However, after go through the source code of AFSoftSerial.cpp, it seems that it only supports down to 4800........
_baudRate = speed;
switch (_baudRate) {
case 57600:
_bitDelay = 17; break;
case 38400:
_bitDelay = 28; break;
case 31250:
_bitDelay = 36; break;
case 19200:
_bitDelay = 62; break;
case 9600:
_bitDelay = 128; break;
case 4800:
_bitDelay = 270; break;
default:
_bitDelay = 0;
}