Double notifications on multilink example with custom service

RE: Double notifications on multilink example with custom service

Vidar Berg — Thu, 21 Jan 2021 10:01:59 GMT

Hello Quentin,

Glad to hear that my answer made sense, thank you for the update.

Best regards,

Vidar

RE: Double notifications on multilink example with custom service

Quentin CAVAN — Thu, 21 Jan 2021 09:58:40 GMT

Hello Vidar,

Thank you for this very clear answer.

Indeed, the number of connections I pass to my BLE_<SERVICE>_ARRAY_DEF is 2 in this case, which explains what I called "double notifications" earlier.

This answers to my question. And I will use the solution you suggested.

Best regards,

Quentin

RE: Double notifications on multilink example with custom service

Vidar Berg — Wed, 20 Jan 2021 14:52:48 GMT

Hello,

ble_customservice_c_on_ble_evt() will get called once for every instance of your service event structure, and the p_context pointer will get updated between calls to point to the current event structure. The number of service instances are defined by number of connections you pass to your BLE_<SERVICE>_ARRAY_DEF macro, which I assume is 2 in this case.

In other words, a single BLE_GATTC_EVT_HVX event will cause your ble_customservice_c_on_ble_evt() to get called twice when you have 2 instances of the service.

The solution I would suggest is that you add a filter in your ble_customservice_c_on_ble_evt() function to make it return if p_context->conn_handle is different from p_context->conn_handle.

Best regards,

Vidar