Nordic Developer Academy BLE NUS Example with Pairing and Bonding: various problems

[Andreas Schurz]

Hi Support Team,

I am encountering various problems with the Developer Academy example found here:

https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-4-bluetooth-le-data-exchange/topic/blefund-lesson-4-exercise-3/

1. Unable to debug without GATT errors

To overcome this issue I used logging but:

2. Logging is not working. None of the LOG directives is working

The cause why I need this is:

3. I set CONFIG_BT_NUS_SECURITY_ENABLED=y but nothing happend - security is not working

Could you tell me at least how to get the security in the example working?

Also logging is needed

Many thanks in advance.

Regards, Andreas

[helsing]

Could you tell me at least how to get the security in the example working?

For guidance setting up security (pairing and bonding), I would recommend checking out Lesson 5 – Security in Bluetooth LE communication.

If you have specific questions as you work through these excercises, feel free to reach out, and we'll be happy to assist further.

[Andreas Schurz]

Hi Helsing,

I have indeed also done the lesson 5.

The security implementation is already in the course example and can be activated by setting CONFIG_BT_NUS_SECURITY_ENABLED=y

Code-Snipped - already within the code:

#ifdef CONFIG_BT_NUS_SECURITY_ENABLED
static void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err 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("Security changed: %s level %u", addr, level);
	}
	else
	{
		LOG_WRN("Security failed: %s level %u err %d", addr, level, err);
	}
}
#endif

So I set this parameter and the security implementation is not working.

Could you advise me how to make it work?

Many thanks so far.

Regards, Andreas

[helsing]

Thank you for the feedback. I will get back to you tomorrow.

[helsing]

Andreas Schurz said:

The security implementation is already in the course example and can be activated by setting CONFIG_BT_NUS_SECURITY_ENABLED=y

Code-Snipped - already within the code:

Fullscreen

One trick is to add a warning in your project, withing the ifdef for the kconfig that you are intending to use. That way the string you enter next to #warning will be printed when you build the code, only if that kconfig is active. See an example below:

#ifdef CONFIG_BT_NUS_SECURITY_ENABLED
#warning "Verifying that BT_NUS_SECURITY_ENABLED is enabled."
static void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err 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("Security changed: %s level %u", addr, level);
	} else {
		LOG_WRN("Security failed: %s level %u err %d", addr, level, err);
	}
}
#endif

[Andreas Schurz]

Warning comes up then for me

D:/bt-fund/lesson4/blefund_less4_exer3_solution/src/main.c:357:2: warning: #warning "Verifying that BT_NUS_SECURITY_ENABLED is enabled." [-Wcpp]
  357 | #warning "Verifying that BT_NUS_SECURITY_ENABLED is enabled."