Multiple times of Write command in BLE after connecting to device

Question

0.00/5 (No votes)

See more:

Hi all, currently i'm working in BLE.
I have connected to the device. Read command and write command works fine.
What My question is...

Can I send the write command again and again after connected to the device.

Posted 24-Mar-15 21:33pm

SViki

Add a Solution

Comments

Richard MacCutchan 25-Mar-15 4:16am

What happens when you try?

SViki 25-Mar-15 5:48am

I have a button to start bluetooth and following the BLE common Role task. It's connected and works fine with follows, now i tried again to send the write command again. But i don't know how to call the
- (void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service{
}

Richard MacCutchan 25-Mar-15 7:56am

Did you check the documentation?

SViki 26-Mar-15 0:47am

In documentation they have not mentioned anything like "you can send the write command again and again after connected to device"

Richard MacCutchan 26-Mar-15 4:12am

Does https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/PerformingCommonCentralRoleTasks/PerformingCommonCentralRoleTasks.html help?

SViki 26-Mar-15 22:18pm

I have checked the docs and created like this...

"
CBCharacteristic *Writechar = nil;
CBPeripheral *writePeri = nil;

-(void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service
error:(NSError *)error
{
for (CBCharacteristic *characteristic in service.characteristics)
{
[peripheral readValueForCharacteristic:characteristic];
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"ABCD"]])
{
Writechar = (CBCharacteristic*)characteristic.UUID;
writePeri = peripheral;
}
}
}

- (void) write
{
...
NSData *data= .... ;
[writePeri writeValue:data forCharacteristic:Writechar type:CBCharacteristicWriteWithResponse];
}
"

While executing this I'm getting the error like this
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CBUUID peripheral]: unrecognized selector sent to instance

and i'm navigating to main.m page
int main(int argc, char * argv[]) {
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}

What is the reason for this and how can i solve this issue.

1 solution

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

SViki · Accepted Answer · 2015-03-26T23:35:00

Ah finally i got the solution. Thanks for everyone who helped me. Here is the solution. Now i can call this write mtd anywhere & any number of times.

CBCharacteristic *Writechar = nil;
CBPeripheral *writePeri = nil;

-(void)peripheral:(CBPeripheral *)peripheral
didDiscoverCharacteristicsForService:(CBService *)service
error:(NSError *)error
{
    for (CBCharacteristic *characteristic in service.characteristics)
    {
            [peripheral readValueForCharacteristic:characteristic];
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
           if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"ABCD"]])
           {
                    Writechar = (CBCharacteristic*)characteristic.UUID;
                    writePeri = (CBPeripheral*)peripheral;
                    [writePeri readValueForCharacteristic:characteristic];
                    [writePeri setNotifyValue:YES forCharacteristic:characteristic];
           }
    }
}



- (void) write
{
for(CBService *service in writePeri.services)
    {
        for (CBCharacteristic *characteristic in service.characteristics) {
            [writePeri readValueForCharacteristic:characteristic];
            [writePeri setNotifyValue:YES forCharacteristic:characteristic];
            if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"ABCD"]]) 
            {
                     [writePeri writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
            }
         }
   }
}

Multiple times of Write command in BLE after connecting to device

1 solution

Solution 1

Add your solution here

Preview 0

Multiple times of Write command in BLE after connecting to device

1 solution

Solution 1

Add your solution here

Preview 0

Existing Members

...or Join us