From my experience, if you want to have a consistent data transfer over the softserial, you must disable (in Arduino) the globel interrupts for the time of transmission. To disable global interrupts use cli() command, to enable it again use sei() command.

From my experience, if you want to have a consistent data transfer over the softserial, you must disable (in Arduino) the global interrupts for the time of transmission. To disable global interrupts use cli() command, to enable it again use sei() command.