Receive data from COM

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lafe on 22 Nov 2016
Edited: lafe on 23 Nov 2016
I am trying to make a code that will read data from a COM (in my case TCP/IP connection) every time that the data appears without using an infinite loop or without determining how many times the loop will happen. I’m expecting to receive packets with deferent size. Till now I have only accomplice to receive data with this code:
while 1
len = s1.BytesAvailable; % wait to receive a new character
while len == 0
len = s1.BytesAvailable;
in = fread(s1,1);
fprintf('\n 1character received %d',in)
any help please?

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