Hello, i am working on the Light switch proxy server example with SES and i want use TWI driver, and i added the files 
and the path for "nrf_drv_twi.h", i put #include "nrf_drv_twi.h" in the beggining of the main file, and
/* TWI instance ID. */
#define TWI_INSTANCE_ID 0
/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/* Buffer for samples read from temperature sensor. */
static uint8_t m_sample;
(i am using the example "twi_sensor" from nRF5_SDK_15.0 )
however, when i try compile it,
please i need help to use it.
Thanks.
