[英]iOS 13 Core Bluetooth saved peripheral services showing nil after already being discovered
[英]iOS Core Bluetooth: Advertised service is not discovered on peripheral
在連接到廣告我感興趣的特定服務的BLE設備之后,為了發現這項服務,我打電話給:
[self.peripheral discoverServices:@[[self.class serviceUUID]]];
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
委托方法被調用而沒有錯誤,但是為外設返回的服務數是0,因此沒有進一步發現特征。 有誰知道為什么會這樣? 提前致謝!
以下是委托方法的完整主體。
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
if (error) {
NSLog(@"didDiscoverServices failed: %@", error);
return;
}
NSLog(@"didDiscoverServices succeeded for peripheral: %@.", peripheral.name);
NSLog(@"Number of services: %d", peripheral.services.count);
for (CBService *s in peripheral.services) {
NSLog (@"Discovered service UUID: %@", s.UUID);
if ([s.UUID isEqual:[self.class serviceUUID]]) {
NSLog(@"Discover characteristics...");
[self.peripheral discoverCharacteristics:@[[self.class controlPointCharacteristicUUID], [self.class packetCharacteristicUUID]] forService:s];
}
}
}
控制台顯示:
2014-11-27 15:54:51.933 k[197:13362] didDiscoverServices succeeded for peripheral: BootK
2014-11-27 15:54:51.934 k[197:13362] Number of services: 0
我唯一能想到的是[self.class serviceUUID]
與您正在尋找的服務的UUID不匹配。 當您啟動掃描時,是否按服務UUID進行過濾?
[self.centralManager scanForPeripheralsWithServices:[self.class serviceUUID] options:nil];
如果沒有,這可以解釋為什么您能夠發現並連接到它,但不能發現該特定服務。
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