How to use AT command to send SMS?

# include & ltstdlib.h & gt

# include & ltunistd.h & gt

# include & ltsys/types . h & gt；

# include & ltsys/stat . h & gt；

# include & ltfcntl.h & gt

# include & lttermios.h & gt

# include & lt error number & gt

# include & lticonv.h & gt？ //code conversion

# Definition? STTY_DEV？ "/dev/ttyS0 "

# Definition? BUFF_SIZE？ 5 12

# Definition? MSG_SIZE？ 140// capacity of short messages

Charles? Tel [20] = "+8613476090094"; //Define the target mobile phone number for sending SMS.

Charles? SMS _ number[20]= "+86 13800200500 "； //Define the number of short message service centers.

Charles? Sms_gb23 12[MSG_SIZE]= "the best? Greetings! ”； ? //Define the content of the short message

Charles? SMS _ utf8[MSG _ SIZE]；

Charles? * SMS _ in = SMS _ GB 23 12； //Convert the input gb23 12 code into unicode code.

Charles? * sms _ out = sms _ utf8

int？ gb23 12_len，？ utf8 _ len

int？ SetOption(int？ FD)； ? //Set the parameters of serial communication

Invalid? TransPhone()； ? //Convert the cell phone number format

Invalid? trans MSC()； //Convert SMSC number

int？ TransMsg()； ? //Convert SMS content

int？ Master ()

{

int？ stty_fd，n；

Charles? buffer[BUFF _ SIZE]；

//Open the serial port

stty_fd=open(STTY_DEV，O _ RDWR)；

if(- 1==stty_fd){

Perror ("open? Equipment ");

Return? 0;

}

Printf ("Open? Equipment? Success! \ n ")；

//Set serial port parameters

If (0! =SetOption(stty_fd)){

close(stty _ FD)；

Return? 0;

}

printf("Set？ Serial? Options? Success! \ n ")；

TransPhone()；

trans MSC()；

If (1! =TransMsg()){

Perror ("convert? short msg ")；

close(stty _ FD)；

Return? 0;

}

Printf ("Message? Convert? Success! \ n ")；

//Set the PDU mode.

strcpy(buffer，" AT+CMGF = 0 \ n ")； //0 means PDU mode, 1 means text mode.

write(stty_fd，buffer，strlen(buffer))； //Write configuration command

n=read(stty_fd，buffer，BUFF _ SIZE)； //After writing AT+CMGF=0 into the serial port, if the system supports PDU mode, return returns "OK" to the serial port.

If (n < = 0) {

Perror ("set? pdu？ Mode ");

close(stty _ FD)；

Return? 0;

}

If (0! =strncmp(buffer，" OK "，2)){

Perror ("set? pdu？ Mode ");

close(stty _ FD)；

Return? 0;

}

//Send a message

sprintf(buffer，" AT+CMGS=%d\n "，utf8 _ len)； //Write a message command

write(stty_fd，buffer，strlen(buffer))；

write(stty_fd，sms_utf8，utf8 _ len)； //Write the message content

Printf ("Send? Leave a message All right! \ n ")；

close(stty _ FD)；

}

int？ SetOption(int？ fd)

{

struct？ termios？ opt

//Get the current serial port configuration

tcgetattr(FD & amp； opt)；

tcflush(fd，TCIOFLUSH)；

//Set the baud rate

cfsetispeed(& amp； opt，b 19200)；

cfsetospeed(& amp； opt，b 19200)；

//Set data bits -8 data bits

opt.c_cflag？ & amp=? ~ CSIZE

opt.c_cflag？ |=? CS8；

//Set parity-no parity.

opt.c_cflag？ & amp=? ~ PARENB

opt.c_iflag？ & amp=? ~ INPCK

//Set stop bit-1 stop bit

opt.c_cflag？ & amp=? ~ CSTOPB

//Set timeout-15 seconds

opt . c _ cc[VTIME]= 150；

opt . c _ cc[VMIN]= 0；

//Set the writing device

If (0! =tcsetattr(fd，TCSANOW，& ampopt)){

Perror ("set? Podrat ");

Return? - 1;

}

tcflush(fd，TCIOFLUSH)；

Return? 0;

}

Invalid? Microphone ()

{

int？ I，str_len，tmp

If(phone[0]='+'){// Delete the'+'at the beginning of the number.

for(I = 0； I & ltstrlen (telephone)-1; I++)//strlen function gets the actual length of the character array, excluding the following' \0'.

Telephone [I]= telephone [I+1];

phone[I]= ' \ 0 '；

}

Str_len=strlen (telephone); ? //If the number (excluding'+') is odd, add' f' at the end.

if((strlen(phone)%2)！ =0){

phone[str _ len]= ' F '；

phone[str _ len+ 1]= ' \ 0 '；

}

for(I = 0； I & ltstrlen (telephone); I+=2){// Exchange odd and even digits of numbers.

tmp = phone[I]；

Telephone [I]= telephone [I+1];

Telephone [I+1] = tmp;

}

}

Invalid? TransSmsc()

{

int？ I，str_len，tmp

TransPhone(SMS _ number)；

str _ len = strlen(SMS _ number)； ? //All characters are moved back two bytes.

for(I = strlen(SMS _ number)+2； Me! =0; I-)

SMS number [I]= SMS number [I-2];

SMS _ number[str _ len+3]= ' \ 0 '；

strncpy(sms_number，" 9 1 "，2)； ? //Start with "9 1".

tmp = strlen(SMS _ number)/2；

str _ len = strlen(SMS _ number)； ? //All characters are moved back two bytes.

for(I = strlen(SMS _ number)+2； Me! =0; I-)

SMS number [I]= SMS number [I-2];

SMS _ number[str _ len+3]= ' \ 0 '；

SMS _ number[0]=(char)(tmp/ 10)+0x 30； ? //Convert the string length value from plastic to characters and write it at the beginning of the short message string.

SMS _ number[ 1]=(char)(tmp % 10)+0x 30；

}

int？ TransMsg()

{

iconv_t？ cd=iconv_open("utf-8 "，" GB 23 12 ")； //Set the type conversion GB 2312 = = > utf-8

if(0==cd){

Perror ("Create? iconv？ Handle! ”);

Return? 0;

}

GB 23 12 _ len = strlen(SMS _ GB 23 12)；

utf8 _ len = MSG _ SIZE

If(- 1==iconv(cd,& input & gb2312 _ len&; SMS _ out & amp； utf8_len)){

Perror ("convert? Code ");

Return? 0;

}

iconv _ close(CD)；

Return? 1;

}