#include <SoftwareSerial.h>
SoftwareSerial BT(9,8); // RX | TX
const int val = 0, Monitor_val = 38400, Bt_speed = 9600;
const int L[2] = {3, 5}, R[2] = {6, 9};
inline void swap(auto &a, auto &b) {
    auto c = b;
    b = a;
    a = c;
}
void setup() {
    Serial.begin(Monitor_val);
    Serial.println("Arduino Nano Ready");
    BT.begin(Bt_speed);
    for (int i = 0;i < 2;++i)
        pinMode(L[i], OUTPUT), pinMode(R[i], OUTPUT);
}
int getint() {
    static int p;
    int x = 0;
    while (!BT.available() || isdigit(p = BT.read()))
        x = x * 10 + p;
    return x;
}
String getstring(char sep = '\n') {
    static char p;
    String x;
    while (!BT.available() || (p = BT.read()) != sep)
        x += p;
    return x;
}
void loop() {
    static int t;
//  delay(1);
    Serial.print("Test Now Ok ");
    Serial.print(++t);
    Serial.print('\n');
    drive();
}
void drive() {
    int a = getint(), b = getint();
    update(L, a), update(R, b);
}
void update(int *pin, int val) {
    val -= 128;
    int a = pin[0], b = pin[1];
    if (val < 0) swap(a, b), val *= -1;
    analogWrite(a, 0), analogWrite(b, val);
}