/*
  ModbusRTU ESP8266/ESP32
  Read multiple coils from slave device example

  (c)2019 Alexander Emelianov ([email protected])
  https://github.com/emelianov/modbus-esp8266

  modified 13 May 2020
  by brainelectronics

  This code is licensed under the BSD New License. See LICENSE.txt for more info.
*/

#include <ModbusRTU.h>

ModbusRTU mb;

bool cbWrite(Modbus::ResultCode event, uint16_t transactionId, void* data) {
#ifdef ESP8266
  Serial.printf_P("Request result: 0x%02X, Mem: %d\n", event, ESP.getFreeHeap());
#elif ESP32
  Serial.printf_P("Request result: 0x%02X, Mem: %d\n", event, ESP.getFreeHeap());
#else
  Serial.print("Request result: 0x");
  Serial.print(event, HEX);
#endif
  return true;
}

void setup() {
  Serial.begin(9600, SERIAL_8N1);
  mb.begin(&Serial);
  mb.master();
}

bool coils[8];
bool coils_on[8] = {true, true, true, true, true, true, true, true };
bool coils_off[8] = {false, false, false, false, false, false, false, false };
void loop() {
  delay(500);
  if (!mb.slave()) {
    mb.readCoil(1, 0, coils, 8, cbWrite);
    // for (int i = 0; i < 8; i++) {
    //   Serial.print(coils[i]);
    // }
  }
  // for (int i = 0; i < 8; i++) {
  //   if (!mb.slave()) {
      mb.writeCoil(1, 0, coils_on, 2, cbWrite);
      delay(500);
  //   }
  // }
  // for (int i = 0; i < 8; i++) {
  //   if (!mb.slave()) {
      mb.writeCoil(1, 0, coils_off, 2, cbWrite);
    delay(500);
  //   }
  // }

  mb.task();
  yield();
}
//------------------------
/*
  ModbusRTU ESP8266/ESP32
  Simple slave example

  (c)2019 Alexander Emelianov ([email protected])
  https://github.com/emelianov/modbus-esp8266

  modified 13 May 2020
  by brainelectronics

  This code is licensed under the BSD New License. See LICENSE.txt for more info.
*/

// #include <ModbusRTU.h>

// #define REGN 10
// #define SLAVE_ID 1
// #define LED_Pin 23
// ModbusRTU mb;

// void setup() {
//   pinMode(LED_Pin, OUTPUT);
//   Serial.begin(9600, SERIAL_8N1);
// #if defined(ESP32) || defined(ESP8266)
//   mb.begin(&Serial);
// #else
//   mb.begin(&Serial);
//   //mb.begin(&Serial, RXTX_PIN);  //or use RX/TX direction control pin (if required)
//   mb.setBaudrate(9600);
// #endif
//   mb.slave(SLAVE_ID);
//   mb.addHreg(REGN);
//   mb.Hreg(REGN, 100);
// }

// void loop() {
//   mb.task();
//   yield();

// }