sensor/thermostat.ino


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#include <string>
#include <Wire.h>  
#include "SSD1306.h"
#include "DHTesp.h"
#include <esp_bt.h>
#include "BLEDevice.h"
#include "Ticker.h"
 
static BLEUUID thermo_service_uuid("11111111-2222-3333-4444-000000000000");
static BLEUUID thermo_temp_uuid("11111111-2222-3333-4444-000000000001");
static BLEUUID thermo_time_uuid("11111111-2222-3333-4444-000000000002");
 
#define NO_SERVER_SLEEP_TIME 60
#define ON_ERROR_SLEEP_TIME 30
#define WATCHDOG_SECONDS 30
/* Conversion factor for micro seconds to seconds */
#define uS_TO_S_FACTOR 1000000
 
#define BLE_POWER ESP_PWR_LVL_P7
// #define BLE_POWER ESP_PWR_LVL_N14 
 
SSD1306 display(0x3c, 5, 4);
DHTesp dht;
 
void show(String x) {
  display.clear();
  display.drawString(0,0,x);
  display.display();
}
 
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 public:
  BLEAddress* pServerAddress;
 
 MyAdvertisedDeviceCallbacks() :
  BLEAdvertisedDeviceCallbacks(),
    pServerAddress(0)
      {}
 
  ~MyAdvertisedDeviceCallbacks() { if (pServerAddress) delete pServerAddress; }
  
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    // We have found a device, let us now see if it contains the service we are looking for. 
    if (advertisedDevice.haveName() && advertisedDevice.getName() == "termostore") {
      advertisedDevice.getScan()->stop();
 
      pServerAddress = new BLEAddress(advertisedDevice.getAddress());
 
    } // Found our server 
  } // onResult 
}; // MyAdvertisedDeviceCallbacks 
 
void enable_sensor(bool enable) {
  pinMode(12,OUTPUT);
  digitalWrite(12,enable ? HIGH : LOW);
  delay(500);
}
 
bool read_sensor(float* humidity, float* temperature) {
  dht.setup(13,DHTesp::DHT11);
 
  int tries=0;bool ret=false;
  while (!ret && ++tries<10) {
    delay(dht.getMinimumSamplingPeriod());
    *humidity = dht.getHumidity();
    *temperature = dht.getTemperature();
 
    String data = "";
    data += *humidity;
    data += " ";
    data += *temperature;
    data += " ";
    data += dht.getStatusString();
    show(data);
 
    if (dht.getStatus() != DHTesp::ERROR_TIMEOUT) ret = true;
  }
  return ret;
}
 
uint32_t send_data_and_get_time(BLEAddress* pAddress,String* data) {
  BLEClient* pClient  = BLEDevice::createClient();
  show("Sc");
  bool ok = pClient->connect(*pAddress);
  if (!ok) {
    show("connect fail");
    return ON_ERROR_SLEEP_TIME;
  }
  String status = "SC";
  status += pClient->getPeerAddress().toString().c_str();
  show(status);
  try {
    BLERemoteService* pThermoService = pClient->getService(thermo_service_uuid);
    if (!pThermoService) {
      show("NO SERVICE");
      return 60;
    }
    BLERemoteCharacteristic* pTemp = pThermoService->getCharacteristic(thermo_temp_uuid);
    if (!pTemp) {
      show("NO TEMP CHAR");
      return 60;
    }
    show("SCw");
    pTemp->writeValue(data->c_str(),data->length());
    show("SCWr");
    BLERemoteCharacteristic* pTime = pThermoService->getCharacteristic(thermo_time_uuid);
    if (!pTime) {
      show("NO TIME CHAR");
      return 60;
    }
    std::string next_time = pTime->readValue();
    show("SCWRd");
    pClient->disconnect();
    show("SCWRD");
    return String(next_time.c_str()).toInt();
  }
  catch (...) {
    show("Fail");
    pClient->disconnect();
    return ON_ERROR_SLEEP_TIME;
  }
}
 
void setup() {
  display.init();
  display.connect();
  display.displayOn();
  display.clear();
  show("setup");
  BLEDevice::init("");
  esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_ADV, BLE_POWER);
  esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_SCAN, BLE_POWER);
  esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_DEFAULT, BLE_POWER);
  show("setup+bt");
  enable_sensor(true);
  show("setup+bt+sensor");
}
 
void teardown_and_sleep(int next_time) {
  enable_sensor(false);
  BLEDevice::uninit();
  //esp_wifi_stop(); 
  delay(2000);
  esp_sleep_enable_timer_wakeup(next_time * uS_TO_S_FACTOR);
  esp_deep_sleep_start();
}
 
void watchdog_cb() {
  show("watchdog");
  teardown_and_sleep(ON_ERROR_SLEEP_TIME);
}
 
void loop() {
  Ticker watchdog_timer;
  watchdog_timer.attach(WATCHDOG_SECONDS,watchdog_cb);
 
  BLEScan* pBLEScan = BLEDevice::getScan();
  MyAdvertisedDeviceCallbacks* cb = new MyAdvertisedDeviceCallbacks();
  pBLEScan->setAdvertisedDeviceCallbacks(cb);
  pBLEScan->setActiveScan(true);
  show("s");
  BLEScanResults foundDevices = pBLEScan->start(30);
  int next_time;
 
  if (cb->pServerAddress) {
    show("S");
 
    float humidity, temperature;
    bool ok = read_sensor(&humidity,&temperature);
    if (ok) {
      String data = String(BLEDevice::getAddress().toString().c_str()) + " " + String(humidity) + " " + String(temperature) + "\n";
      show(data);
    
      next_time = send_data_and_get_time(cb->pServerAddress,&data);
    }
    else {
      show("no thermo");
      next_time=ON_ERROR_SLEEP_TIME;
    }
  }
  else {
    display.drawString(0,0,"s!");display.display();
    next_time = NO_SERVER_SLEEP_TIME;
  }
 
  delete cb;
 
  String nt = "Next time:";nt+=next_time;
  display.drawString(0,20,nt);display.display();
  teardown_and_sleep(next_time);
 
  show("woken up");
  delay(2000);
}