Setting Matter bridge to BLE device

[shin..]

Hello.
Thank you for your support.

I am trying to build a BLE bridge for Matter.
I was able to create the Matter Lock sample and Ble app separately, but I am having trouble figuring out how to connect the Ble app from the Matter Lock sample.

Would it be better to connect Matter and BLE app on two nrf52840dk by connecting them with UART from GPIOs?
Or is it better to build BLE app into Matter sample?

Matter Lock sample:
nrf Connect SDK 2.0.0

BLE smart lock app:
Using ble_app_multirole_lesc_s140_pca10056

Thank you.

[Marte Myrvold]

Hi,

Can you clarify the use case? Do you want to be able to control the Matter door lock using both Matter (over Thread or Wi-Fi) and Bluetooth LE? BLE is used for commissioning in our Matter samples, so the samples have support for BLE out of the box. It should be possible to add other BLE services to the samples as well, so if what you want is to be able to have the door lock be a Matter/BLE device, this should be possible.

If you instead want the door lock to only be a Matter device and want to use a gateway for BLE devices to communicate with the door lock through the gateway, then I would recommend that the gateway is a BLE/Matter device that uses Matter for communication with the door lock, instead of using UART.

Please also be aware that nRF5 SDK is in maintenance mode, so for new development we strongly recommend using nRF Connect SDK, also for BLE.

Best regards,

Marte

[shin..]

Hello.
Thanks for your reply.

What I want is to be able to have the door lock be a Matter/BLE device.
Therefore, I would like to add a BLE service to the sample.

I need a peripheral BLE service which has LESC pairing and UART (NUS?) function. Which BLE sample is appropriate with the nRF Connect SDK?

Also, should the events for locking and unlocking the BLE service be incorporated into the BoltLockManager function on the Matter sample?

Thank you.

[Marte Myrvold]

Hi,

The best start would be to look at the Bluetooth: Peripheral UART sample, which demonstrates how to use the Nordic UART Services (NUS).

For LESC you need to add CONFIG_BT_SMP=y in prj.conf to enable pairing devices over LE. You also need to add several callbacks depending on whether you want to support display, keyboard, accepting/declining bonding, etc. For example:

static struct bt_conn_auth_cb conn_auth_callbacks = {
    .passkey_display = auth_passkey_display,
    .passkey_confirm = auth_passkey_confirm,
    .cancel = auth_cancel,
};

If you look in the Peripheral UART sample you will see that a lot of these callbacks already exists, and depends on CONFIG_BT_NUS_SECURITY_ENABLED being defined.

Best regards,

Marte

[shin..]

Hi Marte,
I could set up LESC. Thank you.
Then I would like to have two more questions.

1. I'd like to send security request from peripheral, so how could I configure it?
2. I'd like to put manufacture data(company ID) to adv data.
    Where can I configure it?

[Marte Myrvold]

Hi,

shin.. said:

1. I'd like to send security request from peripheral, so how could I configure it?

You can use bt_conn_set_security(). Send in the connection object and requested security level as parameters. As an example, this is done in the Peripheral HIDS sample:

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) {
		printk("Failed to connect to %s (%u)\n", addr, err);
		return;
	}

	printk("Connected %s\n", addr);

	if (bt_conn_set_security(conn, BT_SECURITY_L2)) {
		printk("Failed to set security\n");
	}
}

shin.. said:

2. I'd like to put manufacture data(company ID) to adv data.
    Where can I configure it?

You can add this to the advertisement data struct:

static uint8_t mfg_data[] = //put manufacturer data here

static const struct bt_data ad[] = {
	BT_DATA(BT_DATA_MANUFACTURER_DATA, mfg_data, sizeof(mfg_data)),
};

Best regards,

Marte

[shin..]

Hi Marte,
I could build up BLE app with peripheral_UART sample. Thank you.

Then I would like to merge BLE app into Matter door lock sample.
How could I set up?

Shin

[Marte Myrvold]

Hi Shin,

I think the best way to implement this is to look at how SMP is implemented and used in the Matter samples. I started implementing this myself, but I have not been able to test it yet. I will try to test it and get back to you tomorrow.

Best regards,

Marte