Hi,
My name is Asanka. I am a proficient C/C++ developer. I have worked with BLE technology before. I have a passion for embedded device programming, however I haven't done much in last couple of years.
As far as I understand from your project description you want to connect your sensor device to ouside world using the BLE module. And you already have scripts doing so. Therefore I assume the interaction of sensors, getting data back and forth, communication protocols all are figured out. The project is to re-code it using C or C++ for better efficiency. You have mentioned the tools that are going to be used int the development process. Not sure what debuggers you are planning to use.
I am very interesting about this project and hope we can discuss more about this.
Thanks.
Asanka