ATTiny85 Serial communication with Bluetooth Module - arduino

Question

For a simple project, I would like to use an ATTiny85 connected to an HC-06 Bluetooth module, so it can talk to my Android phone.
I wrote code for my Arduino Uno and it worked as expected. When I changed the code to use on my ATTiny85 I got an error saying that 'Serial' was not declared in this scope and assumed that the ATTiny does not support Hardware Serial.
I need to read a String when received and sleep the MCU when not receiving. I went to use SoftwareSerial and was not able to get a String, just the first char.
I approached it in some way, like defining a char string[10]; as global and string[i] = mySerial.read(); i++; inside the loop, but it keeps not working. Whether it is the sleep, or my work to read data, I couldn't make it work.
Can someone provide a way to put a ATTiny85 to sleep, wake up to receive a String through Serial and sleep until the next data through Serial, please?
To sleep I'm using
void sleep() {
GIMSK |= _BV(PCIE); // Enable Pin Change Interrupts
PCMSK |= _BV(PCINT3); // Use PB3 as interrupt pin
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable(); // Sets the Sleep Enable bit in the MCUCR Register (SE BIT)
sei(); // Enable interrupts
sleep_cpu(); // sleep
// woke up
cli(); // Disable interrupts
PCMSK &= ~_BV(PCINT3); // Turn off PB3 as interrupt pin
sleep_disable(); // Clear Sleep Enable bit
sei(); // Enable interrupts
}
ISR(PCINT3_vect) {
}
And my loop is something like
char inputString[10];
int i = 0;
void loop() {
sleep();
if (serial.available() > 0) {
char inputChar = serial.read();
if (inputChar == '2') { //Char to break
//Do something and reset i
} else {
inputString[i] = inputChar;
}
i++;
}
}
Thanks to all.

Answer 1

if (serial.available() > 0) {
That's a one-time thing. You should put this in a while loop.
while (serial.available() > 0) {
char inputChar = serial.read();
if (inputChar == '2') { //Char to break
//Do something and reset i
} else {
inputString[i] = inputChar;
}
i++;
}
Wouldn't hurt to check i after incrementing, too.