Where is the function which sets the cccd?

[Mitch996]

Hello, I'm using an android device to set cccd, it worked when I was running the project on nrf514xx @s110, it no longer does on nrf52840 S140, so now I wanna make sure the program actually dont skip the part that sets the cccd.

So where in the library API can I find it? Which switch case? Which API function? I imagine it is a part of a gatt call back somewhere, but I can't quite tell where.

I hope it's not deeply hidden in the SD and it's impossible to locate.

Also, the other question I asked here can provide some more background:

devzone.nordicsemi.com/.../

[endnode]

Hi Mitch, how you describe it this seems to be more Android problem. What radio sniffer trace says? Is android phone really writing proper 16-bit value to CCCD handle? Is it using Write Request not Write Command (which seems to be forbidden by BT SIG spec for writing to CCCD and so Nordic enforces it in their latest soft devices (see this Q&A thread for more))?

Otherwise when it comes to S140 API you should wait for BLE_GATTS_EVT_WRITE and filter it by target handle and value and act accordingly.

[Mitch996]

I'm out of characters, so last but not least:

Otherwise when it comes to S140 API you should wait for BLE_GATTS_EVT_WRITE

You mean it works like this:

Android App fires a cccd write -> triggers my BLE_GATTS_EVT_WRITE branch -> me filter the incoming data according to handle and value etc. -> enters my designated, hand written, self-made cccd enable branch?

That would be again, quite weird, because I don't remember ever written such a branch that specifically enables cccd, I always though it gets handled by SD? Also, wouldn't that defeats the very purpose of getting a request from android device/client in order to enable notification? I mean what stops me from calling such a function arbitrarily as I please, with or without the android request?

So suppose I need to call a function to enable cccd, AFTER I received the android request, what function should I call? static void notif_enable(client_t * p_client)?