release 1.2.0

• Release date: 10/09/2011

• Download from https://github.com/openwsn-berkeley/openwsn-fw/tree/RB-1.2.

CoAP (Constrained Application Protocol) is the "HTTP for motes" being finalized by the IETF CORE working group. In an OpenWSN network, every mote is now both a CoAP client and a CoAP server:

• since a mote is a CoAP server, you can interact with it from any computer on the Internet, using a regular web browser (check out Copper for Firefox).

• since a mote is a CoAP client, it can interact with an CoAP-enable server:

  • that server can be a data server on the Internet, to which a mote publishes data;

  • that server can be a query server on the Internet; think about a sprinkler querying weather.com to figure out whether it should turn on today;

  • that server can be a different mote in the network; think about a light asking the presence detector whether there is still someone in the room.

The OpenWSN implementation covers the following Internet drafts:

• draft-ietf-core-coap-07

• draft-ietf-core-link-format-07

• draft-shelby-core-resource-directory-01

Details about the new OpenWSN functionalities:

• CoAP resource directory registration

  • after connecting to the network, a mote registers its resources to a CoAP resource directory (RD);

  • the RD used in the release is http://interop.ipso\-alliance.org:8000/ ;

  • the host is set to openwsn followed by the last byte of the mote's EUI64;

  • the mote refreshes its registration every 5 min;

  • you can force a mote to re-register immediately by sending a CoAP POST command to resource /reg.

• CoAP GET

  • get a list of available resources by sending a CoAP GET command on the resource /.well-known/core

  • access the current value of a sensor by browsing to its resource. Supported resources are:

    • /led returns 1  or 0  (LED);

    • /t returns the raw 16-bit ADC measurement from the temperature sensor;

    • /xl1 returns the raw 16-bit ADC measurement from the sensitive accelerometer (X axis, Y axis, Z axis, filtered Z axis);

    • /info returns the version of the stack running, the board, microcontroller and radio models.

• CoAP PUT

  • switch the mote's LED on/off by sending a CoAP PUT to /led containing '1'  or '0' .

• CoAP sensor data publishing

  • all sensors can publish data to a data server;

  • the data server used in the release is http://motes.eecs.berkeley.edu/data/;

  • you can turn on/off any sensor by sending a POST command to that resource containing a '1' (start publishing) or a '0' (stop publishing);

  • by default, only the temperature sensor is publishing every 60 s.