I can't understand concept of control point..

RE: I can't understand concept of control point..

JoonDong — Thu, 16 Feb 2017 01:35:07 GMT

Of course. Thank you for your help.

RE: I can't understand concept of control point..

Petter Myhre — Wed, 15 Feb 2017 15:45:21 GMT

Great! Then maybe you can accept my answer?

RE: I can't understand concept of control point..

JoonDong — Wed, 15 Feb 2017 15:15:32 GMT

I've understood control point through analyzing location and navigation service.

RE: I can't understand concept of control point..

Petter Myhre — Wed, 15 Feb 2017 13:58:44 GMT

Yes, the value will be saved.

RE: I can't understand concept of control point..

JoonDong — Tue, 14 Feb 2017 10:04:22 GMT

Yes, it is. If a server get a write event about control point when a client send it, does the server extract relevant data in ble_evt_t type p_ble_evt->gatts_evt.write.data[x], then use these data in <if/else statement> and so on.. to determine that whether to perform any codes, not save in control point attribute value?

RE: I can't understand concept of control point..

Petter Myhre — Mon, 13 Feb 2017 11:49:57 GMT

Data received? Do you mean when a client writes to the attribute? Then the application on the server side will get a write event telling it that the attribute has been written to. Then it can react to the this event, but I guess it can also read it later. What is used in user code? I don't understand.

RE: I can't understand concept of control point..

JoonDong — Mon, 13 Feb 2017 11:17:59 GMT

Does it means that any data received using control point attribute handle is used promptly, not saved in attribute value? Then are these used in user code, for example in if statements?

RE: I can't understand concept of control point..

Petter Myhre — Mon, 13 Feb 2017 10:20:19 GMT

A characteristic value could be a control point attribute, which per Bluetooth Core Specification 5.0, Vol 3, Part F, Section 3.2.6 is:

Attributes that cannot be read, but can only be written, notified or indicated arecalled control-point attributes. These control-point attributes can be used by higher layers to enable device specific procedures, for example the writing of a command or the indication when a given procedure on a device has completed.

You heard correct, and it is right.

Let me know if anything is still unclear.