascript"\> RED.nodes.registerType('person-data',{ category: 'function', color: '#a6bbcf', def…

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## [Save data from a sensor using a button](https://discourse.nodered.org/t/save-data-from-a-sensor-using-a-button/1269)

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**Author:** [@gabrieldicieri](https://discourse.nodered.org/u/gabrieldicieri)\
**Replies:** 9\
**Last updated:** [3 July 2018 13:52 UTC](https://discourse.nodered.org/t/save-data-from-a-sensor-using-a-button/1269 "2018-07-03T13:52:06Z")

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I am currently using a GrovePi distance sensor, I would like some ideas as I am new to this area. Would it be possible for me to save in a file to download, the data obtained by the sensor at a certain time? If so, could…

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## [Azure / Event hub configuration issues](https://discourse.nodered.org/t/azure-event-hub-configuration-issues/1246)

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**Author:** [@PK-MO](https://discourse.nodered.org/u/PK-MO)\
**Replies:** 4\
**Last updated:** [3 July 2018 11:35 UTC](https://discourse.nodered.org/t/azure-event-hub-configuration-issues/1246 "2018-07-03T11:35:03Z")

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I’m trying to configure an Azure event hub within a flow. To do this, you need to provide Name, Connection String and Event hub path… When using the Connection string provided in Azure, I encounter the error: TypeError:…

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## [Capture and email camera image](https://discourse.nodered.org/t/capture-and-email-camera-image/1262)

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**Author:** [@prgantuk](https://discourse.nodered.org/u/prgantuk)\
**Replies:** 2\
**Last updated:** [3 July 2018 09:17 UTC](https://discourse.nodered.org/t/capture-and-email-camera-image/1262 "2018-07-03T09:17:31Z")

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Hi All I’m trying to capture an image from my CCTV cameras and then email that image to my gmail account, I’m doing this will a http request node and then the email node, however it is not emailing the image from the ca…

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## [What goes in, isnt what comes out?](https://discourse.nodered.org/t/what-goes-in-isnt-what-comes-out/1241)

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**Author:** [@ausing](https://discourse.nodered.org/u/ausing)\
**Replies:** 5\
**Last updated:** [3 July 2018 06:31 UTC](https://discourse.nodered.org/t/what-goes-in-isnt-what-comes-out/1241 "2018-07-03T06:31:23Z")

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Hello, first time node-red user here. I was wondering if someone out there is expert enough to help me understand why the msg.payload is changing on me. I’m trying to set my Nest thermometer with https://github.com/hje…

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## [Problem understanding OWFS node](https://discourse.nodered.org/t/problem-understanding-owfs-node/1232)

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**Author:** [@bjoern](https://discourse.nodered.org/u/bjoern)\
**Replies:** 4\
**Last updated:** [2 July 2018 19:53 UTC](https://discourse.nodered.org/t/problem-understanding-owfs-node/1232 "2018-07-02T19:53:28Z")

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Hello guys, at the moment i try to build a 1-W to Ethernet Gateway. Therefor i have a raspberry pi with a 9 channel 1-W Shield. It runs well with piCore. Now i like to publish the sensor data via node-red to MQTT / UDP …

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## [Logs after deletion node](https://discourse.nodered.org/t/logs-after-deletion-node/1244)

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**Author:** [@dedynobre](https://discourse.nodered.org/u/dedynobre)\
**Replies:** 4\
**Last updated:** [2 July 2018 18:28 UTC](https://discourse.nodered.org/t/logs-after-deletion-node/1244 "2018-07-02T18:28:17Z")

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Hi, I added a node (s7com) and soon after deleting the same only it is generating a lot of connection failure logs. Is this normal or has the component been active in some other configuration?

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## [Node-red freezes running only a few nodes](https://discourse.nodered.org/t/node-red-freezes-running-only-a-few-nodes/1007)

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**Author:** [@leafboy](https://discourse.nodered.org/u/leafboy)\
**Replies:** 45\
**Last updated:** [2 July 2018 18:25 UTC](https://discourse.nodered.org/t/node-red-freezes-running-only-a-few-nodes/1007 "2018-07-02T18:25:14Z")

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Hello everybody. I am quite new to node-red so I hope you bear with me. On January I started my first Raspberry Pi projects. Sooner or later I found out some visualization would be quite nice. So I run a search and foun…

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## [Quering the PFOD protocol (or any other TCP protocol)](https://discourse.nodered.org/t/quering-the-pfod-protocol-or-any-other-tcp-protocol/1225)

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**Author:** [@xentity](https://discourse.nodered.org/u/xentity)\
**Replies:** 3\
**Last updated:** [2 July 2018 18:12 UTC](https://discourse.nodered.org/t/quering-the-pfod-protocol-or-any-other-tcp-protocol/1225 "2018-07-02T18:12:42Z")

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The ArduMower project uses the so called PFOD protocol to communicate via bluetooth and wifi. The ESP8266 provides a TCP Server and I am already able to connect to the TCP Server. However, I am not able to query the dev…

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## [Limit number of connection on tcp in node](https://discourse.nodered.org/t/limit-number-of-connection-on-tcp-in-node/1141)

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**Author:** [@EddieChun](https://discourse.nodered.org/u/EddieChun)\
**Replies:** 1\
**Last updated:** [2 July 2018 13:52 UTC](https://discourse.nodered.org/t/limit-number-of-connection-on-tcp-in-node/1141 "2018-07-02T13:52:12Z")

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Hi guys, I’m using the tcp-in node in “listen on” mode and I need to limit the number of simultaneous connections it can handle. How can I do this? Thanks for the help in advance!

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## [Node Red Data doesn t store in sqlite](https://discourse.nodered.org/t/node-red-data-doesn-t-store-in-sqlite/1229)

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**Author:** [@YT2310](https://discourse.nodered.org/u/YT2310)\
**Replies:** 7\
**Last updated:** [2 July 2018 10:49 UTC](https://discourse.nodered.org/t/node-red-data-doesn-t-store-in-sqlite/1229 "2018-07-02T10:49:10Z")

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Hello, I am using a sqlite databank to store a few datas in there and getting them into a dashboard. But after my Pi breakdown and reboot, the data are not store. There is the following error in Node red: " Error: SQL…

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## [Node-Red DropBox Proxy (Windows)](https://discourse.nodered.org/t/node-red-dropbox-proxy-windows/1146)

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**Author:** [@david.glaister](https://discourse.nodered.org/u/david.glaister)\
**Replies:** 3\
**Last updated:** [2 July 2018 08:12 UTC](https://discourse.nodered.org/t/node-red-dropbox-proxy-windows/1146 "2018-07-02T08:12:39Z")

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I have been asked to develop a Node-Red flow to interact with DropBox. Using the DropBox node, I can upload and download, however, when I am connected via the corporate network I experience what appears to be connection…

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## [Cannot delete Projects \<Git Remote\>](https://discourse.nodered.org/t/cannot-delete-projects-git-remote/1222)

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**Author:** [@IoTPlay](https://discourse.nodered.org/u/IoTPlay)\
**Replies:** 1\
**Last updated:** [1 July 2018 20:03 UTC](https://discourse.nodered.org/t/cannot-delete-projects-git-remote/1222 "2018-07-01T20:03:05Z")

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Hi, I have a project on BitBucket, which I clone down to RPi into the folders as required by the Projects feature, plus add the keys of the project in …/projects/.sshkeys, then start-up Node-RED, which works well. Howev…

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## [Topic not working SORRY! Not it is working](https://discourse.nodered.org/t/topic-not-working-sorry-not-it-is-working/1214)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 7\
**Last updated:** [1 July 2018 12:22 UTC](https://discourse.nodered.org/t/topic-not-working-sorry-not-it-is-working/1214 "2018-07-01T12:22:29Z")

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AARRGGHH! Believe me, it wasn’t working. Only after I posted it did it start to work. I am frantically looking how to delete the thread/post, but it still eludes me. Sorry folks, I’m stuck - again. Problem: Two sig…

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## [Is there a way to set the usename of mqtt dynamically](https://discourse.nodered.org/t/is-there-a-way-to-set-the-usename-of-mqtt-dynamically/1215)

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**Author:** [@dilepa](https://discourse.nodered.org/u/dilepa)\
**Replies:** 2\
**Last updated:** [1 July 2018 08:27 UTC](https://discourse.nodered.org/t/is-there-a-way-to-set-the-usename-of-mqtt-dynamically/1215 "2018-07-01T08:27:22Z")

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I want to set the mqtt username dynamically using the default node red mqtt node? Any hits as to how i can do it? Thanks

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## [Problems installing openzwave on Node Red](https://discourse.nodered.org/t/problems-installing-openzwave-on-node-red/1194)

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**Author:** [@SteveMann](https://discourse.nodered.org/u/SteveMann)\
**Replies:** 0\
**Last updated:** [29 June 2018 21:49 UTC](https://discourse.nodered.org/t/problems-installing-openzwave-on-node-red/1194 "2018-06-29T21:49:31Z")

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I’ve just spent most of a day trying to install openzwave for Node Red on my Pi 3. I am hopelessly lost, and worse, the instructions I’ve found conflict with each other. I never even got to install openzwave, the prere…

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## [Beginner help with configuring Current State node](https://discourse.nodered.org/t/beginner-help-with-configuring-current-state-node/1192)

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**Author:** [@donvan57](https://discourse.nodered.org/u/donvan57)\
**Replies:** 2\
**Last updated:** [29 June 2018 17:48 UTC](https://discourse.nodered.org/t/beginner-help-with-configuring-current-state-node/1192 "2018-06-29T17:48:26Z")

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I’m new to Node-RED but love it so far. Here’s the problem that I’m running into. I’m trying to use a “current state” node (api-current-state) to check the state of binary.sensor #2 upon receiving a trigger node output…

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## [Node-RED no longer installed in Rasbian by default?](https://discourse.nodered.org/t/node-red-no-longer-installed-in-rasbian-by-default/1178)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 5\
**Last updated:** [29 June 2018 17:31 UTC](https://discourse.nodered.org/t/node-red-no-longer-installed-in-rasbian-by-default/1178 "2018-06-29T17:31:09Z")

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Looks like Node-RED has been removed from the default build for Rasbian. Not a big issue as it says it is now one of the recommended applications. A new installer has been included for recommended apps. Not tried this,…

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## [How to determine source of an event for manual override?](https://discourse.nodered.org/t/how-to-determine-source-of-an-event-for-manual-override/1167)

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**Author:** [@emlarsen](https://discourse.nodered.org/u/emlarsen)\
**Replies:** 4\
**Last updated:** [29 June 2018 14:01 UTC](https://discourse.nodered.org/t/how-to-determine-source-of-an-event-for-manual-override/1167 "2018-06-29T14:01:22Z")

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I have a smart switch that controls an exhaust fan. I have a flow that compares outside temp to inside temp and if the outside is cooler than inside it turns the fan on. My issue is this - I want to allow the switch to m…

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## [Sync Modbus Polling Nodes](https://discourse.nodered.org/t/sync-modbus-polling-nodes/1179)

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**Author:** [@BowenWT](https://discourse.nodered.org/u/BowenWT)\
**Replies:** 1\
**Last updated:** [29 June 2018 12:27 UTC](https://discourse.nodered.org/t/sync-modbus-polling-nodes/1179 "2018-06-29T12:27:01Z")

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Hi there, Is there a way to sync the polling of modbus nodes so when the data is stored in the columns they stay the same for each poll? Can you assign them by each the payload for each individual msg.topic?

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## [Simple arduino-node red project](https://discourse.nodered.org/t/simple-arduino-node-red-project/1173)

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**Author:** [@shahrunaim](https://discourse.nodered.org/u/shahrunaim)\
**Replies:** 2\
**Last updated:** [29 June 2018 10:07 UTC](https://discourse.nodered.org/t/simple-arduino-node-red-project/1173 "2018-06-29T10:07:57Z")

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hello everyone. I’m working with DHT11 sensor to monitor the temperature. However i need to add control limits, such as the buzzer will buzz if temp exceed the limits. does anyone know any flow that might be work? TQ

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## [Running node-red offline](https://discourse.nodered.org/t/running-node-red-offline/1177)

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**Author:** [@ThanosMel](https://discourse.nodered.org/u/ThanosMel)\
**Replies:** 1\
**Last updated:** [29 June 2018 08:32 UTC](https://discourse.nodered.org/t/running-node-red-offline/1177 "2018-06-29T08:32:01Z")

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Is it possible to run node-red without internet access? I want to do some simple file handling on a system without internet access, the only mean that i ll use for communication is bluetooth. Also i want to ask if there …

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## [Disk free in raspberry pi](https://discourse.nodered.org/t/disk-free-in-raspberry-pi/1156)

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**Author:** [@davidcgu](https://discourse.nodered.org/u/davidcgu)\
**Replies:** 10\
**Last updated:** [28 June 2018 16:11 UTC](https://discourse.nodered.org/t/disk-free-in-raspberry-pi/1156 "2018-06-28T16:11:12Z")

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Good afternoon In order to have the free disk left over control … If I make df -h I get as return: Filesystem Size Used Avail Use% Mounted on /dev/root 15G 6.6G 7.0G 49% / devtmpfs 460M 0 …

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