When receiving data, you have to make sure that you receive it all, split the messages, handle carriage returns, etc. This means that the code should be more complicated than your version. Try the following and report back what System.print messages are generated in the debug panel.

function Feedback()
{
Response = "";
Socket = new TCPSocket();
Socket.onConnect = function () {Socket.write("\\05FF0073073800\r");};
Socket.onData = function ()
{
if (Socket.connected === true)
{
Response += Socket.read();
while(Response.indexOf("\r") != -1)
{
StringLen = Response.indexOf("\r");
ReceiveString = Response.substring(0,StringLen);
if(ReceiveString.substring(0,1) == "\n")
{ReceiveString = ReceiveString.substring(1);}
if(Response.indexOf("\r\n") != -1)
{Response = Response.substring(StringLen+1);}
else {Response = Response.substring(StringLen+2);}
System.print("received string: " + ReceiveString);
}
}
};
Socket.onClose = function () {};
Socket.onIOError = function(e) {};
Socket.connect("192.168.10.25", 8005, 30000);
}