[app designer] Create callback function when a variable changed.

Hello I am here to find help

I want to make a simple app which containing a Lamp in app designer.

That Lamp turns green when this app connected with other app by TCP/IP.

And when TCP/IP connection is disconnected, the Lamp turns to be red.

I think it is possible by some kind of callback function called when TCP/IP connection check value is changed.

How can I make it?

[Geoff Hayes]

@Jae-Hee Park - how are you creating the TCP/IP connection to another app? How does your App know about the other?

[Jae-Hee Park]

App1 create tcp/ip server by matlab functions like this

t = tcpserver(address,port);            

and App2 connect like this

client = tcpclient(address,port); 

[Geoff Hayes]

@Jae-Hee Park - you might be able to use the ErrorOccurredFcn callback to capture if there is an error and from that you might be able to assume that the connection is lost. I couldn't see a function that might check the state of the connection. There might be one, but it wasn't obvious to me.

[Jae-Hee Park]

@Geoff Hayes how about this way? "ConnectionChangedFcn"

Answer 1

[Jae-Hee Park]

Use "ConnectionChangedFcn"