Merge pull request #6 from mape1991/dev_server_julien

dev server julien pull request
Merge pull request #7 from mape1991/dev_server

Dev server
new udp service, now using two sockets
UDP: new check of socket binding
UDP: added constants for clarity
Merge pull request #8 from mape1991/dev_server_aymeric

Dev server aymeric
Merge pull request #9 from mape1991/dev_server

update udp from aymeric branch