Add support for BLE notification (ANS client).

Work In Progress!!!

src/Components/Ble/BleController.cpp

@@ -1,7 +1,13 @@
+#include <cstring>
+#include <cstdlib>
 #include "BleController.h"
 
 using namespace Pinetime::Controllers;
 
+Ble::Ble() {
+  notificationQueue = xQueueCreate(10, sizeof(NotificationMessage));
+}
+
 void Ble::Connect() {
   isConnected = true;
 }
@@ -9,3 +15,25 @@ void Ble::Connect() {
 void Ble::Disconnect() {
   isConnected = false;
 }
+
+void Ble::PushNotification(const char *message, uint8_t size) {
+  char* messageCopy = static_cast<char *>(malloc(sizeof(char) * size));
+  std::memcpy(messageCopy, message, size);
+  NotificationMessage msg;
+  msg.size = size;
+  msg.message = messageCopy;
+
+  BaseType_t xHigherPriorityTaskWoken;
+  xHigherPriorityTaskWoken = pdFALSE;
+  xQueueSendFromISR(notificationQueue, &msg, &xHigherPriorityTaskWoken);
+  if (xHigherPriorityTaskWoken) {
+    /* Actual macro used here is port specific. */
+    // TODO : should I do something here?
+  }
+}
+
+bool Ble::PopNotification(Ble::NotificationMessage& msg) {
+  return xQueueReceive(notificationQueue, &msg, 0) != 0;
+}
+
+

src/Components/Ble/BleController.h

@@ -1,15 +1,29 @@
 #pragma once
 
+#include <FreeRTOS.h>>
+#include <queue.h>
+
 namespace Pinetime {
   namespace Controllers {
     class Ble {
       public:
+        struct NotificationMessage {
+          uint8_t size = 0;
+          const char* message = nullptr;
+        };
+
+        Ble();
         bool IsConnected() const {return isConnected;}
         void Connect();
         void Disconnect();
 
+        void PushNotification(const char* message, uint8_t size);
+        bool PopNotification(NotificationMessage& msg);
+
       private:
         bool isConnected = false;
+        QueueHandle_t notificationQueue;
+
     };
   }
 }