Best way to check if host is up

Projects Networking, Protocols, and Devices
1

Hi there,

I would like your opinion about the best way to know if a host is up or down, I tried using ping , it works, but I got a delay around 4s on loop.

any suggetion to do it faster?.

thanks you.

2

Welcome to the forum

Please read the How to get the best out of this forum

Here are a few points that could help answer your question:

  • Is the host in the same room or on the other side of the world?
  • What does the network between the two devices look like? (WiFi, Ethernet, router, ISP ...)
  • What board do you have?
  • Which library are you using?
  • Did you try to ping the host from a different machine?
  • What was the shortest and longest delay from different machines?
  • Can you post a small example code that demonstrates your issue?
3

I'm using ESP32 and Host is in same network ( LAN ) , it isn't a issue, it's just that ping ( ESP8266Ping.h ) takes too much time to return result and I would like to know if there is any other solution to improve it ( telnet? ) other way to know if host is up

if(Ping.ping(getIP())){
     dotrue();
}else{
     dofalse();
}
4

I did a quick Google search and found the following library.

The ping function has a second parameter count which is set to 5 as default inside the library. When I called the function with count set to 1, I got an execution time of a few milliseconds over 1 second. (6 to 25ms) With the parameter set to 0, the function takes 10 seconds but sends many pings during that time.

Would ~1 second be good enough for you? Or would you like something faster? How fast would be good enough? If that can be changed there is likely a trade-off between execution time and failure rate.

If you provide a link to the library you are using (e.g., GitHub), I could have a look at the source code.

5

Thanks you Klaus_K, I set 1 after and delay was OK for my project.

if(Ping.ping(getIP(),1)){
     dotrue();
}else{
     dofalse();
}
6

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.