title: Bluetooth HM-10 PIN to connect, Authentication / Security
body: <p>I am using a HM10 Bluetooth - UART module in my embedded Device. I connect to it via the UUID with an iPhone App, but I would like to activate a PIN to connect for the first time, so that not everybody with an iPhone and a App like LightBlue or something like that, can send data to my device.
  Is this somehow possible with the HM10? In the manual is written, that it is possible to use a PIN to pair, but even if I activate this, I didn't need to enter this.</p>
  
  <p>Thank you</p>