Currently, the Trigger node can be configured to fire one time when an incoming message is not rec'd. I would like an option that it will continually trigger at the specified interval if a message is not rec'd (I. E., until a valid message is rec'd). My current need is to continue to send data to a graph until the actual data flow is rec'd again. The triggered data is to indicate on the graph that data was not rec'd during the indicated time frame. As it is, the graph line will be drawn between the last rec'd data point and the first resumed data point, without any indication that data was lost.
Another example might be to ping a device every 5 minutes, and if the ping is unsuccessful use the Trigger node to send a reset command. The Trigger node would know when to send the first reset, but if a ping is not restarted I'd want the Trigger node to send another reset after 5 more minutes.
I'm still new to NR and I'm sure there's a way to do what I need, but I think an additional option in the Trigger node would be a great place to put it. Thanks for listening.

In https://cookbook.nodered.org/basic/join-streams you've mentioned

it will send on a message each time it receives at least one message from three different topics

But I got a message from this join node when I inject a same temperature node 3 times,
{ temperature: 10 } (It has no humidity and pressure).

Is that page said correct especially "at least three different topics"?

The class 'l84' doesn´t exists more :-(

I am attempting to learn how to use Node Red for a project that I am working on. I have installed Node Red on my workstation it appears to be working correctly. Opening Node-red @ 127.0.0.1:1880.

Using the Node Red Cookbook as a tutorial, I am trying to generate an interactive web page. Starting with HTTP endpoints, I follow the instructions, get a HTTP In node, a Template node, HTTP Response node and wire them together. I add the HTML code to the Template node.

What address do I put in the browser to see "Hello World"? 127.0.0.1:1880/???

I am missing how to view the response and need this most basic step to move on.

Thanks,

Jim

Hello

I think the css selector has changed. It now works with .package__counter___2s5Ci instead of .pretty-number

many thanks

HTML Node has wrong flow text. ".pretty-number" should be changed to ".node-red-latest-version'

hi

please mention that use can use # as a wilcard in topic, for example for messages coming from zigbee2mqtt
zigbee2mqtt/#

' The Change node changes this to msg.post'

Does the change node serve any purpose in this example?
The http request node info reads;

'..if the url is set to example.com/{{{topic}}}, it will have the value of msg.topic automatically inserted.'

i.e. msg.topic not msg.post

Hello! The "file-in" node has been replaced by "file-path-to-buffer". (https://cookbook.nodered.org/http/serve-a-local-file)
thanks!

The flow does not match the picture shown in the recipe's page. As a matter of fact, the flow has a bad CSS selector.

The URL in the example http://vancouver.craigslist.org/search/sss?format=rss&query=cars returns error.

flow deployed
"curl http://localhost:1880/hello"
gives :
Unauthorized
..
I think this is due to basic authorization security. user ... user/password

(Is it possible to include in request ie curl statement ?) hum...

if done with a web browser (ie http://localhost:1880/hello) , the browser asks for credentials, then the node works and gets triggered.
so the curl could be
"curl http://localhost:1880/hello -u user"
this will prompt for password. With correct password the correct response will be displayed.
This, of course, is not ideal for automated process.

How to determine the path for the file?

The intent of this recipe was to set the url using the node's built-in templating functionality - not to use a Template node.

I would suggest the problem statement should be:

You want to dynamically set the URL of an HTTP request where only parts of the url change between requests.

Can we simply monitor CPU, better daily graph of CPU usage, to be sure we haven't benn hacked?
Can you please explain how to wipe service (as you suggested) and reinstall it safely without reinstall Raspbian and reconfigure all? (in my case not few time)
Are modules in github (or installing by palette) possible infected? Or the hack can come ony from internet?
How to change the TCP port number listening?

SOrry for lot of questions, thanks for help!

The "this recipe" link at the bottom shows 404 page.

It does not work anymore because the "google / finance" page has been modified. (https://cookbook.nodered.org/http/simple-get-request)

The example seems not working. I could not see any output message at the debug node.

Small Feedback for documentation:
Your div block is too small and narrow and need to scroll everytime to check the contents.
Its too much annoying as content kept in small and narrow div, its make difficult for comparison with respect to other nodes.

Better remove this line which is no use ie max-height and the overflow-y:
div.flow pre {
/* max-height: 100px;
overflow-y: scroll; */
}

for each example, I can select 'show flow' and then press 'copy'.

How could I paste this flow now into Node-RED (i.e. the interactive) flow editor?

Example recipe of http/set-query-string doesn't work because of retiring YQL service since 3rd Jan 2019.
https://twitter.com/ydn/status/1079785891558653952

Suggests going to #docs in Slack to discuss/contribute, but Slack doesn't appear to have such a channel (I see only #faq, #general, #projects, and #random).

The URL in the request node is incorrect, should be:
https://nodered.org/

Hi,

neat trigger solution ... However, I just tried it out and now have a message in the debug window every two seconds.

Please add a tip to the page how to turn it OFF again!

Thanks, MrWatson

[{"id":"2c6873d2.992abc","type":"mqtt out","z":"eda2a949.74ea98","name":"","topic":"sensors/livingroom/temp","qos":"","retain":"","broker":"407a01e4.6b637","x":330,"y":80,"wires":[]},{"id":"d9beed59.94155","type":"inject","z":"eda2a949.74ea98","name":"","topic":"","payload":"22","payloadType":"num","repeat":"","crontab":"","once":false,"x":150,"y":80,"wires":[["2c6873d2.992abc"]]},{"id":"be80048.8f232f8","type":"mqtt in","z":"eda2a949.74ea98","name":"","topic":"sensors/livingroom/temp","qos":"2","broker":"407a01e4.6b637","x":170,"y":160,"wires":[["8640b8ff.f82ff8"]]},{"id":"8640b8ff.f82ff8","type":"debug","z":"eda2a949.74ea98","name":"","active":true,"console":"false","complete":"false","x":370,"y":160,"wires":[]},{"id":"407a01e4.6b637","type":"mqtt-broker","z":"","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"willTopic":"","willQos":"0","willPayload":"","birthTopic":"","birthQos":"0","birthPayload":""}]

I don't know what type of node the 'set-headers' node is.

Only half of the recipes on this page contain links, the others have none..

Are you sure you want to link to page under http category from basic?

There's a link - [Simple GET request](/http/simple-get-request) in /_includes/indexes/http.md

There's also a similar link - [Extracting data from an HTML page](/http/simple-get-request) in /_includes/indexes/basic.md

Yahoo URL must have changed, the example does not find "l84".

many links on the basics page are incomplete not working.

I believe this page is outdated, please check:

https://github.com/node-red/node-red/wiki/Deprecated:-Message-properties-overriding-set-node-properties

if there is a workaround for this limitation can you please also include the reference?

How can iterate the msg.payload Object array.

I have an message array as below from the CSV file, how can i have a function to iterate.

Regds
Rahul.

[{"Sensor_Value":"0-200","Computed_Value":10},{"Sensor_Value":"200-300","Computed_Value":20},{"Sensor_Value":"300-400","Computed_Value":30},{"Sensor_Value":"400-500","Computed_Value":40},{"Sensor_Value":"500-600","Computed_Value":50},{"Sensor_Value":"600-700","Computed_Value":60},{"Sensor_Value":"700-800","Computed_Value":70},{"Sensor_Value":"800-900","Computed_Value":80}]

https://cookbook.nodered.org/http/set-request-header

in this example, it always return the "Unauthorized: Access denied"

Hello,

Your example does not work correctly because the website has changed.

The CSS selector's .pretty number has been changed to .package__counter ___ 2s5Ci.

Can you please correct it?

Many Thanks!

Regards
Dirk

Can we have optional parameters in the url (at the end, esp)? It would be nice to know if I can't or how to specify if I can.

Why are some links missing in the examples? thanks!

Where do I find the "File in" node?

I am writing a custom node, and the intention is that on a successful connection, a token is generated along with some additional attributes that I would like to persist on the node config.

Standard approach has the config node attributes and credentials directly store the returned data. However, this may change over time based on periodic checks, and it should reflect that new state on the config node without having to redeploy.

So the approach I believe may work is to use the http communication with the httpAdmin nodes to set and get the state. I can then query that state on the http oneditprepare and set it on successful config.

I was looking to then use the global context within the httpAdmin endpoints:

RED.httpAdmin.get("/allow2/paired/:id", RED.auth.needsPermission('Allow2Pairing.read'), function(req, res) {
    const nodeId = req.params.id.replace(/\./g, '_');
    const pairing = JSON.parse(RED.globalContext.get('allow2_pairing_' + nodeId) || "{ paired: false }");
    res.json(pairing);
});

RED.httpAdmin.post("/allow2/paired", RED.auth.needsPermission('Allow2Pairing.write'), function(req, res) {
    const nodeId = req.body.id.replace(/\./g, '_');
    RED.globalContext.set('allow2_pairing_' + nodeId, JSON.stringify({
        paired: true,
        children: req.body.children
    }));
    res.json({ status: 'success' });
});

This means that should the token no longer be valid, I can detect that on opening the config node and present the correct interface to gain a new token (shouldn't happen very often). And I can use the config id to retrieve the "children" information at any time to correctly show dropdown values in other nodes.

The complexity is, I believe, that I can't get to the global context from 'RED', only from a node itself, but as none may be deployed in a vanilla installation, then I cannot get to the global context. Is there a way to get a handle to the global context from "RED"?

Alternately, I can also potentially cache the value in memory and then perform the write to global context on deployment, that is a bit of a kludge though.

Alternately, I could also do my own direct file persistence using OS functions from within httpAdmin endpoints.

Any suggestions on a better "preferred" approach?

Example does not work anymore - webpages changed, I guess.
C.

From this sentence: "Use an Inject node configured to fire once on start."

Please explain HOW to configure an inject node to fire once on start. :-)

In version 0.18.6 the inject node option to fire once after deploy is not available anymore, despite the documentation says so.

Where do I find the "File In" node ?
I'm running on Bluemix so I guess its not available there. I used Dropbox as an alternative which works fine