68 lines
2.5 KiB
Text
68 lines
2.5 KiB
Text
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This is the new example for the Erbium REST Engine
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==================================================
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EXAMPLE FILES
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-------------
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rest-server-example.c: A RESTful server example showing how to use the REST layer to develop server-side applications (at the moment only CoAP is implemented for the REST Engine).
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coap-client-example.c: A CoAP client that polls the /toggle resource every 10 seconds and cycles through 4 resources on button press (target address is hard-coded).
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PRELIMINARIES
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-------------
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a) For convenience, define the Cooja addresses in /etc/hosts
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aaaa::0212:7401:0001:0101 cooja1
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aaaa::0212:7402:0002:0202 cooja2
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...
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b) Get the Copper CoAP browser from https://addons.mozilla.org/en-US/firefox/addon/copper-270430/
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c) Optional: Save Tmotes as default target
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$ make TARGET=sky savetarget
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COOJA HOWTO
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-----------
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Server only:
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1) $ make TARGET=cooja rest-server-example.csc
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2) Open new terminal
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3) $ make connect-router-cooja
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4) Start Copper and discover resources at coap://cooja2:5683/
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With client:
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1) $ make TARGET=cooja coap-client-server-example.csc
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2) Wait until red LED toggles on mote 2 (server)
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3) Choose "Click button on Sky 3" from the context menu of mote 3 (client) and watch serial output
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TMOTES HOWTO
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Server:
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1) Connect two Tmote Skys (check with $ make TARGET=sky sky-motelist)
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2) $ make TARGET=sky rest-server-example.upload MOTE=2
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3) $ make TARGET=sky login MOTE=2
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4) Press reset button, get address, abort with Ctrl+C:
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Line: "Tentative link-local IPv6 address fe80:0000:0000:0000:____:____:____:____"
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5) $ cd ../ipv6/rpl-border-router/
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6) $ make TARGET=sky border-router.upload MOTE=1
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7) $ make connect-router
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For a BR tty other than USB0: $ make connect-router-port PORT=X
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8) Start Copper and discover resources at coap://[aaaa::____:____:____:____]:5683/
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Add a client:
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1) Change the hard-coded server address in coap-client-example.c to aaaa::____:____:____:____
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2) Connect a third Tmote Sky
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3) $ make TARGET=sky coap-client-example.upload MOTE=3
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DETAILS
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-------
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The Erbium CoAP currently implements draft 07.
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Central features are commented in rest-server-example.c.
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In general, apps/er-coap-07 supports:
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* All CoAP-07 header options
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* CON Retransmissions (note COAP_MAX_OPEN_TRANSACTIONS)
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* Blockwise Transfers (note REST_MAX_CHUNK_SIZE)
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* Separate Responses (see rest_set_pre_handler() and coap_separate_handler())
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* Resource discovery
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* Observing Resources (see EVENT_ and PRERIODIC_RESOURCE, note COAP_MAX_OBSERVERS)
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TODOs
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-----
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* Blockwise uploads (for POST/PUT payload)
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* Multiple If-Match ETags
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* (Message deduplication)
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