Networking Reference
In-Depth Information
is performed using the traditional TCP/IP protocol stack between the application
and the gateway. Once the gateway receives the HTTP request, the SIM components
process the message content and then build a new message in the specific format
of the WSN platform whose nodes need to be tasked to meet the request. This new
message in the format understood by the sensor nodes is sent through a serial cable
that connects the desktop computer to the wireless communication component (part
of the gateway implementation that acts as the WSN sink node). The message is
then forwarded over radio to the sensor nodes by broadcast and will be accepted by
those nodes whose ID matches the one specified in the request or by all nodes if
the broadcast address was specified in the request. Upon reception of the request,
the sensors perform the necessary actions the request demands, generating the reply
messages in the networks specific format. Reply messages sent by the sensors are
processed in the gateway and translated to HTTP/TCP/IP format before sent back to
the requiring application.
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