From 87fd0f35f68565dffcdf5445fcbefc68f9f59423 Mon Sep 17 00:00:00 2001
From: Clemens-Dautermann <git@cdaut.de>
Date: Sun, 6 Feb 2022 19:30:51 +0100
Subject: [PATCH] created bluetooth server

---
 src/ble/BluetoothServer.cpp | 92 +++++++++++++++++++++++++++++++++++++
 src/ble/BluetoothServer.h   | 25 ++++++++++
 src/main.cpp                | 15 ++++--
 src/sensors/BmpSensor.cpp   |  3 +-
 4 files changed, 130 insertions(+), 5 deletions(-)
 create mode 100644 src/ble/BluetoothServer.cpp
 create mode 100644 src/ble/BluetoothServer.h

diff --git a/src/ble/BluetoothServer.cpp b/src/ble/BluetoothServer.cpp
new file mode 100644
index 0000000..4586e42
--- /dev/null
+++ b/src/ble/BluetoothServer.cpp
@@ -0,0 +1,92 @@
+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLE2902.h>
+#include "BluetoothServer.h"
+
+#define INTERNAL_LED_PIN 2
+#define BLE_SERVER_NAME "ClimateGO"
+#define SERVICE_UUID "2150123c-af53-4038-bc92-ba3d0870a9e4"
+#define TEMPERATURE_CHARACTERISTIC_UUID "cba1d466-344c-4be3-ab3f-189f80dd7518"
+#define PRESSURE_CHARACTERISTIC_UUID "ca73b3ba-39f6-4ab3-91ae-186dc9577d99"
+
+//Setup callbacks onConnect and onDisconnect
+class ServerCallbacks : public BLEServerCallbacks {
+    void onConnect(BLEServer *pServer) override {
+        Serial.println("New device connected.");
+        digitalWrite(INTERNAL_LED_PIN, HIGH);
+    };
+
+    void onDisconnect(BLEServer *pServer) override {
+        Serial.println("Device disconnected.");
+        digitalWrite(INTERNAL_LED_PIN, LOW);
+        //restart advertising on device disconnect
+        pServer->getAdvertising()->start();
+    }
+};
+
+/**
+ * Represents the Bluetooth server that handles all interactions
+ */
+BluetoothServer::BluetoothServer() {
+    // Create the BLE Device
+    BLEDevice::init(BLE_SERVER_NAME);
+
+    // Create the BLE Server
+    this->bleServer = BLEDevice::createServer();
+    bleServer->setCallbacks(new ServerCallbacks());
+
+    // Create the BLE Service
+    this->sensorService = bleServer->createService(SERVICE_UUID);
+
+    //create characteristics that will enable data sharing
+    BLECharacteristic *temperatureCharacteristic = sensorService->createCharacteristic(
+            TEMPERATURE_CHARACTERISTIC_UUID,
+            BLECharacteristic::PROPERTY_READ
+    );
+    BLECharacteristic *pressureCharacteristic = sensorService->createCharacteristic(
+            PRESSURE_CHARACTERISTIC_UUID,
+            BLECharacteristic::PROPERTY_READ
+    );
+
+    //set initial values
+    temperatureCharacteristic->setValue("NA");
+    pressureCharacteristic->setValue("NA");
+}
+
+/**
+ * Method to start the Bluetooth server and enable advertising to allow other devices to connect
+ */
+void BluetoothServer::startServer() {
+    // Start the service
+    this->sensorService->start();
+
+    // Start advertising
+    BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
+    pAdvertising->addServiceUUID(SERVICE_UUID);
+    this->bleServer->getAdvertising()->start();
+    Serial.println("Started BLE Server.");
+}
+
+/**
+ * TODO: Convert temperature to string somehow
+ * Publish a new temperature to the appropriate characteristic
+ * @param temperature the new temperature
+ */
+void BluetoothServer::setTemperature(float temperature) {
+    sensorService
+            ->getCharacteristic(TEMPERATURE_CHARACTERISTIC_UUID)
+            ->setValue(temperature);
+}
+
+/**
+ * TODO: Convert pressure to string somehow
+ * Publish a new pressure to the appropriate characteristic
+ * @param pressure the new pressure
+ */
+void BluetoothServer::setPressure(float pressure) {
+    sensorService
+            ->getCharacteristic(PRESSURE_CHARACTERISTIC_UUID)
+            ->setValue(pressure);
+}
+
+
diff --git a/src/ble/BluetoothServer.h b/src/ble/BluetoothServer.h
new file mode 100644
index 0000000..4afd1ec
--- /dev/null
+++ b/src/ble/BluetoothServer.h
@@ -0,0 +1,25 @@
+#ifndef NEW_CLIMTE_GO_BLUETOOTHSERVER_H
+#define NEW_CLIMTE_GO_BLUETOOTHSERVER_H
+
+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLEUtils.h>
+#include <BLE2902.h>
+#include <Arduino.h>
+
+#define temperatureCelsius
+
+class BluetoothServer {
+private:
+    BLEService *sensorService;
+    BLEServer *bleServer;
+public:
+    BluetoothServer();
+
+    void startServer();
+    void setTemperature(float temperature);
+    void setPressure(float pressure);
+};
+
+
+#endif //NEW_CLIMTE_GO_BLUETOOTHSERVER_H
diff --git a/src/main.cpp b/src/main.cpp
index 5dad5cb..38b5852 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,21 +1,28 @@
 #include <Arduino.h>
 #include <sensors/BmpSensor.h>
+#include <ble/BluetoothServer.h>
 
 #define SLEEP_TIME 2
 #define BAUD_RATE 112500
+#define INTERNAL_LED_PIN 2
+
 
 Sensor *bmpSensor;
+BluetoothServer *server;
 
 void setup() {
     Serial.begin(BAUD_RATE);
+    pinMode(INTERNAL_LED_PIN, OUTPUT);
+
     bmpSensor = new BmpSensor();
+
+    server = new BluetoothServer();
+    server->startServer();
 }
 
 void loop() {
     sensor_data_t sample = ((BmpSensor *) bmpSensor)->sampleLowEnergy();
-    Serial.printf("Temperature: %f | Pressure: %f \n",
-                  sample.temperature,
-                  sample.pressure
-    );
+    server->setPressure(sample.pressure);
+    server->setTemperature(sample.temperature);
     delay(SLEEP_TIME * 1000);
 }
\ No newline at end of file
diff --git a/src/sensors/BmpSensor.cpp b/src/sensors/BmpSensor.cpp
index 97dd6fb..7f68a25 100644
--- a/src/sensors/BmpSensor.cpp
+++ b/src/sensors/BmpSensor.cpp
@@ -74,7 +74,8 @@ sensor_data_t BmpSensor::sample() {
 }
 
 /**
- * Read a sample and put sensor to standby mode
+ * Read a sample and put sensor to standby mode.
+ * !!! Do not use this if sampling time is <= 500ms !!!
  * @return the sample read
  */
 sensor_data_t BmpSensor::sampleLowEnergy() {