I have managed to successfully run a 25-node multi-hop network using Boomerang 2.0.4 from the TinyOS CVS. One thing to make sure of is that you patch "NetSyncM.nc" as per this page: http://docs.tinyos.net/index.php/Boomerang_Fixes Or just download from this link: http://sing.stanford.edu/klueska/tos_wiki_files/NetSyncM.nc