Ignition data exchange with docker python files

Ignition
1

I am thinking about using redis to exchange data, but when importing redis to the pylib, it has error when running it.

It might be a big amount of data exchanging at ms speed with multiple clients accessing it.

I can use opcua, but it's just not a neat way.

or any other nosql database I can use?

2

Tried Jedis, redis-python, none of them work on ignition.

3

I spent a few hours to try out the Redis solution, still not working from Ignition side.

Then I moved on to setup a Sparkplug MQTT client to talk to the Ignition gateway, it's ok to pub/sub some tags, but the amount of work will increase tremendously if I want to share hundreds of tags, including JSON files and UDT instances, between Ignition and external python files.

Just wonder what could be the easiest and neat way of exchange a few hundred data between ignition and external python file?

Any suggestion is welcomed.

4

WebDev. Make an API that python can call.

Or, may an API with python that Ignition can call.

5

I was using web dev api mainly for the front end React communication

I will have a try to use python script to call the API.

Meanwhile trying the new MongoDB module, but somehow still cannot get the local MongoDB setup correctly in the Connectors page.

6

Just to update:
The mongo db is working fine so far exchanging data between ignition and docker python files.

I chatted with a IT engineer who is working on Real Time Operating System design, he said, no matter how fancy Redis/MongoDB/Other DB are, the local binary file read/write is always the easiest and fastest way to exchange data between different applications within the same PC.

Not sure whether anyone has different opinion to it?

Cheers

7

I would say shared memory regions with lockless ring buffers. Basically the technology used for virtual machine host-guest virtio drivers.

1 Like
8

Thanks for sharing the experience.

Ring buffer is new to me, need a bit time to research.