title: Looking for open source Bluetooth Stack (HCI) for STM32F4
body: <p>I am new to bluetooth develpoing and i am looking to connect a ST STM32F4 MCU via uart to a bluetooth module.</p>
  
  <p>The MCU will have to have HCI implementation to configue and manage the bluetooth module.</p>
  
  <p>Is there any recommendations about an open source bluetooth stack that implements said HCI on the ST STM32F4?</p>
  
  <p>Thanks!</p>