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Re: BLE Write Command while Write Request is pending
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Re: BLE Write Command while Write Request is pending

  • Subject: Re: BLE Write Command while Write Request is pending
  • From: András Kövi <email@hidden>
  • Date: Mon, 03 Feb 2014 15:35:03 +0100
You use the CBCharacteristicWriteWithResponse flag. It blocks all communication until the server sends some response. This is probably a consequence of the way the API is designed: all requests must be responded inside the appropriate callback on the peripheral manager side. There is no way to defer processing or send response later.

Actually, this is something that may require some adjustment on the API side as there are cases when the response is ignored by the framework which causes disconnection. Also, your use case is clearly not supported currently.

Regards,
Andras


2014-02-03 Walter Stephan <email@hidden>:
Hi all,

The Bluetooth specification says:

Version 4.0, Vol 3, Part F, section 3.3.2:

"It is possible for a server to receive a request and then a command before responding to the original request. The flow control of requests is not affected by the transmission of commands."

We are trying to use this like so:
The iOS app is acting as a GATT client. We first send a Write Request (CBCharacteristicWriteWithResponse) and then send one or several Write Commands (CBCharacteristicWriteWithoutResponse) before the GATT server sends either a Write Response or an Error Response.

What we are seeing is that iOS seems to queue up the Write Commands and it only puts them on the air after it got a response.

Has anyone encountered the same problem? Is there something we can do about it, or does iOS simply not support this?

Best regards,
Stephan Walter
Embedded Software Engineer

Swissphone Wireless AG
Faelmisstrasse 21
Postfach 81
CH-8833 Samstagern
Tel: +41 44 786 77 52
Fax: +41 44 786 77 71
email@hidden
www.swissphone.com



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 >BLE Write Command while Write Request is pending (From: Walter Stephan <email@hidden>)

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