Created a basic interface for BLE on ESP32

src/lightingFirmware/SimpleBleDevice/SimpleBleDevice.ino

@@ -71,8 +71,7 @@ void loop() {
     // notify changed value
     if (deviceConnected) {
         btmessage = pCharacteristic->getValue().c_str();
-        Serial.print(btmessage);
-        delay(1000); // bluetooth stack will go into congestion, if too many packets are sent, in 6 hours test i was able to go as low as 3ms
+        mode = btmessage;
     }
     // disconnecting
     if (!deviceConnected && oldDeviceConnected) {

src/lightingFirmware/esp32_test0/esp32_test0.ino

@@ -1,30 +1,9 @@
 // Include Section
 
 #include "esp_dmx.h"
-#include "BluetoothSerial.h"
-#include <BLEDevice.h>
-#include <BLEUtils.h>
-#include <BLEServer.h>
 
-// Name of Bluetooth client.
-String BTDeviceName = "3D_SkyLED_LEDBoard";
-String BTMacAddress;
-// Check if Bluetooth is available.
-#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
-#error Bluetooth is not enabled!
-#endif
- 
-// Check if Serial Port Profile (SPP) is available.
-#if !defined(CONFIG_BT_SPP_ENABLED)
-#error Serial Port Profile for Bluetooth is not available or not enabled!
-#endif
-// Define Section
-#define BT_DISCOVER_TIME 30000
 #define INTERRUPT_PIN 0
 
-BluetoothSerial SerialBT;
-char btmessage;
-
 struct Button {
 	const uint8_t PIN;
 	uint32_t numberKeyPresses;
@@ -38,6 +17,34 @@ struct Panel {
   int led3 = 0;
 };
 
+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLEUtils.h>
+#include <BLE2902.h>
+ 
+BLEServer* pServer = NULL;
+BLECharacteristic* pCharacteristic = NULL;
+bool deviceConnected = false;
+bool oldDeviceConnected = false;
+uint32_t value = 0;
+String btmessage;
+ 
+// See the following for generating UUIDs:
+// https://www.uuidgenerator.net/
+ 
+#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
+#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
+ 
+ 
+class MyServerCallbacks: public BLEServerCallbacks {
+    void onConnect(BLEServer* pServer) {
+      deviceConnected = true;
+    };
+ 
+    void onDisconnect(BLEServer* pServer) {
+      deviceConnected = false;
+    }
+};
 
 // Defining BOOT button on ESP32 as our built-in button.
 Button button1 = {INTERRUPT_PIN, 0, false};
@@ -47,14 +54,6 @@ const int modeAmount = 16;
 uint8_t brightnessMax = 20;
 uint8_t universalBrightness = 10;
 
-
-uint8_t data[DMX_PACKET_SIZE] = {0,
-  0,universalBrightness,0,0,
-  0,universalBrightness,0,0,
-  0,universalBrightness,0,0,
-  0,universalBrightness,0,0
-};
-
 uint8_t dataSeq[modeAmount][DMX_PACKET_SIZE] = 
   {
     {
@@ -256,21 +255,74 @@ void dmxSetup() {
 
 void setup() {
 	Serial.begin(115200);
-  SerialBT.begin(BTDeviceName);
-  BTMacAddress = SerialBT.getBtAddressString();
-  Serial.println(BTMacAddress.c_str());
+  Serial.print("\nIf you receive this message, ESP32 module has finished setting up Serial Interface for communication.");
+    // Create the BLE Device
+  BLEDevice::init("Pupilometer LED Billboard");
+ 
+  // Create the BLE Server
+  pServer = BLEDevice::createServer();
+  pServer->setCallbacks(new MyServerCallbacks());
+ 
+  // Create the BLE Service
+  BLEService *pService = pServer->createService(SERVICE_UUID);
+ 
+  // Create a BLE Characteristic
+  pCharacteristic = pService->createCharacteristic(
+                      CHARACTERISTIC_UUID,
+                      BLECharacteristic::PROPERTY_READ   |
+                      BLECharacteristic::PROPERTY_WRITE  |
+                      BLECharacteristic::PROPERTY_NOTIFY |
+                      BLECharacteristic::PROPERTY_INDICATE
+                    );
+ 
+  // https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
+  // Create a BLE Descriptor
+  pCharacteristic->addDescriptor(new BLE2902());
+ 
+  // Start the service
+  pService->start();
+ 
+  // Start advertising
+  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
+  pAdvertising->addServiceUUID(SERVICE_UUID);
+  pAdvertising->setScanResponse(false);
+  pAdvertising->setMinPreferred(0x0);  // set value to 0x00 to not advertise this parameter
+  BLEDevice::startAdvertising();
+  Serial.println("Waiting a client connection to notify...");
+
 	pinMode(INTERRUPT_PIN, INPUT_PULLUP);
 	attachInterrupt(digitalPinToInterrupt(INTERRUPT_PIN), isr, RISING);
   delay(2000);
-  Serial.print("\nIf you receive this message, ESP32 module has finished setting up Serial Interface for communication.");
   dmxSetup();
   const dmx_port_t dmx_num = DMX_NUM_1;
+  Serial.println("Welcome to Pupilometer LED Billboard!");
 }
 
 void loop() {
+  
   // Send the DMX packet.
   int modeOld = mode;
+
+  // notify changed value
+  if (deviceConnected) {
+      btmessage = pCharacteristic->getValue().c_str();
+      mode = btmessage.toInt();
+  }
+  // disconnecting
+  if (!deviceConnected && oldDeviceConnected) {
+      delay(500); // give the bluetooth stack the chance to get things ready
+      pServer->startAdvertising(); // restart advertising
+      Serial.println("Start advertising");
+      oldDeviceConnected = deviceConnected;
+  }
+  // connecting
+  if (deviceConnected && !oldDeviceConnected) {
+      // do stuff here on connecting
+      oldDeviceConnected = deviceConnected;
+  }
+
   serialRead();
+
   dmx_send(DMX_NUM_1);
   // Preparing next packet
   if (button1.pressed){