# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=899

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

**Page:** 900

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## [Problem with using the MQTT node](https://discourse.nodered.org/t/problem-with-using-the-mqtt-node/9688)

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**Author:** [@AAAAnT](https://discourse.nodered.org/u/AAAAnT)\
**Replies:** 3\
**Last updated:** [2 April 2019 13:36 UTC](https://discourse.nodered.org/t/problem-with-using-the-mqtt-node/9688 "2019-04-02T13:36:30Z")

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I'm having a problem with the MQTT node, as the title suggests. I can't give the flow for specific reasons, but it goes about as follows: The flow receives data from a non-problematic MQTT (input) node, with a set IP, …

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## [Timer the Switch with mysql database](https://discourse.nodered.org/t/timer-the-switch-with-mysql-database/9650)

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**Author:** [@hebergeweb](https://discourse.nodered.org/u/hebergeweb)\
**Replies:** 19\
**Last updated:** [2 April 2019 13:33 UTC](https://discourse.nodered.org/t/timer-the-switch-with-mysql-database/9650 "2019-04-02T13:33:13Z")

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Hi, in my flow if I open the switch I go through MySQL database to get the last value of field level after it sends value to the function FN to recover this value as a time remains the switch running. I take an example…

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## [Passing JSON object (as string) to python script (exec node)](https://discourse.nodered.org/t/passing-json-object-as-string-to-python-script-exec-node/9680)

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**Author:** [@elisascheer](https://discourse.nodered.org/u/elisascheer)\
**Replies:** 1\
**Last updated:** [2 April 2019 06:45 UTC](https://discourse.nodered.org/t/passing-json-object-as-string-to-python-script-exec-node/9680 "2019-04-02T06:45:38Z")

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Hi, I have a PLC which sends message object with json object payload. For example : {"payload" : { "DB1" : "value" } } I want to pass msg.payload to an exec python node as an argument. But as we can't pass object dire…

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## [I'm not able to configure the SenseHat to the temperature,SenseHat is showing as disconnected](https://discourse.nodered.org/t/im-not-able-to-configure-the-sensehat-to-the-temperature-sensehat-is-showing-as-disconnected/9476)

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**Author:** [@Anurenjini](https://discourse.nodered.org/u/Anurenjini)\
**Replies:** 11\
**Last updated:** [2 April 2019 07:24 UTC](https://discourse.nodered.org/t/im-not-able-to-configure-the-sensehat-to-the-temperature-sensehat-is-showing-as-disconnected/9476 "2019-04-02T07:24:24Z")

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## [Add category url to palette manager](https://discourse.nodered.org/t/add-category-url-to-palette-manager/134)

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**Author:** [@gbiv4](https://discourse.nodered.org/u/gbiv4)\
**Replies:** 2\
**Last updated:** [2 April 2019 04:36 UTC](https://discourse.nodered.org/t/add-category-url-to-palette-manager/134 "2019-04-02T04:36:25Z")

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Hi all, I’m wanting to add my own nodes that I host somewhere like github, to an instance of node-red. I saw the Palette management UI design wiki and one of the feature requests/design items describes configuring the …

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## [Node-red-node-sensortag not working on Mac OS 10.14.4](https://discourse.nodered.org/t/node-red-node-sensortag-not-working-on-mac-os-10-14-4/9641)

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**Author:** [@piersbarrios](https://discourse.nodered.org/u/piersbarrios)\
**Replies:** 7\
**Last updated:** [1 April 2019 22:11 UTC](https://discourse.nodered.org/t/node-red-node-sensortag-not-working-on-mac-os-10-14-4/9641 "2019-04-01T22:11:37Z")

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Hello, After multiple attempts, I'm turning towards you... I'm trying to use my TI sensortag on Node-Red but it keeps hanging on "discovering..." My sensortag is up and the info on it (physical sticker) is: 1.7.2.8 B…

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## [Modbus TCP and process.env.NODE\_RED\_HOME](https://discourse.nodered.org/t/modbus-tcp-and-process-env-node-red-home/9643)

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**Author:** [@CaptClaude](https://discourse.nodered.org/u/CaptClaude)\
**Replies:** 2\
**Last updated:** [1 April 2019 21:43 UTC](https://discourse.nodered.org/t/modbus-tcp-and-process-env-node-red-home/9643 "2019-04-01T21:43:01Z")

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First: Running Windows 10 and a freshly installed NR with node.js 10.15.3. I am trying to communicate with a Modbus TCP slave and am having some success with the biancode and Argonne-National-Labs contrib nodes. Howeve…

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## [Own custom OAuth/OpenID provider implementation](https://discourse.nodered.org/t/own-custom-oauth-openid-provider-implementation/9658)

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**Author:** [@zsigmondszilveszter](https://discourse.nodered.org/u/zsigmondszilveszter)\
**Replies:** 1\
**Last updated:** [1 April 2019 18:45 UTC](https://discourse.nodered.org/t/own-custom-oauth-openid-provider-implementation/9658 "2019-04-01T18:45:07Z")

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Hello everyone, I need some help if it is possible. Here is the short description of my node-red setup. I want to implement my own custom Passport.js Strategy and use it with node-red. Note: the node-red storage engine …

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## [Looking for workspace dropdown](https://discourse.nodered.org/t/looking-for-workspace-dropdown/9025)

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**Author:** [@Creeps](https://discourse.nodered.org/u/Creeps)\
**Replies:** 11\
**Last updated:** [1 April 2019 18:25 UTC](https://discourse.nodered.org/t/looking-for-workspace-dropdown/9025 "2019-04-01T18:25:19Z")

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Hi @all, I'm looking for a node that provides a dropdown on the workspace (not on the dashboard) to select a data set out of a csv, a json or whatever and send it on to the next node. My idea is to send several hundred…

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## [Automatique or manual mode](https://discourse.nodered.org/t/automatique-or-manual-mode/9651)

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**Author:** [@ihebabidi](https://discourse.nodered.org/u/ihebabidi)\
**Replies:** 10\
**Last updated:** [1 April 2019 12:37 UTC](https://discourse.nodered.org/t/automatique-or-manual-mode/9651 "2019-04-01T12:37:12Z")

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can you help me to create something on node red wich allows the user to chose the automatic mode or the manual mode please?

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## [How to separate information from message payload](https://discourse.nodered.org/t/how-to-separate-information-from-message-payload/9562)

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**Author:** [@mrizkywiguna](https://discourse.nodered.org/u/mrizkywiguna)\
**Replies:** 8\
**Last updated:** [1 April 2019 07:04 UTC](https://discourse.nodered.org/t/how-to-separate-information-from-message-payload/9562 "2019-04-01T07:04:16Z")

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Hi All, Please help me how to filter information from this payload, i just want only read the "Value" from each "ID". \[{"errorCode":"1001","id":"103052.0.184679"},{"id":"103052.0.184677","value":"50.0"},{"id":"103052.0…

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## [How to access node-red remotely?](https://discourse.nodered.org/t/how-to-access-node-red-remotely/9645)

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**Author:** [@alex1](https://discourse.nodered.org/u/alex1)\
**Replies:** 1\
**Last updated:** [1 April 2019 06:49 UTC](https://discourse.nodered.org/t/how-to-access-node-red-remotely/9645 "2019-04-01T06:49:05Z")

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I have my Raspberry Pi with nodered runnning on it at home. How can i access the nodered dashboard when im not at my home? I mean remotely using my smart phone.

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## [Worldmap base map shows then location in settings](https://discourse.nodered.org/t/worldmap-base-map-shows-then-location-in-settings/9616)

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**Author:** [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Replies:** 4\
**Last updated:** [31 March 2019 22:29 UTC](https://discourse.nodered.org/t/worldmap-base-map-shows-then-location-in-settings/9616 "2019-03-31T22:29:25Z")

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node-red-contrib-web-worldmap v1.5.36 In the node's configuration, I've set the latitude and longitude and when I first open the webpage everythnig is fine it shows the correct location. But when I do a refresh in the …

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## [Unhandled rejection Error: EACCES: permission denied,](https://discourse.nodered.org/t/unhandled-rejection-error-eacces-permission-denied/9559)

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**Author:** [@tramanah](https://discourse.nodered.org/u/tramanah)\
**Replies:** 10\
**Last updated:** [31 March 2019 13:15 UTC](https://discourse.nodered.org/t/unhandled-rejection-error-eacces-permission-denied/9559 "2019-03-31T13:15:51Z")

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Good day, I did install node-red in new pc and while trying to install new palette, system denied. the error message are as follows: - 2019-03-29T00:15:07.780Z Install : node-red-contrib-mqtt-broker 0.2.4 2019-03-29T00:…

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## [How to allow 2 different nodered server which are connected to 2 different wifi router](https://discourse.nodered.org/t/how-to-allow-2-different-nodered-server-which-are-connected-to-2-different-wifi-router/9633)

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**Author:** [@alex1](https://discourse.nodered.org/u/alex1)\
**Replies:** 3\
**Last updated:** [31 March 2019 12:47 UTC](https://discourse.nodered.org/t/how-to-allow-2-different-nodered-server-which-are-connected-to-2-different-wifi-router/9633 "2019-03-31T12:47:50Z")

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Are there any solutions or ways to allow two Node-RED servers which are connected to two different WIFI router to communicate with one another? like for example, I have one for house A and another one for house B. How ca…

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## [How to use opencv node for face recognition](https://discourse.nodered.org/t/how-to-use-opencv-node-for-face-recognition/9621)

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**Author:** [@mani2411](https://discourse.nodered.org/u/mani2411)\
**Replies:** 1\
**Last updated:** [31 March 2019 08:20 UTC](https://discourse.nodered.org/t/how-to-use-opencv-node-for-face-recognition/9621 "2019-03-31T08:20:43Z")

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I am using raspberry pi 3b running on rasbian streach os I installed open cv node now i want it to recognise the faces how can i do it i am new to this but i knw with opencv it is possible...please help

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## [Is there a scheduler/timer that will tell "now" what event will be "next"?](https://discourse.nodered.org/t/is-there-a-scheduler-timer-that-will-tell-now-what-event-will-be-next/9512)

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**Author:** [@hominidae](https://discourse.nodered.org/u/hominidae)\
**Replies:** 10\
**Last updated:** [30 March 2019 22:12 UTC](https://discourse.nodered.org/t/is-there-a-scheduler-timer-that-will-tell-now-what-event-will-be-next/9512 "2019-03-30T22:12:01Z")

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Hi everyone, I've been pulling my hair out on this one....maybe you can help me with some insights... For my project I am looking into using a scheduler/timer for creating daily/weekly events. But I do not want to wai…

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## [Using exec node to graph real time data obtained from python script](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617)

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**Author:** [@climatedeniers](https://discourse.nodered.org/u/climatedeniers)\
**Replies:** 3\
**Last updated:** [30 March 2019 20:44 UTC](https://discourse.nodered.org/t/using-exec-node-to-graph-real-time-data-obtained-from-python-script/9617 "2019-03-30T20:44:19Z")

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I have been attempting to graph data obtained from a python script using Node-RED. Whenever I attempt to deploy the nodes and inject the timestamp, I lose connection with Node-RED. Below is the python code: import RPi.…

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## [File inject node installation](https://discourse.nodered.org/t/file-inject-node-installation/9618)

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**Author:** [@mani2411](https://discourse.nodered.org/u/mani2411)\
**Replies:** 3\
**Last updated:** [30 March 2019 19:26 UTC](https://discourse.nodered.org/t/file-inject-node-installation/9618 "2019-03-30T19:26:09Z")

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i folled this command to install file inject node but its not installed acan anyone help?

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## [Changing the topic](https://discourse.nodered.org/t/changing-the-topic/9610)

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**Author:** [@duncan-a](https://discourse.nodered.org/u/duncan-a)\
**Replies:** 3\
**Last updated:** [30 March 2019 14:55 UTC](https://discourse.nodered.org/t/changing-the-topic/9610 "2019-03-30T14:55:42Z")

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I have an incoming MQTT message with msg.topic of "HA/Presence" and a msg.payload that varies depending on where it originated, so let's say it's "test". I need to.create a msg.topic for the acknowledgement MQTT node of…

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## [Node-Red & MySql connection failed ( authentication protocol )](https://discourse.nodered.org/t/node-red-mysql-connection-failed-authentication-protocol/9603)

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**Author:** [@BartosIstvan](https://discourse.nodered.org/u/BartosIstvan)\
**Replies:** 5\
**Last updated:** [30 March 2019 11:23 UTC](https://discourse.nodered.org/t/node-red-mysql-connection-failed-authentication-protocol/9603 "2019-03-30T11:23:18Z")

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Hi everyone! At first, I have a Simatic IOT2040 on which is running the Node-Red server. I want to make a MySql connection with my localhost server from my PC. To be able to access my external database, I have created a …

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## [Obtaining a seated value from a JSON array on a localhost website](https://discourse.nodered.org/t/obtaining-a-seated-value-from-a-json-array-on-a-localhost-website/9576)

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**Author:** [@GChapo](https://discourse.nodered.org/u/GChapo)\
**Replies:** 3\
**Last updated:** [30 March 2019 11:06 UTC](https://discourse.nodered.org/t/obtaining-a-seated-value-from-a-json-array-on-a-localhost-website/9576 "2019-03-30T11:06:25Z")

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I have set up a localhost website on a windows 10 computer and I wish to serve the JSON array to an HTTP node in node red. Whilst I can access the ip address index file from the HTTP node okay I am unsure how I drill do…

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## [Mqtt-in repeated messages bug?](https://discourse.nodered.org/t/mqtt-in-repeated-messages-bug/9520)

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**Author:** [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Replies:** 16\
**Last updated:** [30 March 2019 10:44 UTC](https://discourse.nodered.org/t/mqtt-in-repeated-messages-bug/9520 "2019-03-30T10:44:14Z")

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I see some weird behaviour with the mqtt-in node. When I change the output to "a parsed JSON object" \> deploy. inject something in mqtt-out node, i get a single response. Change the output to "auto-detect" \> deploy. in…

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## [Using AMPL with Node red](https://discourse.nodered.org/t/using-ampl-with-node-red/9602)

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**Author:** [@nassima100](https://discourse.nodered.org/u/nassima100)\
**Replies:** 8\
**Last updated:** [30 March 2019 10:16 UTC](https://discourse.nodered.org/t/using-ampl-with-node-red/9602 "2019-03-30T10:16:05Z")

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Hello, it might be an unusual question but here it is: I'm working on a smart irrigation system with NodeMCU and Node red using MQTT protocol, and I'm using dht22 and soil moisture sensors to collect data evey 30 s. No…

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## [AWS EBS settings.js missing](https://discourse.nodered.org/t/aws-ebs-settings-js-missing/9579)

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**Author:** [@mlabman](https://discourse.nodered.org/u/mlabman)\
**Replies:** 3\
**Last updated:** [30 March 2019 09:07 UTC](https://discourse.nodered.org/t/aws-ebs-settings-js-missing/9579 "2019-03-30T09:07:49Z")

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Following the instructions to get started with an EBS on AWS, per this page: https://nodered.org/docs/platforms/aws And I found a bad link, for the example settings.js - https://github.com/node-red/node-red/blob/master…

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## [Node-Red will not connect to URL on Raspberry Pi](https://discourse.nodered.org/t/node-red-will-not-connect-to-url-on-raspberry-pi/9589)

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**Author:** [@climatedeniers](https://discourse.nodered.org/u/climatedeniers)\
**Replies:** 3\
**Last updated:** [30 March 2019 07:36 UTC](https://discourse.nodered.org/t/node-red-will-not-connect-to-url-on-raspberry-pi/9589 "2019-03-30T07:36:37Z")

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After configuring a flow and deploying it, I cannot access the URL provided in the Node-RED console terminal anymore. I am attempting to display thermocouple temperatures with an Adafruit MAX31855 K-type thermocouple bre…

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## [Unable to install Chatbot from Hassio add-on](https://discourse.nodered.org/t/unable-to-install-chatbot-from-hassio-add-on/9581)

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**Author:** [@jbautomaion](https://discourse.nodered.org/u/jbautomaion)\
**Replies:** 6\
**Last updated:** [30 March 2019 06:59 UTC](https://discourse.nodered.org/t/unable-to-install-chatbot-from-hassio-add-on/9581 "2019-03-30T06:59:09Z")

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I started to install the chatbot module about a month ago and ran into issues. I posted this log over on the Home Assistance forums thinking that it might be something wrong or missing with the HomeAssistant add-on, but…

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## [Unable to edit function part of function node](https://discourse.nodered.org/t/unable-to-edit-function-part-of-function-node/9593)

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**Author:** [@Raj](https://discourse.nodered.org/u/Raj)\
**Replies:** 6\
**Last updated:** [30 March 2019 00:19 UTC](https://discourse.nodered.org/t/unable-to-edit-function-part-of-function-node/9593 "2019-03-30T00:19:04Z")

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Hi, have a couple of issue on Node Red V0.20.3, nodejs V10.15.0, on a Raspberry Pi 3 B. I remove the previous version, with a command like sudo apt-get remove nodered, then removed a couple of directories, cant find the…

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## [Problem with reduce and jsonata](https://discourse.nodered.org/t/problem-with-reduce-and-jsonata/9541)

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**Author:** [@ElGranLoky](https://discourse.nodered.org/u/ElGranLoky)\
**Replies:** 10\
**Last updated:** [29 March 2019 21:22 UTC](https://discourse.nodered.org/t/problem-with-reduce-and-jsonata/9541 "2019-03-29T21:22:29Z")

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I have this flow to get values from a postgres database, and do a reduce, i get a "Invalid JSONata expression: Argument 1 of function "reduce" does not match function signature" \[{"id":"61cc9c87.55a894","type":"tab",…

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## [Servo's on Node-Red](https://discourse.nodered.org/t/servos-on-node-red/5795)

<div class="topic-metadata">

**Author:** [@IvarMvl](https://discourse.nodered.org/u/IvarMvl)\
**Replies:** 8\
**Last updated:** [29 March 2019 13:57 UTC](https://discourse.nodered.org/t/servos-on-node-red/5795 "2019-03-29T13:57:30Z")

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is it possible to controll a servo with Node-Red if yes please show me how

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