Device Connection count changes

RE: Device Connection count changes

Sigurd — Mon, 08 Feb 2021 18:34:16 GMT

Hi,

[quote user="Venkat RAM"]Kindly note Before the FDS success message my device wants to connect with a single device and ONLY after the fds Success message my device wants to connect with multiple(8) device [/quote]

Yes, I understand, just make sure that you don't start the BLE scanning again when you connect the first device. Only start the scanning again when you get the FDS success message.

RE: Device Connection count changes

Venkat RAM — Fri, 05 Feb 2021 06:12:14 GMT

Hai Sigurd, I will explain my bug in detail

My Nrf52840 should connect with a maximum of only one device and through the one device I will; write some data in FDS and only after the success message from the FDS write operation my nrf52840device able to connect with 8 peripheral devices

Kindly note Before the FDS success message my device wants to connect with a single device and ONLY after the fds Success message my device wants to connect with multiple(8) device

RE: Device Connection count changes

Sigurd — Wed, 03 Feb 2021 13:40:21 GMT

Hi,

Just keep the NRF_SDH_BLE_CENTRAL_LINK_COUNT at 8. If you plan to connect to 8 devices, then you should set this define to 8 from the start.

RE: Device Connection count changes

Venkat RAM — Tue, 02 Feb 2021 07:57:44 GMT

Yes, I am using that same event FDS_EVT_WRITE and start scan again but now how can I change the no of count link,

I had already given as

// <o> NRF_SDH_BLE_CENTRAL_LINK_COUNT - Maximum number of central links.
#ifndef NRF_SDH_BLE_CENTRAL_LINK_COUNT
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 1
#endif

in my sdk_config and

BLE_LBS_C_ARRAY_DEF(m_lbs_c, NRF_SDH_BLE_CENTRAL_LINK_COUNT); /**< LED button client instances. */

BLE_DB_DISCOVERY_ARRAY_DEF(m_db_disc, NRF_SDH_BLE_CENTRAL_LINK_COUNT); /**< Database discovery module instances. */
NRF_BLE_SCAN_DEF(m_scan); /**< Scanning Module instance. */
NRF_BLE_GQ_DEF(m_ble_gatt_queue, /**< BLE GATT Queue instance. */
NRF_SDH_BLE_CENTRAL_LINK_COUNT,
NRF_BLE_GQ_QUEUE_SIZE);

in my main file

now after using the event FDS_EVT_WRITE and scan again ,i dont now how to change the Maximum number of central links. again

RE: Device Connection count changes

Sigurd — Mon, 01 Feb 2021 13:05:04 GMT

[quote user="Venkat RAM"]and after storing the application data I want to connect with multiple links[/quote]

Then maybe you can use the event FDS_EVT_WRITE in the the registered FDS event handler function to start the scanning again.

RE: Device Connection count changes

Venkat RAM — Mon, 01 Feb 2021 07:58:24 GMT

Hai Sigurd, the operations are just saving application data to my FDS via a custom mobile app(Using Bluetooth in mobile) and after storing the application data I want to connect with multiple links

Here, my Conditional case only after storing the application data I should connect with multiple device and While writing the application data in fds, I want to connect with a single device, till now I can't do It kindly help me

RE: Device Connection count changes

Sigurd — Fri, 29 Jan 2021 08:56:11 GMT

Hi,

Scanning is by default stopped when you connect to a device. After you have connected, you get the event BLE_GAP_EVT_CONNECTED. In the ble_app_multilink_central example, the scanner is explicitly started again when handling the BLE_GAP_EVT_CONNECTED event.

You said that after some operations, you want to connect to more peripherals. What are these operations? When these operations are completed, then this is when you need to start the scanner again.

RE: Device Connection count changes

Venkat RAM — Wed, 27 Jan 2021 08:37:38 GMT

Hai Sigurd,
Yes, I am using ble_app_multilink_central fro testing with 16.X.X SDK along with PCA10056

my need was my central connect with a single peripheral, and after some operation, my sensor need to connect with multiple peripheral (which is 8 links),

The function ble_conn_state_central_conn_count() returns the count of link with peripherals, kindly help me

Thanks in advance

RE: Device Connection count changes

Sigurd — Mon, 25 Jan 2021 09:01:36 GMT

Hi,

What SDK version are you using ? What example are you testing? Is it ble_app_multilink_central?

You should set NRF_SDH_BLE_CENTRAL_LINK_COUNT to the max number of devices you want to connect to at the same time.

If you don't want to connect to a new device right after connecting to the first device, you need make sure that you don't resume scanning in the handling of the BLE_GAP_EVT_CONNECTED event in ble_evt_handler().

[quote user=""]and after certain operations, I want to connect central to more peripherals[/quote]

Then after certain operations, you call scan_start(). You can check how many devices you are connect to with ble_conn_state_central_conn_count().