App uses the template message from WeChat official account for message push.

Development background

        To save money , Keep alive 、 On the tall .

Environmental preparation

• Application for official account ;
• Open wechat authentication （300 element / year ）;
• Apply for wechat open platform ;
• Buy a domain name and file it （100 yuan /3 year ）;
• Buy a server and resolve the domain name to the server （299 element /3 year ）;

Realization principle

1. User download app And log in using wechat , Get wechat openid;
2. take openid、 cell-phone number 、 equipment IMEI、 And user information post Save in the background ;
3. When message push is triggered （ Such as equipment alarm ）, according to openid Push relevant information to specified users ;

Pit in practice

One 、 Application for official account

        At first, I didn't pay attention to , The official account is directly applied to subscribe. , When I went in, I found that I couldn't find the template message , Second, there is no way to conduct wechat authentication ;
        solve ： Apply for a new service number ;

Two 、 Open wechat authentication

        Select industrial and commercial business when uploading the business license **（ A little forgotten ）, Choose the combination of three certificates at the beginning , The audit failed ; The second is that you will receive a call from Tencent to the public account 0.01 element , Then when I receive a call from the staff, I will ask how much the money is , What time , You need to see it in advance ;
        Because of the above two questions, I have been wrong twice , The staff will prompt that if you make another mistake, you will need to resubmit the application , It means to hand it in again 300 $certification fee , Recertification ;

3、 ... and 、 Apply for wechat developer account

        When entering the wechat open platform for account application , Change which mailbox will prompt that it has been used , But when it is used to retrieve the password, it indicates that it has not been registered .
        Finally, I learned from various communities , This mailbox must not be bound to any Tencent product .
        solve ： It is suggested to untie and re apply , My solution is that I don't need it directly , Switch to web authorization mode for acquisition openid;

Four 、 obtain openid（ Code gate ）

        Unable to apply for wechat open platform account , Therefore, it can only be obtained by using the web page authorization mode openid, I've fallen into a big pit here , A big push file , I don't know where it is , You can only try it step by step ;
        The first is acquisition code I need a appid and redirect_uri token url , This appid It's easy to see （ Development 》 Basic configuration 》 Official account development information ） You can set . But this callback address makes me angry , There is also a server configuration below , I always thought this was where the callback address was configured , It's been all morning token Authentication failed （ It is mainly to find relevant instructions on the official website ）;

        When I couldn't find a solution on the official website, I began to ask Du Niang , Fortunately, omnipotent netizens shared the solution , this TM It's not configured here at all , See the figure below for details .

        From here to put the business domain name 、JS Interface security domain name 、 The authorized domain names of web pages are configured , This is the question of understanding ;

6、 ... and 、 Message template push

        If you want to get ahead openid There are too many and scattered interface description documents , The template message push interface is much simpler , It was so simple that I had to go through all the documents again to find this ACCESS_TOKEN North Africa ACCESS_TOKEN;
        Obtained directly with web authorization ACCESS_TOKEN The template message push request will be reported 40001 Error of ;

        So specific ACCESS_TOKEN And which one ？ Look here I think I saw it in my bag , The ignorant force in front has great stamina , I haven't woken up yet ;

7、 ... and 、 For people who can't drink, ignorance also has stamina

        I thought everything was ready here , I didn't expect to find this force in the code, since it is still there . So where exactly ？ The reason is that we didn't add IP White list , Once you master this thing, you can't have infinite stamina , Let's take a look at the specific settings .

At the end

        Failure is not a success. His mother. , At best, it's his ex girlfriend , Finally, let's settle an account , The official account message is not worthwhile pushing him. .

        From the book point of view, it is more cost-effective , After all, third-party push is not very cheap now , Hope it can be helpful to you who have relevant needs , I quit .