I assume that there is a very lightweight sensor node. The node wakes up on 
every 1 min and measures the temperature and broadcasts measured value and 
sleep again. This node does not have any memory and does not receive any 
message from other nodes.
I want to bring coap message to this node. I know that OBSERVE draft in coap is 
one candidate. However, it require that the sensor node (coap server) should 
have availity to receive coap client's request(register) and the memory to 
remember token from request and client address. But I do not want to make the 
lightweight sensor node complex.
For this kind of node, Do we need make a special mechnism?  i.e., we define 
broadcast or preconfigured response without request. The response may have own 
uri to describe what data is. 

- Softgear Ko (Mobile)
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