NetworkEnvironment Improvements

Improved the id generation, now based on group name and mac address to
guarantee that always the same id is generated.

Minimized the packed loss issue. Seems to be caused by network
collisions in wifi networks, because this issue only appears on
wireless networks with high traffic. Optimized ist trough repeating the
network broadcasts with random gaps from 0ms up to 15ms.

The test app now includes a reload button and shows all available
clients.
Additions to 'NetworkEnvironment Improvements'