Also, we've made some web libraries to make using mbed Device Connector even easier.

We have a Node.js library here: https://github.com/ARMmbed/mbed-connector-api-node

And a Python library here: https://github.com/ARMmbed/mbed-connector-api-python

Hi Brian,

thanks for feedback. I am aware of the outlined resources, and I was already playing around with mbed Client Java webapp outlined here: https://github.com/ARMmbed/mbed-webapp-example/.

Based on what I can see is that for long polling the app always reopens the connection after 25s with a "https://api.connector.mbed.com:443/v2/notification/pull"

In the mbed device connector api reference there is the following note:

It is mandatory to create a persistent connection, by sending the Connection: keep-alive header, to avoid excessive TLS handshakes

whenever I use curl though with

curl -s -H 'Connection: keep-alive' -H 'Authorization: Bearer <myBearer>' https://api.connector.mbed.com/v2/notification/pull

the commend breaks after the first notification.

Can you please elaborate on how I am getting a constant stream of events and keep the curl alive?

Hi Rainer,

Thanks for elaborating a bit on your question, I think I may have been a bit eager in my answer :)

If I understand your question now, it sounds like what you're asking for is something closer to a WebSocket connection? Where the connection is persistent but the data comes in as it's available? To my knowledge this kind of support does not exist in mbed Device Connector.

If I misunderstood your question (again!), would you mind clarifying a bit more?

Thanks,

Brian

Hi Brian,

thanks again for your feedback ...

Yes, I strongly believe that Device Connector has to deliver the incoming events either through

1) Server Sent Events (prefered) or

2) Websockets

If neither of this capabilities are available, then I don't see any commercial usage of Device Connector due to the overhead generated by the provided long polling and web hooks alternatives.

A good example on how this should work is particles "Device Connector" https://docs.particle.io/reference/api/#get-a-stream-of-your-events through Server Sent Events.

Is there a roadmap of mbed device connector where I can see what's coming in regards to functionality so I can adjust my plans accordingly?

Hi Rainer,

Thanks for your feedback on Device Connector, I've passed it on to the Device Connector team!

I'm not aware of a roadmap that has been released for mbed Device Connector, but if I find one I'll try to post it here.

Thanks,

Brian