"test_12" example:
---------------

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

 fusion options : -f node_a -t1 pinger -t2 ping_me

---------------
tests :
* fusion of connected periodic threads
* same priorities [to change]