crash with publishProperties

hello, i find a crash when send message; the ips info is blow: example 1: ` SIGSEGV: 0xffffff818ac549e0 0x0 + 6619471872

| $s11CommonKit_a21MqttPublishPropertiesC15correlationDataSays5UInt8VGSgvgTm 0 | 0 0x0000000105c317c4 -[CKCrashReporter recordCrashWithSignal:] 1 | 1 0x0000000105c347c8 SignalHandler 2 | 2 libsystem_platform.dylib 0x00000001d29d429c _sigtramp 3 | 3 libswiftCore.dylib 0xffffff818ac549e0 0x0 + 6619471872 4 | 4 libswiftCore.dylib 0x000000018ac549e0 swift_retain 5 | 5 libswiftCore.dylib 0x000000018ac90d60 swift_bridgeObjectRetain 6 | 6 0x0000000104ebf28c $s11_a21MqttPublishPropertiesC15correlationDataSays5UInt8VGSgvgTm 7 | 7 0x0000000104ebfc80 $s11_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg 8 | 8 0x0000000104ec1454 $s11_a12FramePublishV15variableHeader5Says5UInt8VGyF 9 | 9 0x0000000104ec138c $s11_a12FramePublishVAA0C0A2aDP15variableHeader5Says5UInt8VGyFTW 10 | 10 0x0000000104ebae40 $s11_a5FramePAAE5bytes7versionSays5UInt8VGSS_tF 11 | 11 0x0000000104eb7470 $s11CoKit_a10CocoaMQTT5C7deliver_10wantToSendyAA0C11MQTTDeliverC_AA5Frame_ptFTf4dnn_n 12 | 12 0x0000000104ed7254 $s11CoKit_a16CocoaMQTTDeliverC7sendfun33_3A1FA28A55E8D3E9C161EBC734F6C95BLLyyAA5Frame_pFyyYbcfU_TATm

example 2: ` SIGSEGV: 0x0000000101287e18 $s11CommonKit_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg

| $s11CoKit_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg 0 | 0 0x0000000101ff97c4 -[CKCrashReporter recordCrashWithSignal:] 1 | 1 0x0000000101ffc7c8 SignalHandler 2 | 2 libsystem_platform.dylib 0x00000001f7de6290 _sigtramp 3 | 3 0x0000000101287e18 $s11CoKit_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg 4 | 4 0x0000000101287e18 $s11CoKit_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg 5 | 5 0x0000000101289454 $s11CoKit_a12FramePublishV15variableHeader5Says5UInt8VGyF 6 | 6 0x000000010128938c $s11CoKit_a12FramePublishVAA0C0A2aDP15variableHeader5Says5UInt8VGyFTW 7 | 7 0x0000000101282e40 $s11CoKit_a5FramePAAE5bytes7versionSays5UInt8VGSS_tF 8 | 8 0x000000010127f470 $s11CoKit_a10CocoaMQTT5C7deliver_10wantToSendyAA0C11MQTTDeliverC_AA5Frame_ptFTf4dnn_n 9 | 9 0x000000010129f254 $s11CoKit_a16CocoaMQTTDeliverC7sendfun33_3A1FA28A55E8D3E9C161EBC734F6C95BLLyyAA5Frame_pFyyYbcfU_TATm

the code of mqtt is blow:

(instancetype)init { self = [super init]; if (self) { self.pubProp = [[MqttPublishProperties alloc] initWithContentType:@"JSON"]; } return self; }
(void)sendMessageData:(id)data ToTopic:(NSString )topic userProperty:(nullable NSDictionary )userInfo{ dispatch_async(self.customQueue, ^{ NSError error = nil; NSString dataStr = nil; // 将 NSDictionary,NSArray 再转为JSON 数据 if([data isKindOfClass:[NSDictionary class]]||[data isKindOfClass:[NSArray class]]) { NSData jsonData = [NSJSONSerialization dataWithJSONObject:data options:NSJSONWritingPrettyPrinted error:&error]; if (jsonData) { // 将 JSON 数据转换为字符串 dataStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]; } } else if([data isKindOfClass:[NSString class]]) { dataStr = (NSString )data; }
```
[self.pubProp setUserProperty:userProps];

if (dataStr && topic ) {

    NSInteger ret = [self.mqtt5 publish:topic withString:dataStr qos:CocoaMQTTQoSQos0 DUP:NO retained:NO properties:self.pubProp];
    if (ret == -1) {
         [MQTTClientManager reportMqttLogs:@{@"messageTopic": topic } withId:@"messageBlock" withTime:nil type:nil];
    }
}
```
}); } `

how can this happen the "pubProps" is not release

it seems crash in blow code

` func properties() -> [UInt8] {

    // Properties
    return publishProperties?.properties ?? []
}

public var properties: [UInt8] {
    var properties = [UInt8]()

    //3.3.2.3.2  Payload Format Indicator
    if let payloadFormatIndicator = self.payloadFormatIndicator {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.payloadFormatIndicator.rawValue, value: [payloadFormatIndicator.rawValue])
    }
    //3.3.2.3.3  Message Expiry Interval
    if let messageExpiryInterval = self.messageExpiryInterval {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.willExpiryInterval.rawValue, value: messageExpiryInterval.byteArrayLittleEndian)
    }
    //3.3.2.3.4 Topic Alias
    if let topicAlias = self.topicAlias {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.topicAlias.rawValue, value: topicAlias.hlBytes)
    }
    //3.3.2.3.5 Response Topic
    if let responseTopic = self.responseTopic {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.responseTopic.rawValue, value: responseTopic.bytesWithLength)
    }
    //3.3.2.3.6 Correlation Data
    if let correlationData = self.correlationData {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.correlationData.rawValue, value: correlationData)
    }
    //3.3.2.3.7 Property Length User Property
    if let userProperty = self.userProperty {
        for (key, value) in userProperty {
            properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.userProperty.rawValue, value: key.bytesWithLength + value.bytesWithLength)
        }
    }
    //3.3.2.3.8 Subscription Identifier
    if let subscriptionIdentifier = self.subscriptionIdentifier,
       let subscriptionIdentifier = beVariableByteInteger(subscriptionIdentifier) {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.subscriptionIdentifier.rawValue, value: subscriptionIdentifier)
    }
    //3.3.2.3.9 Content Type
    if let contentType = self.contentType {
        properties += getMQTTPropertyData(type: CocoaMQTTPropertyName.contentType.rawValue, value: contentType.bytesWithLength)
    }

    return properties
}

emqx / CocoaMQTT

crash with publishProperties #600

hello, i find a crash when send message; the ips info is blow: example 1: ` SIGSEGV: 0xffffff818ac549e0 0x0 + 6619471872

example 2: ` SIGSEGV: 0x0000000101287e18 $s11CommonKit_a21MqttPublishPropertiesC10propertiesSays5UInt8VGvg