// NewBroadcastProtocol returns a new Broadcast protocol func NewBroadcastProtocol(n *onet.TreeNodeInstance) (onet.ProtocolInstance, error) { b := &Broadcast{ TreeNodeInstance: n, tnIndex: -1, } for i, tn := range n.Tree().List() { if tn.ID == n.TreeNode().ID { b.tnIndex = i } } if b.tnIndex == -1 { return nil, errors.New("Didn't find my TreeNode in the Tree") } err := n.RegisterHandler(b.handleContactNodes) if err != nil { return nil, err } err = n.RegisterHandler(b.handleDone) if err != nil { return nil, err } return b, nil }