76 lines
3.1 KiB
Text
76 lines
3.1 KiB
Text
A Quick Introduction to the Erbium (Er) REST Engine
|
|
===================================================
|
|
Compile the Example
|
|
-------------------
|
|
./run.sh
|
|
|
|
OSD-Merkur Board
|
|
----------------------
|
|
write the images to the OSD-Merkur Board:
|
|
|
|
./flash.sh
|
|
|
|
EXAMPLE FILES
|
|
-------------
|
|
er-example-server.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).
|
|
er-example-client.c: A CoAP client that polls the /actuators/toggle resource every 10 seconds and cycles through 4 resources on button press (target address is hard-coded).
|
|
er-plugtest-server.c: The server used for draft compliance testing at ETSI IoT CoAP Plugtest in Paris, France, March 2012 (configured for minimal-net).
|
|
|
|
PRELIMINARIES
|
|
-------------
|
|
- Make sure rpl-border-router has the same stack and fits into mote memory:
|
|
You can disable RDC in border-router project-conf.h (not really required as BR keeps radio turned on).
|
|
#undef NETSTACK_CONF_RDC
|
|
#define NETSTACK_CONF_RDC nullrdc_driver
|
|
- For convenience, define the Cooja addresses in /etc/hosts
|
|
aaaa::0212:7401:0001:0101 cooja1
|
|
aaaa::0212:7402:0002:0202 cooja2
|
|
...
|
|
- Get the Copper (Cu) CoAP user-agent from https://addons.mozilla.org/en-US/firefox/addon/copper-270430/
|
|
- Optional: Save your target as default target
|
|
$ make TARGET=sky savetarget
|
|
|
|
COOJA HOWTO
|
|
-----------
|
|
Server only:
|
|
1) $ make TARGET=cooja server-only.csc
|
|
2) Open new terminal
|
|
3) $ make connect-router-cooja
|
|
4) Start Copper and discover resources at coap://cooja2:5683/
|
|
- Choose "Click button on Sky 2" from the context menu of mote 2 (server) after requesting /test/separate
|
|
- Do the same when observing /test/event
|
|
|
|
With client:
|
|
1) $ make TARGET=cooja server-client.csc
|
|
2) Open new terminal
|
|
3) $ make connect-router-cooja
|
|
4) Wait until red LED toggles on mote 2 (server)
|
|
5) Choose "Click button on Sky 3" from the context menu of mote 3 (client) and watch serial output
|
|
|
|
DETAILS
|
|
-------
|
|
Erbium currently implements draft 08 (name "er-coap-07" stems from last technical draft changes).
|
|
Central features are commented in er-example-server.c.
|
|
In general, apps/er-coap-07 supports:
|
|
* All draft 08 header options
|
|
* CON Retransmissions (note COAP_MAX_OPEN_TRANSACTIONS)
|
|
* Blockwise Transfers (note REST_MAX_CHUNK_SIZE, see er-plugtest-server.c for Block1 uploads)
|
|
* Separate Responses (no rest_set_pre_handler() required anymore, note coap_separate_accept(), _reject(), and _resume())
|
|
* Resource Discovery
|
|
* Observing Resources (see EVENT_ and PRERIODIC_RESOURCE, note COAP_MAX_OBSERVERS)
|
|
|
|
REST IMPLEMENTATIONS
|
|
--------------------
|
|
The Makefile uses WITH_COAP to configure different implementations for the Erbium (Er) REST Engine.
|
|
* WITH_COAP=7 uses Erbium CoAP 08 apps/er-coap-07/.
|
|
The default port for coap-07/-08 is 5683.
|
|
* WITH_COAP=3 uses Erbium CoAP 03 apps/er-coap-03/.
|
|
The default port for coap-03 is 61616.
|
|
er-coap-03 produces some warnings, as it not fully maintained anymore.
|
|
* WITH_COAP=0 is a stub to link an Erbium HTTP engine that uses the same resource abstraction (REST.x() functions and RESOURCE macros.
|
|
|
|
TODOs
|
|
-----
|
|
* Observe client
|
|
* Multiple If-Match ETags
|
|
* (Message deduplication)
|