Prinout OPC UA's server username.

coupler/cli.h

@@ -142,6 +142,7 @@ void handleCLI(int argc, char **argv) {
     printf("server_ip_address=%s\n", arguments.server_ip_address);
     printf("Block device=%s\n", arguments.device);
     printf("Slave address list=%s\n", arguments.slave_address_list);
+    printf("Username=%s\n", arguments.username);
     printf("Key=%s\n", arguments.key);
     printf("Certificate=%s\n", arguments.certificate);
     printf("ID=%d\n", arguments.id);