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Re: BLE central device as GATT server
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Re: BLE central device as GATT server

  • Subject: Re: BLE central device as GATT server
  • From: András Kövi <email@hidden>
  • Date: Mon, 11 Nov 2013 16:25:36 +0100
You're welcome. I also learn a lot from such conversations. :)


2013/11/11 Walter Stephan <email@hidden>
András, thanks for being patient and explaining this to me!

So the answer to my original question is that iOS cannot act as a (proprietary) GATT server while in a Central role.
(I was confused because from the nRF8001, I was able to connect to the Time Service published by iOS.)

You are right that the nRF8001 cannot scan or initiate a connection.

In conclusion, I will have to implement my functionality as a service on the accessory.

Best regards,
--Stephan Walter


> Even thought the specification may allow you to create a GATT server on
> the central side (as I understood it from the specifiaction), the iOS
> Core Bluetooth does not provide this functionality. The DB is tied to
> the CBPeripheraManager which is the peripheral role. At the same time
> "The nRF8001 is a pure BLE Peripheral device, and it can not be used as
> a Central." (https://devzone.nordicsemi.com/index.php/can-the-nrf8001-
> be-used-as-a-central) So I suppose the nRF8001 cannot scan for devices
> or start a connection. As a consequence, it is not able to connect to
> the GATT server implemented by the CBPeripheralManager.
>
> So what you can do:
> - the mRF8001 must advertise
> - the iOS device must scan for the nRF8001
> - the iOS device must connect the nRF8001 and discover its services.
>
> At this point it's up to you how you implement the communication. It is
> possible to have a single service with a single characteristic on the
> nRF8001 side and implement a higher level protocol that implements a
> database in a GATT serverish way. This is not preferred for several
> reasons (this is not the usual way of doing things and you lose most of
> the optimizations provided by the underlying stacks) but it's your
> choice.

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References: 
 >BLE central device as GATT server (From: Walter Stephan <email@hidden>)
 >Re: BLE central device as GATT server (From: András Kövi <email@hidden>)
 >AW: BLE central device as GATT server (From: Walter Stephan <email@hidden>)
 >Re: BLE central device as GATT server (From: John Earl <email@hidden>)
 >AW: BLE central device as GATT server (From: Walter Stephan <email@hidden>)
 >Re: BLE central device as GATT server (From: András Kövi <email@hidden>)
 >AW: BLE central device as GATT server (From: Walter Stephan <email@hidden>)
 >Re: BLE central device as GATT server (From: András Kövi <email@hidden>)
 >AW: BLE central device as GATT server (From: Walter Stephan <email@hidden>)

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