/*
   EddystoneTLM beacon by BeeGee based on https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_Eddystone_TLM_deepsleep/ESP32_Eddystone_TLM_deepsleep.ino
   EddystoneTLM frame specification https://github.com/google/eddystone/blob/master/eddystone-tlm/tlm-plain.md
*/

#include <Mussel.h>

#include "BLEDevice.h"
#include "BLEBeacon.h"
#include "BLEAdvertising.h"
#include "BLEEddystoneTLM.h"

Mussel mussel(2);

#define BEACON_POWER             ESP_PWR_LVL_N12

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
BLEAdvertising *pAdvertising;

#define BEACON_UUID "8ec76ea3-6668-48da-9866-75be8bc86f4d"  // UUID 1 128-Bit (may use linux tool uuidgen or random numbers via https://www.uuidgenerator.net/)

// Check
// https://github.com/google/eddystone/blob/master/eddystone-tlm/tlm-plain.md
// and http://www.hugi.scene.org/online/coding/hugi%2015%20-%20cmtadfix.htm
// for the temperature value. It is a 8.8 fixed-point notation
void setBeacon() {
  BLEEddystoneTLM EddystoneTLM;
  EddystoneTLM.setTemp(mussel.read());  // 3000 = 30.00 ˚C
  Serial.printf("Temperature is %.2f°C\n", EddystoneTLM.getTemp());

  BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
  BLEAdvertisementData oScanResponseData = BLEAdvertisementData();
  oScanResponseData.setServiceData(BLEUUID((uint16_t)0xFEAA), String(EddystoneTLM.getData().c_str(), EddystoneTLM.getData().length()));

  oAdvertisementData.setName("ESP32 TLM Beacon");
  pAdvertising->setAdvertisementData(oAdvertisementData);
  pAdvertising->setScanResponseData(oScanResponseData);
}

void setup() {
  Serial.begin(115200);
  mussel.begin();
  BLEDevice::init("TLMBeacon");
  BLEDevice::setPower(BEACON_POWER);
  pAdvertising = BLEDevice::getAdvertising();
  setBeacon();
  pAdvertising->start();
}

void loop() {
  setBeacon();
  delay(500);
}