Does anything work via the plugin? Here is why, the log output on SmartThings logs the IP and port as Hex string in the log file. The port is show as "0050" in that log output. However, you show 192.168.68.139:1880 as you IP/port for NR so I would expect a log output of "0758". Are you sure you entered the right information in the SmartApp on SmartThings?
In the smartapp, make sure that the URL has the port included....
