nRF9160 DK: lte_ble_gateway example project: Does this project allow more than one BLE connection simultaneously?

[CoryJPAE]

Hi,

As the title asks, I am using the lte_ble_gateway example project on the nRF9160 DK. I am able to connect one nRF52840 DK to the nRF9160 DK over BLE. I am trying to connect a second nRF52840 DK to the nRF9160 DK, but am having issues. Is this possible? If not, could I be pointed to a sample project that would allow simultaneous BLE connections?

Any help would be appreciated.

Thank you!

[Hakon]

Hey, I don't know any sample project that uses multiple connections, but it should be possible to configure the project to use multiple connections since it is a standard Zephyr BT project.

[Hakon]

One way of doing it is to add bt_scan_start() to the connected callback, at least that worked for me.

static void connected(struct bt_conn *conn, u8_t conn_err)
{
	int err;
	char addr[BT_ADDR_LE_STR_LEN];

	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));

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

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

	err = bt_gatt_dm_start(conn, BT_UUID_TMS, &discovery_cb, NULL);
	if (err) {
		printk("Could not start service discovery, err %d\n", err);
	}
	bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
}

[CoryJPAE]

Hi Hakon,

Thank you for the response. I implemented the above with a fresh lte_ble_gateway project, but I receive after the first peer connects, which indicates there is a low level error within the callback:

Connecting to...Connected: e4:dd:a0:xx:xx:xx (random)
Connecting to...Connection to peer failed!

OR

Connecting to...Connected: d9:21:67:xx:xx:xx (random)
Connecting to...Connection to peer failed!

Depending on which of the two nRF52840 DKs connects first.

[Hakon]

And you have changed the scan filter so it accepts the connection from the DK?

[CoryJPAE]

Yes, I have added a second UUID via bt_scan_filter_add(...) and it successfully adds the filter within scan_start(...).