Simulink Model Memory Leaks

My model seems to leak memory, and of course becomes painful to use when it gets to the stage that doing so has to involve swap. I can see the memory usage gradually increase from arounf 3G to 8G over a day in the task manager when I am running the model.

I suspect these routines I wrote for sending variable length UDP messages. Previously I was using UDP Send blocks which do not appear to support variable lenght messages.

This routine is invoked every simulation time step.

I have put comments in where I would like to call "clear" to be sure to free the memory.

Is there a memory leak here, and how do I fix it, either by clearing the memeory or avoiding the allocations?

function [data,status]=receive_message  
    coder.extrinsic('evalin');
    coder.extrinsic('getfield');
    coder.extrinsic('fread');

    n=zeros(1,1,'double');
    data=zeros(1,350,'uint32');

    BMS_link_1=evalin('base', 'MyUDPObject');
    n=getfield(MyUDPObject,'BytesAvailable');

    if n>0 
        status=1;
        tmp=fread(MyUDPObject,1,'int32');
        
        w=uint32(0);
        w=uint32(numel(tmp));
        %fprintf('Msg_ID: %i   Len: %i\n',tmp(1),w);
        for i=uint32(1):w
            data(i)=tmp(i);
        end
        
        %clear tmp; % cannot be used, clear is not supported for code generation.
        %clear w;
    else
        status=0;
    end
    %clear n;
end