configureCallback

Create a callback function called readFcn and save it as a .m file in the current working directory.

function readFcn(src,~)
message = readline(src);
disp(message)
end

Create a TCP/IP server that listens for connections at localhost and port 4000.

server = tcpserver("localhost",4000)

server = 
  TCPServer with properties:

        ServerAddress: "127.0.0.1"
           ServerPort: 4000
            Connected: 0
        ClientAddress: ""
           ClientPort: []
    NumBytesAvailable: 0

  Show all properties, functions

Create a TCP/IP client to connect to your server object using tcpclient. You must specify the same IP address and port number you use to create server.

client = tcpclient("localhost",4000)

client = 
  tcpclient with properties:

              Address: 'localhost'
                 Port: 4000
    NumBytesAvailable: 0

  Show all properties, functions

Set the callback function readFcn to trigger when a terminator is available to be read in the server. The callback function readFcn reads and displays the message sent from the connected client.

configureCallback(server,"terminator",@readFcn)

View the properties to confirm the change.

server.BytesAvailableFcnMode

ans = 
"terminator"

server.BytesAvailableFcn

ans = function_handle with value:
    @readFcn

Write a string of ASCII data to the TCP/IP client. Since the client is connected to the server, this data is available in the server. When the server receives the data with a terminator from the client, server triggers its callback function, which displays the data.

writeline(client,"Hello, world!")

Hello, world!

Turn the callback off.

configureCallback(server,"off")

Verify that the callback is off.

server.BytesAvailableFcnMode

ans = 
"off"

Create a callback function called readByteFcn and save it as a .m file in the current working directory.

function readByteFcn(src,~)
data = read(src,src.NumBytesAvailable);
disp(data)
end

Create a TCP/IP server that listens for connections at localhost and port 4000.

server = tcpserver("localhost",4000)

server = 
  TCPServer with properties:

        ServerAddress: "127.0.0.1"
           ServerPort: 4000
            Connected: 0
        ClientAddress: ""
           ClientPort: []
    NumBytesAvailable: 0

  Show all properties, functions

Create a TCP/IP client to connect to your server object using tcpclient. You must specify the same IP address and port number you use to create server.

client = tcpclient("localhost",4000)

client = 
  tcpclient with properties:

              Address: 'localhost'
                 Port: 4000
    NumBytesAvailable: 0

  Show all properties, functions

Set the callback function readByteFcn to trigger when five bytes of new data are available to be read in the server. The callback function readByteFcn reads and displays all the data sent from the connected client.

configureCallback(server,"byte",5,@readByteFcn)

View the properties to confirm the change.

server.BytesAvailableFcnMode

ans = 
"byte"

server.BytesAvailableFcnCount

ans = 5

server.BytesAvailableFcn

ans = function_handle with value:
    @readByteFcn

Write five bytes of data to the TCP/IP client. Since the client is connected to the server, this data is available in the server. When the server receives the five bytes of data from the client, server triggers its callback function, which displays the data.

write(client,1:5,"uint8")

1 2 3 4 5

Turn the callback off.

configureCallback(server,"off")

Verify that the callback is off.

server.BytesAvailableFcnMode

ans = 
"off"