长连接通道 SDK

更新时间：2018-03-23 17:10:49

概述

长连接通道SDK，提供 IoT 业务协议封装的云端数据下行能力；为 app 提供订阅、发布消息的能力, 和支持请求响应模型。

集成方式

如何集成 SDK，查看这里>

初始化

长连接通道 SDK 的初始化依赖 API 通道的初始化，请参见：API 通道 - 初始化
在 API 通道初始化成功后，再参考下面的示例代码初始化长连接通道 SDK:

#import <IMSApiClient/IMSApiClient.h>
#import <AlinkAppExpress/LKAppExpress.h>

IMSConfiguration * imsconfig = [IMSConfiguration sharedInstance];
LKAEConnectConfig * config = [LKAEConnectConfig new];
config.appKey = imsconfig.appKey;
config.authCode = imsconfig.authCode;

[[LKAppExpress sharedInstance]startConnect:config connectListener:self];

使用说明

业务请求响应模型

#import <AlinkAppExpress/LKAppExpress.h>

[[LKAppExpress sharedInstance] invokeWithTopic : @"/account/bind"  opts:nil        params:@{@"iotToken":iotToken}
                                   respHandler:^(LKAppExpResponse * _Nonnull response) {
                                       LKAELogDebug(@"bindAccount result : %@", response);

                                   }];

订阅 Topic

#import <AlinkAppExpress/LKAppExpress.h>

[[LKAppExpress sharedInstance]subscribe:@"/abc/def" complete:^(NSError * _Nullable error) {
    dispatch_async(dispatch_get_main_queue(), ^{
        if (error == nil) {
            [_tipsLabel setText:@"订阅成功"];
        } else {
            [_tipsLabel setText:@"订阅失败"];
        }
    });
}];

取消订阅 Topic

#import <AlinkAppExpress/LKAppExpress.h>

[[LKAppExpress sharedInstance]unsubscrbie:@"/abc/def" complete:^(NSError * _Nullable error) {
    dispatch_async(dispatch_get_main_queue(), ^{
        if (error == nil) {
            [_tipsLabel setText:@"取消订阅成功"];
        } else {
            [_tipsLabel setText:@"取消订阅失败"];
        }
    });
}];

Publish 数据

#import <AlinkAppExpress/LKAppExpress.h>

NSString * text = @"{\"input\":\"Hello World\"}";
NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
if (data == nil) {
    return;
}
NSError *error;
NSDictionary *params = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
if (error) {
    return;
}
[[LKAppExpress sharedInstance]publish:@"/test/publish" params:params
                             complete:^(NSError * _Nonnull error) {
                                 dispatch_async(dispatch_get_main_queue(), ^{
                                     if (error == nil) {
                                         [_tipsLabel setText:@"publish成功"];
                                     } else {
                                         [_tipsLabel setText:@"publish失败"];
                                     }
                                 });
                             }];

注册下行 Listener

#import <AlinkAppExpress/LKAppExpress.h>

@interface TestDownstreamListener : NSObject <LKAppExpDownListener>
@end
@implementation TestDownstreamListener

- (void)onDownstream:(NSString * _Nonnull)topic data:(id  _Nullable)data {

    NSLog(@"onDownstream topic : %@", topic);
    NSLog(@"onDownstream data : %@", data);
    NSDictionary * replyDict = nil;
    if ([data isKindOfClass:[NSString class]]) {
        NSData * replyData = [data dataUsingEncoding:NSUTF8StringEncoding];
        replyDict = [NSJSONSerialization JSONObjectWithData:replyData options:NSJSONReadingMutableLeaves error:nil];

    } else if ([data isKindOfClass:[NSDictionary class]]) {
        replyDict = data;
    }
    if (replyDict == nil) {
        return;
    }
}

- (BOOL)shouldHandle:(NSString * _Nonnull)topic {
    if ([topic isEqualToString:@"/abc/cab"]) {
        return YES;//返回YES，说明对此topic感兴趣,SDK会调用[listener onDownstream:data:]
    }
    return NO;
}
@end

self.testListner = [TestDownstreamListener new];//sdk不会strong持有此listener，开发者自己保证listener不被释放.
[[LKAppExpress sharedInstance]addDownStreamListener:YES listener:self.testListner]