/* DESC: This script will read the node value at a OPC-UA server.
 * Copyright (C) 2015 NetModule AG, Switzerland
 */

void usage () 
{
    printf("usage: opcua-read.are <server> <port> <node-index> <node-id>\n");
    exit(1);
}

if (argc != 4) {
    usage();
}

server = argv[1];               /* hostname or address */
port = (int) argv[2];           /* TCP port */
nindex = (int) argv[3];         /* node index (e.g. 0) */
nid = (int) argv[4];            /* node id (e.g. 85 = root) */

url = sprintf("opc.tcp://%s:%d", server, port);

client = nb_opcua_connect(url);
if (client < 0) {
    printf("unable to connect to %s", url);
    exit(0);
}

value = nb_opcua_read(client, nindex, nid);
if (is_void(value)) {
    printf("unable to read value of node %d:%d", nindex, nid);
} else {
    dump(value);
}

nb_opcua_disconnect(client);

exit(0);