Ping a device

deps · December 2013

I need to know online\offline status of a SAT tuner by Ethernet. There is no standart command like a PING in Netlinx, so I'm using
IP_CLIENT_OPEN command and looking at error I'm receiving: if it is 6 - Connection refused - device is Online, if another - Offline. It works correctly few days, and then becomes unstable. May be too much tryings to open connection.
Maybe somebody knows another ways to ping?

JasonS · December 2013

It is not ideal, but you can have the AMX master telnet into itself and send the ping command to your device. I just tried it on my master running 4.1.400 firmware, and the ping responds much faster than it used to. You don't need to send the "msg on" command after you connect.

Welcome to NetLinx v4.1.400 Copyright AMX LLC 2012
>ping 8.8.8.8
8.8.8.8 is alive.
>ping 8.1.1.1
8.1.1.1 did not respond.

deps · December 2013

JasonS wrote: »

It is not ideal, but you can have the AMX master telnet into itself and send the ping command to your device.
[/code]

Thank you! How do I do it?

JasonS · December 2013

Here is some very basic code off the top of my head to give you an idea...

DEFINE_DEVICE

    LocalPort = 0:4:0 //Local IP Port

DEFINE_FUNCTION Ping()
{
    IP_CLIENT_OPEN(LocalPort.Port, '127.0.0.1', 23, IP_TCP)
}

DATA_EVENT [LocalPort]
{
    ONLINE:
    {
        SEND_STRING LocalPort, "'ping 8.8.8.8', $0D"
    }
    STRING:
    {
        IF (FIND_STRING(Data.Text, 'is alive', 1))
        {
            //Success
        }
        ELSE IF (FIND_STRING(Data.Text, 'did not respond', 1)) 
        {
            //Fail
        }
        IP_CLIENT_CLOSE(LocalPort.Port)
    }
}

You will want to add more code for error trapping, port connection status, etc.

JasonS · December 2013

Oops, I forgot to catch the login banner. You will want to make sure you don't close the port when you receive the "Welcome to NetLinx " message. Try this...

DEFINE_DEVICE

    LocalPort = 0:4:0 //Local IP Port

DEFINE_FUNCTION Ping()
{
    IP_CLIENT_OPEN(LocalPort.Port, '127.0.0.1', 23, IP_TCP)
}

DATA_EVENT [LocalPort]
{
    STRING:
    {
        IF  (FIND_STRING(Data.Text, 'Welcome to NetLinx', 1))
        {
            SEND_STRING LocalPort, "'ping 8.8.8.8', $0D"
        }
        ELSE 
        {
            IF (FIND_STRING(Data.Text, 'is alive', 1))
            {
                //Success
            }
            ELSE IF (FIND_STRING(Data.Text, 'did not respond', 1)) 
            {
                //Fail
            }
            IP_CLIENT_CLOSE(LocalPort.Port)
        }
    }
}

deps · December 2013

Thank you, I'll try it!

Ping a device

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