A CoAP based SOAP transport binding

  • Moritz G
  • Golatowski F
  • Timmermann D
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A huge momentum towards IP enabledWireless Sensor Networks (WSN) appeared through the emerging 6LoW- PAN protocols (i.e. IPv6 over Low power Wireless Per- sonal Area Networks). By usage of existing cross domain open standards in contrast of proprietary solutions, de- ployments of WSNs are not tailored too tight for specific applications. Nevertheless, 6LoWPAN is only the first step for the usage of internet protocols in WSNs. Still ef- forts on higher layers on top of 6LoWPAN are an urgent need to provide seamless connectivity and interaction of highly resource constrained devices with higher valued services. This paper describes a new approach to bind SOAP to the emerging Constrained Application Protocol (CoAP) protocol. Thereby CoAP provides a lightweight but reliable transport binding for SOAP based protocols. Compared to the widespread TCP based HTTP binding, round trip times can be reduced by 43% in an exemplary scenario. Combined with dedicated XML compressors like the Efficient XML Interchange format (EXI), existing heavy weight SOAP based protocols become also applica- ble in WSNs. 1

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