166 lines
5.0 KiB
Markdown
166 lines
5.0 KiB
Markdown
A Quick Introduction to the Erbium (Er) REST Engine
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===================================================
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EXAMPLE FILES
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-------------
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- er-example-server.c: A RESTful server example showing how to use the REST
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layer to develop server-side applications (at the moment only CoAP is
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implemented for the REST Engine).
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- er-example-client.c: A CoAP client that polls the /actuators/toggle resource
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every 10 seconds and cycles through 4 resources on button press (target
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address is hard-coded).
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- er-plugtest-server.c: The server used for draft compliance testing at ETSI
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IoT CoAP Plugtest in Paris, France, March 2012 (configured for minimal-net).
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PRELIMINARIES
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-------------
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- Make sure rpl-border-router has the same stack and fits into mote memory:
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You can disable RDC in border-router project-conf.h (not really required as BR keeps radio turned on).
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#undef NETSTACK_CONF_RDC
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#define NETSTACK_CONF_RDC nullrdc_driver
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- 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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- Get the Copper (Cu) CoAP user-agent from
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[https://addons.mozilla.org/en-US/firefox/addon/copper-270430](https://addons.mozilla.org/en-US/firefox/addon/copper-270430)
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- Optional: Save your target 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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make TARGET=cooja server-only.csc
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Open new terminal
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make connect-router-cooja
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- Start Copper and discover resources at coap://cooja2:5683/
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- Choose "Click button on Sky 2" from the context menu of mote 2 (server) after
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requesting /test/separate
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- Do the same when observing /test/event
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###With client:
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make TARGET=cooja server-client.csc
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Open new terminal
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make connect-router-cooja
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- Wait until red LED toggles on mote 2 (server)
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- Choose "Click button on Sky 3" from the context menu of mote 3 (client) and
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watch serial output
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TMOTES HOWTO
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------------
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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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make TARGET=sky er-example-server.upload MOTE=2
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make TARGET=sky login MOTE=2
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2. 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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cd ../ipv6/rpl-border-router/
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make TARGET=sky border-router.upload MOTE=1
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make connect-router
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For a BR tty other than USB0:
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make connect-router-port PORT=X
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3. Start Copper and discover resources at:
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coap://[aaaa::____:____:____:____]:5683/
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### Add a client:
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1. Change the hard-coded server address in er-example-client.c to aaaa::____:____:____:____
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2. Connect a third Tmote Sky
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make TARGET=sky er-example-client.upload MOTE=3
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MINIMAL-NET HOWTO
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-----------------
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With the target minimal-net you can test your CoAP applications without
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constraints, i.e., with large buffers, debug output, memory protection, etc.
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The er-plugtest-server is thought for the minimal-net platform, as it requires
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an 1280-byte IP buffer and 1024-byte blocks.
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make TARGET=minimal-net er-plugtest-server
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sudo ./er-plugtest-server.minimal-net
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Open new terminal
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make connect-minimal
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- Start Copper and discover resources at coap://[fdfd::ff:fe00:10]:5683/
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- You can enable the ETSI Plugtest menu in Copper's preferences
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Under Windows/Cygwin, WPCAP might need a patch in
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<cygwin>\usr\include\w32api\in6addr.h:
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21,23c21
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< #ifdef __INSIDE_CYGWIN__
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< uint32_t __s6_addr32[4];
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< #endif
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---
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> u_int __s6_addr32[4];
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36d33
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< #ifdef __INSIDE_CYGWIN__
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39d35
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< #endif
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DETAILS
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-------
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Erbium currently implements draft 13. Central features are commented in
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er-example-server.c. In general, apps/er-coap-13 supports:
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- All draft 13 header options
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- CON Retransmissions (note COAP_MAX_OPEN_TRANSACTIONS)
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- Blockwise Transfers (note REST_MAX_CHUNK_SIZE, see er-plugtest-server.c for
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Block1 uploads)
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- Separate Responses (no rest_set_pre_handler() required anymore, note
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coap_separate_accept(), _reject(), and _resume())
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- Resource Discovery
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- Observing Resources (see EVENT_ and PRERIODIC_RESOURCE, note
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COAP_MAX_OBSERVERS)
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REST IMPLEMENTATIONS
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--------------------
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The Makefile uses WITH_COAP to configure different implementations for the
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Erbium (Er) REST Engine.
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- WITH_COAP=13 uses Erbium CoAP 13 apps/er-coap-13/. The default port for
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coap-13 is 5683.
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- WITH_COAP=12 uses Erbium CoAP 12 apps/er-coap-12/. The default port for
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coap-12 is 5683.
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- WITH_COAP=7 uses Erbium CoAP 08 apps/er-coap-07/. The default port for
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coap-07/-08 is 5683.
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- WITH_COAP=3 uses Erbium CoAP 03 apps/er-coap-03/. The default port for
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coap-03 is 61616. er-coap-03 produces some warnings, as it not fully
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maintained anymore.
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- WITH_COAP=0 is a stub to link an Erbium HTTP engine that uses the same
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resource abstraction (REST.x() functions and RESOURCE macros.
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TODOs
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-----
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- Dedicated Observe buffers
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- Optimize message struct variable access (directly access struct without copying)
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- Observe client
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- Multiple If-Match ETags
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- (Message deduplication)
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