title: How to connect bluetooth devices via A4 protocol in IOS?
body: <p>I am working on connectivity of bluetooth device and for encoding and decoding I have to use protobuf. The bluetooth devices are A4 protocal supported.</p>
  
  <p>After dragging 'google" &amp; 'Proto' folder, xcode is throwing multiple error.</p>
  
  <p>like "#include  File not found" but the file is already there in project.</p>
  
  <p>As most of the codes are written in C++.</p>
  
  <p>I tried all possible senario to fix these but unable to fix the errors.</p>
  
  <p>So, Anyone can share a working sample or the solution to fix the issue will be really helpful.</p>
  
  <p>Also If there is any other way to connect and retrive data from external devices, please feel free to share.
  Thanks in advance.  </p>