84 lines
3.3 KiB
Plaintext
84 lines
3.3 KiB
Plaintext
This is the new example for the Erbium REST Engine
|
|
==================================================
|
|
|
|
EXAMPLE FILES
|
|
-------------
|
|
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).
|
|
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).
|
|
|
|
PRELIMINARIES
|
|
-------------
|
|
a) Make sure rpl-border-router has the same stack and fits into mote memory, e.g.:
|
|
Disable RDC in border-router project-conf.h
|
|
#undef NETSTACK_CONF_RDC
|
|
#define NETSTACK_CONF_RDC nullrdc_driver
|
|
b) For convenience, define the Cooja addresses in /etc/hosts
|
|
aaaa::0212:7401:0001:0101 cooja1
|
|
aaaa::0212:7402:0002:0202 cooja2
|
|
...
|
|
c) Get the Copper CoAP browser from https://addons.mozilla.org/en-US/firefox/addon/copper-270430/
|
|
d) Optional: Save Tmotes as default target
|
|
$ make TARGET=sky savetarget
|
|
|
|
COOJA HOWTO
|
|
-----------
|
|
Server only:
|
|
1) $ make TARGET=cooja rest-server-example.csc
|
|
2) Open new terminal
|
|
3) $ make connect-router-cooja
|
|
4) Start Copper and discover resources at coap://cooja2:5683/
|
|
|
|
With client:
|
|
1) $ make TARGET=cooja coap-client-server-example.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
|
|
|
|
TMOTES HOWTO
|
|
------------
|
|
Server:
|
|
1) Connect two Tmote Skys (check with $ make TARGET=sky sky-motelist)
|
|
2) $ make TARGET=sky rest-server-example.upload MOTE=2
|
|
3) $ make TARGET=sky login MOTE=2
|
|
4) Press reset button, get address, abort with Ctrl+C:
|
|
Line: "Tentative link-local IPv6 address fe80:0000:0000:0000:____:____:____:____"
|
|
5) $ cd ../ipv6/rpl-border-router/
|
|
6) $ make TARGET=sky border-router.upload MOTE=1
|
|
7) $ make connect-router
|
|
For a BR tty other than USB0: $ make connect-router-port PORT=X
|
|
8) Start Copper and discover resources at coap://[aaaa::____:____:____:____]:5683/
|
|
|
|
Add a client:
|
|
1) Change the hard-coded server address in coap-client-example.c to aaaa::____:____:____:____
|
|
2) Connect a third Tmote Sky
|
|
3) $ make TARGET=sky coap-client-example.upload MOTE=3
|
|
|
|
DETAILS
|
|
-------
|
|
The Erbium CoAP currently implements draft 08.
|
|
Central features are commented in rest-server-example.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)
|
|
* Separate Responses (see rest_set_pre_handler() and coap_separate_handler())
|
|
* 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 REST Engine.
|
|
* WITH_COAP=7 uses Erbium CoAP 07 apps/er-coap-07/.
|
|
The default port for coap-07 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
|
|
-----
|
|
* Blockwise uploads (for POST/PUT payload)
|
|
* Multiple If-Match ETags
|
|
* (Message deduplication)
|