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Re: reading value for non-notifying characteristic

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Re: reading value for non-notifying characteristic

Subject: Re: reading value for non-notifying characteristic
From: András Kövi <email@hidden>
Date: Wed, 13 Feb 2013 12:57:20 +0100

Hi Alessandro,

I'm not sure what sequence do you use to initialize for reading but here is what it should be:

1. discover services

2. discover characteristics in the service discovered callback

3. store the characteristics returned in the callbacks

4. use the stored characteristic as parameter for the readValueForCharacteristic: method.

You cannot create a characteristic. CBMutableCharacteristic is used only on the CBPeripheralManager side for setting up characteristics of services. On the CBCentralManager no mutable characteristic should ever be used. Those objects are created and managed by the CB framework.

Hope this clarifies.

Regards,

Andras

2013/2/13 Alessandro Gregori <email@hidden>

Hi,
you can tell a CBPeripheral to send notification for a characteristic by calling

- (void)setNotifyValue:(BOOL)notifyValue forCharacteristic:(CBCharacteristic *)characteristic;

When data becomes available, the relevant callback is called and you can use the characteristic value.
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error

But what about non-notifying characteristic?

If I set in a peripheral a CBMutableCharacteristic's properties to CBCharacteristicPropertyRead I expect that if I call readValueForCharacteristic: the callback will be called.
Instead I get this error:
Error Domain=CBErrorDomain Code=0 "The operation couldn’t be completed. (CBErrorDomain error 0.)"

Am I doing something wrong?

Alessandro

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References:
	>reading value for non-notifying characteristic (From: Alessandro Gregori <email@hidden>)

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