Ping IP doesn't work

[MantasJ]

Hello,

I am using this script: https://forum.logicmachine.net/showthread.php?tid=1035 to ping an IP adress of a laptop in the same network as the LM is. It somewhy does not work, I transformed script into this:

Code:

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function socketping(ip, port, timeout)   port = port or 80   local sock = require('socket').tcp()   sock:settimeout(timeout or 20)   local res, err = sock:connect(ip, port)   log(res)   log(err)   sock:close()     return res, err end ip = '192.168.100.149' if socketping(ip) then   log('CONNECTED')   grp.write('0/0/9', true) else   log('DISCONECTED') end

But it always logs disconected, no matter what I try. If I ping the IP from cmd, it pings fine. Where could be the problem?

Thank You.

[Daniel]

Log what error tells you. You need to check on which port you can access this PC. Most likely firewall blocks it. I tested it with another LM and the script itself works.

[admin]

This is not standard ping. It tries to connect to port 80, so unless you have a web server running on laptop it will not work.

Use this function instead:

Code:

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function ping(ip)   local res = os.execute('ping -c 2 -W 5 ' .. ip)   return res == 0 end

[MantasJ]

Thank You guys. I've tried the script, but now it always logs that the IP is connected even though it is on another network. I don't understand, if there is something I'm doing wrong? Here is the script:

Code:

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function ping(ip)   local res = os.execute('ping -c 2 -W 5 ' .. ip)   return res == 0 end ping('192.168.100.222') if ping then   log('Connected')   log(ping)   --grp.checkwrite('0/0/9', true) else   log('Disconected')   --grp.checkwrite('0/0/9', false) end

If I ping this IP from cmd the request times out and it is disconected, but if I run this script it says it is connected. Maybe I have to somehow decode the data from "res"?

This is what logs gives me:

Code:

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Ping IP 08.08.2019 11:04:40 * string: Connected Ping IP 08.08.2019 11:04:40 * function: 0xb6b9d158

[Daniel]

Correct your line 6 to this

Code:

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ping=ping('192.168.100.222')

[MantasJ]

Thank You Daniel, it works perfectly

[AlexLV]

Hi,

I want to use ping function for many IP check in one script, but how correctly to use function many times?
I did this way but error.. Resident script:53: attempt to call global 'ping' (a boolean value)
stack traceback:
Error apear when I want to use function with other IP..

Code:

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function ping(ip)   local res = os.execute('ping -c 2 -W 5 ' .. ip)   return res == 0 end ping=ping('192.168.45.1') if ping then   --log('Connected')   --log(ping)   grp.checkwrite('11/0/1', true) else   log('Disconected')   grp.checkwrite('11/0/1', false) end ping=ping('192.168.45.2') --line 53 if ping then   --log('Connected')   --log(ping)   grp.checkwrite('11/0/2', true) --else   --log('Disconected')   grp.checkwrite('11/0/2', false) end ping=ping('192.168.45.205') if ping then   --log('Connected')   --log(ping)   grp.checkwrite('11/0/3', true) else   --log('Disconected')   grp.checkwrite('11/0/3', false) end ping=ping('192.168.45.235') if ping then   --log('Connected')   --log(ping)   grp.checkwrite('11/0/4', true) else   --log('Disconected')   grp.checkwrite('11/0/4', false) end ping=ping('192.168.45.210') if ping then   --log('Connected')   --log(ping)   grp.checkwrite('11/0/5', true) else   --log('Disconected')   grp.checkwrite('11/0/5', false) end

Alex

[admin]

It does not work because you've set the result to variable with the same name as the function. So ping is no longer a function but boolean variable.
Another thing is that if/else is not needed, you can pass the result directly to checkwrite:

Code:

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function ping(ip)   local res = os.execute('ping -c 2 -W 5 ' .. ip)   return res == 0 end res = ping('192.168.45.1') grp.checkwrite('11/0/1', res)

[AlexLV]

OK,

Big thanks for correcting our mistakes ans possibility to learn right ways of LUA programming!

Alex

[djaval]

Hi All!

The solution doesn't work on LSS100200.

My script is follow:

Code:

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function ping(ip)   local res = os.execute('ping -c 2 -W 5 ' .. ip)   return res == 0 end -- res = ping('10.25.90.209') res = ping('10.25.90.12') grp.checkupdate('5.SHAVIP.2_MEGateway_Status', res)

In error log I see this:

Code:

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os.execute call blocked

[admin]

Disable "Block unsafe functions in scripts" in Utilities > General configuration.

[khalil]

Dear admin,
is there any concerns using telnet in this way, while I got response as ping  0 == succeed

Code:

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os.execute('telnet ' .. ip .. port)

[admin]

Instead of executing ping/telnet you can try connecting to a known open TCP port on a device if it has one.

Code:

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function pingtcp(ip, port)   local sock = require('socket').tcp()   sock:settimeout(1)   local res, err = sock:connect(ip, port)   sock:close()   return res, err end res, err = pingtcp('192.168.1.1', 80) log(res, err)

[khalil]

Instead of executing ping/telnet you can try connecting to a known open TCP port on a device if it has one.

Code:

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function pingtcp(ip, port)   local sock = require('socket').tcp()   sock:settimeout(1)   local res, err = sock:connect(ip, port)   sock:close()   return res, err end res, err = pingtcp('192.168.1.1', 80) log(res, err)

thank you 
does this work with ftp port 21?

[admin]

It should work with any service that uses TCP - HTTP, FTP, Telnet, SSH etc.