This example is much spoken of but turns out to be a bugger to find. It is not kept with the rest of Nordic’s example software but on github at https://github.com/NordicSemiconductor/nrf51-ble-app-lbs .
It’s quite involved to get this app compiled, and it is described in “Creating Bluetooth Low Energy Applications Using nRF51822 aka nAN-36.
The software is tested using the Master Control Panel. The MCP talks to a dongle that has to be pre-loaded with an emulator called the MEFW (Master Emulator Firmware?). The firmware is loaded using the MCP itself. All of these components are obtained here.
Once the MCP package is downloaded and installed the MEFW is loaded like this: