>right and the URI, returned to the 'user agent' can be stored on your 'application', like UPS.
No. The WebLink URL of type "push:channel" returned from the registration request is not shared. When an application requests a channel, the device uses the "push:channel" URL to create a new channel for the application. This channel creation request will contain a "Location" header with the URL that the application will share with a backend, enabling it to send notifications. 

>I wonder why I (being a device/user-agent) explicitly have to create that channel. 
I think the spec needs to cater for the ability to have a single web browser case where there a service worker serves multiple applications. For a mobil device it might not make sense to have this shared, and in this case the API can hide the registration. From the end users point of view it could be seen as only a register, something like:
http://w3c.github.io/push-api/#example

>Not sure, but I think it might be useful to have an unmonitor, to quite the abo of some content, e.g. at some point  #Rihanna might get boring :-) 
If that is the case then I think you can delete the channel. Since the "device" is not specific to a single applications (it could be serving multiple) it still need to be monitoring to receive notifications for other channels.

>Or am I having a misunderstanding of the concept here ?
Well if you are, then it is me doing a bad job at explaining/describing things. I should say that I'm still learning and might not have correct answers for things yet. 




On 2 December 2014 at 08:49, Matthias Wessendorf <matzew@apache.org> wrote:


On Tue, Dec 2, 2014 at 8:40 AM, Daniel Bevenius <daniel.bevenius@gmail.com> wrote:
>Not sure I get why that is not created on default. When I am not doing the create-channel, an 'application' (e.g. curl or UPS) has no location to send a >payload for the device, right?
My understanding is that the device registers not the application, which for example could be a web browser/user agent.

right and the URI, returned to the 'user agent' can be stored on your 'application', like UPS.

I wonder why I (being a device/user-agent) explicitly have to create that channel. 

 
It will then create channels for potentially multiple applications.

ok, I see that a few extra 'creates' are needed, for multiple channels. But what's the use case of a register without creating a channel? Just simply to monitor on an existing or different channel ?
 
In the case of usage with the Push-API, a service worker would handle the interaction with the WebPush server and hand out channels to applications. It would also be responsible for handling the inbound notifications, and can take different actions depending on the state of the webapp (post it to an open window, store it, show notification).

>Can a device have multiple monitoring channels? (e.g. channels per topic, like #Rihanna #ZZtop #ACDC ? Can a device 'un monitor' ? 
I think that an application would create separate channels for topic it requires. 
Not sure about unmonitoring. I've not see anything about that (unless I completely missed it)

Not sure, but I think it might be useful to have an unmonitor, to quite the abo of some content, e.g. at some point  #Rihanna might get boring :-) 
Well, sue I can still 'ignore' it in my code of the service-worker, but would be nice if that guy was no longer bothered :) 

Or am I having a misunderstanding of the concept here ? 


 





On 1 December 2014 at 17:49, Matthias Wessendorf <matzew@apache.org> wrote:
Hi,

after performing register, I get URIs for my channel/monitor, like:


register
 [streamid:3] ChannelLink: webpush/7df2add5-ec4b-42a2-805f-5f8fcf8faa96/channel, MonitorLink: webpush/7df2add5-ec4b-42a2-805f-5f8fcf8faa96/monitor


I wonder why I do have to explictly create the channel?
create-channel webpush/7df2add5-ec4b-42a2-805f-5f8fcf8faa96/channel

Not sure I get why that is not created on default. When I am not doing the create-channel, an 'application' (e.g. curl or UPS) has no location to send a paylload for the device, right?

 

Can a device have multiple monitoring channels? (e.g. channels per topic, like #Rihanna #ZZtop #ACDC ? Can a device 'un monitor' ? 


Thanks :-)  


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