How to decode a UDP packet without byte unpack

I'm using simulink udp_receive to get some data. the data is a mix of different data types. I can't use the byte unpack block because it's not supported for code generation. i made a matlab function instead to read this. I'm using something like

function [data1,data2, data3] = fcn(u)

data1 = u(1,1);

data2 = u(2,1);

data3 = u(3:10,1);

end

to read the the specific byte wich works for data1 and data2 because they are 'uint8'. but i can't read data that are double or float in data3. using (3:10) read all the bytes but doesn't assume them as one variable.

Any suggestions?

Answer 1

[Jonas]

You can reassemble those 8 bytes into a 64 byte double by applying a bitshift to each byte to its correct position, using a bitor on all outputs of the bitshifts and then typecast the resulting uint64 to double.

Same can be done for the 4 bytes of a 'single' or float32.

It looks something like this: