source: ResearchApps/PHY/WARPLAB/WARPLab_v06_1/M_Code_Reference/warplab_writeSMWO.m

function pktNoTx = warplab_writeSMWO(udpSock, SMWO_id, TxData)

pktNoTx = 1;

if(length(TxData) > 2^14)
    disp('ERROR: TxData must contain 16384 (2^14) samples maximum!');
    return;
end

maxPayloadBytesPerPkt = 1024;

TxData_I_fi = int16(real(TxData)*2^15);
TxData_Q_fi = int16(imag(TxData)*2^15);

TxPktData = 2^16.*int32(TxData_I_fi) + int32(typecast(TxData_Q_fi,'uint16'));

%length(TxPktData) is the number of samples, each of which is a 32-bit value
%We'll send UDP packets with payloads of 1024 bytes, or 256 samples
%This results in a maximum of 64 UDP packets to download a full TxData

numPkts = ceil(length(TxPktData)*4/maxPayloadBytesPerPkt);

for n = 0:numPkts-1
    indexStart = ((n*maxPayloadBytesPerPkt/4)+1);
    indexEnd = min(length(TxPktData),((n+1)*maxPayloadBytesPerPkt/4));
    dataToSendTx = [pktNoTx SMWO_id indexStart-1 TxPktData(indexStart:indexEnd)];
    datarec = warplab_pktSend(udpSock, dataToSendTx);

    pktNoTx = pktNoTx+1;
end