# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=546

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**Page:** 547

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## [Can I connect 8 MAX31865 to raspberry Pi using Node-RED?](https://discourse.nodered.org/t/can-i-connect-8-max31865-to-raspberry-pi-using-node-red/46463)

<div class="topic-metadata">

**Author:** [@dhia333](https://discourse.nodered.org/u/dhia333)\
**Replies:** 3\
**Last updated:** [30 May 2021 17:00 UTC](https://discourse.nodered.org/t/can-i-connect-8-max31865-to-raspberry-pi-using-node-red/46463 "2021-05-30T17:00:20Z")

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Hi I'm new to raspberry Pi and node-RED and I need to connect 8 Pt 100 sensors to Raspberry Pi using 8 MAX 31865 chips (with SPI protocol) and MAX 31865 node. Does this node let you use 8 GPIO pins to select one chip at …

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## [Filtering Keys from an object](https://discourse.nodered.org/t/filtering-keys-from-an-object/46381)

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**Author:** [@ajaymccollum](https://discourse.nodered.org/u/ajaymccollum)\
**Replies:** 2\
**Last updated:** [30 May 2021 16:25 UTC](https://discourse.nodered.org/t/filtering-keys-from-an-object/46381 "2021-05-30T16:25:48Z")

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My apologies if I have a bit of the lingo wrong; I'll do my best....I'd like to filter out keys and their values based on certain letters within the key. The specific purpose of this is using the Binance node someone mad…

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## [Linux vs. Windows injecting buffer values](https://discourse.nodered.org/t/linux-vs-windows-injecting-buffer-values/46352)

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**Author:** [@tree-frog](https://discourse.nodered.org/u/tree-frog)\
**Replies:** 23\
**Last updated:** [29 May 2021 20:23 UTC](https://discourse.nodered.org/t/linux-vs-windows-injecting-buffer-values/46352 "2021-05-29T20:23:21Z")

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injecting buffer values gives syntax error in Windows 10. If I use my Linux system at home, I can inject a buffer buffer: \[02,45,45,03\] Windows gives me "SyntaxError: Unexpected number in JSON at position 1" I tried …

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## [ThingsBoard MQTT Sensor data](https://discourse.nodered.org/t/thingsboard-mqtt-sensor-data/46361)

<div class="topic-metadata">

**Author:** [@Martin10](https://discourse.nodered.org/u/Martin10)\
**Replies:** 11\
**Last updated:** [29 May 2021 17:38 UTC](https://discourse.nodered.org/t/thingsboard-mqtt-sensor-data/46361 "2021-05-29T17:38:57Z")

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Hi, i try to upload sensor data from NR to ThingsBoard via MQTT, but i can't connect. I use mqtt node and use this set ups, but can't upload any data. Can someone help me?

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## [Repeated message even without anyone publish it](https://discourse.nodered.org/t/repeated-message-even-without-anyone-publish-it/46451)

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**Author:** [@kristfrizh](https://discourse.nodered.org/u/kristfrizh)\
**Replies:** 7\
**Last updated:** [29 May 2021 17:23 UTC](https://discourse.nodered.org/t/repeated-message-even-without-anyone-publish-it/46451 "2021-05-29T17:23:33Z")

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Hello, i'm new with this node-red things and need some guidance regarding my problem. I'm using google VM as my server with mosquitto and esp32 as publisher and subscriber. right now, i start using 2 esp32 to communica…

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## [&& and || can not be combined?](https://discourse.nodered.org/t/and-can-not-be-combined/46425)

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**Author:** [@edstobi](https://discourse.nodered.org/u/edstobi)\
**Replies:** 6\
**Last updated:** [29 May 2021 13:55 UTC](https://discourse.nodered.org/t/and-can-not-be-combined/46425 "2021-05-29T13:55:28Z")

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HI and sorry I need again help to figure out a maybe syntax problem if( a=="1" || b=="10" || c=="100"){ ......... working, :grinning: if( (a=="1" || b=="10" || c=="100") && d \>1000){ ........is not working. do I…

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## [Unable to manage palette (install new nodes)](https://discourse.nodered.org/t/unable-to-manage-palette-install-new-nodes/46434)

<div class="topic-metadata">

**Author:** [@Cyprus125](https://discourse.nodered.org/u/Cyprus125)\
**Replies:** 8\
**Last updated:** [29 May 2021 12:44 UTC](https://discourse.nodered.org/t/unable-to-manage-palette-install-new-nodes/46434 "2021-05-29T12:44:07Z")

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hello, so i had a sd card finally die(long story) so i went and did a reinstall of everything. in ver 1.3.5 they apear to have removed the ability to install nodes in the web gui. anyone know a non command line altern…

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## [Get zwavejs2mqtt parameters](https://discourse.nodered.org/t/get-zwavejs2mqtt-parameters/46444)

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**Author:** [@stu1811](https://discourse.nodered.org/u/stu1811)\
**Replies:** 0\
**Last updated:** [29 May 2021 11:28 UTC](https://discourse.nodered.org/t/get-zwavejs2mqtt-parameters/46444 "2021-05-29T11:28:22Z")

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At runtime how can I retrieve parameters of a zwave node? I know I can set them with bulk\_set\_partial\_config\_parameters.

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## [HTML tag in HTTP request](https://discourse.nodered.org/t/html-tag-in-http-request/43695)

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**Author:** [@Hunter](https://discourse.nodered.org/u/Hunter)\
**Replies:** 7\
**Last updated:** [29 May 2021 11:23 UTC](https://discourse.nodered.org/t/html-tag-in-http-request/43695 "2021-05-29T11:23:56Z")

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Hello, I'm using an HTTP request node to POST something from NR towards a NChat chatbox (SMF forum) which can contain HTML tags, such as: index.php?message=This is \<b\>my\</b\> message. But it gets encoded into "This is &l…

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## [Reading the SPI bus with Node Red](https://discourse.nodered.org/t/reading-the-spi-bus-with-node-red/44339)

<div class="topic-metadata">

**Author:** [@Keith](https://discourse.nodered.org/u/Keith)\
**Replies:** 5\
**Last updated:** [29 May 2021 11:17 UTC](https://discourse.nodered.org/t/reading-the-spi-bus-with-node-red/44339 "2021-05-29T11:17:40Z")

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Hello, I'm wondering if anyone has been able to read the SPI bus with node red. I am trying to read the output of a MAX6675 which is a thermocouple digitiser with 12 bit resolution. The only possible method that I can th…

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## [Using payload from Modbus Flex Getter to query mySQL database on phpmyadmin](https://discourse.nodered.org/t/using-payload-from-modbus-flex-getter-to-query-mysql-database-on-phpmyadmin/46412)

<div class="topic-metadata">

**Author:** [@a\_rakshith](https://discourse.nodered.org/u/a_rakshith)\
**Replies:** 13\
**Last updated:** [29 May 2021 11:04 UTC](https://discourse.nodered.org/t/using-payload-from-modbus-flex-getter-to-query-mysql-database-on-phpmyadmin/46412 "2021-05-29T11:04:51Z")

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I am trying to use the payload coming in from a PLC (part number is a combination of numbers and text) through modbus flex getter and use the buffer parser to convert the hex to string. However, using that payload to qu…

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## [Flows stopped due to missing node types. (mqttssl-broker)](https://discourse.nodered.org/t/flows-stopped-due-to-missing-node-types-mqttssl-broker/46437)

<div class="topic-metadata">

**Author:** [@Vincent](https://discourse.nodered.org/u/Vincent)\
**Replies:** 8\
**Last updated:** [29 May 2021 10:20 UTC](https://discourse.nodered.org/t/flows-stopped-due-to-missing-node-types-mqttssl-broker/46437 "2021-05-29T10:20:04Z")

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Hi, can I know the steps in removing the unknown missing node in node-RED. Flows stopped due to missing node types. mqttssl-broker I have tried removing this node from the 'manage palette' \> 'node' but the console w…

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## [Working with an Array in a SubFlow](https://discourse.nodered.org/t/working-with-an-array-in-a-subflow/46383)

<div class="topic-metadata">

**Author:** [@akd02](https://discourse.nodered.org/u/akd02)\
**Replies:** 12\
**Last updated:** [29 May 2021 09:12 UTC](https://discourse.nodered.org/t/working-with-an-array-in-a-subflow/46383 "2021-05-29T09:12:14Z")

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Hello Community, I need help on this one. I want to create a subflow that maintains a “list” in the form of an array of objects. I would like to let the user configure a “uniqueID” being a property such that the list w…

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## [Help using BACnet / node-red-contrib-bacnet](https://discourse.nodered.org/t/help-using-bacnet-node-red-contrib-bacnet/5828)

<div class="topic-metadata">

**Author:** [@accuser](https://discourse.nodered.org/u/accuser)\
**Replies:** 3\
**Last updated:** [29 May 2021 07:52 UTC](https://discourse.nodered.org/t/help-using-bacnet-node-red-contrib-bacnet/5828 "2021-05-29T07:52:13Z")

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I've got a flow monitoring the present value property of humidity, air temperature, and water temperature objects of a mechanical ventilation and heat recovery (MVHR) unit using BACnet Read nodes from node-red-contrib-ba…

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## [BACnet write property](https://discourse.nodered.org/t/bacnet-write-property/12482)

<div class="topic-metadata">

**Author:** [@fordarn](https://discourse.nodered.org/u/fordarn)\
**Replies:** 7\
**Last updated:** [29 May 2021 04:18 UTC](https://discourse.nodered.org/t/bacnet-write-property/12482 "2021-05-29T04:18:26Z")

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Hi All New to Raspberry PI and Node Red. I have been playing all day and trying to integrate a BMS controller and a Pi together for home automation via BACnet (node-red-contrib-bacnet) I have managed to get the read p…

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## [Decode byte Help](https://discourse.nodered.org/t/decode-byte-help/46415)

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**Author:** [@Monzav](https://discourse.nodered.org/u/Monzav)\
**Replies:** 2\
**Last updated:** [28 May 2021 21:31 UTC](https://discourse.nodered.org/t/decode-byte-help/46415 "2021-05-28T21:31:18Z")

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this is what i'm sending through the serial port and I am receiving this Could someone tell me why I receive this?

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## [Unable to listen on port 23](https://discourse.nodered.org/t/unable-to-listen-on-port-23/46420)

<div class="topic-metadata">

**Author:** [@that-jim](https://discourse.nodered.org/u/that-jim)\
**Replies:** 4\
**Last updated:** [28 May 2021 20:48 UTC](https://discourse.nodered.org/t/unable-to-listen-on-port-23/46420 "2021-05-28T20:48:10Z")

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I am setting up node red on a raspberry pi to act as a protocol adaptor. I would like to have node red listen for a connection on port 23. I have a piece of old equipment that wants to connect to the pie using port 23, i…

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## [How to restart Node-red on ubuntu](https://discourse.nodered.org/t/how-to-restart-node-red-on-ubuntu/43465)

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**Author:** [@Anthony](https://discourse.nodered.org/u/Anthony)\
**Replies:** 6\
**Last updated:** [28 May 2021 20:06 UTC](https://discourse.nodered.org/t/how-to-restart-node-red-on-ubuntu/43465 "2021-05-28T20:06:43Z")

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Hi All, I'm following this guide to creating my first custom node. In the guide it states that ' Any changes to the node’s file can be picked up by simply restarting Node-RED' but does not provide any instruction on how…

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## [Anyone made a flow to record an MQTT feed and replay it?](https://discourse.nodered.org/t/anyone-made-a-flow-to-record-an-mqtt-feed-and-replay-it/46413)

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**Author:** [@cymplecy](https://discourse.nodered.org/u/cymplecy)\
**Replies:** 2\
**Last updated:** [28 May 2021 20:03 UTC](https://discourse.nodered.org/t/anyone-made-a-flow-to-record-an-mqtt-feed-and-replay-it/46413 "2021-05-28T20:03:27Z")

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..at the speed the messages came in at? Just checking before I set to writing one :slight\_smile:

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## [MySql parsing error after a day of working](https://discourse.nodered.org/t/mysql-parsing-error-after-a-day-of-working/46360)

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**Author:** [@Apulus](https://discourse.nodered.org/u/Apulus)\
**Replies:** 7\
**Last updated:** [28 May 2021 19:35 UTC](https://discourse.nodered.org/t/mysql-parsing-error-after-a-day-of-working/46360 "2021-05-28T19:35:36Z")

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Dear All after one day of normal behaviour I got this error from Mysql Node. "Error: ER\_PARSE\_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right…

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## [Grafana question about line for all input in DB](https://discourse.nodered.org/t/grafana-question-about-line-for-all-input-in-db/46370)

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**Author:** [@vikozo](https://discourse.nodered.org/u/vikozo)\
**Replies:** 7\
**Last updated:** [28 May 2021 18:50 UTC](https://discourse.nodered.org/t/grafana-question-about-line-for-all-input-in-db/46370 "2021-05-28T18:50:10Z")

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Hello i do send daily aproximatly 10 time information to a influxDB. With Grafana i just would like the hourly input as bar and cumulative line of each input into the database. i just can't find out how to use it - be…

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## [Help with POST request with Venstar API](https://discourse.nodered.org/t/help-with-post-request-with-venstar-api/46347)

<div class="topic-metadata">

**Author:** [@NRdiscrs9393](https://discourse.nodered.org/u/NRdiscrs9393)\
**Replies:** 1\
**Last updated:** [28 May 2021 18:15 UTC](https://discourse.nodered.org/t/help-with-post-request-with-venstar-api/46347 "2021-05-28T18:15:00Z")

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Hello, How may I properly configure the change node to POST to my Venstar thermostat via an http request node? Here is what the Venstar API calls for: request.post({ url:'http://192.168.1.104/control', form:{ mo…

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## [Save debug Node into a file](https://discourse.nodered.org/t/save-debug-node-into-a-file/46299)

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**Author:** [@vikozo](https://discourse.nodered.org/u/vikozo)\
**Replies:** 6\
**Last updated:** [28 May 2021 17:51 UTC](https://discourse.nodered.org/t/save-debug-node-into-a-file/46299 "2021-05-28T17:51:48Z")

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Hello i have a flow and of course some debug node! no the debug information comes not often - most in the night. Is there a way to save the hole debug information into a file? have a nice day vinc

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## [Modbus TCP using Node-Red](https://discourse.nodered.org/t/modbus-tcp-using-node-red/46354)

<div class="topic-metadata">

**Author:** [@dpatel2016](https://discourse.nodered.org/u/dpatel2016)\
**Replies:** 3\
**Last updated:** [28 May 2021 16:00 UTC](https://discourse.nodered.org/t/modbus-tcp-using-node-red/46354 "2021-05-28T16:00:02Z")

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Hi, I have a machine that talks Modbus TCP and I want to communicate to it using node-red on raspberry pi. Is it possible to do what is shown in the picture? The register address is 40001. I have modbus TCP node instal…

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## [Only send a message if I press a button](https://discourse.nodered.org/t/only-send-a-message-if-i-press-a-button/46355)

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**Author:** [@luis](https://discourse.nodered.org/u/luis)\
**Replies:** 15\
**Last updated:** [28 May 2021 15:58 UTC](https://discourse.nodered.org/t/only-send-a-message-if-i-press-a-button/46355 "2021-05-28T15:58:46Z")

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Is there any way I can store a value until I press a button? The problem Im having is that a button is just an input and I dont know how to make It so the value gets stored until I press the button.

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## [Conversation with STONE Panel via Serial Port](https://discourse.nodered.org/t/conversation-with-stone-panel-via-serial-port/46156)

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**Author:** [@DerD74](https://discourse.nodered.org/u/DerD74)\
**Replies:** 11\
**Last updated:** [28 May 2021 15:28 UTC](https://discourse.nodered.org/t/conversation-with-stone-panel-via-serial-port/46156 "2021-05-28T15:28:13Z")

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Dear all, I try to comuicate with STONE Panel via Serial Port. This is working with hex commands as you can read in the screenshot below. I tried out folloiwing with serial nodes. But it does not work and I dont kno…

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## [Pass msg only if another arrive](https://discourse.nodered.org/t/pass-msg-only-if-another-arrive/46402)

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**Author:** [@thalesmaoa](https://discourse.nodered.org/u/thalesmaoa)\
**Replies:** 8\
**Last updated:** [28 May 2021 15:07 UTC](https://discourse.nodered.org/t/pass-msg-only-if-another-arrive/46402 "2021-05-28T15:07:10Z")

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Hi there, I'm having trouble to put my flow to work. I have two messages coming from different sensors. Sometimes, sensor 1 gives a false alarm (can't fix it using hardware). So I decided to only pass the message to the…

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## [Kasa HS-105 - Event in case of power outage?](https://discourse.nodered.org/t/kasa-hs-105-event-in-case-of-power-outage/46373)

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**Author:** [@rakgupta](https://discourse.nodered.org/u/rakgupta)\
**Replies:** 4\
**Last updated:** [28 May 2021 13:33 UTC](https://discourse.nodered.org/t/kasa-hs-105-event-in-case-of-power-outage/46373 "2021-05-28T13:33:35Z")

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Hello - I am using the TP-Link node ( node-red-contrib-tplink) and I can see the power events if I turn the plug on/off from either the app or by sending it the command from Node-RED (inject node). However, I am trying t…

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## [Use Hue Temp and Hue Light to control cover](https://discourse.nodered.org/t/use-hue-temp-and-hue-light-to-control-cover/46399)

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**Author:** [@TurboKanne](https://discourse.nodered.org/u/TurboKanne)\
**Replies:** 3\
**Last updated:** [28 May 2021 11:57 UTC](https://discourse.nodered.org/t/use-hue-temp-and-hue-light-to-control-cover/46399 "2021-05-28T11:57:01Z")

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Hi, a few month ago I started to use Home Assistant with Node Red. I really like it although there are a lot of things that I do not understand or know yet. For my flows so far (such as time based window cover movem…

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## [Message structure convention](https://discourse.nodered.org/t/message-structure-convention/46324)

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**Author:** [@bartoszek](https://discourse.nodered.org/u/bartoszek)\
**Replies:** 8\
**Last updated:** [28 May 2021 10:36 UTC](https://discourse.nodered.org/t/message-structure-convention/46324 "2021-05-28T10:36:31Z")

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Hi! I've got a problem with choosing a "Node-RED" way to "construct" the message passed through nodes. To describe my "problem" I have an array of relays, couple of boards, with 16 relays each, most of them are used t…

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