[aprssig] of interest to IGate client authors?

Pete Loveall AE5PL Lists hamlists at ametx.com
Sat Nov 26 09:37:34 CST 2016


Once again caught by Reply defaulting to the original sender, not the list...

Jim,

It means what it says (I recommend you research what the Nagel algorithm is with regards to TCP).  This is not something that a user does but www.aprs-is.net is written for software authors, not software users.  Client software authors (IGates or non-IGates) can remove default delays in the TCP protocol by disabling the Nagel algorithm for bidirectional clients.  It makes no difference what port they connect to but you used UDP and HTTP in your post which are both -unidirectional-  and UDP doesn't even incorporate the Nagel algorithm because it is connectionless UDP, not TCP.

73,

Pete Loveall AE5PL
pete at ae5pl dot net

> -----Original Message-----
> From: Jim Alles
> Sent: Saturday, November 26, 2016 8:11 AM
> Subject: Re: [aprssig] of interest to IGate client authors?
> 
> ​I have one item that I can't seem to find any definition of from
> http://www.aprs-is.net/Connecting.aspx
> 
> "If your client software is bidirectional (sends and receives), turn off the Nagel
> algorithm when connecting to APRS-IS as it can introduce significant delays
> (TCP_NODELAY)​"
> 
> Could you please describe its function, the syntax of the command, and the
> behavior of connecting to the restricted feed (TCP port 14580) vs. TCP port
> 8080 & HTTP.


More information about the aprssig mailing list