"test_15" example:
---------------

* Description: two periodic threads send data to two sporadic threads

* One deployement are provided, ping-local deploys one node, the two 
threads are on the same node.

* Compilation: issue "make" in the root directory

* Run: tsim-erc32 node_a

---------------
tests :
* fusion of non-connected periodic and sporadic (-> hybrid)
* threads of different priorities