[2017.6 Digital Twin] Server

Server

These days I concentrate on the program of the server. I hava done the job on the Arduino. Now I need transmitt it to a server.

First I design a Packet program. It can pack the different kinds of data together. eg. When the data are like these:

temperature = 25.3

switch = true

then the packet is like this:

2

temperature

switch

double

bool

25.3

true

which means, 

>there are two variables.

>the names of variables are"temperature" and "switch"

>the types of variables are "double" and "bool"

>the values of variables are 25.3 and true

the packet will transmit through the serial to the raspberry pi. The Pi need to unpack the pack. And Raspberry pi can add some other information in the packet. like this:

3

temperature

switch

raspberry

double

bool

string

25.3

true  

Hallo, I am Pi

and the raspberry pi transmit the data further to server. 

about the server and client. I use socket program. This part wastes me a lot of time.

Because it need to write 3 Thread at each parts. They are

> Client/Server
 
> ReadHandlerThread

> WriteHandlerThread

The Client/Server Thread is used to build connect between Client and Server. When the connection is built. The next two Threads start. They are used to receive or send data through socket.

Finially. I finish all the program. And at server, it can send the data back to Arduino. like this