Sample echo client for nanomsg

nanomsg_echo_client.c

// gcc -o echo_client -g  examples/echo_client.c -I ../nanomsg/src -L ../nanomsg/build -l nanomsg                                                                                                                                            
// LD_LIBRARY_PATH="$LD_LIBRARY_PATH:../nanomsg/build" ./echo_client foobar                                                                                                                                                                  

#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "nn.h"
#include "reqrep.h"

int main( int argc, const char* argv[] )
{
    printf( "...client started... '%s'\n", argv[1] );

    int s = nn_socket( AF_SP, NN_REQ );
    printf("socket returned: %d\n", s );
    assert( s >= 0 );

    int rc = nn_connect( s, "tcp://127.0.0.1:5556" );
    printf("nn_connect returned: %d\n", rc );
    assert( rc > 0 );

    int sz = nn_send( s, argv[1], strlen(argv[1]), 0 );
    printf("nn_send returned: %d\n", sz );
    assert( sz > 0 );

    char buf[100];
    sz = nn_recv( s, buf, 100, 0 );
    printf("nn_recv returned: %d\n", sz );
    assert( sz > 0 );

    printf( "received %s\n", buf );

    printf( "...client done...\n" );
    return 0;
}