[riot-users] libcoap example

Nikos Fotiou fotiou at aueb.gr
Fri Nov 25 15:35:17 CET 2016

Hi all,

Here, I have uploaded an example of a libcoap based  server for the riot 
os  https://github.com/nikosft/libcoap/tree/master/riot I have 
successfully tested with the native port. Some comments

* The libcoap version included in riot is quit old (almost 3 years old; 
it uses a commit from 5 Feb. 2014)
* Most libcoap examples I have seen use the "select (file descriptor)" 
command to read from a socket. This command behaves strangely in riot, 
that's why I am not using it.
* libcoap sets the "SO_REUSEADDR" option to the listening socket. It 
seems that riot generates an error for that. To verify that it is not a 
libcoap problem I added the following three lines at 
riot/examples/posix_sockets/ after line 46 and it outputs "Error setting 

int on = 1;
if (setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) 
< 0)
    puts("Error setting option");


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