要做物联网,首先我们要把硬件连接到WiFi,如何连接有很多种方案,比如在硬件上安装一个热点,手机连接这个热点把WiFi名字和密码传给硬件,也可以通过声波等等......仅说一下在最近项目中用到的:WiFi快连技术.SmartConfig其实是最早攻克这项技术的厂商TI的一种叫法.
原理大致是:
手机APP端发送包含WiFi用户名WiFi密码的UDP广播包或者组播包,智能终端的WiFi芯片可以接收到该UDP包,只要知道UDP的组织形式,就可以通过接收到的UDP包解密出WiFi用户名密码,然后智能硬件配置收到的WiFi用户名密码到指定的WiFiAP上。
首先你要有一个可以支持SmartConfig技术的硬件(可以直接在TI购买http://www.ti.com.cn/tool/cn/smartconfig);
大致是这样:
Ti本身就有app,功能简单,就是把WiFi名字和密码传给硬件,让硬件连上WiFi;
我们要做一个连接界面放到我们的app中,我找了好几天找到了这个比较好的源码(https://github.com/ray-x/Wifi-TI3200)
他的效果是这样子的:
我最终做出来是这个样子的:
打开上面的工程后看一下文件
红色箭头是必须导入的库,蓝色箭头是主要模块控制器的代码,下面的是核心静态库
但是这个源码有个问题,点击了"Start"之后,控制台会疯狂打印app发送的UDP数据包大小Packet size
我目前也不知道如何取消打印,定义NSLog宏和printf宏都不好使,我觉得应该是静态库中的问题.虽然不影响使用,但若有人知道如何处理恭请评论赐教哇
控制器.h中什么都没有,下面是我的部分.m中代码:
#import "JDWifiVC.h"
#import "JDWifiView.h"
#import <SystemConfiguration/CaptiveNetwork.h>//显示WiFi名称
#import "MBProgressHUD.h"
//#import "Reachability.h"//可连接性检查模块,监测iOS设备网络环境
#import "SmartConfigGlobalConfig.h"
#import "SmartConfigDiscoverMDNS.h"
#import "FirstTimeConfig.h"
@interface JDWifiVC ()
@property (nonatomic,weak)JDWifiView *wifiView;
@property (nonatomic, assign) BOOL canceled;//取消弹窗
//@property (nonatomic, strong) Reachability *wifiReachability;
@property (atomic,strong) SmartConfigGlobalConfig *globalConfig;
@property (nonatomic) SmartConfigDiscoverMDNS *mdnsService;
@property (nonatomic) FirstTimeConfig *firstTimeConfig;
@property (atomic, copy) NSString *passwordKey;
@property (nonatomic,weak) NSTimer *mdnsTimer;
@property (nonatomic,assign) BOOL discoveryInProgress;
@end
int const MDNSRestartTime = 15;
@implementation JDWifiVC
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
//设置UI
[self setupUI];
//监测wifi状态,我觉得没必要用Reachability,连不上用户自己就去检查路由器了嘛
// [self detectWifi];
self.discoveryInProgress = NO;
// Do any additional setup after loading the view, typically from a nib.
//都是库中的方法,直接调用
self.globalConfig = [SmartConfigGlobalConfig getInstance];
// init mdns service
self.mdnsService = [SmartConfigDiscoverMDNS getInstance];
// add notification for discovered device
//自动发现设备
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(deviceAdded:)
name:@"deviceFound"
object:nil];
}
-(void)dealloc
{
//停止发送udp
[self stopDiscovery];
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
//跳转设置界面
-(void)pushSetting
{
//需要在plist文件中加prefs
NSURL *url = [NSURL URLWithString:@"prefs:root=WIFI"];
if ([UIDevice currentDevice].systemVersion.floatValue <= 10.0)
{
[[UIApplication sharedApplication] openURL:url];
}else{
// iOS10 之后,只能跳转到应用设置界面,UIApplicationOpenSettingsURLString这个只支持iOS8之后.
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
}
}
//显示当前连接WiFi名称
-(void)getCurrentWifiName
{
//WiFi名字
NSString *ssid = @"Not Found";
//mac地址
NSString *macIp = @"Not Found";
CFArrayRef myArray = CNCopySupportedInterfaces();
if (myArray != nil)
{
CFDictionaryRef myDict = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));
if (myDict != nil)
{
NSDictionary *dict = (NSDictionary*)CFBridgingRelease(myDict);
ssid = [dict valueForKey:@"SSID"];
macIp = [dict valueForKey:@"BSSID"];
}
}
[self.wifiView.wifiNameBtn setTitle:ssid forState:UIControlStateNormal];
}
//点击开始连接按钮
-(void)didClickNextBtn
{
//先检查一下
NSString *wifiName = self.wifiView.wifiNameBtn.titleLabel.text;
NSString *wifiPassword = self.wifiView.wifiPasswordTF.text;
if (
([wifiName isEqualToString:@"wifi名字"])||
(!wifiPassword)||
wifiPassword.length == 0
)
{
[self alertWithMessage:@"请检查WiFi和密码是否正确"];
}
//开始连接
else
{
//我用的MBHUD,给一个圆环状进度条,还可以取消连接
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
// Set the determinate mode to show task progress.
hud.mode = MBProgressHUDModeDeterminate;
hud.label.text = NSLocalizedString(@"连接中...", @"HUD loading title");
// Configure the button.
[hud.button setTitle:NSLocalizedString(@"取消", @"HUD cancel button title") forState:UIControlStateNormal];
[hud.button addTarget:self action:@selector(cancelWork) forControlEvents:UIControlEventTouchUpInside];
dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0), ^{
// 更新进度
[self doSomeWorkWithProgress];
dispatch_async(dispatch_get_main_queue(), ^{
[hud hideAnimated:YES];
[self stopDiscovery];
});
});
}
}
//圆环进度条
- (void)doSomeWorkWithProgress
{
//开始
[self continueStartAction];
self.canceled = NO;
// This just increases the progress indicator in a loop.
float progress = 0.0f;
while (progress < 1.0f) {
if (self.canceled) break;
progress += 0.01f;
dispatch_async(dispatch_get_main_queue(), ^{
// Instead we could have also passed a reference to the HUD
// to the HUD to myProgressTask as a method parameter.
[MBProgressHUD HUDForView:self.navigationController.view].progress = progress;
});
//发送udp包秒数30秒
usleep(300000);
}
}
//取消连接
- (void)cancelWork
{
[self stopDiscovery];
self.canceled = YES;
}
//停止发送udp
-(void) stopDiscovery {
[self.mdnsTimer invalidate];
self.mdnsTimer = nil;
self.discoveryInProgress = NO;
[self.firstTimeConfig stopTransmitting];
[self mDnsDiscoverStop];
}
- (void) continueStartAction
{
self.discoveryInProgress = YES;
[self startTransmitting];
}
/*
This method start the transmitting the data to connected
AP. Nerwork validation is also done here. All exceptions from
library is handled.
这个方法开始传输数据连接Ap。网上验证也是在这里完成。所有的异常库处理。
*/
- (void)startTransmitting{
//假如...就...最后..语句
@try {
[self connectLibrary];
if (self.firstTimeConfig == nil)
{
return;
}
[self sendAction];
}
//出错的处理
@catch (NSException *exception) {
//NSLog(@"%s exception == %@",__FUNCTION__,[exception description]);
[self performSelectorOnMainThread:@selector(alertWithMessage:) withObject:[exception description] waitUntilDone:NO];
}
@finally {
}
}
// check for internet and initiate the libary object for further transmit.
//检查网络和启动库进一步传播。
-(void) connectLibrary
{
NSString *wifiName = self.wifiView.wifiNameBtn.titleLabel.text;
NSString *wifiPassword = self.wifiView.wifiPasswordTF.text;
@try {
//断开库
[self disconnectFromLibrary];
self.passwordKey = [self.wifiView.wifiPasswordTF.text length] ? self.wifiView.wifiPasswordTF.text : nil;
NSString *ipAddress = [FirstTimeConfig getGatewayAddress];
self.firstTimeConfig = [[FirstTimeConfig alloc] initWithData:ipAddress withSSID:wifiName withKey:self.passwordKey withFreeData:nil withEncryptionKey:nil numberOfSetups:4 numberOfSyncs:10 syncLength1:3 syncLength2:23 delayInMicroSeconds:1000];
[self mDnsDiscoverStart];
// set timer to fire mDNS after 15 seconds
self.mdnsTimer = [NSTimer scheduledTimerWithTimeInterval:MDNSRestartTime target:self selector:@selector(mDnsDiscoverStart) userInfo:nil repeats:NO];
}
@catch (NSException *exception) {
//NSLog(@"%s exception == %@",__FUNCTION__,[exception description]);
[self performSelectorOnMainThread:@selector(alertWithMessage:) withObject:[exception description] waitUntilDone:NO];
}
}
/**
MDNS Discovery
*/
- (void) mDnsDiscoverStart
{
[self.mdnsService startMDNSDiscovery:nil];
}
- (void) mDnsDiscoverStop
{
[self.mdnsService stopMDNSDiscovery];
}
/*
This method begins configuration transmit
In case of a failure the method throws an OSFailureException.
这个方法开始配置传输对于失败的方法抛出一个OSFailureException
*/
-(void) sendAction{
@try {
//NSLog(@"%s begin", __PRETTY_FUNCTION__);
[self.firstTimeConfig transmitSettings];
//NSLog(@"%s end", __PRETTY_FUNCTION__);
}
@catch (NSException *exception) {
//NSLog(@"exception === %@",[exception description]);
[self performSelectorOnMainThread:@selector(alertWithMessage:) withObject:[exception description] waitUntilDone:NO];
}
@finally {
}
}
//弹窗警告
-(void)alertWithMessage:(NSString *)message
{
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"哎呀,出错啦" message:message preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"再试一次" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alert addAction:action1];
[self presentViewController:alert animated:YES completion:nil];
}
// disconnect libary method involves to release the existing object and assign nil.
//断开库方法需要释放现有对象和分配nil。
-(void) disconnectFromLibrary
{
self.firstTimeConfig = nil;
}
-(void)deviceAdded:(id)sender
{
if(self.discoveryInProgress == YES)
{
[self stopDiscovery];
[self alertWithMessage:@"新设备被发现"];
}
}
这个技术有一个问题,就是连接比较慢.我对iPhone做过一定的测试:
iPhone5S以发送udp包1分钟为一次,10次连接成功在4次左右,官方app稍高一点,7次左右,但并不是百分之百;
以发送udp包2分钟为一次,10次连接成功5次左右,是可以稍微提高的;
iPhone6与iPhone5S情况差不多
iPhone6S则不论在哪种情况下10次连接成功都在1次左右,官方app就没连接成功过(醉了...😂)
iPhone7在哪种情况下都没成功过
打电话给售后给我个邮箱,发送了邮件也不知道猴年马月能回复...不过搜索了一下6S普遍有这个问题,不知如何解决
最后在技术论坛上找到了答案:应该是硬件兼容性问题.
解决办法的话,TI适配6S以上的硬件明年才会量产,所以换个厂家的硬件吧😂比如 鼎甲微联http://www.djlink.cn/
希望能帮助到刚做这方面的同僚,节约一点时间;
若有知道如何解决上述问题的,评论留言不胜感激;
若有不妥之处也希望能够在评论指正,大家一起进步
网友评论
NB-LTE和NB-IoT有了解一点，但没做过
WiFi快连技术适合短时间与硬件通信的，
NB-LTE和NB-IoT一般是长连接