# General

**URL:** https://discourse.nodered.org/c/general/7.md?page=871

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

**Page:** 872

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## [Subflow problem](https://discourse.nodered.org/t/subflow-problem/12771)

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**Author:** [@iungo](https://discourse.nodered.org/u/iungo)\
**Replies:** 6\
**Last updated:** [1 July 2019 09:44 UTC](https://discourse.nodered.org/t/subflow-problem/12771 "2019-07-01T09:44:38Z")

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I have a problem with i2c ADC in the subflow. If I add a subflow with i2c device in flow, the first time it works fine, but after I remove the subflow and deploy, i2c still works. Further - worse. If I add and remove s…

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## [Archiving and synchronization of data along with time stamp with MQTT broker after failure of internet connection in IOT gateway](https://discourse.nodered.org/t/archiving-and-synchronization-of-data-along-with-time-stamp-with-mqtt-broker-after-failure-of-internet-connection-in-iot-gateway/12770)

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**Author:** [@DJIOT](https://discourse.nodered.org/u/DJIOT)\
**Replies:** 8\
**Last updated:** [1 July 2019 09:25 UTC](https://discourse.nodered.org/t/archiving-and-synchronization-of-data-along-with-time-stamp-with-mqtt-broker-after-failure-of-internet-connection-in-iot-gateway/12770 "2019-07-01T09:25:27Z")

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Dear Team, I have a following requirement for water project. We are getting water pump station data in IOT gateway . We want send this data to MQTT broker which is working fine. But we need to implement functionality …

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## [Interval time calculation](https://discourse.nodered.org/t/interval-time-calculation/12357)

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**Author:** [@Carloj](https://discourse.nodered.org/u/Carloj)\
**Replies:** 10\
**Last updated:** [1 July 2019 08:39 UTC](https://discourse.nodered.org/t/interval-time-calculation/12357 "2019-07-01T08:39:09Z")

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i got the following flow:" \[{"id":"79ce684e.6b6da8","type":"function","z":"1f216cc0.281a93","name":"INSERT statement","func":"msg.topic = \\"INSERT INTO \`IOT\_DATA\` ( \`DATA\_BRON\`,\`DATA\_SOORT\`,\`DATA\_WAARDE\`) VALUES ('77','…

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## [How to modify its default login interface in node-red?](https://discourse.nodered.org/t/how-to-modify-its-default-login-interface-in-node-red/12766)

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**Author:** [@dongyan0527](https://discourse.nodered.org/u/dongyan0527)\
**Replies:** 2\
**Last updated:** [1 July 2019 07:21 UTC](https://discourse.nodered.org/t/how-to-modify-its-default-login-interface-in-node-red/12766 "2019-07-01T07:21:05Z")

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I want to modify it into my own login interface. I don't know where it is.

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## [Raspberry pi and node red email sending](https://discourse.nodered.org/t/raspberry-pi-and-node-red-email-sending/12754)

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**Author:** [@nick223](https://discourse.nodered.org/u/nick223)\
**Replies:** 4\
**Last updated:** [1 July 2019 07:12 UTC](https://discourse.nodered.org/t/raspberry-pi-and-node-red-email-sending/12754 "2019-07-01T07:12:23Z")

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I use a raspberry pi 3 B to monitor a bluehost email address and send the body of the message out to pushover and twitter. I receive the weather email from noaa.gov and my email checks the email on node reads it but it …

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## [Is there any way to automatically authenticate myself in a site with a node?](https://discourse.nodered.org/t/is-there-any-way-to-automatically-authenticate-myself-in-a-site-with-a-node/12703)

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**Author:** [@Doomorelha](https://discourse.nodered.org/u/Doomorelha)\
**Replies:** 5\
**Last updated:** [30 June 2019 18:52 UTC](https://discourse.nodered.org/t/is-there-any-way-to-automatically-authenticate-myself-in-a-site-with-a-node/12703 "2019-06-30T18:52:31Z")

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Hi guys! So, i was doing a robot on nodered who request an http site, then kinda 'look' at the page and retreive some information about the html and send it to my email whenever the html changes (like an update in a mark…

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## [Increment a flow.get](https://discourse.nodered.org/t/increment-a-flow-get/12743)

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**Author:** [@Dave](https://discourse.nodered.org/u/Dave)\
**Replies:** 3\
**Last updated:** [30 June 2019 11:56 UTC](https://discourse.nodered.org/t/increment-a-flow-get/12743 "2019-06-30T11:56:27Z")

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I have had a strange issue, which I don't understand, I have the following in a function node flow.set('count',flow.get('count')+1); normally it works fine like flow.set('count') = 1 then 2 then 3 etc however for some …

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## [Dont show node red interface in web browser](https://discourse.nodered.org/t/dont-show-node-red-interface-in-web-browser/12731)

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**Author:** [@Victor-t](https://discourse.nodered.org/u/Victor-t)\
**Replies:** 1\
**Last updated:** [30 June 2019 03:38 UTC](https://discourse.nodered.org/t/dont-show-node-red-interface-in-web-browser/12731 "2019-06-30T03:38:08Z")

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I have used node-red in a "raspberry pi" before and it works ok. Now i want to use it in a ubuntu 18.04 OS. I have followed the tutorials in internet, but when i try access through web browser, this cant connect. Someon…

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## [JS: Pushing a new object into nested array-objects](https://discourse.nodered.org/t/js-pushing-a-new-object-into-nested-array-objects/12719)

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**Author:** [@IoTPlay](https://discourse.nodered.org/u/IoTPlay)\
**Replies:** 3\
**Last updated:** [29 June 2019 22:05 UTC](https://discourse.nodered.org/t/js-pushing-a-new-object-into-nested-array-objects/12719 "2019-06-29T22:05:12Z")

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I realise my problem is about understanding JS objects and arrays, I thus published this request in stackoverflow, but either I did not explain my problem correctly, or people do not understand why I need to have nested …

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## [Issues with homekit module after node-red update](https://discourse.nodered.org/t/issues-with-homekit-module-after-node-red-update/12716)

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**Author:** [@kkkjay](https://discourse.nodered.org/u/kkkjay)\
**Replies:** 5\
**Last updated:** [29 June 2019 20:50 UTC](https://discourse.nodered.org/t/issues-with-homekit-module-after-node-red-update/12716 "2019-06-29T20:50:28Z")

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Hi Everybody, I have a problem with homekit module - accessories are "not responding" after a random time. The same happens after each restart of node-red. The reason I am writing this here is that my problems started …

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## [Time frame based report-by-exception (RBE)?](https://discourse.nodered.org/t/time-frame-based-report-by-exception-rbe/12718)

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**Author:** [@nodecentral](https://discourse.nodered.org/u/nodecentral)\
**Replies:** 9\
**Last updated:** [29 June 2019 20:09 UTC](https://discourse.nodered.org/t/time-frame-based-report-by-exception-rbe/12718 "2019-06-29T20:09:08Z")

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Hi I’m using RBE with my Harmony Remote (HWS Observe) node as multiples of the same command are captured when an Activity is kicked off on the remote. As that repeating payload only lasts for a short period, e.g 2 sec…

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## [Ui\_control strange situation](https://discourse.nodered.org/t/ui-control-strange-situation/11884)

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**Author:** [@markost](https://discourse.nodered.org/u/markost)\
**Replies:** 13\
**Last updated:** [29 June 2019 17:05 UTC](https://discourse.nodered.org/t/ui-control-strange-situation/11884 "2019-06-29T17:05:02Z")

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Hi, I'm trying to use ui\_node to switch tabs. From "tab B" to "tab A" goes well, while from "tab A" does not work as expected. When I want to switch from "tab A" to "tab B", I have to click on the created button(doubl…

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## [Detect if somebody is taking a shower](https://discourse.nodered.org/t/detect-if-somebody-is-taking-a-shower/12125)

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**Author:** [@CypherMK](https://discourse.nodered.org/u/CypherMK)\
**Replies:** 58\
**Last updated:** [29 June 2019 16:52 UTC](https://discourse.nodered.org/t/detect-if-somebody-is-taking-a-shower/12125 "2019-06-29T16:52:33Z")

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I'm trying to make my xiaomi temperature sensor detect if I'm taking a shower or not. It's this one: https://gloimg.gbtcdn.com/soa/gb/pdm-product-pic/Electronic/2018/10/24/goods\_img\_big-v5/20181024111421\_98590.jpg I'm …

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## [Extract specific text and associated value from a string?](https://discourse.nodered.org/t/extract-specific-text-and-associated-value-from-a-string/12707)

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**Author:** [@nodecentral](https://discourse.nodered.org/u/nodecentral)\
**Replies:** 15\
**Last updated:** [29 June 2019 10:15 UTC](https://discourse.nodered.org/t/extract-specific-text-and-associated-value-from-a-string/12707 "2019-06-29T10:15:10Z")

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Hi, I’m struggling with this one; I able to receive a very long string on the status of my HDMI matrix, and what I want to do is extract sections of it to create new/separate payloads to then work with . Here’s an exa…

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## [Chart node plotting issue](https://discourse.nodered.org/t/chart-node-plotting-issue/12706)

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**Author:** [@ALOKA1432](https://discourse.nodered.org/u/ALOKA1432)\
**Replies:** 14\
**Last updated:** [29 June 2019 09:21 UTC](https://discourse.nodered.org/t/chart-node-plotting-issue/12706 "2019-06-29T09:21:19Z")

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chart node is plotting only 12 points whereas there are var 30 points in the payload The code is below, '''series =\["Average pressure","x"\]; var labels = \["Labels"\]; var data = ; var i; for (i = 0; i \< msg.payload.…

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## [Help with ramping dimmers? Im racking my brain!](https://discourse.nodered.org/t/help-with-ramping-dimmers-im-racking-my-brain/12694)

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**Author:** [@eyeiaye](https://discourse.nodered.org/u/eyeiaye)\
**Replies:** 9\
**Last updated:** [29 June 2019 07:07 UTC](https://discourse.nodered.org/t/help-with-ramping-dimmers-im-racking-my-brain/12694 "2019-06-29T07:07:19Z")

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Hello, Hey all thanks so much for everything thus far, Ive enjoyed reading! Here is my first question I feel like I may have bitten of more than I can chew - I'm new to Hass.io AND node-RED. I need some help... I want…

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## [Queue messages for x seconds](https://discourse.nodered.org/t/queue-messages-for-x-seconds/12705)

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**Author:** [@swiftnesses](https://discourse.nodered.org/u/swiftnesses)\
**Replies:** 2\
**Last updated:** [28 June 2019 19:48 UTC](https://discourse.nodered.org/t/queue-messages-for-x-seconds/12705 "2019-06-28T19:48:39Z")

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Hello, I have a scenario whereby I need a message to live in a queue for x seconds after it's added (not released x seconds apart, but released x seconds from when it arrived!). I've tried the simple queue node but it …

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## [Turn on timer when achieved certain value](https://discourse.nodered.org/t/turn-on-timer-when-achieved-certain-value/12697)

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**Author:** [@afiqkimii](https://discourse.nodered.org/u/afiqkimii)\
**Replies:** 5\
**Last updated:** [28 June 2019 19:12 UTC](https://discourse.nodered.org/t/turn-on-timer-when-achieved-certain-value/12697 "2019-06-28T19:12:25Z")

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Hi,my name is kimi How do I create a timer that started counting after the value in the flow exceeded certain value? Im using an external switches that allows more voltage to pass through after I clicked to the respect…

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## [Export Sqlite data to CSV file](https://discourse.nodered.org/t/export-sqlite-data-to-csv-file/12688)

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**Author:** [@Rapidsafeguard](https://discourse.nodered.org/u/Rapidsafeguard)\
**Replies:** 5\
**Last updated:** [28 June 2019 15:03 UTC](https://discourse.nodered.org/t/export-sqlite-data-to-csv-file/12688 "2019-06-28T15:03:27Z")

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I am working on export report in csv file from sqlite database. I have used CSV node and It is working fine but when I debug file node it gives empty result. I am little bit stuck.

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## [What is best, Flask-API, MQTT, PI-Gpiod, OPnVpn etc](https://discourse.nodered.org/t/what-is-best-flask-api-mqtt-pi-gpiod-opnvpn-etc/12006)

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**Author:** [@nksky](https://discourse.nodered.org/u/nksky)\
**Replies:** 19\
**Last updated:** [28 June 2019 12:37 UTC](https://discourse.nodered.org/t/what-is-best-flask-api-mqtt-pi-gpiod-opnvpn-etc/12006 "2019-06-28T12:37:26Z")

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Hi everyone, Quick question, I am getting very confused with all the protocols and methods of transferring data securely and easily. I have a PI3, And a remote server running Ubuntu, Node-Red and MongoDB. From the serv…

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## [Send or retrieve data from Microsoft Azure](https://discourse.nodered.org/t/send-or-retrieve-data-from-microsoft-azure/12684)

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**Author:** [@jason\_tien](https://discourse.nodered.org/u/jason_tien)\
**Replies:** 1\
**Last updated:** [28 June 2019 11:10 UTC](https://discourse.nodered.org/t/send-or-retrieve-data-from-microsoft-azure/12684 "2019-06-28T11:10:08Z")

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Hi everyone, I would like to ask how to read and write the query from Microsoft Azure. Previous I using MSSQL to store the data so example my query like following picture. I insert the data to MSSQL, but now I want i…

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## [Modbus Serial sequence](https://discourse.nodered.org/t/modbus-serial-sequence/12668)

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**Author:** [@pautorras](https://discourse.nodered.org/u/pautorras)\
**Replies:** 4\
**Last updated:** [28 June 2019 08:35 UTC](https://discourse.nodered.org/t/modbus-serial-sequence/12668 "2019-06-28T08:35:04Z")

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Hi, I'm newbie in node red. For me it's an excellent tool with a high potential. In a RPI3B+ I have made a sqlite DB write, dashboard and openweathermap get, and it's working ok, but I need to solve two problems that …

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## [Does node-red have a built-in Grid component](https://discourse.nodered.org/t/does-node-red-have-a-built-in-grid-component/12678)

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**Author:** [@limengsong](https://discourse.nodered.org/u/limengsong)\
**Replies:** 3\
**Last updated:** [28 June 2019 08:15 UTC](https://discourse.nodered.org/t/does-node-red-have-a-built-in-grid-component/12678 "2019-06-28T08:15:33Z")

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Does node-red have a built-in Grid component? Is there a demo?

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## [How to create email alerts for wireless sensor](https://discourse.nodered.org/t/how-to-create-email-alerts-for-wireless-sensor/12677)

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**Author:** [@fredy76](https://discourse.nodered.org/u/fredy76)\
**Replies:** 2\
**Last updated:** [28 June 2019 08:04 UTC](https://discourse.nodered.org/t/how-to-create-email-alerts-for-wireless-sensor/12677 "2019-06-28T08:04:21Z")

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Hi, I am new to node-red. I have used this wireless temperature and humidity sensor to send data to the node-red dashboard. But I want to know how to create email alerts. So I can get its data remotely. Thanx for the he…

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## [this.activeNodes\[id\] returns null](https://discourse.nodered.org/t/this-activenodes-id-returns-null/12641)

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**Author:** [@pauldeng](https://discourse.nodered.org/u/pauldeng)\
**Replies:** 1\
**Last updated:** [28 June 2019 05:59 UTC](https://discourse.nodered.org/t/this-activenodes-id-returns-null/12641 "2019-06-28T05:59:11Z")

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Hi all, I am developing my custom node. After I redeploy application via the editor, my node sometimes does not send out the messages as expected. By looking at the code, my custom node calls this.send(msg) and it som…

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## [Send json tcp request](https://discourse.nodered.org/t/send-json-tcp-request/12653)

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**Author:** [@Kayle](https://discourse.nodered.org/u/Kayle)\
**Replies:** 3\
**Last updated:** [28 June 2019 05:49 UTC](https://discourse.nodered.org/t/send-json-tcp-request/12653 "2019-06-28T05:49:08Z")

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Hello all, I'm trying to get data from my 3d printer through tcp port 35. I was able to sniff the packages between my computer and the printer with wireshark, but I was not able to get data with node red. It seems that …

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## [Multiple instances using Docker](https://discourse.nodered.org/t/multiple-instances-using-docker/12613)

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**Author:** [@Stylo](https://discourse.nodered.org/u/Stylo)\
**Replies:** 4\
**Last updated:** [28 June 2019 05:05 UTC](https://discourse.nodered.org/t/multiple-instances-using-docker/12613 "2019-06-28T05:05:00Z")

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Is it possible to have multiple instances of Node-Red running on the same machine/server using docker, and if so is it possible to access each simply through different ports?

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## [Save MQTT data to SQLite](https://discourse.nodered.org/t/save-mqtt-data-to-sqlite/12477)

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**Author:** [@RickyChan21](https://discourse.nodered.org/u/RickyChan21)\
**Replies:** 13\
**Last updated:** [27 June 2019 12:43 UTC](https://discourse.nodered.org/t/save-mqtt-data-to-sqlite/12477 "2019-06-27T12:43:53Z")

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I have an MQTT client on Node-RED subscribed to a client that publish temperature. Now I want to save this value into SQLite. Any solutions?

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## [Cloud Integration](https://discourse.nodered.org/t/cloud-integration/12498)

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**Author:** [@Corinna](https://discourse.nodered.org/u/Corinna)\
**Replies:** 7\
**Last updated:** [27 June 2019 12:11 UTC](https://discourse.nodered.org/t/cloud-integration/12498 "2019-06-27T12:11:10Z")

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Hi guys, How can Node-Red be integrated in a cloud environment e.g. in Azure? As far as I understand Node-Red is a monolithic component consisting of a frontend and a backend. If I want to integrate it for several user…

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## [File Lister node not returning filename unless Pi is logged in](https://discourse.nodered.org/t/file-lister-node-not-returning-filename-unless-pi-is-logged-in/12462)

<div class="topic-metadata">

**Author:** [@GregorR1](https://discourse.nodered.org/u/GregorR1)\
**Replies:** 38\
**Last updated:** [27 June 2019 09:12 UTC](https://discourse.nodered.org/t/file-lister-node-not-returning-filename-unless-pi-is-logged-in/12462 "2019-06-27T09:12:05Z")

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Hi, I'm trying to use the filename node to find a file on a USB drive and use this to tell the File Write node where to write to. However, this is not working unless the Pi is logged in and I'm getting a "File could no…

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