CODEWITHSUNDEEP
iosobjective-cbluetoothbluetooth-lowenergy
Vikram Thakor
Vikram Thakor

Reputation: 107

iOS- BLE <CBCharacteristic: does not specify the "Write Without Response" property - ignoring response-less write

When I load any method at that time it shows me this warning where as I am using that characteristic which is retrieving from method

var cbChar :  CBCharacteristic
 func bleManagerPeripheral(_ peripheral: CBPeripheral!, didUpdateValueFor characteristic: CBCharacteristic!, error: Error!) {
   cbChar = characteristic
}

I get warning when I try to write following line

[self.cb  writeValue:aData forCharacteristic:cbChar type:1];

I am getting following warmning

[CoreBluetooth] WARNING: Characteristic , notifying = NO> does not specify the "Write Without Response" property - ignoring response-less write

Can any one help me?

Upvotes: 1

Views: 1591

Answers (1)

Paulw11
Paulw11

Reputation: 114773

The characteristic you are writing to does not support write without response, but when you call writeData you are passing 1 for the type parameter. 1 corresponds to CBCharacteristicWriteWithoutResponse. The warning is telling you that Core Bluetooth can't do what you have asked.

You need to specify CBCharacteristicWriteWithResponse

[self.cb  writeValue:aData forCharacteristic:cbChar type: CBCharacteristicWriteWithResponse];

Upvotes: 3

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