const int TX_PIN = 4;   // ESP8266 pin D2

typedef struct  {
    boolean power;
    int duration;   // micro seconds
} signal;

const signal SHORT_ON { true, 500 };
const signal SHORT_OFF { false, 2000 };
const signal LONG_ON { true, 850 }; // not used
const signal LONG_OFF { false, 4000 };
const signal STOP_OFF { false, 500 };
const int REST = 9000; // 9 ms gap


// Here's a temperature of 24.5 forever...
//
signal sig_1 [] {
    SHORT_ON,             // start bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    
    LONG_OFF, SHORT_ON,   // a one (1) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    
    LONG_OFF, SHORT_ON,   // a one (1) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit

    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
//    LONG_OFF, SHORT_ON,   // a one (1) bit

    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit

    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit

    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit

    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    LONG_OFF, SHORT_ON,   // a one (1) bit
    SHORT_OFF, SHORT_ON,  // a zero (0) bit

    STOP_OFF, SHORT_ON    // stop bit
};


void doTransmission(signal array[67]) {

    Serial.println("Doing transmission...");
    for (int burst = 1; burst <= 7; burst++) {

        for (int idx = 0; idx < 66; ++idx ) {   // payload
            digitalWrite(TX_PIN, array[idx].power);
            delayMicroseconds( array[idx].duration );
        }
        delayMicroseconds(REST);                // rest between bursts
    }
}

void setup ( void ) {
    pinMode(TX_PIN, OUTPUT);
    Serial.begin ( 115200 );
}


void loop ( void ) {

  Serial.println("Sending...");
  doTransmission(sig_1);
  delay(10000);

}