138 lines
5.6 KiB
Markdown
138 lines
5.6 KiB
Markdown
REST example
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============
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Open a terminal and go to "<CONTIKI_HOME>/examples/rest-example/" directory.
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MAIN EXAMPLE: rest-server-example.c : A RESTful server example showing how to
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use the REST layer to develop server-side applications (possible to run it over
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either COAP or HTTP) To use COAP as the underlying application protocol, one
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should define WITH_COAP = 1 in rest-example/Makefile. Otherwise, HTTP is used.
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Look at the source code to see which resources are available. (check the
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RESOURCE macros in the code). Each resource has a handler function which is
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called by the REST layer to serve the request. (i.e. "helloworld" resource has
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a handler function named "helloworld_handler" which is called when a web
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service request is received for "helloworld" resource.)
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To run REST examples in COOJA on Linux
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--------------------------------------------
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Accessing the server from outside:
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1. Start COOJA and load the simulation "rest-server-example.csc" by the following command.
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make TARGET=cooja rest-server-example.csc
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2. After loading the COOJA file, open another another terminal pointing to the
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same directory and connect to the COOJA simulation using tunslip6:
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make connect-router-cooja
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3. You need to use a COAP or HTTP client to interact with the COOJA nodes
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running REST code. In this setting, two servers are available: IP addresses
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are aaaa::0212:7402:0002:0202 and aaaa::0212:7403:0003:0303. COAP uses
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61616, whereas HTTP uses 8080 port in default configuration. First, ping
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the COOJA nodes to test the connectivity.
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ping6 aaaa::0212:7402:0002:0202
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ping6 aaaa::0212:7403:0003:0303
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HTTP Examples
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-------------
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You can use curl as an http client to interact with the COOJA motes running
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REST code.
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curl -H "User-Agent: curl" aaaa::0212:7402:0002:0202:8080/helloworld #get helloworld plain text
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curl -H "User-Agent: curl" aaaa::0212:7402:0002:0202:8080/led?color=green -d mode=off -i #turn off the green led
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curl -H "User-Agent: curl" aaaa::0212:7402:0002:0202:8080/.well-known/core -i
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curl -X POST -H "User-Agent: curl" aaaa::0212:7402:0002:0202:8080/helloworld #method not allowed
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COAP Examples
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-------------
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You should run a COAP client on your computer. You can use the URLs and methods
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provided above in HTTP examples to test the COAP Server. For example, Matthias
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Kovatsch has developed a CoAP Firefox plug-in which is accessible via
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[http://people.inf.ethz.ch/mkovatsc/#pro](http://people.inf.ethz.ch/mkovatsc/#pro)
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Accessing the server inside the sensor network: (Note: Provided only for COAP
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implementation) Start COOJA and load the simulation
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"coap-client-server-example.csc" by the following command.
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make TARGET=cooja coap-client-server-example.csc
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coap-client-server-example.csc : Runs rest-server-example.c as the server (over
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COAP) (IP:aaaa::0212:7401:0001:0101) in one node and coap-client-example.c as
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the client (IP: aaaa::0212:7402:0002:0202) in another node. Client
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periodically accesses resources of server and prints the payload.
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Note: If the generated binary is bigger than the MOTE code size, then you will
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get a "region text is full" error. Right now, REST+HTTP example uses (Contiki
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& ContikiMAC & uIPv6 & RPL & HTTP Server & REST Layer) which does not fit in
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Tmote Sky memory. To save same code space and make the example fit, you can
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define static routes rather than using RPL or use nullrdc rather than
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ContikiMAC. If border router does not fit, then first try to update the
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Makefile of border router in <CONTIKI_HOME>/examples/ipv6/rpl-border-router by
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setting WITH_WEBSERVER=0.
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To run REST server on real nodes (i.e. tmote sky)
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--------------------------------------------
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1. Program the nodes with the rest-server-example
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make TARGET=sky rest-server-example.upload
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2. Disconnect the nodes and program one node with the RPL border router
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cd ../ipv6/rpl-border-router && make TARGET=sky border-router.upload
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3. Connect to the border router using tunslip6:
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make connect-router
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4. Reconnect the motes, open new terminal for each mote and run the following
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command to note their IP addresses (after running the command reset the
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corresponding mote to get IP address printed)
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make login TARGET=sky MOTE=2 #Shows the prints for first mote
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make login TARGET=sky MOTE=3 #For second mote and so on.
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5. Test the connectivity by pinging them.
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ping6 <IPv6 Address of the MOTE>
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6. Remaining parts are the same with the COOJA example. (i.e. if it is a COAP
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Server, it's available at <NODE_IP_ADDR>:61616)
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To run REST server with minimal-net on Linux
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--------------------------------------------
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1. Compile with minimal-net setting.
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make rest-server-example TARGET=minimal-net
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2. Run the generated executable with sudo and note the IP address of the server
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which will be printed right after.
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sudo ./rest-server-example.minimal-net
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3. How to access and test the server is same with the other settings. (i.e. if
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it is a COAP Server, it's available at <IP_ADDRESS_FROM_STEP_2>:61616 and if
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it's a HTTP Server it is available at <IP_ADDRESS_FROM_STEP_2>:8080)
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TODO
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----
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- Better option handling needed - ex: critical options are not differentiated
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for now. Need to add support for some such as Tokens. Also, C/E difference
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should be added.
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- Reilable message sending is missing. i.e. client example should resend
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request in case ACK does not arrive. Same for server pushing (in case of
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subscriptions)
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- Add Block transfer example
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- Add Subscription example
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- Add an Android/Java COAP Client to Contikiprojects to be able to interact
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with Contiki.
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- COAP-specific Method Codes
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