Maximum baud rate

[theinlinaung2010]

Hi, I am trying to use CmdMessenger library with over 115200 bps baud rate but didn't have any success. I uploaded a test sketch which sends a value with 250000 bps (using the library). When I opened the serial monitor in Arduino IDE, I can see the values. But the C# program was not triggering the callback routines (even if baud rate was correct). So I think the receiving end is the problem because it does not work although the values are being sent correctly.