CODEWITHSUNDEEP
iosbluetoothcore-bluetooth
falt86
falt86

Reputation: 133

iOS CoreBluetooth unlikely error

I am working on an Appcelerator module that utilizes Core Bluetooth. I can connect to a peripheral without issue, and subscribe to a characteristic. I have implimented all delegate functions and everything appears to be firing as expected, except that I get an 'unlikely error' when attempting to read or write. My central methods are shown below.

-(void)readValueForCharacteristicByUUID:(NSString *)uuidstring
{
if (self.connectedService)
{
    CBMutableCharacteristic* characteristic = [self characteristicFromUUIDstring:uuidstring];
    if (characteristic)
    {
        [self.connectedPeripheral readValueForCharacteristic:characteristic];
    }
} else {
    NSLog(@"[INFO] No service to read");
}
}

-(void)writeValue:(NSData*)value ForCharacteristicByUUID:(NSString*)uuidstring
{
if (self.connectedService)
{
    CBMutableCharacteristic* characteristic = [self characteristicFromUUIDstring:uuidstring];
    if (characteristic)
    {
        [self.connectedPeripheral writeValue:value forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }
} else {
    NSLog(@"[INFO] No service to write to");
}
}

-(CBMutableCharacteristic*)characteristicFromUUIDstring:(NSString*)uuidstring
{
for (CBMutableCharacteristic* c in self.connectedService.characteristics)
{
    if ([c.UUID.UUIDString isEqualToString:uuidstring])
    {
        return c;
    }
}
NSLog(@"No Characteristic found with that uuid");
}

I am thinking it may be a permissions issue, so here is the code I use to create the characteristics in my peripheral.

CBMutableCharacteristic* c = [[CBMutableCharacteristic alloc] initWithType:cuuid
                                                                properties:CBCharacteristicPropertyRead|CBCharacteristicPropertyWrite|
                                                                    CBCharacteristicPropertyNotify
                                                                     value:nil
                                                               permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];

Upvotes: 1

Views: 1536

Answers (1)

Paulw11
Paulw11

Reputation: 115051

From the CBMutableCharacteristic class reference

CBMutableCharacteristic objects represent the characteristics of a local peripheral’s service (local peripheral devices are represented by CBPeripheralManager objects).

You can't use a CBMutableCharacteristic instance with a CBCentralManager to communicate with a remote peripheral.

You have to use the CBCharacteristic that is returned to the peripheral's peripheral:didDiscoverCharacteristicsForService:error: delegate method after calling discoverCharacteristics:forService: on the connected CBPeripheral.

Upvotes: 2

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