Deigning BLE sensor Network

Question

I want to extend the ble_app_multilink_central for pca10028 Example to be able to communicate with a sensor via SPI and then initiate a connection with another pca10028.
but I have a problem with the SPI driver, after testing i found out that this function bsp_configuration() stops the program from executing. 
 in another attempt to solve the problem i tried to make this example spi_master_with_spi_slave as my template. it is a peripheral example that doesn't require a softdevice but when i tried to program the SoftDevice first (because i will need it later for designing the NW) but then while flashing the program i get Error in Keil: Flash download Failed cortex M0 and i cant figure out the reason for that.

Petter Myhre · Accepted Answer

If you are a beginner in BLE I strongly suggest you don't start with a central example, but a peripheral example. For example ble_app_hrs, ble_app_uart or ble_app_template, with the S110 SoftDevice. Usually it is the peripheral that has the sensor connected to it, and sends the data to the central device. 
 Why a peripheral? A peripheral only has one connection to one central. We have more examples for peripherals. There is better access to centrals to test with, Master Control Panel for PC, nRF Master Control Panel for Android and so on. 
 You should be in a connection if you want to send data, the peripheral advertises and the central scans. If the central sees and attractive advertising packet it sends a connection request, and they make a connection. Then the central discovers what services and characteristics(these contain your data) that are available on the peripheral. Then the peripheral can send data to the central. The central can also send data to the peripheral. Examine how this is implemented in our examples. 
 This and this may be helpful to you.