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Questions tagged [node-red]

For questions related to Node-RED, a programming tool used in the Internet of Things based on Node.js.

5
votes
1answer
24 views

node-red - Replicating message flows per MQTT subscribing client

I want a MQTT subscription client to consume messages from AWS IoT broker. On AWS IoT broker, wild card topic subscription is not supported. In our use case, we know the upper bound of number of ...
4
votes
1answer
35 views

node-red - Metrics display with pm2?

The Node-RED documentation is clear - set metrics to true to track flow execution and memory usage information. So, I stopped Node-RED with pm2, edited the settings.js file and started Node-RED. But, ...
4
votes
0answers
34 views

Dashboard of historical data in iot_datasourse

I have historical data stored in an SQL database as date in the format (2017.10.27 12:00:25) and the corresponding temperature in the format (26.55). I am using the node iot_datasourse to show the ...
6
votes
1answer
132 views

node-red - node.error does not stop flow sometimes

I think, node.error does not halt the flow in all cases. My aim is to catch errors, save the payload and stop the flow. Please refer the observations and experiments below. Observation Function ...
6
votes
1answer
63 views

node-red - Units of work

I have a MQTT Input node that kicks of database operations (SELECT and INSERT) for PostgreSQL database. The database operations are done with node-contrib-postgres-multi.Since these operations are ...
6
votes
1answer
411 views

How to add payload to a posted MQTT topic?

I am experimenting with node-red, connecting it to my MQTT broker. The input (listening to a topic) works fine. I also would like to send to a topic some payload ipon some triggers. In the example ...
8
votes
2answers
116 views

Does Node-Red support multi-request flows (i.e. sessions)?

I gave Node-Red a short test-run this week. It is not clear to me whether it supports flows that encompass more than one request. Does Node-Red have a request-per-flow or a session-per-flow model? ...