Ninterserial records a log of every events that have occurred in it, since the moment of the connection stablishment, till the certification of message delivering. In other words, ou can diagnose and discover what is happening with your project without headache.
With the log file in hands you will be also able to reproduce your footsteps so as to reach a result that you have already achieved before, besides the fact of having another program debugger tool.
If Ninterserial presents you any error when it was not supposed to, you can check if the problem is either the projected circuit or the program, and if it is in the program, you will be able to save the log file and send it for us, explaining what is happening and what ought to happen, then we can solve this problem in a easily manner.