Before we can help you, you need to describe the problem. There are many BLE peripheral examples available in our SDK. Most of these are supported on nRF52840 PDK. Please follow the Testing section on each example to try it out. Which example you should use, will depend on what "value" you want to read from the PDK.
i am going to use ble_app_beacon. but there is pca 10040 is available pca 10056 is not available. so i am thinking to use ble_app_blinky. is this the correct example
Again, what example you should use will depend on what data you want to send. ble_app_blinky can be a great place to start, but if you want to develop beacon applicaton, ble_app_beacon is a better starting point. You can find instructions to make the pca10040 ble_app_beacon example work with pca10056 board in this answer. They are written for SDK 13, but should be applicable for SDK 14.x as well.
