samples: ble_nus_central: add missing addr scan filter code

The Kconfig options for address scan filter was there, but the
code to set it up was missing. Add the missing bits.

Change print format for logging the address of a connected peer
device. Invert the bytes to correctly print the address and add
colons.

Signed-off-by: Andreas Moltumyr <andreas.moltumyr@nordicsemi.no>

Author: anhmolt

samples/bluetooth/ble_nus_central/src/main.c

@@ -66,6 +66,18 @@ static uint16_t ble_nus_max_data_len = BLE_NUS_CLIENT_MAX_DATA_LEN_CALC(BLE_GATT
 static uint8_t uarte_rx_buf[CONFIG_SAMPLE_NUS_CENTRAL_UART_RX_BUF_SIZE][2];
 static int buf_idx;
 
+#if defined(CONFIG_SAMPLE_USE_TARGET_PERIPHERAL_ADDR)
+/* Target peripheral address (little-endian). */
+static const uint8_t target_periph_addr[BLE_GAP_ADDR_LEN] = {
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR) & 0xff,
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR >> 8) & 0xff,
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR >> 16) & 0xff,
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR >> 24) & 0xff,
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR >> 32) & 0xff,
+	(CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR >> 40) & 0xff,
+};
+#endif /* CONFIG_SAMPLE_USE_TARGET_PERIPHERAL_ADDR */
+
 /* Forward declaration. */
 static void scan_start(void);
 
@@ -267,12 +279,12 @@ static void on_ble_scan_evt(const struct ble_scan_evt *scan_evt)
 		break;
 
 	case BLE_SCAN_EVT_CONNECTED:
-		const ble_gap_evt_connected_t *connected = scan_evt->connected.connected;
-		/** Scan is automatically stopped by the connection. */
-		LOG_INF("Connecting to target %02x%02x%02x%02x%02x%02x",
-			connected->peer_addr.addr[0], connected->peer_addr.addr[1],
-			connected->peer_addr.addr[2], connected->peer_addr.addr[3],
-			connected->peer_addr.addr[4], connected->peer_addr.addr[5]);
+		const ble_gap_addr_t *const peer_addr = &scan_evt->connected.connected->peer_addr;
+
+		/* Scan is automatically stopped by the connection. */
+		LOG_INF("Connecting to target %02X:%02X:%02X:%02X:%02X:%02X",
+			peer_addr->addr[5], peer_addr->addr[4], peer_addr->addr[3],
+			peer_addr->addr[2], peer_addr->addr[1], peer_addr->addr[0]);
 		break;
 
 	case BLE_SCAN_EVT_SCAN_TIMEOUT:
@@ -515,6 +527,17 @@ static uint32_t scan_init(void)
 	}
 #endif /* CONFIG_SAMPLE_USE_TARGET_PERIPHERAL_NAME */
 
+#if defined(CONFIG_SAMPLE_USE_TARGET_PERIPHERAL_ADDR)
+	filter_data.addr_filter.addr = target_periph_addr;
+	filter_mode_mask |= BLE_SCAN_ADDR_FILTER;
+
+	nrf_err = ble_scan_filter_add(&ble_scan, BLE_SCAN_ADDR_FILTER, &filter_data);
+	if (nrf_err) {
+		LOG_ERR("nrf_ble_scan_filter_add address failed, nrf_error %#x", nrf_err);
+		return nrf_err;
+	}
+#endif /* CONFIG_SAMPLE_USE_TARGET_PERIPHERAL_ADDR */
+
 	nrf_err = ble_scan_filters_enable(&ble_scan, filter_mode_mask, false);
 	if (nrf_err) {
 		LOG_ERR("Failed to enable scan filters, nrf_error %#x", nrf_err);