[NUS, Bluetooth] bt_conn

Question

Hello, 
 I am programming BLE with the nRF52840-DK. [Toolchain Manager: v1.3.0, IDE: Visual Studio Code (VSCode), SDK: ncs v2.6.0, window11 pro] 
 I am using NUS to work with Bluetooth. I am programming new code by looking at the examples peripheral_uart and central_uart . I have a question about the variable bt_conn (in 'conn_internal.h') that exists in the examples peripheral_uart and central_uart . 
 
 Is the bt_conn (in 'conn_internal.h') variable the information of the currently connected Bluetooth device, or is it the information of the Bluetooth device that holds this code? ( 
 The code below is the callback function code for connected in peripheral_uart . At this time, info.role is output as peripheral. I am confused whether the function bt_conn_get_info(conn, &info) puts the information of the Bluetooth device connected to conn into info or if it puts the Bluetooth information of conn into info ." static void connected(struct bt_conn *conn, uint8_t err){
	char addr[BT_ADDR_LE_STR_LEN];
	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
	if (err) {
 LOG_INF("connected - connected: Connection failed (err %u)", err);
 return;
	}
	LOG_INF("connected - Connected %s", addr);
	current_conn = bt_conn_ref(conn);
	struct bt_conn_info info = {0};
	err = bt_conn_get_info(conn, &info);
	LOG_INF("connected - bt_conn_get_info >>> err:%d", err);
	LOG_INF("connected - Connected as %s", info.role == BT_CONN_ROLE_CENTRAL ? "central" : "peripheral");
	LOG_INF("connected - Conn. interval is %u units", info.le.interval);
}

static struct bt_conn_cb conn_callbacks = {
	.connected = connected,
	.disconnected = disconnected,
	.security_changed = security_changed,
	.le_param_updated = le_param_updated,
	.le_data_len_updated = le_data_length_updated,
	.le_phy_updated = le_phy_updated,
};