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//HeroJR Bluetooth the Serial Bridge (supports 7,E,1)
//2021 dabone
//based off the example code in arduino.
//
//This example code is in the Public Domain (or CC0 licensed, at your option.)
//By Evandro Copercini - 2018
//
//This example creates a bridge between Serial and Classical Bluetooth (SPP)
//and also demonstrate that SerialBT have the same functionalities of a normal Serial

#include "BluetoothSerial.h"
#define LED 2
char RobotName[] = "HeroSerialPortTest1";                                             //Name Your Robot's Bluetooth
#define BTtimeout 60000                                                               //How Many Milliseconds to wait before powerdown. 60000 is one minute
bool isconnected = false;
bool hasconnected = false;
bool btstarted = false;
unsigned long lastchecked;
unsigned long elapsed; 
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

void setup() {
  pinMode(LED,OUTPUT);
  lastchecked = millis();
  //Serial.begin(9600,SERIAL_7E1);                                                  //Serial Settings for the HERO Jr.... Don't you love 80's tech?
  Serial.begin(115200);                                                             //Serial Settings for debug.
}


void callback(esp_spp_cb_event_t event, esp_spp_cb_param_t *param){
  if(event == ESP_SPP_SRV_OPEN_EVT){
    Serial.println("Client Connected");
    digitalWrite(LED,HIGH);
    isconnected = true;
    hasconnected = true;
  }
 
  if(event == ESP_SPP_CLOSE_EVT ){
    Serial.println("Client disconnected");
    isconnected = false;
    Serial.println("Isconnected set to off");
    lastchecked = millis();
    digitalWrite(LED,LOW);
    Serial.println("Led Turned Off");
  }
}

int startBT (){
  SerialBT.begin(RobotName); //Bluetooth device name
  btstarted = true;
  }

int restartBT (){
    Serial.println ("Stopping BT");
    SerialBT.flush();
    SerialBT.end();
    Serial.println ("Re-starting BT");
    delay (1000);
    btstarted = false;
    hasconnected = true;
}

int serialbridge() {
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }
  if (SerialBT.available()) {
    Serial.write(SerialBT.read());
  }
  delay(20);
}


void loop() {

  if (!btstarted) {                                                               //Is the Bluetooth SPP Started yet? If not, so the initial start.
    startBT();
    Serial.println("Bluetooth active");
  }


SerialBT.register_callback(callback);                                             //Check the status of the Bluetooth Connection

  
  if (!isconnected && !hasconnected) {                                            //Do we have a incoming connection active? and also, has there ever been a active incoming connection?
    elapsed = millis() - lastchecked;                                             //If neither is true, then lets check for the time out. If we get to the final timeout, put the esp32
    if(elapsed > BTtimeout){                                                      //in deep sleep mode to save battery power on the robot.
      Serial.println("Timeout Reached");
      lastchecked = millis();
      //esp_deep_sleep_start();
    }
  }

  
  if (!isconnected && hasconnected) {                                             //If we have connected, and then disconnected, restart the Bluetooth so we can connect again.
    restartBT();
  }

  if (isconnected) {                                                              //If we have a active connection, process serial data on the bridge
    serialbridge ();
  }
}