Device Connection count changes

[Venkat RAM]

Hai, I want to connect central to a single  peripheral   and after certain operations, I want to connect central to more peripherals

1. I tried with,

                          #define NRF_SDH_BLE_CENTRAL_LINK_COUNT 1

                           and after some operations, I had changed  to

                           #define NRF_SDH_BLE_CENTRAL_LINK_COUNT 8

                          but  my device (central) connecting to a single peripheral only not with many periphral

         2. even i tried with

                          #define NRF_SDH_BLE_CENTRAL_LINK_COUNT 8

                           BLE_LBS_C_ARRAY_DEF(m_lbs_c, NRF_SDH_BLE_CENTRAL_LINK_COUNT); 
                           BLE_DB_DISCOVERY_ARRAY_DEF(m_db_disc, NRF_SDH_BLE_CENTRAL_LINK_COUNT); 
                           NRF_BLE_SCAN_DEF(m_scan); 
                           NRF_BLE_GQ_DEF(m_ble_gatt_queue, NRF_SDH_BLE_CENTRAL_LINK_COUNT,NRF_BLE_GQ_QUEUE_SIZE);

and after some operations, I had changed  to

                          #define NRF_SDH_BLE_CENTRAL_LINK_COUNT 8

                          BLE_LBS_C_ARRAY_DEF(m_lbs_c, NRF_SDH_BLE_CENTRAL_LINK_COUNT); 
                          BLE_DB_DISCOVERY_ARRAY_DEF(m_db_disc, NRF_SDH_BLE_CENTRAL_LINK_COUNT); 
                          NRF_BLE_SCAN_DEF(m_scan); 
                          NRF_BLE_GQ_DEF(m_ble_gatt_queue, NRF_SDH_BLE_CENTRAL_LINK_COUNT,NRF_BLE_GQ_QUEUE_SIZE);

But  i getting error  like, " Initializer element is not a constant"

 Kindly help me, thank you

[Sigurd]

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().

 

and after certain operations, I want to connect central to more peripherals

 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().

[Venkat RAM]

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

[Sigurd]

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.

[Venkat RAM]

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

[Sigurd]

Venkat RAM said:

and after storing the application data  I want to connect with multiple links

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