# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=926

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

**Page:** 927

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## [OpenZwave ==\> keeps reconnecting](https://discourse.nodered.org/t/openzwave-keeps-reconnecting/5405)

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**Author:** [@NickB](https://discourse.nodered.org/u/NickB)\
**Replies:** 24\
**Last updated:** [25 December 2018 14:58 UTC](https://discourse.nodered.org/t/openzwave-keeps-reconnecting/5405 "2018-12-25T14:58:50Z")

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Hi, I have a Zwave stick from Aeotec. In the past, after many attempts I got the OpenZwave node working in node-red, which is running on a raspberrypi Then I had a major crash on my node-red, I was not up-to-date with…

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## [MQTT and smart devices. Project idea for charging them](https://discourse.nodered.org/t/mqtt-and-smart-devices-project-idea-for-charging-them/6052)

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**Author:** [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Replies:** 4\
**Last updated:** [25 December 2018 03:03 UTC](https://discourse.nodered.org/t/mqtt-and-smart-devices-project-idea-for-charging-them/6052 "2018-12-25T03:03:29Z")

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A little project I thought of: People have a lot of "smart devices" (aka Phones, etc). I'm not going to go into the topic of batteries and overcharging. That is a topic unto itself. But I was thinking. (This will r…

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## [Debug stop working until restart](https://discourse.nodered.org/t/debug-stop-working-until-restart/6101)

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**Author:** [@mauog](https://discourse.nodered.org/u/mauog)\
**Replies:** 2\
**Last updated:** [25 December 2018 00:30 UTC](https://discourse.nodered.org/t/debug-stop-working-until-restart/6101 "2018-12-25T00:30:46Z")

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Hello, I'am using node-RED in a container on a Pi. I realised that debug information stop working after some time, I can no longer see in the debug windows any message. To fix the problem I have to restart the containe…

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## [Sqlite doesn t work after update](https://discourse.nodered.org/t/sqlite-doesn-t-work-after-update/1830)

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**Author:** [@YT2310](https://discourse.nodered.org/u/YT2310)\
**Replies:** 14\
**Last updated:** [24 December 2018 23:04 UTC](https://discourse.nodered.org/t/sqlite-doesn-t-work-after-update/1830 "2018-12-24T23:04:07Z")

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Hello, I install the new npm update for sqlite but now there is the following error, does any one now how to fix this? Error: Cannot find module '/home/pi/.node-red/node\_modules/sqlite3/lib/binding/node-v57-linux-arm/n…

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## [Link Node don t find new links](https://discourse.nodered.org/t/link-node-don-t-find-new-links/1968)

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**Author:** [@YT2310](https://discourse.nodered.org/u/YT2310)\
**Replies:** 7\
**Last updated:** [24 December 2018 16:33 UTC](https://discourse.nodered.org/t/link-node-don-t-find-new-links/1968 "2018-12-24T16:33:15Z")

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Hey there, I use some link-out and link-in nodes to connect some flows.. Now i tried to create a new connection but my new link-out-node isn t shown in the link-in-node configuration. have any one an idea? picture

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## [Node-red-start on raspberry pi not working](https://discourse.nodered.org/t/node-red-start-on-raspberry-pi-not-working/185)

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**Author:** [@hary](https://discourse.nodered.org/u/hary)\
**Replies:** 31\
**Last updated:** [24 December 2018 16:28 UTC](https://discourse.nodered.org/t/node-red-start-on-raspberry-pi-not-working/185 "2018-12-24T16:28:15Z")

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Hi to everybody. I had to upgrade nodejs and npm to latest version to be able to use MCP4725 digital to analog converter library on my Raspbian RPi on Stretch. https://github.com/ncd-io/ncd-red-mcp4725 And now, node r…

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## [Join node missing](https://discourse.nodered.org/t/join-node-missing/6110)

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**Author:** [@Spinky](https://discourse.nodered.org/u/Spinky)\
**Replies:** 5\
**Last updated:** [24 December 2018 12:07 UTC](https://discourse.nodered.org/t/join-node-missing/6110 "2018-12-24T12:07:55Z")

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Sorry bit of a noob question but I need to combine the output of two nodes and the ‘Join’ node would seem to be the one to use - except I don’t have it on the palette! Is this a standard node and if so why don’t I have i…

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## [Node-Red: Unexpected connection to amazonaws.com](https://discourse.nodered.org/t/node-red-unexpected-connection-to-amazonaws-com/6093)

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**Author:** [@John](https://discourse.nodered.org/u/John)\
**Replies:** 8\
**Last updated:** [23 December 2018 23:22 UTC](https://discourse.nodered.org/t/node-red-unexpected-connection-to-amazonaws-com/6093 "2018-12-23T23:22:34Z")

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Hi, I have been running node-red on my raspberry pi for some time now just doing some basic stuff. It is all supposed to be within my private LAN so I was surprised to see a connection to an Amazon node: $ sudo netstat…

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## [Inserting characeter before payload is sent](https://discourse.nodered.org/t/inserting-characeter-before-payload-is-sent/6075)

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**Author:** [@patrolin](https://discourse.nodered.org/u/patrolin)\
**Replies:** 5\
**Last updated:** [23 December 2018 23:20 UTC](https://discourse.nodered.org/t/inserting-characeter-before-payload-is-sent/6075 "2018-12-23T23:20:59Z")

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just wondering if anyone can point me in the right direction, all i want to do is use the color picker to give me the hex value but i want to add a # to the payload before the hex number as its being sent out. cheers

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## [Stuck on local alexa and HASS .IO](https://discourse.nodered.org/t/stuck-on-local-alexa-and-hass-io/6096)

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**Author:** [@mitchell](https://discourse.nodered.org/u/mitchell)\
**Replies:** 3\
**Last updated:** [23 December 2018 21:28 UTC](https://discourse.nodered.org/t/stuck-on-local-alexa-and-hass-io/6096 "2018-12-23T21:28:49Z")

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i have spent a about 17 hours so far trying to work this all out :slightly\_frowning\_face: All i am trying to so is with node-red-contrib-alexa-local, is, when i turn on the emulated light, trigger a script from Home as…

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## [Help with splitting a payload](https://discourse.nodered.org/t/help-with-splitting-a-payload/6043)

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**Author:** [@Lost](https://discourse.nodered.org/u/Lost)\
**Replies:** 31\
**Last updated:** [23 December 2018 17:24 UTC](https://discourse.nodered.org/t/help-with-splitting-a-payload/6043 "2018-12-23T17:24:05Z")

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I am a new Node red and java user. I am a bit lost and confused when trying to use the function node to split a payload into seperate variables. I am sucsessful in using nodered to send light commands from openhab to H…

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## [(Error)Node Red with sensortag and raspberry pi](https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084)

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**Author:** [@rylccn](https://discourse.nodered.org/u/rylccn)\
**Replies:** 1\
**Last updated:** [23 December 2018 12:02 UTC](https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084 "2018-12-23T12:02:38Z")

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I am trying to follow the instruction from https://www.hackster.io/rei-vilo/sensortag-to-blynk-using-node-red-f90c4d but the raspberry pi cannot detect the sensortag after node-red-start. I guess it is related to the fo…

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## [How to insert a Timestamp in a CSV for each parsed tweet](https://discourse.nodered.org/t/how-to-insert-a-timestamp-in-a-csv-for-each-parsed-tweet/5733)

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**Author:** [@Kypez](https://discourse.nodered.org/u/Kypez)\
**Replies:** 6\
**Last updated:** [22 December 2018 23:19 UTC](https://discourse.nodered.org/t/how-to-insert-a-timestamp-in-a-csv-for-each-parsed-tweet/5733 "2018-12-22T23:19:15Z")

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Dear community, i am new to Node Red and hope that my question is not too obvious. However, i did not find any thread, related to my current challange. So what i am currently doing is a twitter parser to CSV. Parsing f…

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## [When is a the flow saved](https://discourse.nodered.org/t/when-is-a-the-flow-saved/6066)

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**Author:** [@drmacro](https://discourse.nodered.org/u/drmacro)\
**Replies:** 6\
**Last updated:** [22 December 2018 22:58 UTC](https://discourse.nodered.org/t/when-is-a-the-flow-saved/6066 "2018-12-22T22:58:07Z")

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I'm sure this has been asked many times...but, my search terms didn't find me an answer... :frowning: When is a flow saved? (it is saved to a .json file right?) Is it saved when you hit deploy? And what determines the …

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## [Problem calling context data from template node \[Solved\]](https://discourse.nodered.org/t/problem-calling-context-data-from-template-node-solved/6056)

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**Author:** [@9886815d5d5c584c03d8](https://discourse.nodered.org/u/9886815d5d5c584c03d8)\
**Replies:** 2\
**Last updated:** [22 December 2018 21:34 UTC](https://discourse.nodered.org/t/problem-calling-context-data-from-template-node-solved/6056 "2018-12-22T21:34:03Z")

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Hey, I am having trouble recalling context data (a url) from a template node and wondered if anyone else has had this problem. I am able to successfully store and recall the context data with function nodes but when I …

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## [How to create automatic mqtt](https://discourse.nodered.org/t/how-to-create-automatic-mqtt/6069)

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**Author:** [@iotteknoloji](https://discourse.nodered.org/u/iotteknoloji)\
**Replies:** 1\
**Last updated:** [22 December 2018 19:45 UTC](https://discourse.nodered.org/t/how-to-create-automatic-mqtt/6069 "2018-12-22T19:45:04Z")

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Hi, I want to design smart home systems. But I have a problem. I have too many devices. and all of these devices will be sold to different people. user needs to add node-red e device with simple settings. I can introduce…

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## [Installing udmx node](https://discourse.nodered.org/t/installing-udmx-node/5165)

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**Author:** [@nick](https://discourse.nodered.org/u/nick)\
**Replies:** 9\
**Last updated:** [22 December 2018 16:16 UTC](https://discourse.nodered.org/t/installing-udmx-node/5165 "2018-12-22T16:16:39Z")

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if i wat to install the npm i node-red-contrib-udmx node i get a error. does sombody know why? i am using a rbp 3b.

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## [Connect node-red on raspberry to OPC server on other PC same network](https://discourse.nodered.org/t/connect-node-red-on-raspberry-to-opc-server-on-other-pc-same-network/5955)

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**Author:** [@gaara7271](https://discourse.nodered.org/u/gaara7271)\
**Replies:** 17\
**Last updated:** [22 December 2018 13:34 UTC](https://discourse.nodered.org/t/connect-node-red-on-raspberry-to-opc-server-on-other-pc-same-network/5955 "2018-12-22T13:34:44Z")

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Hi everyone, i connected node-red to OPC server same machine PC windown, but i can't connect node-red on raspberry to OPC on PC same network. Can i help you ? what should i do ? Thank you

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## [Openhab Presence monitoring](https://discourse.nodered.org/t/openhab-presence-monitoring/6053)

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**Author:** [@Shadowbreed](https://discourse.nodered.org/u/Shadowbreed)\
**Replies:** 2\
**Last updated:** [22 December 2018 07:16 UTC](https://discourse.nodered.org/t/openhab-presence-monitoring/6053 "2018-12-22T07:16:15Z")

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I am rather new at Node-red (as in I installed it yesterday) so this is probably extremely simple, but I can't for the life of me figure it out.. I am trying to set up some simple presence monitoring logic. I am pullin…

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## [How to simulate (inject) full message object](https://discourse.nodered.org/t/how-to-simulate-inject-full-message-object/6048)

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**Author:** [@hazymat](https://discourse.nodered.org/u/hazymat)\
**Replies:** 2\
**Last updated:** [22 December 2018 01:00 UTC](https://discourse.nodered.org/t/how-to-simulate-inject-full-message-object/6048 "2018-12-22T01:00:41Z")

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Two parts to this question, one is a theoretical question, the other a practical question. I have the Dark Sky node plugged into a function, which uses a for-loop to build an array, which I can then output to a dashboar…

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## [Other platforms for Node red](https://discourse.nodered.org/t/other-platforms-for-node-red/6007)

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**Author:** [@Rahul\_Mathavan](https://discourse.nodered.org/u/Rahul_Mathavan)\
**Replies:** 3\
**Last updated:** [21 December 2018 22:46 UTC](https://discourse.nodered.org/t/other-platforms-for-node-red/6007 "2018-12-21T22:46:29Z")

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IBM bluemix is an IoT platform for Node-RED. I want to know what are the other platforms which can be used for the Internet of things in Node-RED.

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## [Ads1115 and 0-5 volt pressure sensor](https://discourse.nodered.org/t/ads1115-and-0-5-volt-pressure-sensor/5576)

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**Author:** [@mason08](https://discourse.nodered.org/u/mason08)\
**Replies:** 18\
**Last updated:** [21 December 2018 22:44 UTC](https://discourse.nodered.org/t/ads1115-and-0-5-volt-pressure-sensor/5576 "2018-12-21T22:44:11Z")

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Im trying to get a 0-5 volt pressure sensor to interface with the pi. I have the ads1115 node in node red and have it connected with no issues and it is displaying data. My issue is what its displaying. Currently it s…

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## [CRASHES NODE-RED Multiple dashboards oppened in any brownser](https://discourse.nodered.org/t/crashes-node-red-multiple-dashboards-oppened-in-any-brownser/6034)

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**Author:** [@RogerioCassares](https://discourse.nodered.org/u/RogerioCassares)\
**Replies:** 6\
**Last updated:** [21 December 2018 22:41 UTC](https://discourse.nodered.org/t/crashes-node-red-multiple-dashboards-oppened-in-any-brownser/6034 "2018-12-21T22:41:35Z")

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Hi node-guys i am with some trouble and accessing my dashboard takes the memory out of control and crashes node-red service. I think most of us use dashboard for something and i would like to know if you have some troubl…

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## [Can any one help on embedding node-red in java process](https://discourse.nodered.org/t/can-any-one-help-on-embedding-node-red-in-java-process/3856)

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**Author:** [@shwetha](https://discourse.nodered.org/u/shwetha)\
**Replies:** 6\
**Last updated:** [3 December 2018 11:01 UTC](https://discourse.nodered.org/t/can-any-one-help-on-embedding-node-red-in-java-process/3856 "2018-12-03T11:01:23Z")

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I am new to Node.js/Node-RED. we have a requirement where we need to embed node-RED modules under java process. From some blog i could understand that J2V8 make it possible to run Node.js and JVM in a single process. S…

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## [Node-red lost connection to the server with new node](https://discourse.nodered.org/t/node-red-lost-connection-to-the-server-with-new-node/6042)

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**Author:** [@beginnercoder](https://discourse.nodered.org/u/beginnercoder)\
**Replies:** 1\
**Last updated:** [21 December 2018 16:23 UTC](https://discourse.nodered.org/t/node-red-lost-connection-to-the-server-with-new-node/6042 "2018-12-21T16:23:44Z")

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I have to connect to Sparql endpoint and query RDF via Node-red. I found an add-on node called "node-red-contrib-sparql" which enables that. I am able to install the node. I downloaded python and install required librari…

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## [Function with different values in different times](https://discourse.nodered.org/t/function-with-different-values-in-different-times/6024)

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**Author:** [@Lance99](https://discourse.nodered.org/u/Lance99)\
**Replies:** 4\
**Last updated:** [21 December 2018 13:09 UTC](https://discourse.nodered.org/t/function-with-different-values-in-different-times/6024 "2018-12-21T13:09:03Z")

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I want to calculate an equation with 3 variables. The variable are coming asynchrone so I have to stor the latest values and then calculate the equation. Then output the result. Then wait for a new next value and then ca…

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## [Extract value from serial port string data](https://discourse.nodered.org/t/extract-value-from-serial-port-string-data/5777)

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**Author:** [@iotkismec](https://discourse.nodered.org/u/iotkismec)\
**Replies:** 2\
**Last updated:** [21 December 2018 04:30 UTC](https://discourse.nodered.org/t/extract-value-from-serial-port-string-data/5777 "2018-12-21T04:30:01Z")

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Hi All, I got a data from PLC using serial communication. The data that i got is @00EX01520063FFFF5E\*. How can i extract value from the buffer. I just need the data in between @00EX and 5E\* .

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## [Status/dashboard (ui\_text) bug](https://discourse.nodered.org/t/status-dashboard-ui-text-bug/6002)

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**Author:** [@drmibell](https://discourse.nodered.org/u/drmibell)\
**Replies:** 3\
**Last updated:** [20 December 2018 22:01 UTC](https://discourse.nodered.org/t/status-dashboard-ui-text-bug/6002 "2018-12-20T22:01:53Z")

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Running NR 0.19.5 and dashboard 2.12.2, this flow throws an error from the ui\_text node labelled "status": "TypeError: Cannot read property 'toString' of undefined". I have confirmed that there is no error using dashboar…

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## [Updating a live system from a development node-red](https://discourse.nodered.org/t/updating-a-live-system-from-a-development-node-red/5998)

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**Author:** [@kilnageer](https://discourse.nodered.org/u/kilnageer)\
**Replies:** 2\
**Last updated:** [20 December 2018 20:48 UTC](https://discourse.nodered.org/t/updating-a-live-system-from-a-development-node-red/5998 "2018-12-20T20:48:44Z")

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Sorry in advance if this has been answered already. But I searched and couldn't find it :slight\_smile: I have two Linux based systems: a live RPI Rasbian one and a development Lubuntu one. When I deploy my latest devel…

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## [Change the dimension of PDF file](https://discourse.nodered.org/t/change-the-dimension-of-pdf-file/5986)

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**Author:** [@hathemi](https://discourse.nodered.org/u/hathemi)\
**Replies:** 1\
**Last updated:** [20 December 2018 14:51 UTC](https://discourse.nodered.org/t/change-the-dimension-of-pdf-file/5986 "2018-12-20T14:51:15Z")

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i have created a pdf file using this node node-red-contrib-pdf i want to change the dimension of file to A3 or A2 .. any ideas ? And thank you !

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