bluetooth: nrf52: Set timeout value for connection

The timeout of scan parameters is used as the connection timeout
in BLE board.
Because the timeout value is set to 'infinitely'(timeout does not occur)
in scan start timing, the connection timeout setting is also 'infinitely'
without change.
So, modify this timeout value to finite value to avoid that application
waits connection infinitely.

sdk/modules/bluetooth/hal/nrf52/ble_gap.c

@@ -109,6 +109,13 @@ extern int bleConvertErrorCode(uint32_t errCode);
 #define SLAVE_LATENCY                   0
 #define SUPERVISION_TIMEOUT             MSEC_TO_UNITS(4000, UNIT_10_MS)
 
+/* Connection timeout value. unit : 10msec.
+ * After this timeout value has elapsed since sd_ble_gap_connect() API is
+ * executed, the connection timeout event occurs.
+ */
+
+#define CONNECTION_TIMEOUT              1000
+
 /* Flash handle key name size */
 #define FLASH_KEY_NAME_SIZE      4
 #define FLASH_KEY_NAME_2         2
@@ -698,6 +705,17 @@ int BLE_GapConnect(BLE_GapAddr *addr)
     return -EINVAL;
   }
 
+  /* The timeout of scan parameters is used as the connection timeout
+   * in BLE board.
+   * Because the timeout value is set to 'infinitely'(timeout does not occur)
+   * in scan start timing, connection timeout setting is also 'infinitely'
+   * without change.
+   * So, modify this timeout value to finite value to avoid that
+   * application wait connection infinitely.
+   */
+
+  gapMem.scanParams.timeout = CONNECTION_TIMEOUT;
+
   gapMem.connParams.min_conn_interval = MIN_CONNECTION_INTERVAL;
   gapMem.connParams.max_conn_interval = MAX_CONNECTION_INTERVAL;
   gapMem.connParams.slave_latency = SLAVE_LATENCY;