ESA2GJK1DH1K Basics: STM32 + GPRS (AT command version) source code to achieve MQTT explain (support Air202, SIM800)

 

 

Foreword

　　The program requires a basic knowledge:   https://www.cnblogs.com/yangfengwu/category/1566194.html    all open source code, please learn on their own

　　

 

Open source Section

 

 

 

 

 

I can only say where noted

Now the program does not place a hardware reset of Air202

You do the project when we must add a hardware reset Air202 place

You do the project when we must add a hardware reset Air202 place

You do the project when we must add a hardware reset Air202 place

But GPRS hardware reset each time a waste of time, it can be added

 

PB2 is assumed restart control, low off, high power

 

 

Other did not say anything of the

Another point is, I now set the heartbeat packet is a 3S, if the time required is too long, then

Then the judge will need some time dropped

We do, can look at the data and see what reply GPRS data is dropped,

Which may be the main function

 

 

 

 

 

 

Because of delays GPRS, I set the heartbeat packet response timeout waiting time is 5S