uhd

static const size_t CTRL_RECV_RETRIES = 3;

//custom timeout error for retry logic to catch/retry

struct timeout_error : uhd::runtime_error

{

    timeout_error(const std::string &what):

        uhd::runtime_error(what)

    {

        //NOP

    }

};

        for (size_t i = 0; i < CTRL_RECV_RETRIES; i++){

            try{

                return ctrl_send_and_recv_internal(out_data, lo, hi, CTRL_RECV_TIMEOUT/CTRL_RECV_RETRIES);

            }

            catch(const timeout_error &e){

                UHD_MSG(error)

                    << "Control packet attempt " << i

                    << ", sequence number " << _ctrl_seq_num

                    << ":\n" << e.what() << std::endl;

            }

        }

        throw uhd::runtime_error("link dead: timeout waiting for control packet ACK");

    }

    usrp2_ctrl_data_t ctrl_send_and_recv_internal(

        const usrp2_ctrl_data_t &out_data,

        boost::uint32_t lo, boost::uint32_t hi,

        const double timeout

    ){

            size_t len = _ctrl_transport->recv(boost::asio::buffer(usrp2_ctrl_data_in_mem), timeout);

        throw timeout_error("no control response, possible packet loss");