# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=856

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

**Page:** 857

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## [Node-red-contrib-i2c & Seeed Raspi Relay Board](https://discourse.nodered.org/t/node-red-contrib-i2c-seeed-raspi-relay-board/14316)

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**Author:** [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Replies:** 10\
**Last updated:** [19 August 2019 10:32 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c-seeed-raspi-relay-board/14316 "2019-08-19T10:32:25Z")

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I am trying to switch the seeed relay Board (4 relays) with node-red-contrib-i2c. Does anybody already successfully run this relay board with node-red? I only have a Python program and have problems to extract the comma…

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## [Ultrasonic data conversion](https://discourse.nodered.org/t/ultrasonic-data-conversion/14540)

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**Author:** [@Iliyas](https://discourse.nodered.org/u/Iliyas)\
**Replies:** 6\
**Last updated:** [20 August 2019 10:24 UTC](https://discourse.nodered.org/t/ultrasonic-data-conversion/14540 "2019-08-20T10:24:53Z")

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How to convert the data into readable format?

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## [Beginner tutorial for running Node-RED on bluemix with develop locally - deploy globally workflow](https://discourse.nodered.org/t/beginner-tutorial-for-running-node-red-on-bluemix-with-develop-locally-deploy-globally-workflow/14543)

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**Author:** [@vittali](https://discourse.nodered.org/u/vittali)\
**Replies:** 0\
**Last updated:** [20 August 2019 10:13 UTC](https://discourse.nodered.org/t/beginner-tutorial-for-running-node-red-on-bluemix-with-develop-locally-deploy-globally-workflow/14543 "2019-08-20T10:13:25Z")

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After lots of support from Nick - thanks for your patience - I put toegether a small getting started tutorial that shows how to get up and running with Node-RED on Bluemix. It is based on blog posts by Nick: Creating …

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## [How to create a new application at domotic](https://discourse.nodered.org/t/how-to-create-a-new-application-at-domotic/14537)

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**Author:** [@Tokross](https://discourse.nodered.org/u/Tokross)\
**Replies:** 2\
**Last updated:** [20 August 2019 09:31 UTC](https://discourse.nodered.org/t/how-to-create-a-new-application-at-domotic/14537 "2019-08-20T09:31:47Z")

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Hello! I am new on the forum I like to know how to use nod red and make applications in home automation. I am a networker.

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## [Problem Update Data in Multiple Line Chart](https://discourse.nodered.org/t/problem-update-data-in-multiple-line-chart/11351)

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**Author:** [@mrizkywiguna](https://discourse.nodered.org/u/mrizkywiguna)\
**Replies:** 2\
**Last updated:** [20 August 2019 09:16 UTC](https://discourse.nodered.org/t/problem-update-data-in-multiple-line-chart/11351 "2019-08-20T09:16:45Z")

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Hi All, I've problem with my project to create line chart. This chart combine in fix circle data and real time data, but the real time data doesn't work each the input data is updated. It only moving point to point, not…

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## [Node-RED on Bluemix: how to serve ui as root w/o showing editor](https://discourse.nodered.org/t/node-red-on-bluemix-how-to-serve-ui-as-root-w-o-showing-editor/14531)

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**Author:** [@vittali](https://discourse.nodered.org/u/vittali)\
**Replies:** 1\
**Last updated:** [20 August 2019 09:09 UTC](https://discourse.nodered.org/t/node-red-on-bluemix-how-to-serve-ui-as-root-w-o-showing-editor/14531 "2019-08-20T09:09:32Z")

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Hi When running Node-RED on Bluemix based on the develop-local suggested workflow by Nick, I would like to serve only the /ui path when running on the cloud and make the editor (including the login in screen unavailable…

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## [How To Get Connections Number For TCP In Node?](https://discourse.nodered.org/t/how-to-get-connections-number-for-tcp-in-node/14231)

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**Author:** [@mrizkywiguna](https://discourse.nodered.org/u/mrizkywiguna)\
**Replies:** 7\
**Last updated:** [20 August 2019 09:06 UTC](https://discourse.nodered.org/t/how-to-get-connections-number-for-tcp-in-node/14231 "2019-08-20T09:06:32Z")

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Hi All, Is there a way to know the number of connections of TCP In Node? Because i want to make status if the TCP is connected or not connected. Regards, mrizky

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## [Splitting data from msg.payload](https://discourse.nodered.org/t/splitting-data-from-msg-payload/14473)

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**Author:** [@benjamingotke](https://discourse.nodered.org/u/benjamingotke)\
**Replies:** 11\
**Last updated:** [20 August 2019 08:09 UTC](https://discourse.nodered.org/t/splitting-data-from-msg-payload/14473 "2019-08-20T08:09:57Z")

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Hi All I'm trying to get values from Victron Ve.Direct USB device, but I have troubles spitting the informations to value I can use in the Node-Red Dashboard. From the Ve.Direct USB i'm getting following informations: …

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## [Updating Node-RED on IBM Cloud](https://discourse.nodered.org/t/updating-node-red-on-ibm-cloud/9671)

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**Author:** [@mascapollo](https://discourse.nodered.org/u/mascapollo)\
**Replies:** 1\
**Last updated:** [20 August 2019 07:52 UTC](https://discourse.nodered.org/t/updating-node-red-on-ibm-cloud/9671 "2019-08-20T07:52:37Z")

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I upgraded node red to 0.20.3 on IBM Cloud using the instructions in this link: https://nodered.org/docs/platforms/bluemix Then I got an error saying that for node-red-node-email 1.3.0 needs node.js version \>=8. So I e…

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## [Flow for mqtt and domotic](https://discourse.nodered.org/t/flow-for-mqtt-and-domotic/14505)

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**Author:** [@pvanklink](https://discourse.nodered.org/u/pvanklink)\
**Replies:** 0\
**Last updated:** [19 August 2019 20:53 UTC](https://discourse.nodered.org/t/flow-for-mqtt-and-domotic/14505 "2019-08-19T20:53:27Z")

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Hi, i like to pass complex IFTTT body content like this: \[{"obj":"lantaarn1","act":"On"},{"obj":"lantaarn2","act":"On"}\] in a variable (msg.payload.value = "compex received ifttt body" as it is from IFTTT to MQTTT/dom…

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## [JSON RESTful API into Node Red via POST, out using UDP Node](https://discourse.nodered.org/t/json-restful-api-into-node-red-via-post-out-using-udp-node/14234)

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**Author:** [@fisha462](https://discourse.nodered.org/u/fisha462)\
**Replies:** 2\
**Last updated:** [19 August 2019 22:22 UTC](https://discourse.nodered.org/t/json-restful-api-into-node-red-via-post-out-using-udp-node/14234 "2019-08-19T22:22:55Z")

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Hi all, very very new to node-red here. I have a device that will POST data to an endpoint. I then need to parse out specific values, convert to ASCII, and encapsulate in a UDP or TCP configured unicast. It seems like …

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## [Stuck with change node](https://discourse.nodered.org/t/stuck-with-change-node/14465)

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**Author:** [@wb666greene](https://discourse.nodered.org/u/wb666greene)\
**Replies:** 10\
**Last updated:** [19 August 2019 21:47 UTC](https://discourse.nodered.org/t/stuck-with-change-node/14465 "2019-08-19T21:47:02Z")

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I'm having issues with the second change node. I can't seem to get the syntax right for it to work. Its a simple flow, I may be abusing MQTT by embedding data in the topic, but it seems to work quite well except I can'…

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## [Buffering tweets](https://discourse.nodered.org/t/buffering-tweets/14477)

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**Author:** [@yzerman](https://discourse.nodered.org/u/yzerman)\
**Replies:** 14\
**Last updated:** [19 August 2019 20:49 UTC](https://discourse.nodered.org/t/buffering-tweets/14477 "2019-08-19T20:49:49Z")

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Hello, i have a flow that listen for tweets and controlling servo. Do you please give me suggestions what can i need to do to prevent when many tweets are send at the same time. May be i need to put delay node after twi…

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## [Authentication Control](https://discourse.nodered.org/t/authentication-control/14492)

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**Author:** [@rwiest](https://discourse.nodered.org/u/rwiest)\
**Replies:** 2\
**Last updated:** [19 August 2019 19:32 UTC](https://discourse.nodered.org/t/authentication-control/14492 "2019-08-19T19:32:24Z")

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Hello, is there any flow that I can use as authentication control between two types of users? Where can each access specific information?

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## [Extra Characters after base64 Decoding](https://discourse.nodered.org/t/extra-characters-after-base64-decoding/14498)

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**Author:** [@Manjot](https://discourse.nodered.org/u/Manjot)\
**Replies:** 5\
**Last updated:** [19 August 2019 17:35 UTC](https://discourse.nodered.org/t/extra-characters-after-base64-decoding/14498 "2019-08-19T17:35:40Z")

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Hi I am reading accelerometer data from chip and sending it to the server and my node red is subscribed to the topic that reads the accelerometer data. In Node Red, I am using function node with the following code: va…

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## [Problem with context](https://discourse.nodered.org/t/problem-with-context/14500)

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**Author:** [@jayheavner](https://discourse.nodered.org/u/jayheavner)\
**Replies:** 2\
**Last updated:** [19 August 2019 17:21 UTC](https://discourse.nodered.org/t/problem-with-context/14500 "2019-08-19T17:21:03Z")

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I'm running node-red under Docker. I'm trying to use the filesystem for my global context. My node-red volume is mounted to :/data:Z I've set my settings.js as... contextStorage: { storeInFile: { module…

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## [Help - how can I reduce memory footprint of node-red](https://discourse.nodered.org/t/help-how-can-i-reduce-memory-footprint-of-node-red/14376)

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**Author:** [@odys](https://discourse.nodered.org/u/odys)\
**Replies:** 10\
**Last updated:** [19 August 2019 17:04 UTC](https://discourse.nodered.org/t/help-how-can-i-reduce-memory-footprint-of-node-red/14376 "2019-08-19T17:04:10Z")

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Hey everyone, I am currently working on a PoC device-service for the EdgeX project, in essence the node-red service is a RESTful glue between the EdgeX IoT platform and lora-app-server. It consists of 2 flows that will…

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## [Modbus many devices](https://discourse.nodered.org/t/modbus-many-devices/14483)

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**Author:** [@petrdolejs](https://discourse.nodered.org/u/petrdolejs)\
**Replies:** 0\
**Last updated:** [19 August 2019 10:20 UTC](https://discourse.nodered.org/t/modbus-many-devices/14483 "2019-08-19T10:20:54Z")

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Hello Node Red community. Is somehow possible to read values from many slaves connected with modbus? And with minimum nodes of course.

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## [Chart.js node - cannot GET TP01](https://discourse.nodered.org/t/chart-js-node-cannot-get-tp01/14457)

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**Author:** [@EdwardDM10](https://discourse.nodered.org/u/EdwardDM10)\
**Replies:** 9\
**Last updated:** [19 August 2019 09:41 UTC](https://discourse.nodered.org/t/chart-js-node-cannot-get-tp01/14457 "2019-08-19T09:41:02Z")

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Again, total newbie so pointers would be most welcome. I've downloaded this - ...but am struggling to get it to work. I've set up the flow as per the example on the page (I think) and put it on a 30 second trigger. …

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## [Help with twitter node and servo](https://discourse.nodered.org/t/help-with-twitter-node-and-servo/14450)

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**Author:** [@yzerman](https://discourse.nodered.org/u/yzerman)\
**Replies:** 9\
**Last updated:** [19 August 2019 09:03 UTC](https://discourse.nodered.org/t/help-with-twitter-node-and-servo/14450 "2019-08-19T09:03:52Z")

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Hello, i have a problem with flow that controls servo motor via twitter node. When i receive tweet with given keyword the servo should go at 120 waits 5s. and goes to 0. The problem is that i receive error in my debug …

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## [Struggling with Google Calendar on 2nd NR instance](https://discourse.nodered.org/t/struggling-with-google-calendar-on-2nd-nr-instance/14471)

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**Author:** [@michaelblight](https://discourse.nodered.org/u/michaelblight)\
**Replies:** 1\
**Last updated:** [19 August 2019 08:20 UTC](https://discourse.nodered.org/t/struggling-with-google-calendar-on-2nd-nr-instance/14471 "2019-08-19T08:20:23Z")

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I have the Google Calendar node configured in the Node Red add-on to hass.io. I did this ages ago, so I'm not sure if I had much trouble. Now I want to use the same node in another Node Red Docker install on another mac…

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## [JSON persistence with NodeRed- Redis or PostGreSQL or?](https://discourse.nodered.org/t/json-persistence-with-nodered-redis-or-postgresql-or/11511)

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**Author:** [@tony-shannon](https://discourse.nodered.org/u/tony-shannon)\
**Replies:** 16\
**Last updated:** [19 August 2019 04:50 UTC](https://discourse.nodered.org/t/json-persistence-with-nodered-redis-or-postgresql-or/11511 "2019-08-19T04:50:02Z")

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Dear NodeRed community Could I ask for views/experiences please? As JSON is central to NodeRed, APIs etc, plus a pretty common way to store data now, could I ask for views on what database may be best to use for JSON p…

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## [Bug in node.send?](https://discourse.nodered.org/t/bug-in-node-send/11177)

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**Author:** [@Albatroz](https://discourse.nodered.org/u/Albatroz)\
**Replies:** 6\
**Last updated:** [19 August 2019 04:41 UTC](https://discourse.nodered.org/t/bug-in-node-send/11177 "2019-08-19T04:41:07Z")

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I created a stream where the message goes through a loop and inside the loop I make a node.send on each iteration for the next node to store the information in the file, however the information is repeated several times …

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## [Please disclose contrib node acceptance criteria](https://discourse.nodered.org/t/please-disclose-contrib-node-acceptance-criteria/14464)

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**Author:** [@ianmacs](https://discourse.nodered.org/u/ianmacs)\
**Replies:** 2\
**Last updated:** [18 August 2019 22:13 UTC](https://discourse.nodered.org/t/please-disclose-contrib-node-acceptance-criteria/14464 "2019-08-18T22:13:44Z")

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I created my first contrib node today and had trouble getting it to appear in the palette manager. My last 3 commits were basically wild guesses trying to meet the (seemingly secret) acceptance criteria. My node is final…

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## [Problem with dynamic table in ui\_template](https://discourse.nodered.org/t/problem-with-dynamic-table-in-ui-template/14401)

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**Author:** [@seth350](https://discourse.nodered.org/u/seth350)\
**Replies:** 2\
**Last updated:** [18 August 2019 20:56 UTC](https://discourse.nodered.org/t/problem-with-dynamic-table-in-ui-template/14401 "2019-08-18T20:56:12Z")

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I have a table that is generated in a ui\_template node that is causing me grief. The object of this flow is to process alarms as they occur and add a date-time specifying when the alarm occured and then add the alarm to…

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## [Modbus rtu to modbus tcp bridge](https://discourse.nodered.org/t/modbus-rtu-to-modbus-tcp-bridge/14461)

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**Author:** [@Matthias250881](https://discourse.nodered.org/u/Matthias250881)\
**Replies:** 0\
**Last updated:** [18 August 2019 18:56 UTC](https://discourse.nodered.org/t/modbus-rtu-to-modbus-tcp-bridge/14461 "2019-08-18T18:56:28Z")

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Hello is it possible to bridge a modbus rtu holding register to modbus tcp? I have a Energiemeter with rs485. I can read the holding with Id 1 adress 0 register 3. Can I bridge it to modbus tcp?

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## [Need some help with a varable JSON](https://discourse.nodered.org/t/need-some-help-with-a-varable-json/14210)

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**Author:** [@Flixm](https://discourse.nodered.org/u/Flixm)\
**Replies:** 25\
**Last updated:** [18 August 2019 16:07 UTC](https://discourse.nodered.org/t/need-some-help-with-a-varable-json/14210 "2019-08-18T16:07:19Z")

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Hi, i want to use the slider to set a timer with the time i sent with the slider ... can someone show me how to set the the "template" that the "timeout" is variable. Thanks in advance Felix \[{"id":"64c3829f.e20b0c"…

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## [Upgrading packages via palette bug?](https://discourse.nodered.org/t/upgrading-packages-via-palette-bug/14435)

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**Author:** [@thatcadguy](https://discourse.nodered.org/u/thatcadguy)\
**Replies:** 12\
**Last updated:** [18 August 2019 14:16 UTC](https://discourse.nodered.org/t/upgrading-packages-via-palette-bug/14435 "2019-08-18T14:16:30Z")

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Just used Manage Palette to upgrade 2 packages, tried to restart the Node-RED service and now getting a nothing error message: 17 Aug 16:40:35 - \[info\] Upgrading module: node-red-node-rbe to version: 0.2.5 17 Aug 16:41:…

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## [Updates to Docker Images](https://discourse.nodered.org/t/updates-to-docker-images/7502)

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**Author:** [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Replies:** 5\
**Last updated:** [18 August 2019 13:28 UTC](https://discourse.nodered.org/t/updates-to-docker-images/7502 "2019-08-18T13:28:29Z")

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The current Docker images https://hub.docker.com/r/nodered/node-red-docker still base themselves off node v6 and v8 - and default to the v6 version, unless told otherwise. Obviously we need to move this on somewhat... t…

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## [Project directory path](https://discourse.nodered.org/t/project-directory-path/14424)

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**Author:** [@ianmacs](https://discourse.nodered.org/u/ianmacs)\
**Replies:** 9\
**Last updated:** [18 August 2019 12:05 UTC](https://discourse.nodered.org/t/project-directory-path/14424 "2019-08-18T12:05:44Z")

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Can a node-red flow from a node-red project discover the path to the directory where the project is checked out? I want my flow to call a custom shell script using the exec node and I would prefer to store the shell skr…

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