Getting data from 4 channels ADC and from socket

I have ADC data from socket, 4 channels. I would like to read the data from the sockets based on whichSignal variable.

What I read is the header which is 1 byte, then I need to read whichSignal variable. But currently, I just get the header correct and the debug break point is triggered, but it never goes into whichSignal == 0, however the followed header byte is 0.

The head that's sent from the microcontroller is 0x35

here is a snippet

    function localReadAndPlot(ropaRadarReceive,~,figureHandle,bytesToRead)
    header = fread(ropaRadarReceive,1);
    header = uint8(header);
    dataI1=[];

    r = getGlobalx;

    fileData = fread(ropaRadarReceive,bytesToRead);

    fprintf(r,' %d \r\n',fileData);

    if ( isequal(header(1), 53) )

        whichSignal = fread(ropaRadarReceive,1);

        if(isequal(whichSignal(1),0))

             dataI1= fread(ropaRadarReceive, bytesToRead);
                disp(dataI1);

        elseif(isequal(whichSignal(1), 1))

        elseif(isequal(whichSignal(1), 2))

        elseif(isequal(whichSignal(1), 3))
        end            
    end