You are not very specific about how you want to do it. Do you want to send it do a specific peer in a connection or advertise the data? If you want to advertise the data, then you could refer to a peripheral example too see how advertising is done. Note that SDK 15.1 added a new API function to update advertising data (ble_advertising_advdata_update), which is useful if you want to update the advertising data with new sensor readings regularly.
