# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=240

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

**Page:** 241

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## [Do Node-red MQTT nodes and CLI mosquitto\_pub interfere with each other?](https://discourse.nodered.org/t/do-node-red-mqtt-nodes-and-cli-mosquitto-pub-interfere-with-each-other/75837)

<div class="topic-metadata">

**Author:** [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Replies:** 5\
**Last updated:** [1 March 2023 09:20 UTC](https://discourse.nodered.org/t/do-node-red-mqtt-nodes-and-cli-mosquitto-pub-interfere-with-each-other/75837 "2023-03-01T09:20:36Z")

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I'm using Node-red MQTT nodes on two Raspberry Pies as well as publishing at intervals with mosquitto\_pub in a shell script. I keep seeing status Disconnected in Node-red and I suspect that when the command line connect…

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## [Npm install not working for only this node](https://discourse.nodered.org/t/npm-install-not-working-for-only-this-node/75824)

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**Author:** [@Giacomo23](https://discourse.nodered.org/u/Giacomo23)\
**Replies:** 14\
**Last updated:** [1 March 2023 08:39 UTC](https://discourse.nodered.org/t/npm-install-not-working-for-only-this-node/75824 "2023-03-01T08:39:37Z")

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i'm try install cast for node red using this comand: npm install node-red-contrib-cast but i have this error: npm WARN deprecated querystring@0.2.1: The querystring API is considered Legacy. new code sh …

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## [Aedes MQTT and Clients' IP address](https://discourse.nodered.org/t/aedes-mqtt-and-clients-ip-address/75902)

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**Author:** [@calixtoemilio](https://discourse.nodered.org/u/calixtoemilio)\
**Replies:** 2\
**Last updated:** [1 March 2023 08:20 UTC](https://discourse.nodered.org/t/aedes-mqtt-and-clients-ip-address/75902 "2023-03-01T08:20:50Z")

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status message from the node/clients would not show clients' IP addresses Is there anyway to see that?

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## [Auto on - time limited switch](https://discourse.nodered.org/t/auto-on-time-limited-switch/75873)

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**Author:** [@bluescreentt](https://discourse.nodered.org/u/bluescreentt)\
**Replies:** 4\
**Last updated:** [1 March 2023 06:17 UTC](https://discourse.nodered.org/t/auto-on-time-limited-switch/75873 "2023-03-01T06:17:43Z")

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Hi not sure i'm in the right forum but ill try i am trying to automate a ventilation motor on the roof. i want it to be auto on. between 06:00 and 22:00 in this period i want to be able to turn it off for X time and…

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## [Get URL information in flow](https://discourse.nodered.org/t/get-url-information-in-flow/75909)

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**Author:** [@arminder.lubana](https://discourse.nodered.org/u/arminder.lubana)\
**Replies:** 0\
**Last updated:** [1 March 2023 04:56 UTC](https://discourse.nodered.org/t/get-url-information-in-flow/75909 "2023-03-01T04:56:45Z")

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Hi, Suppose we have configured Node Red editor as https://abc.com (just example) and i want to access this url(https://abc.com) in my flows. How i can get this information without hard coding the URL ? Thanks Arminder…

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## [Oauth2 Node error](https://discourse.nodered.org/t/oauth2-node-error/75898)

<div class="topic-metadata">

**Author:** [@Byteman](https://discourse.nodered.org/u/Byteman)\
**Replies:** 2\
**Last updated:** [28 February 2023 23:43 UTC](https://discourse.nodered.org/t/oauth2-node-error/75898 "2023-02-28T23:43:52Z")

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Hello, I am trying to use Node-Red-contrib-oauth2 following their example. I imported their example nodes and I am running the second flow. I changed all the parameters accordingly as per instructions in d…

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## [No frame when I debug socketcan out](https://discourse.nodered.org/t/no-frame-when-i-debug-socketcan-out/75867)

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**Author:** [@David321](https://discourse.nodered.org/u/David321)\
**Replies:** 1\
**Last updated:** [28 February 2023 23:05 UTC](https://discourse.nodered.org/t/no-frame-when-i-debug-socketcan-out/75867 "2023-02-28T23:05:19Z")

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Hello, I'm working on a project that uses the socketcan out, to visualize frames coming from a BMS (Battery Management System). So far when I debugged the socketcan out I was able to see the frames, but due to a problem…

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## [SNMP v3 node-red-node-snmp](https://discourse.nodered.org/t/snmp-v3-node-red-node-snmp/17639)

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**Author:** [@johnsteeleFarm](https://discourse.nodered.org/u/johnsteeleFarm)\
**Replies:** 31\
**Last updated:** [28 February 2023 23:02 UTC](https://discourse.nodered.org/t/snmp-v3-node-red-node-snmp/17639 "2023-02-28T23:02:45Z")

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Hi, I am currently using node-red-node-snmp at work but have been told that to meet new security requirements I will need to upgrade to SNMP v3. Is this something that would be possible and would there be anyone willing …

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## [I2C communication Raspberry with Waveshare Triac HAT - not working with node-red-contribute-i2c (i2c out)](https://discourse.nodered.org/t/i2c-communication-raspberry-with-waveshare-triac-hat-not-working-with-node-red-contribute-i2c-i2c-out/75887)

<div class="topic-metadata">

**Author:** [@Piet31](https://discourse.nodered.org/u/Piet31)\
**Replies:** 0\
**Last updated:** [28 February 2023 19:31 UTC](https://discourse.nodered.org/t/i2c-communication-raspberry-with-waveshare-triac-hat-not-working-with-node-red-contribute-i2c-i2c-out/75887 "2023-02-28T19:31:34Z")

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Hi, I have connected a Wavshare Triac HAT to my RPi4 with which I want to communicate by I2C to control an AC pump. With i2cdetect -y 1 I can see the Triac HAT at address 0x47 (71dec). The documentation (https://www.wa…

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## [Advice needed: Using a timestamp to send a filename result to an email flow](https://discourse.nodered.org/t/advice-needed-using-a-timestamp-to-send-a-filename-result-to-an-email-flow/74879)

<div class="topic-metadata">

**Author:** [@phpurdon](https://discourse.nodered.org/u/phpurdon)\
**Replies:** 10\
**Last updated:** [28 February 2023 18:26 UTC](https://discourse.nodered.org/t/advice-needed-using-a-timestamp-to-send-a-filename-result-to-an-email-flow/74879 "2023-02-28T18:26:14Z")

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Folks, need some advice on logic please. I am working on a flow to email a filename once daily. A inject with a time recurrence is my trigger: msg.payload The source is the filename being written to (appending data in…

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## [Problem parsing flow variables to write to influx DB](https://discourse.nodered.org/t/problem-parsing-flow-variables-to-write-to-influx-db/75697)

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**Author:** [@NewToNodeRed](https://discourse.nodered.org/u/NewToNodeRed)\
**Replies:** 7\
**Last updated:** [28 February 2023 18:12 UTC](https://discourse.nodered.org/t/problem-parsing-flow-variables-to-write-to-influx-db/75697 "2023-02-28T18:12:45Z")

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Hello All, As my name implies I am new to coding with Node Red and am trying to use it to track high and low temps from my home weather station. I want to write the data to the InfluxDB measurement (table) one per day s…

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## [Node-red-contrib-oled sh1106 fuzzy image (just random pixels)](https://discourse.nodered.org/t/node-red-contrib-oled-sh1106-fuzzy-image-just-random-pixels/74080)

<div class="topic-metadata">

**Author:** [@Yusuf](https://discourse.nodered.org/u/Yusuf)\
**Replies:** 8\
**Last updated:** [28 February 2023 17:44 UTC](https://discourse.nodered.org/t/node-red-contrib-oled-sh1106-fuzzy-image-just-random-pixels/74080 "2023-02-28T17:44:39Z")

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Hi, I have installed the node-red-contrib-oled and tried to show something on sh1106 type oled screen but i see just random pixels. When i run the display by a phyton code like luma.oled webpage (Python usage — Luma.OLE…

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## [Crashing Node Red - OPC UA Client Error](https://discourse.nodered.org/t/crashing-node-red-opc-ua-client-error/73820)

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**Author:** [@matteovi](https://discourse.nodered.org/u/matteovi)\
**Replies:** 1\
**Last updated:** [28 February 2023 16:52 UTC](https://discourse.nodered.org/t/crashing-node-red-opc-ua-client-error/73820 "2023-02-28T16:52:44Z")

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Hi, I have an error with opc ua conncection. My Node-Red crash with this Error "Cannot read properties of undefined (readinf 'callback'). I'll attach a screen of the problem. How Can i Fix that?

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## [Node RED on Pico - why is it not working?](https://discourse.nodered.org/t/node-red-on-pico-why-is-it-not-working/74092)

<div class="topic-metadata">

**Author:** [@beg1nner](https://discourse.nodered.org/u/beg1nner)\
**Replies:** 8\
**Last updated:** [28 February 2023 16:46 UTC](https://discourse.nodered.org/t/node-red-on-pico-why-is-it-not-working/74092 "2023-02-28T16:46:57Z")

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Hi there, I'd like to know why my project isn't working. On my Raspberry Pi (4B) I've created a WIFI-accesspoint with RaspAP. My Pi should also work as a Node-RED-broker. After that I've connected a Raspberry Pi Pico …

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## [Node Red crashed](https://discourse.nodered.org/t/node-red-crashed/75840)

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**Author:** [@ChrisF](https://discourse.nodered.org/u/ChrisF)\
**Replies:** 8\
**Last updated:** [28 February 2023 16:32 UTC](https://discourse.nodered.org/t/node-red-crashed/75840 "2023-02-28T16:32:10Z")

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Hello all, a small or big problem. I have installed a package under NodeRed. After that the porgram is crashed and is no longer reachable under the IP:1880. Also the dashboard is not. Is it still possible to save the …

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## [HTTP endpoint creation problem](https://discourse.nodered.org/t/http-endpoint-creation-problem/75875)

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**Author:** [@Acii](https://discourse.nodered.org/u/Acii)\
**Replies:** 6\
**Last updated:** [28 February 2023 15:45 UTC](https://discourse.nodered.org/t/http-endpoint-creation-problem/75875 "2023-02-28T15:45:24Z")

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Hello everyone, I explain the context, it is very simple to understand, I have a flow that compares two numerical variables, these values come from an HTTP request. Depending on the values of the two numeric variable…

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## [Simple counter with python context.get('count')](https://discourse.nodered.org/t/simple-counter-with-python-context-get-count/75709)

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**Author:** [@superlogan72](https://discourse.nodered.org/u/superlogan72)\
**Replies:** 11\
**Last updated:** [28 February 2023 14:58 UTC](https://discourse.nodered.org/t/simple-counter-with-python-context-get-count/75709 "2023-02-28T14:58:57Z")

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I have seen one example of of simple counter in js var count=context.get('count') there is similar function that i can use in python with node red

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## [ELOGIN; MSSQL Login failed](https://discourse.nodered.org/t/elogin-mssql-login-failed/75862)

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**Author:** [@Markus712712](https://discourse.nodered.org/u/Markus712712)\
**Replies:** 6\
**Last updated:** [28 February 2023 12:21 UTC](https://discourse.nodered.org/t/elogin-mssql-login-failed/75862 "2023-02-28T12:21:12Z")

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Hi, I am using NodeRed verion v3.0.2 and Node.js version v18.14.2. I want to connect NodeRed with my MSSQL (2019) DB but get the "login failed for user" error everytime. I tried everything (other users/passwords/reinst…

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## [Function node - Calculate and filter messages](https://discourse.nodered.org/t/function-node-calculate-and-filter-messages/75288)

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**Author:** [@niehans](https://discourse.nodered.org/u/niehans)\
**Replies:** 6\
**Last updated:** [28 February 2023 10:26 UTC](https://discourse.nodered.org/t/function-node-calculate-and-filter-messages/75288 "2023-02-28T10:26:01Z")

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I have this input \[{"id":"0ffff120ea2c2c27","type":"inject","z":"f6f2187d.f17ca8","name":"","props":\[{"p":"payload"}\],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\\"AI1-lux\\":962,\\"AI2…

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## [Buffer parser to reverse](https://discourse.nodered.org/t/buffer-parser-to-reverse/75860)

<div class="topic-metadata">

**Author:** [@Kursat](https://discourse.nodered.org/u/Kursat)\
**Replies:** 4\
**Last updated:** [28 February 2023 08:00 UTC](https://discourse.nodered.org/t/buffer-parser-to-reverse/75860 "2023-02-28T08:00:44Z")

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I converted the data that came with the buffer parser node to string, but it was reversed in binary, how can I fix this?

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## [MQTT data logs in SQL server always shifting](https://discourse.nodered.org/t/mqtt-data-logs-in-sql-server-always-shifting/75851)

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**Author:** [@SIW](https://discourse.nodered.org/u/SIW)\
**Replies:** 2\
**Last updated:** [28 February 2023 07:16 UTC](https://discourse.nodered.org/t/mqtt-data-logs-in-sql-server-always-shifting/75851 "2023-02-28T07:16:25Z")

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I am using Node-Red to log MQTT data in SQL server. It works fine for a few minutes and it won't write on to proper columns. Appreciate it if anyone helps me to fix this issue. Following is a sample log, Here is my …

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## [Trigger output of second subflow instance when input on first](https://discourse.nodered.org/t/trigger-output-of-second-subflow-instance-when-input-on-first/75155)

<div class="topic-metadata">

**Author:** [@jo3ran](https://discourse.nodered.org/u/jo3ran)\
**Replies:** 8\
**Last updated:** [28 February 2023 06:59 UTC](https://discourse.nodered.org/t/trigger-output-of-second-subflow-instance-when-input-on-first/75155 "2023-02-28T06:59:34Z")

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Dear knights of Node-RED, since I'm new to this Forum: Hi, my name is Jöran and I'm using NR mainly for added functionality of my KNX setup but also to integrate other somewhat smart devices like Fritz, Sonos, ... Here…

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## [Firebase Credentials error](https://discourse.nodered.org/t/firebase-credentials-error/75588)

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**Author:** [@Maruthi](https://discourse.nodered.org/u/Maruthi)\
**Replies:** 6\
**Last updated:** [28 February 2023 06:25 UTC](https://discourse.nodered.org/t/firebase-credentials-error/75588 "2023-02-28T06:25:43Z")

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I'm using the below mentioned firebase node node-red-firebase 0.1.0 Getting credentials null error, not getting where to assign the credentials, only these two fields are available at the node setting Only these 3 n…

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## [Modbus write/read collisions](https://discourse.nodered.org/t/modbus-write-read-collisions/74962)

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**Author:** [@rxdeath](https://discourse.nodered.org/u/rxdeath)\
**Replies:** 9\
**Last updated:** [27 February 2023 22:43 UTC](https://discourse.nodered.org/t/modbus-write-read-collisions/74962 "2023-02-27T22:43:50Z")

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i'm using rs485 modbus on a project, i have around 6 flex getter nodes, and 2 flex write nodes on different flows. what i notice is when i have a flex read interval of 1 second, the write node is stuck in queuing mode a…

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## [Switch forwarding on or off](https://discourse.nodered.org/t/switch-forwarding-on-or-off/75831)

<div class="topic-metadata">

**Author:** [@ChrisF](https://discourse.nodered.org/u/ChrisF)\
**Replies:** 2\
**Last updated:** [27 February 2023 20:37 UTC](https://discourse.nodered.org/t/switch-forwarding-on-or-off/75831 "2023-02-27T20:37:04Z")

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Hello, I have a humidity sensor that triggers and passes on an Actions at your certain value. I would like to put a switch in between and switch the forwarding on or off. So whether the function is enabled or disabled. …

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## [Npm install node-red-contrib-fs-ops not installed](https://discourse.nodered.org/t/npm-install-node-red-contrib-fs-ops-not-installed/75808)

<div class="topic-metadata">

**Author:** [@Giacomo23](https://discourse.nodered.org/u/Giacomo23)\
**Replies:** 21\
**Last updated:** [27 February 2023 20:31 UTC](https://discourse.nodered.org/t/npm-install-node-red-contrib-fs-ops-not-installed/75808 "2023-02-27T20:31:13Z")

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hi all, I'm trying to install a node using the npm command from the terminal, using the following command "npm install node-red-contrib-fs-ops". The command doesn't give me any problems but when I go to look for the …

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## [RequestError: Invalid object name](https://discourse.nodered.org/t/requesterror-invalid-object-name/75556)

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**Author:** [@sgoics](https://discourse.nodered.org/u/sgoics)\
**Replies:** 4\
**Last updated:** [27 February 2023 18:40 UTC](https://discourse.nodered.org/t/requesterror-invalid-object-name/75556 "2023-02-27T18:40:52Z")

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Hi. New to node-red. It's been working great to monitor MSS tables that are updated on a schedule. But working with this specific Database is giving me issues. The error is "RequestError: Invalid object name 'WASP.dbo.W…

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## [Return only Ids that have not been checked](https://discourse.nodered.org/t/return-only-ids-that-have-not-been-checked/75713)

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**Author:** [@sgoics](https://discourse.nodered.org/u/sgoics)\
**Replies:** 4\
**Last updated:** [27 February 2023 18:29 UTC](https://discourse.nodered.org/t/return-only-ids-that-have-not-been-checked/75713 "2023-02-27T18:29:41Z")

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Hi again! I have a flow that when ran, checks for a certain string from a table via mssql, then spits the alert out in the form of an email. That all works fine. However, I don't want it to keep sending out the same one…

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## [Move Data Based on Time](https://discourse.nodered.org/t/move-data-based-on-time/75817)

<div class="topic-metadata">

**Author:** [@Kimber](https://discourse.nodered.org/u/Kimber)\
**Replies:** 8\
**Last updated:** [27 February 2023 17:57 UTC](https://discourse.nodered.org/t/move-data-based-on-time/75817 "2023-02-27T17:57:46Z")

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I'm new to the sofware, so patience please.... I have some data moving from an EthIP In node to a InfluxDB node. Currently, this is happening every scan of the PC. I want to set it up so it will move the data on time …

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## [Ui Builder Script to get output](https://discourse.nodered.org/t/ui-builder-script-to-get-output/75407)

<div class="topic-metadata">

**Author:** [@Worscht](https://discourse.nodered.org/u/Worscht)\
**Replies:** 27\
**Last updated:** [27 February 2023 16:54 UTC](https://discourse.nodered.org/t/ui-builder-script-to-get-output/75407 "2023-02-27T16:54:47Z")

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Hello, today i tryed the Ui builder and i have some nice Buttons that i tryed to use. The Frontend works great but can someone help me how i send something to node red when i push a Button and how i can switch a Button…

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