S130 potential unstability case

[Fabien Comte]

This code do a test triangle with 3 boards on mbed (using BLE API). I have digged in BLE_API and it looks like if instability was in S130. Have you this kind of test in internal ?

I want to help, do you have a code like that on pure SDK style that i could test ?

link 1: board A is central, board B is device link 2: board B is central, board C is device link 3: board C is central, board A is device

every time a char is received on serial port of a board, it's reported to the serial ports of the 2 other boards connected.

It works not so bad but depending on connections order, some half links are not working.

For the boards that did first connection as central and second as device, both TX are working. For the boards that did first connection as device and second as central, half TX are working.

Characteristics discovery sometimes fails.

code.txt

[Pål Håland]

Hi Fabien, have you stacked all of the boards on top of each other? If so you need to disconnect the serial pins from the stack. ( So that they are not connected between the boards)

[Fabien Comte]

It's tiny ble boards (www.seeedstudio.com/.../Tiny_BLE) connected and powered by usb on a hub. I never lost serial connection to pc, the broken connection is radio test between boards.

[Fabien Comte]

inside write function of nrf5xgattserver.cpp, call of sd_ble_gatts_hvx returns 13313 (decimal)

[Fabien Comte]

13313 is for ERROR_BLEGATTS_SYS_ATTR_MISSING

this is the code in mbed that call function

error_t error = (error_t) sd_ble_gatts_hvx(gapConnectionHandle, &hvx_params); if (error != ERROR_NONE) { switch (error) { case ERROR_BLE_NO_TX_BUFFERS: /* Notifications consume application buffers. The return value can be used for resending notifications. */ case ERROR_BUSY: returnValue = BLE_STACK_BUSY; break;

            case ERROR_INVALID_STATE:
                returnValue = BLE_ERROR_INVALID_STATE;
                break;
                
            case ERROR_BLEGATTS_SYS_ATTR_MISSING:
                printf("%d\r\n", error);
                returnValue = BLE_ERROR_INVALID_STATE;
                break;

            default :
                ASSERT_INT( ERROR_NONE,
                            sd_ble_gatts_value_set(connectionHandle, attributeHandle, &value),
                            BLE_ERROR_PARAM_OUT_OF_RANGE );
                break;
        }
    }

does anyone have an idea how to fix error ?

[Fabien Comte]

a board can notify to central until this board become central too (at the same time as its device role), then the error appears.