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Original question:

CC2640R2F: What is the use of the maximum connection number of MAX_NUM_BLE_CONNS of the slave？

CC2652R7: Reducing the Number of Max Connections causing problems

Kenneth Thomas
Intellectual 260 points

Part Number: CC2652R7
Other Parts Discussed in Thread: SYSCONFIG

Good Afternoon,

    So when I try reducing the number of maximum connections I can't find the device anymore in any BLE app. Is there anything I need to change when reducing the number of maximum connections? I'm using SDK:7_10_01_24 and using project zero.

Regards,
Kenneth Thomas

  • 0
    TI__Genius 16825 points

    Hello Kenneth,

    Thanks for reaching out.

    Where are you modifying the max number of connection parameters?

    You can try changing this using sysconfig. I think by default this parameter is set to 2 in project zero. When set to 1 the SimpleLink Connect app can still successfully discover it and generate a connection, as expected.

    Hope this helps.

    David.

  • 0 in reply to David
    Intellectual 260 points

    Hey David,

    I was also able to connect to the device however, once I disconnected from the device and tried to reconnect I wasn't able to rediscover the device unless I reset it.

    Regards,
    Kenneth

  • +1 in reply to Kenneth Thomas
    TI__Genius 16825 points

    Hello Kenneth,

    I see, this is happening for 1 connection because advertisement is not being enabled again after a connection has been established. You can see this inside project_zero.c, specifically the ProjectZero_processGapMessage function. I would suggest adding the following evaluation inside the GAP_LINK_TERMINATED_EVENT case.

    case GAP_LINK_TERMINATED_EVENT:
{
    gapTerminateLinkEvent_t *pPkt = (gapTerminateLinkEvent_t *)pMsg;

    // Display the amount of current connections
    Log_info0("Device Disconnected!");
    Log_info1("Num Conns: %d", linkDB_NumActive());

    if(linkDB_NumActive() < MAX_NUM_BLE_CONNS)
    {
        // Start advertising since there is room for more connections
        GapAdv_enable(advHandleLegacy, GAP_ADV_ENABLE_OPTIONS_USE_MAX, 0);
    }
. 
.
.

    Please let me know if that helps.

    David.

  • 0 in reply to David
    Intellectual 260 points

    Thanks, David! That fixed the issue.