HTTP-CoAP proxy: The HTTP-CoAP proxy enables transparent
communication with CoAP devices. The proxy logic can
be extended to better support monitoring applications and limit
the amount of traffic injected into the IoT peripheral network. For
instance, it is possible to specify a list of resources that need to be
monitored, so that the server can autonomously update the
entries in a cache related to those devices. This mechanism can
be supported by two different approaches: 1) by polling the
selected resource proactively, thus enabling the implementation
of traffic shaping techniques at the proxy or at the gateway
and 2) by subscribing to the selected resource using the
“observe” functionality of CoAP, thus enabling the server on
the node to send the updates only when the value measured
by the sensor falls outside a certain range. This service is colocated
on the switchboard gateway in the Padova Smart City
system, though it could also be placed in the backend servers,
thus making it possible to control multiple gateways by using a
single proxy instance
HTTP-CoAP proxy: The HTTP-CoAP proxy enables transparentcommunication with CoAP devices. The proxy logic canbe extended to better support monitoring applications and limitthe amount of traffic injected into the IoT peripheral network. Forinstance, it is possible to specify a list of resources that need to bemonitored, so that the server can autonomously update theentries in a cache related to those devices. This mechanism canbe supported by two different approaches: 1) by polling theselected resource proactively, thus enabling the implementationof traffic shaping techniques at the proxy or at the gatewayand 2) by subscribing to the selected resource using the“observe” functionality of CoAP, thus enabling the server onthe node to send the updates only when the value measuredby the sensor falls outside a certain range. This service is colocatedon the switchboard gateway in the Padova Smart Citysystem, though it could also be placed in the backend servers,thus making it possible to control multiple gateways by using asingle proxy instance
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