added ble arduino sketch

Arduino/OmobiDisplay/OmobiDisplay.ino

@@ -0,0 +1,160 @@
+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLEUtils.h>
+#include <BLE2902.h>
+
+BLECharacteristic *pCharacteristic;
+bool deviceConnected = false;
+float txValue = 0;
+const int readPin = 32; // Use GPIO number. See ESP32 board pinouts
+const int LED = 2; // Could be different depending on the dev board. I used the DOIT ESP32 dev board.
+
+//std::string rxValue; // Could also make this a global var to access it in loop()
+
+// See the following for generating UUIDs:
+// https://www.uuidgenerator.net/
+
+#define SERVICE_UUID           "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
+#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
+#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
+
+
+#include <Adafruit_GFX.h>
+#include <Adafruit_NeoMatrix.h>
+#include <Adafruit_NeoPixel.h>
+
+#define PIN 4
+
+TaskHandle_t Task1;
+
+Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, 2, 1, PIN,
+                            NEO_TILE_TOP   + NEO_TILE_LEFT   + NEO_TILE_ROWS   + NEO_TILE_PROGRESSIVE +
+                            NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS + NEO_TILE_PROGRESSIVE,
+                            NEO_GRB + NEO_KHZ800);
+
+
+const uint16_t colors[] = {
+  matrix.Color(255, 0, 0), matrix.Color(0, 255, 0), matrix.Color(0, 0, 255) };
+
+void Task1code();
+
+int x    = matrix.width();
+int pass = 0;
+String scroll_text = "This is a test !!!";
+
+void sendMessage(std::string message) {
+  
+        pCharacteristic->setValue(message); // Sending a test message
+//    pCharacteristic->setValue(txString);
+    
+        pCharacteristic->notify(); // Send the value to the app!
+}
+
+class MyServerCallbacks: public BLEServerCallbacks {
+    void onConnect(BLEServer* pServer) {
+      deviceConnected = true;
+    };
+
+    void onDisconnect(BLEServer* pServer) {
+      deviceConnected = false;
+    }
+};
+
+class MyCallbacks: public BLECharacteristicCallbacks {
+    void onWrite(BLECharacteristic *pCharacteristic) {
+      std::string rxValue = pCharacteristic->getValue();
+
+      if (rxValue.length() > 0) {
+        Serial.println("*********");
+        Serial.print("Received Value: ");
+        Serial.println(rxValue.c_str());
+        Serial.println("*********");
+
+        scroll_text = String(rxValue.c_str());
+
+        sendMessage(rxValue);
+      }
+    }
+};
+
+void Task1code( void * pvParameters ) {
+  uint32_t color = 0;
+  for (;;) {
+    matrix.fillScreen(0);
+    matrix.setCursor(x, 0);
+    matrix.print(scroll_text.c_str());
+    if (--x < (int)(-6 * scroll_text.length())) {
+      x = matrix.width();
+      if (++pass >= 3) pass = 0;
+      matrix.setTextColor(colors[pass]);
+    }
+
+    
+    matrix.drawPixel(0,0,color);
+    color = color<matrix.Color(255,255,255)?color+1:0;
+
+    portDISABLE_INTERRUPTS();
+    matrix.show();
+    portENABLE_INTERRUPTS();
+    delay(100);
+  }
+}
+
+
+void setup() {
+  Serial.begin(115200);
+
+  // Create the BLE Device
+  BLEDevice::init("ESP32 Chat Test"); // Give it a name
+
+  // Create the BLE Server
+  BLEServer *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_TX,
+                      BLECharacteristic::PROPERTY_NOTIFY
+                    );
+                      
+  pCharacteristic->addDescriptor(new BLE2902());
+
+  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
+                                         CHARACTERISTIC_UUID_RX,
+                                         BLECharacteristic::PROPERTY_READ |
+                                         BLECharacteristic::PROPERTY_WRITE
+                                       );
+                                       
+  pCharacteristic->setCallbacks(new MyCallbacks());
+
+  // Start the service
+  pService->start();
+
+  // Start advertising
+  pServer->getAdvertising()->addServiceUUID(pService->getUUID());  
+  pServer->getAdvertising()->setScanResponse(true);
+  pServer->getAdvertising()->setMinPreferred(0x06);  // functions that help with iPhone connections issue
+  pServer->getAdvertising()->setMinPreferred(0x12);
+  pServer->getAdvertising()->start();
+  Serial.println("Waiting a client connection to notify...");
+
+  
+
+  matrix.begin();
+  matrix.setTextWrap(false);
+  matrix.setBrightness(40);
+  matrix.setTextColor(colors[0]);
+  
+  xTaskCreatePinnedToCore(Task1code, "Task1", 10000, NULL, 1, &Task1, 0);
+}
+
+void loop() {
+  if (deviceConnected) {
+    sendMessage("PING");
+  }
+  delay(1000);
+  
+}