DSPS and I2C sensor code

// My application is => SERVER profile reads data from I2C sensor and sends to CLIENT profile and CLIENT profile sends data via UART

int sample128_timer_handler(ke_msg_id_t const msgid,
struct gapm_cmp_evt const *param,
ke_task_id_t const dest_id,
ke_task_id_t const src_id)
{

ke_timer_set(APP_SAMPLE128_TIMER,TASK_APP,300); // Adv.delay => 50 -> 0.5s , 100 -> 1s , 300 -> 3s

Read_from_sensor(); // Reads data from I2C sensor

struct sample128_upd_char2_req *req = KE_MSG_ALLOC(
SAMPLE128_UPD_CHAR2_REQ,
TASK_SAMPLE128,
TASK_APP,
sample128_upd_char2_req
);
//req->val = sample128_placeholder;
//memcpy(&req->val,&sample128_placeholder,sizeof(sample128_placeholder));
memcpy(&req->val_1,&SensorData,sizeof(SensorData)); // sends sensor data via BLE
req->conhdl = app_env.conhdl;
ke_msg_send(req);
}
I have created custom profile that reads data from my sensor via I2C , using - sample128_After section 7.3.6 - project , and its working fine , i can see the data in android app .

Q1 : If i put the same Read_from_sensor(); code inside the DSPS device project , code stopping at line - WAIT_FOR_RECEIVED_BYTE();

i have tried with in functions -void user_ble_pull (bool init, bool success) ->code stopping at - WAIT_FOR_RECEIVED_BYTE();
-void user_send_ble_data(const uint8_t *data,uint16_t length) ->code stopping at - WAIT_FOR_RECEIVED_BYTE();
could you please help me with this issue...