[英]Not able to send data to BLE Peripheral (ZL-RC04A) device
我正在尝试使用代码片段编写数据。
- (void)peripheral:(CBPeripheral *)peripheral1 didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
// Again, we loop through the array, just in case.
for (CBCharacteristic *characteristic in service.characteristics) {
// And check if it's the right one
if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
NSString *payloadMessage = @"3N";
NSData *payload = [payloadMessage dataUsingEncoding:NSUTF8StringEncoding];
[_discoveredPeripheral discoverDescriptorsForCharacteristic:characteristic];
[_discoveredPeripheral writeValue:payload forCharacteristic:characteristic
type:CBCharacteristicWriteWithResponse];
[_discoveredPeripheral setNotifyValue:YES forCharacteristic:characteristic];
}
}
}
但是出现错误
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
{
}
为: Error Domain=CBATTErrorDomain Code=3 "Writing is not permitted." UserInfo={NSLocalizedDescription=Writing is not permitted.}
Error Domain=CBATTErrorDomain Code=3 "Writing is not permitted." UserInfo={NSLocalizedDescription=Writing is not permitted.}
虽然相同的工作在Android。
如果为特性使用了错误的写入类型,则会出现该错误(毕竟特性是可写的)。 有两种类型的数据写入特征:
CBCharacteristicWriteWithResponse
:在这种情况下,您将获得外围设备的确认数据包。 您可以将其视为TCP数据包。
CBCharacteristicWriteWithoutResponse
:这是一种“ CBCharacteristicWriteWithoutResponse
”的写法。 您可以将其视为UDP数据包。
因此,尝试使用CBCharacteristicWriteWithoutResponse
而不是CBCharacteristicWriteWithResponse
。 如果效果不佳,则可能必须检查您的特征是否可写。
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