RE: [WoT IG]: Issues with bi-directional communication for CoAP and other IoT-related protocols

Yes, this depends on the context. An example when an IoT device connects directly to the cloud is a device running LTE MTC, i.e. it is directly connected to the mobile network and has an IPv6-address.

BR
  Claes

From: Dave Raggett [mailto:dsr@w3.org]
Sent: den 17 november 2015 19:28
To: Jason Proctor
Cc: Nilsson, Claes1; Jaime Jiménez; Hund, Johannes; public-wot-ig@w3.org
Subject: Re: [WoT IG]: Issues with bi-directional communication for CoAP and other IoT-related protocols


On 17 Nov 2015, at 18:13, Jason Proctor <jason@mono.hm<mailto:jason@mono.hm>> wrote:

greetings all

IMHO, the assumption that the device still has the same IP address as it had the last time it and the cloud server communicated is problematic.

in my mind, for various reasons, there will likely be a proxy server on the same network as the device, whose job it is to proxy stuff on behalf of an entity requesting access (it might also do some auth, etc).

so the device communicates its abstracted address (eg HeartMonitor._wot._tcp.local for mDNS) to the cloud server, facilitating an address-neutral discovery on the way back. the proxy could also set up port forwarding etc for the duration of the connection.

On Tue, Nov 17, 2015 at 3:39 AM, Nilsson, Claes1 <Claes1.Nilsson@sonymobile.com<mailto:Claes1.Nilsson@sonymobile.com>> wrote:
Hi Jaime,

The slides are here: https://lists.w3.org/Archives/Public/public-wot-ig/2015Oct/att-0104/Issues_with_bi-directional_communication_for_CoAP_and_other_IoT_related_protocols.pdf


This will depend upon the context.  In some cases, having a local powered gateway/hub that sits between the cloud and the IoT device is the way to go. This makes it easier to deal with sleepy devices, strong security, and to preprocess/multiplex sensor data to reduce the load on the cloud server.

 In other cases, the IoT device will connect directly to the cloud. Maintaining a “connection” through a NAT Firewall has its costs, so some such devices will be directly connected. A hybrid approach has the firewall in the cloud. With growing interest in low power wide area networks for sensors, that could be an increasingly popular choice.

—
   Dave Raggett <dsr@w3.org<mailto:dsr@w3.org>>

Received on Wednesday, 18 November 2015 08:56:17 UTC