IoT SIG - 2020-08-25

hi! :)

Hi!

Howdy!

I invited Martin Kollaard to this MUC, because he lets "things" talk XMPP and I'm curious as a cat to learn about it ;-)

Yes, mostly it are computer btw, but doing different things. Mostly it are narrowcasting screens in supermarkets across the country :)

some versions ago it did check every 30 minutes if it is running the latest content, but we wanted to make changes realtime. so we needed a way that makes a stable connection between backend and device.

and this is realised via bots in MUCs?

or direct chat messages between bots?

Martin Kollaard ^

direct messages

it started with displays with prices on it, this needs to be able to update fast when there is a wrong price on it :)

but slowly we moved everything to it

doesn't that sound like a perfect fit for PubSub?

Most of devices do not use the same content, so it was easier not using pubsub

sure, makes sense!

difterent per supermarket, and different per area in supermarket.

Now we just send json in messages. But I guess it was also possible to use just send stanzas with data or use rpc model.

Martin Kollaard "XEP-0335: JSON Containers"? This is what we will use in my company, but over PubSub.

ah I did not know that one, is that only for over pubsub?

oh can also be used in a iq, ok nice :)

why is it deferred :(

Things get deferred due to inactivity

It can be revived if there is interest in it, and if there are enough implementations and feedback from community members, it can get advanced to the next stage

(from which it will never become deferred)

ok :)

> sure, makes sense! Why?

I guess because pubsub is for broadcasting data to multiple entities, but if you just have a single subscriber then you may as well send directly to them

pubsub would have the nice feature that it can persist the data and if you needed to e.g. replace the device, it could fetch the latest published data automatically

and would also solve for any connection reliability issues without needing to resort to MAM

offcourse you can create a pubsub per player, but that is a overhead I think :P

you could use PEP btw. if every thingy has their own JID, but the thingy owns the node and must give publish permission on PEP - is this even possible?

Pretty sure you can affiliate other entities with your PEP service, though I've never seen it done

and obviously the server can always do anything