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Transition Your Code to tcpclient Interface

The tcpip function, its object functions, and its properties are not recommended. Use the tcpclient interface instead.

tcpip Interfacetcpclient InterfaceExample
tcpiptcpclientCreate a TCP/IP Client
fwrite and freadwrite and readWrite and Read
fprintfwritelineRead Terminated String
fscanf, fgetl, and fgetsreadlineRead Terminated String
Read and Parse String Data
querywritereadWrite and Read Back Data
binblockwrite and binblockreadwritebinblock and readbinblockWrite and Read Data with the Binary Block Protocol
flushinput and flushoutputflushFlush Data from Memory
TerminatorconfigureTerminatorSet Terminator
BytesAvailableFcnCount, BytesAvailableFcnMode, BytesAvailableFcn, and BytesAvailableconfigureCallbackSet Up Callback Function
tcpip Propertiestcpclient Properties  

Create a TCP/IP Client

These examples show how to create and clear a TCP/IP client using the recommended functionality.

FunctionalityUse This Instead
t = tcpip("localhost",3030);
fopen(t)
t = tcpclient("localhost",3030);
t = tcpip("127.0.0.1",3030,"NetworkRole","client");
fopen(t)
t = tcpclient("127.0.0.1",3030);
fclose(t)
delete(t)
clear t
clear t

For more information, see tcpclient.

Write and Read

These examples use an echo server to show how to perform a binary write and read, and how to write and read nonterminated string data, using the recommended functionality.

FunctionalityUse This Instead
echotcpip("on",3030)

% t is a tcpip object
fwrite(t,1:5);
data = fread(t,5)
data =

     1
     2
     3
     4
     5
echotcpip("on",3030)

% t is a tcpclient object
write(t,1:5,"uint8")
data = read(t,5)
data =

  1×5 uint8 row vector

   1   2   3   4   5
data = double(data)
data =

     1     2     3     4     5
echotcpip("on",3030)

% t is a tcpip object
fwrite(t,"hello","char")
length = 5;
data = fread(t,length,"char")
data =

   104
   101
   108
   108
   111
data = char(data)'
data =

    'hello'
echotcpip("on",3030)

% t is a tcpclient object
write(t,"hello","string");
length = 5;
data = read(t,length,"string")
data =

    "hello"

For more information, see write or read .

Read Terminated String

These examples show how to write and read terminated string data using the recommended functionality.

FunctionalityUse This Instead
echotcpip("on",3030)

% t is a tcpip object
t.Terminator = "CR";
fprintf(t,"hello")
data = fscanf(t)
data =

    'hello
     '
echotcpip("on",3030)

% t is a tcpclient object
configureTerminator(t,"CR");
writeline(t,"hello","127.0.0.1",3030);
data = readline(t)
a = 

    "hello"
echotcpip("on",3030)

% t is a tcpip object
t.Terminator = "CR";
fprintf(t,"hello")
data = fgetl(t)
data =

    'hello'

fgetl reads until the specified terminator is reached and then discards the terminator.

echotcpip("on",3030)

% t is a tcpip object
t.Terminator = "CR";
fprintf(t,"hello")
data = fgets(t)
data =

    'hello
     '

fgets reads until the specified terminator is reached and then returns the terminator.

For more information, see writeline or readline.

Read and Parse String Data

This example shows how to read and parse string data using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
data = scanstr(t,';')
data =

  3×1 cell array

    {'a'}
    {'b'}
    {'c'}
% t is a tcpclient object
data = readline(t)
data = 

    "a;b;c"
data = strsplit(data,";")
data = 

  1×3 string array

    "a"    "b"    "c"

For more information, see readline.

Write and Read Back Data

This example shows how to write ASCII terminated data and read ASCII terminated data back using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
data = query(t,'ctrlcmd')
data =

    'success'
% t is a tcpclient object
data = writeread(t,"ctrlcmd")
data = 

    "success"

For more information, see writeread.

Write and Read Data with the Binary Block Protocol

This example shows how to write data with the IEEE standard binary block protocol using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
binblockwrite(t,1:5);
data = binblockread(t)
data =

     1
     2
     3
     4
     5
% t is a tcpclient object
writebinblock(t,1:5);
data = readbinblock(t)
data =

     1     2     3     4     5

For more information, see writebinblock or readbinblock.

Flush Data from Memory

These examples show how to flush data from the buffer using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
flushinput(t)
% t is a tcpclient object
flush(t,"input")
% t is a tcpip object
flushoutput(t)
% t is a tcpclient object
flush(t,"output")
% t is a tcpip object
flushinput(t)
flushoutput(t)
% t is a tcpclient object
flush(t)

For more information, see flush.

Set Terminator

These examples show how to set the terminator using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
t.Terminator = "CR/LF";
% t is a tcpclient object
configureTerminator(t,"CR/LF")
% t is a tcpip object
t.Terminator = {"CR/LF" [10]};
% t is a tcpclient object
configureTerminator(t,"CR/LF",10)

For more information, see configureTerminator.

Set Up Callback Function

These examples show how to set up a callback function using the recommended functionality.

FunctionalityUse This Instead
% t is a tcpip object
t.BytesAvailableFcnCount = 5
t.BytesAvailableFcnMode = "byte"
t.BytesAvailableFcn = @mycallback

function mycallback(src,evt)
   data = fread(src,src.BytesAvailableFcnCount);
   disp(evt)
   disp(evt.Data)
end
    Type: 'BytesAvailable'
    Data: [1×1 struct]

    AbsTime: [2019 12 21 16 35 9.7032]
% t is a tcpclient object
configureCallback(t,5,@mycallback);

function mycallback(src,evt)
   data = read(src,src.BytesAvailableFcnCount);
   disp(evt)
end
  ByteAvailableInfo with properties:

    BytesAvailableFcnCount: 5
                   AbsTime: 21-Dec-2019 12:23:01
% t is a tcpip object
t.Terminator = "CR"
t.BytesAvailableFcnMode = "terminator"
t.BytesAvailableFcn = @mycallback

function mycallback(src,evt)
   data = fscanf(src);
   disp(evt)
   disp(evt.Data)
end
    Type: 'BytesAvailable'
    Data: [1×1 struct]

    AbsTime: [2019 12 21 16 35 9.7032]
% t is a tcpclient object
configureCallback(t,"terminator",@mycallback);

function mycallback(src,evt)
   data = readline(src);
   disp(evt)
end
  TerminatorAvailableInfo with properties:

                   AbsTime: 21-Dec-2019 12:23:01

For more information, see configureCallback.

See Also

Related Topics