Hello,
I was wondering if it is possible to inject timestamp values that are sub-second, e.g. in milliseconds. It seems like the inject node can only repeat every 1s.
Thanks,
Hello,
I was wondering if it is possible to inject timestamp values that are sub-second, e.g. in milliseconds. It seems like the inject node can only repeat every 1s.
Thanks,
I have done this before by using a decimal value, for example 0.1 would be 100 ms. HOWEVER, this can overload the Node-Red engine. I wouldn’t recommend doing much of this, even though it’s possible. Use at your own risk 
Thanks, I’ve tried setting it to 0.1 == 100ms, but it seems to halt data ingestion on my receiving end. It makes me wonder if it is due to the OSI PI WEB API Node that I am using.
Interesting. How fast do you need the data?
Hey Dan,
Ideally, I would like to ingest at the speed of the sensors itself. Looking at the spec. sheet the OPTO22 RIO has a data refresh rate of 450ms, which seems to be a hard limit.
With that new information, I think a new approach might work better for you…
MQTT with Sparkplug. Its built in to the RIO and is perfect for publishing its I/O data.
OSI Pi now has an MQTT Sparkplug connector; https://techsupport.osisoft.com/Products/PI-Interfaces-and-PI-Connectors/PI-Connector-for-MQTT-Sparkplug/Interface-Details/
This will totally bypass the scan rate limitations of Node-RED. In fact, it would really stream line the configuration and maintenance of moving the data from RIO to OSI Pi.
MQTT will be much faster than any RESTful interface.