func (br *AncestorReceiver) StartGet() {
    // create message data
    req := &types.GetAncestorRequest{Hashes: br.hashes}
    mo := br.peer.MF().NewMsgRequestOrderWithReceiver(br.ReceiveResp, p2pcommon.GetAncestorRequest, req)
    br.requestID = mo.GetMsgID()