Peripheral.m

- (void)peripheralManager:(CBPeripheralManager *)peripheral
  didReceiveWriteRequests:(NSArray <CBATTRequest *>*)requests {
    for (CBATTRequest *request in requests) {
        if (request.value) {
            NSString *value = [[NSString alloc] initWithData:request.value encoding:NSUTF8StringEncoding];

            if ([_delegate respondsToSelector:@selector(BLEPeripheralComponentReceiveMessage:message:)]) {
                __weak typeof(self) weakSelf = self;
                dispatch_async(dispatch_get_main_queue(), ^{
                    [weakSelf.delegate BLEPeripheralComponentReceiveMessage:self message:value];
                });
            }

            [peripheral respondToRequest:request withResult:CBATTErrorSuccess];
        }
    }
}