78 lines
4.2 KiB
Text
78 lines
4.2 KiB
Text
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Open a terminal and go to "<CONTIKI_HOME>/examples/rest-example/" directory.
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MAIN EXAMPLE:
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rest-server-example.c : A RESTful server example showing how to use the REST layer to develop server-side applications (possible to run it over either COAP or HTTP)
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To use COAP as the underlying application protocol, one 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 RESOURCE macros in the code).
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Each resource has a handler function which is called by the REST layer to serve the request.
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(i.e. "helloworld" resource has a handler function named "helloworld_handler" which is called when a web service request is received for "helloworld" resource.)
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To run REST examples in COOJA under Linux
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--------------------------------------------
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Accessing the server from outside:
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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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After loading the cooja file, open another another terminal pointing to the same directory and connect to the COOJA simulation using tunslip6:
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>make connect-router-cooja
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Now, you need to use a COAP or HTTP client to interact with the COOJA nodes running REST code.
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In this setting, two servers are available:
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IP addresses are aaaa::0212:7402:0002:0202 and aaaa::0212:7403:0003:0303. COAP uses 61616, whereas HTTP uses 8080 port in default configuration.
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First, ping 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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You can use curl as an http client to interact with the COOJA motes running 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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You should run a COAP client on your computer. You can use the URLs and methods provided above in HTTP examples to test the COAP Server.
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Accessing the server inside the sensor network:
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(Note: Provided only for COAP implementation)
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Start COOJA and load the simulation "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 COAP) (IP:aaaa::0212:7401:0001:0101)
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in one node and coap-client-example.c as the client (IP: aaaa::0212:7402:0002:0202) in another node.
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Client 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 get a "region text is full" error.
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Right now, REST+HTTP example uses (Contiki + ContikiMAC + uIPv6 + RPL + HTTP Server + REST Layer) which does not fit in Tmote Sky memory.
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To save same code space and make the example fit, you can define static routes rather than using RPL or use nullrdc rather than ContikiMAC.
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To run REST server on real nodes under Linux
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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, reboot them and note their IP addresses.
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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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5. Remaining parts are the same with the COOJA example. (i.e. if it is a COAP Server, it is available at <NODE_IP_ADDR>:61616)
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ToDo
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*Better option handling needed - ex: critical options are not differentiated for now. Need to add support for some such as Tokens.
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*Reilable message sending is missing. i.e. client example should resend request in case ACK does not arrive. Same for server pushing (in case of 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 with Contiki.
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*COAP-specific Method Codes
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