If coap-client(e.g. RPL BR) wants to get notifications from
coap-server(RPL-node) about parent status, client has to register
observer for notifications.
RPL node application modified to toggle the LED. Do not maintain any
ON/OFF states. Also removed Sparrow (contiki border router) related
patch.
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
Ravi kumar Veeramally