If I have a sample project opened, how am I supposed to determine which soft device it is expecting? I can't find any definition or readme on this.
Here is a link for the nRF51 compatibility matrix.
Also, you will find compatible softdevice hex file inside each SDK, e.g. under \nRF51_SDK_9.0.0_2e23562\components\softdevice\
This thread explains the purpose of different softdevices. In addition, S130 is a BLE peripheral+central softdevice
Here is a link for the nRF51 compatibility matrix.
Also, you will find compatible softdevice hex file inside each SDK, e.g. under \nRF51_SDK_9.0.0_2e23562\components\softdevice\
This thread explains the purpose of different softdevices. In addition, S130 is a BLE peripheral+central softdevice