discovery functie van persistent IP (i know statefull)+commentaar en nu wel gitignore toegevoegd.

.gitignore

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+##---------------------------------------------------
+## Remove autosaves generated by the Matlab editor
+## We have git for backups!
+##---------------------------------------------------
+
+# Windows default autosave extension
+*.asv
+
+# OSX / *nix default autosave extension
+*.m~
+
+# Compiled MEX binaries (all platforms)
+*.mex*
+
+# Simulink Code Generation
+slprj/
+
+# Session info
+octave-workspace

Equipment/prologix_discovery.m

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+function ipaddress = prologix_discovery()
+%% PROLOGIX_DISCOVERY Find your prologix GPIB device.
+%   ipaddress = PROLOGIX_DISCOVERY() finds prologix on your 
+%   local network. When your prologix device is detected
+%   string with ip address is returned. 
+%   
+%   Function uses persistent ipaddress: when ipaddress is 
+%   changed use CLEAR ALL to find the current ipaddress.
+%   See also CLEAR
+
+%% setup correct variables.
+% if location of prologix is known: just return stored ip address
+persistent stored_ipaddress;
+if ~isempty(stored_ipaddress)
+    ipaddress = stored_ipaddress;
+    return
+end
+local_port = randi([49152 65535]);
+remote_port = 3040;
+
+%% setup dsp to send and recieve udp packets.
+hudpr = dsp.UDPReceiver('LocalIPPort',local_port);
+hudps = dsp.UDPSender('RemoteIPAddress','255.255.255.255','RemoteIPPort',remote_port,'LocalIPPortSource','Property','LocalIPPort',local_port);
+% start recieving udp packets
+setup(hudpr);
+
+%% Discover prologix.
+% magic string to request ipaddress from prologix: ['5a' '00' '5b' 'db' 'ff' 'ff' 'ff' 'ff' 'ff' 'ff' '00' '00']
+magic_msg = uint8([90 0 91 219 255 255 255 255 255 255 00 00]);
+% Sending packet.
+step(hudps,magic_msg);
+% Recieving packet or resend.
+for i = 1:100
+    pause(0.1);
+    msg = step(hudpr);
+    if numel(msg)>0
+        break;
+    elseif mod(i,10) == 0
+        %waiting dot and resending of string
+        fprintf('.')
+        step(hudps,magic_msg);
+    end
+end
+if isempty(msg)
+    error('No prologix found on network');
+end
+%ipaddress string is extracted from recieved UDP message. array position 21
+%till 24.
+ipaddress = num2str(msg(21:24)','%d.%d.%d.%d');
+stored_ipaddress = ipaddress;
+%% releasing connection.
+release(hudps);
+release(hudpr);