RTOS/LAUNCHXL-CC26X2R1: Can't connect to peripheral (Project Zero) after reaching maximum number of connections and disconnecting one or more devices.

Arthur Crippa Búrigo

Tool/software: TI-RTOS

Hello!

I'm facing a problem where I can't connect to a CC26X2R1 Launchpad Rev. 1.0.1 running Project Zero from simplelink_cc26x2_sdk_2_20_00_36 after having reached the maximum number of connections and having closed 1 or more of the connections.

Steps to Reproduce

Setup:

Take a CC26X2R1 Launchpad Rev. 1.0.1;
Open Project Zero from simplelink_cc26x2_sdk_2_20_00_36;
Modify MAX_NUM_BLE_CONNS to 2 (since I don't have 8 devices available to connect);
Build and Flash the CC26X2R1 Launchpad Rev. 1.0.1 (from step 1);

Experiment:

Connect MAX_NUM_BLE_CONNS (in my case, 2) devices to your CC26X2R1 Launchpad Rev. 1.0.1 running Project Zero from simplelink_cc26x2_sdk_2_20_00_36;
Disconnect one of the connected devices (observe that the CC26X2R1 Launchpad Rev. 1.0.1 does not start advertising again);
Try to reconnect to the CC26X2R1 Launchpad Rev. 1.0.1 (Connection fails, even though the device has less than MAX_NUM_BLE_CONNS connections).

How can I solve this problem? Is this a problem in the Bluetooth Stack or is it a problem in Project Zero?

over 7 years ago

0 Evan W over 7 years ago

TI__Mastermind 40420 points

Hi,

Were you connected via a serial terminal? The out of the box project zero, once you’ve connected the max number and disconnected one, you need to tell the device to re-enable advertising via the serial terminal menu that the project prints over a COM port.

0 Leoni Mota Loris over 7 years ago in reply to Evan W

Expert 1225 points

Aren't you talking about the Simple peripheral project? The project zero does not display any menu via serial whatsoever. It shows logs instead.

0 Arthur Crippa Búrigo over 7 years ago in reply to Evan W

Intellectual 455 points

Yes. I was connected via a serial terminal to the board. The only thing I see there is a log. Something like the following:

#000001 [ 0.098 ] INFO: (led_service.c:221) Registered service, 5 attributes, status 0x00
#000002 [ 0.098 ] INFO: (button_service.c:260) Registered service, 7 attributes
#000003 [ 0.099 ] INFO: (data_service.c:239) Registered service, 6 attributes
#000004 [ 0.100 ] INFO: (project_zero.c:684) Registered OAD Service
#000005 [ 0.100 ] INFO: (project_zero.c:2906) Left button not held under boot, not reverting to factory.
#000006 [ 0.100 ] INFO: (project_zero.c:2908) Right+Left button not held under boot, not erasing external flash.
#000007 [ 0.100 ] INFO: (project_zero.c:702) OAD Image v0001
#000008 [ 0.100 ] INFO: (led_service.c:237) Registered callbacks to application. Struct @20002720
#000009 [ 0.100 ] INFO: (button_service.c:278) Registered callbacks to application. Struct @20002710

...

0 Evan W over 7 years ago in reply to Arthur Crippa Búrigo

TI__Mastermind 40420 points

Hi Arthur,

Try adding the following to the GAP_LINK_TERMINATED_EVENT in project_zero.c::ProjectZero_processGapMessage()

        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);
        }

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RTOS/LAUNCHXL-CC26X2R1: Can't connect to peripheral (Project Zero) after reaching maximum number of connections and disconnecting one or more devices.