"STM32. Net MF Development Board Learning-27" GPRS communication implementation

GPRS is the general Packet Radio Service (Universal Packet Wireless Services technology) abbreviation, it is GSM mobile phone users can be a mobile data service. GPRS and the previous continuous channel transmission in different ways, is a packet (Packet)-type transmission. We have developed the YFSoft.Hardware.GPRS library based on the. NET Micro Framework 4.1 platform, through which the user simply invokes the relevant interface and can realize GPRS communication.

Our choice of hardware is based on the sim300_v7.02 module of the Development Board, through the serial port and the. NET MF Development Board to connect (the following figure).

Because the. NET MICRO Framework Development Board provides the serial port as the parent header, so and the GPRS Development Board connection needs to make a special connection line, simple period, I used a single row of needles to do the three-line cross connector (but preferably with a special connector, the following connector is not very close, Prone to communication failures), as shown below.

After the hardware platform is built, we write GPRS TCP Communication program (UDP and TCP are similar, here is no longer an example).

The core code is as follows:

public static void Main ()

{

GPRS = new GPRS ("COM2", 115200, GPRS). GPRSTYPE.SIM300_V7_02);

Gprs. DataReceived + = new Gprsdatareceivedeventhandler (gprs_datareceived);

if (Ret=gprs. Open ())!= 0)

{

Debug.Print ("Open Failed:" + ret.) ToString ());

Gprs. Close ();

Return

}

if (ret = GPRS. SETAPN ("CMNET"))!= 0)

{

Debug.Print ("Config Failed:" + ret.) ToString ());

Gprs. Close ();

Return

}

Debug.Print ("Signal:" + GPRS.) Signal.tostring ());

if (!gprs. Connect (GPRS. Gprsmode.tcp, "221.217.???.???", 8080, 200)

{

Debug.Print ("Connect failed!");

Gprs. Close ();

Return

}

Debug.Print ("IP:" + GPRS.) Localip);

Debug.Print (GPRS. Statestring (GPRS. State));

while (true)

{

Thread.Sleep (1000);

}

Gprs. Disconnect ();

Gprs. Close ();

}

static void Gprs_datareceived (object sender)

{

GPRS GPRS = (GPRS) sender;

if (GPRS). Available > 0)

{

Debug.Print (GPRS. Receive ());

}

}

static void Key_click (Button button, keypad.buttonstate State, DateTime)

{

string keyname = "";

if (state = = KeyPad.ButtonState.Up && GPRS!= NULL)

{

if (!gprs. Send ("Hello MF-" + keyname, 1000))

{

Debug.Print ("Send failed!");

}

}

}

Before starting the test, we need to run a TCP server program (which can be downloaded from the connection provided at the end of the article), as shown in the following figure:

The results of the. NET Micro Framework code running in VS2010 are as follows:

We send data to the server according to the buttons on the Development Board, or send data to the Development Board through the TCPServer program, and the effect is as shown in the two figure.

In order to facilitate users ' in-depth understanding of YFSoft.Hardware.GPRS library, we have written a detailed library function manual, the main contents are as follows: 1 "Properties" 1.1 overtime

Properties: reading and writing

Description: timeout, which refers to the response time of the device when sending an at command, which is used in conjunction with an at instruction that returns OK or error in response. The time unit is milliseconds, and the timeout wait time is likely to be greater than the value when actually used. 1.2 Signal

properties: read only

Description: current cell phone signal strength.

Range:

0-113 DBm or less

1-111 dBm

2...30-109 ... -53 dBm

31-51 DBm or greater

Not known or not detectable 1.3 State

properties: read only

Description: GPRS status.

0-none,

1-ip_initial,

2-ip_start,

3-ip_config,

4-ip_ind,

5-ip_gprsact,

6-ip_status,

7-tcp_connecting,

8-udp_connecting,

9-ip_close,

10-CONNECT_OK, 1.4 localip

properties: read only

Description: local IP address. 1.5 Connected

properties: read only

Description: TCP connection status. 1.6 Available

properties: read only

Description: The length of the data received by the current receive buffer. 2 "Events" 2.1 datareceived

statement: Gprsdatareceivedeventhandler datareceived

parameters:Instance of Object Sender–gprs class

Description: TCP or UDP has received data 2.2 messagereceived

statement: Smsmessagereceivedeventhandler messagereceived

parameters:Instance of Object Sender–gprs class

Note: SMS receive notification 3 "method" 3.1 GPRS

statement: GPRS (string portname, int baudrate,gprstype type)

parameters:portname– serial name, such as COM1

baudrate– baud rate, default 115200

TYPE–GPRS module type, currently supports SIM300_V7_02 and its compatible modules.

back: none

Description: The constructor of the GPRS class. 3.2 Setdebugmode

Disclaimer:void Setdebugmode (bool on)

parameters:on–true turn on debug mode False turns debug mode off

back: none

Note: set debug mode, the content of the at instruction in the communication process will be output through the Debug.Print function. 3.3 Open

declaration:int Open ()

Parameters: None

return: operation return value

0– success

The serial port failed to open

2– device is not online (at)

3– set echo failure (ATE1)

4– Set IP header display failed (at+ciphead=1)

5– settings Return Information format failed (ATV1)

6– failed to set message format (at+cmgf=1)

7– setting output error message mode failure (at+cmee=0)

8– Detect sim Failure (At+cpin?)

9– registration to the mobile operator's network failed (At+creg? )

Description: Open the serial port and make the necessary configuration. 3.4 Close

declaration:Void Close ()

Parameters: None

back: none

Description: close the serial port. 3.5 SETAPN

declaration:int SETAPN (string apn)

parameters:The name of the apn– access point, such as Cmnet

return: operation return value

0– success

Registered GPRS service failed

2– Configuration access Point failed

3– Set Connection mode failed, connection is server or domain 0 is IP address

4– Set Application Mode failed, if 1 the AT command sent is also the data requires a service-side lift, if 0 at instruction will be responsive

Description: Configure GPRS necessary parameters. 3.6 statestring

statement:string statestring (gprsstate state)

parameters:State–gprs State

return: A string form of GPRS status

"IP INITIAL",

"IP START",

"IP CONFIG",

"IP IND",

"IP Gprsact",

"IP STATUS",

"TCP connecting",

"UDP connecting",

"IP Close",

"CONNECT OK"

Note: returns the form of a string of GPRS status. The. NET Micro framework differs from the. NET Framework, and ToString does not return the name of the enum, but the character of the corresponding number. 3.7 Connect

Disclaimer:bool Connect (gprsmode mode,string ip,int port,int Overtime)

parameters:mode–tcp or UDP

ip– Server IP Address

port– Port

overtime– and overtime are different, which is the timeout time to wait for a connection to succeed.

return: connection state BOOL succeeded false failed

Note that the communication status is also successful when the current state is ip_ind.

Description: connect to a TCP or UDP server. 3.8 Disconnect

Disclaimer:void Disconnect ()

Parameters: None

back: none

Description: Disconnect the GPRS connection. 3.9 Send

statement:bool Send (string Buffer,int Overtime)

parameters:buffer– the string to send

overtime– and overtime are different, which is the timeout time to wait for the data to be sent successfully.

return: Send status bool succeeded false failed

Description: sends data to a TCP or UDP server. Only character forwarding is currently supported. 3.10 Receive

declaration:String Receive ()

Parameters: None

returns: returns the data sent back by a TCP or UDP server (all strings that return the current buffer at a maximum of 1024).

Description: data sent by a server that receives TCP or UDP. Only character data reception is currently supported. 3.11 SendMessage

Disclaimer:bool SendMessage (sring phone,string msg,int Overtime)

parameters:phone– phone number

msg– the string to send

overtime– and overtime are different, which is the timeout time to wait for the data to be sent successfully.

return: Send status bool succeeded false failed

Description: send SMS. Only character forwarding is currently supported. 3.12 ReceiveMessage

statement:string[] ReceiveMessage ()

Parameters: None

returns: returns a collection of text strings that are not currently read.

Note: receive SMS. Only character data reception is currently supported. 4 "Example"

Slightly

SOURCE/Document: Http://www.sky-walker.com.cn/MFRelease/library/YFSoft.Hardware.GPRS.rar

TCPServer: