CoAP

Constrained Application Protocol (CoAP) est un protocole applicatif d'invocation de requête-réponse pour des réseaux de capteurs sans fil IPv6/LoWPAN

Motivation : HTTP/REST-like protocol for constrained sensors

• 128KB FlashRAM and 4KB RAM
• Battery consumption (sleep and periodical wakeup)
• Interaction
  • Request-response
  • Subscribe-Notify
• REST (READ, WRITE, CREATE, DESTROY)
• Resource discovery
  • /profile URI multicast + DISCOVER method
• Protocol binding
  • UDP and UDP Multicast (16-bit sequence number for reliability)
  • Optionally TCP without "stop and wait"
• Caching
  • Important since sleeping mode
  • CoAP proxy (for subscription ...)

Client Implementations

• Copper : Firefox plugin for COAP

Client Implementations

• Python http://coapy.sourceforge.net
• C
• Java
  • Californium Java client and server (and OSGi wrapper bundle)
• Javascript & Node.js
  • Node-CoAP
  • Ponte