gprs.cpp

/*
    gprs.cpp
    A library for SeeedStudio seeeduino GPRS shield

    Copyright (c) 2013 seeed technology inc.
    Author        :   lawliet zou
    Create Time   :   Dec 2013
    Change Log    :   2017-05-31 GPRS::readSMS modified to support SMS international
                     increment the buffer to read the whole message
                     Jose Zorrilla (jzorrilla@x-red.com)

    The MIT License (MIT)

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#include <stdio.h>
#include "gprs.h"

int GPRS::init(void) {
    #if 0
    for (int i = 0; i < 2; i++) {
        sendCmd("AT\r\n");
        delay(100);
    }
    sendCmd("AT+CFUN=1\r\n");
    if (0 != checkSIMStatus()) {
        ERROR("ERROR:checkSIMStatus");
        return -1;
    }
    return 0;

    #endif
    if (sendCmdAndWaitForResp("AT\r\n", "OK\r\n", DEFAULT_TIMEOUT * 3)) {
        return -1;
    }
    if (sendCmdAndWaitForResp("AT+CFUN=1\r\n", "OK\r\n", DEFAULT_TIMEOUT * 3)) {
        return -1;
    }
    if (checkSIMStatus()) {
        return -1;
    }
    return 0;

}

bool GPRS::join(const char* apn, const char* userName, const char* passWord) {
    char cmd[64];
    char ipAddr[32];
    char gprsBuffer[32];

    //Select multiple connection
    //sim900_check_with_cmd("AT+CIPMUX=1\r\n","OK",DEFAULT_TIMEOUT,CMD);

    cleanBuffer(ipAddr, 32);
    sendCmd("AT+CIFSR\r\n");
    readBuffer(ipAddr, 32, 2);

    // If no IP address feedback than bring up wireless
    if (NULL != strstr(ipAddr, "ERROR")) {
        if (0 != sendCmdAndWaitForResp("AT+CSTT?\r\n", apn, DEFAULT_TIMEOUT)) {
            sendCmd("AT+CSTT=\"");
            sendCmd(apn);
            sendCmd("\",\"");
            sendCmd(userName);
            sendCmd("\",\"");
            sendCmd(passWord);
            sendCmdAndWaitForResp("\"\r\n", "OK\r\n", DEFAULT_TIMEOUT * 3);
        }

        //Brings up wireless connection
        sendCmd("AT+CIICR\r\n");

        //Get local IP address
        cleanBuffer(ipAddr, 32);
        sendCmd("AT+CIFSR\r\n");
        readBuffer(ipAddr, 32, 2);
    }
    #if 0
    Serial.print("ipAddr: ");
    Serial.println(ipAddr);
    #endif

    if (NULL != strstr(ipAddr, "AT+CIFSR")) {
        _ip = str_to_ip(ipAddr + 11);
        if (_ip != 0) {
            return true;
        }
    }
    return false;
}

uint32_t GPRS::str_to_ip(const char* str) {
    uint32_t ip = 0;
    char* p = (char*)str;

    for (int i = 0; i < 4; i++) {
        ip |= atoi(p);
        p = strchr(p, '.');
        if (p == NULL) {
            break;
        }
        if (i < 3) {
            ip <<= 8;
        }
        p++;
    }
    return ip;
}

//HACERR lo de la IP gasta muuuucho espacio (ver .h y todo esto)
char* GPRS::getIPAddress() {
    uint8_t a = (_ip >> 24) & 0xff;
    uint8_t b = (_ip >> 16) & 0xff;
    uint8_t c = (_ip >> 8) & 0xff;
    uint8_t d = _ip & 0xff;

    snprintf(ip_string, sizeof(ip_string), "%d.%d.%d.%d", a, b, c, d);
    return ip_string;
}

int GPRS::checkSIMStatus(void) {
    char gprsBuffer[32];
    int count = 0;
    cleanBuffer(gprsBuffer, 32);
    while (count < 3) {
        sendCmd("AT+CPIN?\r\n");
        readBuffer(gprsBuffer, 32, DEFAULT_TIMEOUT);
        if ((NULL != strstr(gprsBuffer, "+CPIN: READY"))) {
            break;
        }
        count++;
        delay(300);
    }
    if (count == 3) {
        return -1;
    }
    return 0;
}

int GPRS::networkCheck(void) {
    delay(1000);
    if (0 != sendCmdAndWaitForResp("AT+CGREG?\r\n", "+CGREG: 0,1", DEFAULT_TIMEOUT * 3)) {
        ERROR("ERROR:CGREG");
        return -1;
    }
    delay(1000);
    if (0 != sendCmdAndWaitForResp("AT+CGATT?\r\n", "+CGATT: 1", DEFAULT_TIMEOUT)) {
        ERROR("ERROR:CGATT");
        return -1;
    }
    return 0;
}

int GPRS::sendSMS(char* number, char* data) {
    char cmd[32];
    if (0 != sendCmdAndWaitForResp("AT+CMGF=1\r\n", "OK", DEFAULT_TIMEOUT)) { // Set message mode to ASCII
        ERROR("ERROR:CMGF");
        return -1;
    }
    delay(500);
    snprintf(cmd, sizeof(cmd), "AT+CMGS=\"%s\"\r\n", number);
    if (0 != sendCmdAndWaitForResp(cmd, ">", DEFAULT_TIMEOUT)) {
        ERROR("ERROR:CMGS");
        return -1;
    }
    delay(1000);
    serialSIM800.write(data);
    delay(500);
    sendEndMark();
    return 0;
}

int GPRS::readSMS(int messageIndex, char* message, int length) {
    int i = 0;
    char gprsBuffer[144]; // Buffer size for the SMS message
    char cmd[16];
    char* p, *s;

    sendCmdAndWaitForResp("AT+CMGF=1\r\n", "OK", DEFAULT_TIMEOUT);
    delay(1000);
    sprintf(cmd, "AT+CMGR=%d\r\n", messageIndex);
    serialSIM800.write(cmd);
    cleanBuffer(gprsBuffer, 144);
    readBuffer(gprsBuffer, 144, DEFAULT_TIMEOUT);

    if (NULL != (s = strstr(gprsBuffer, "+CMGR"))) {
        if (NULL != (s = strstr(gprsBuffer, "REC"))) { // Search the beginning of the SMS message
            p = s - 1;
            while ((i < length - 1)) {
                message[i++] = *(p++);
            }
            message[i] = '\0';
        }
    }
    return 0;
}

int GPRS::deleteSMS(int index) {
    char cmd[16];
    snprintf(cmd, sizeof(cmd), "AT+CMGD=%d\r\n", index);
    sendCmd(cmd);
    return 0;
}

int GPRS::callUp(char* number) {
    char cmd[24];
    if (0 != sendCmdAndWaitForResp("AT+COLP=1\r\n", "OK", 5)) {
        ERROR("COLP");
        return -1;
    }
    delay(1000);
    sprintf(cmd, "\r\nATD%s;\r\n", number);
    serialSIM800.write(cmd);
    return 0;
}

int GPRS::answer(void) {
    serialSIM800.write("ATA\r\n");
    return 0;
}

int GPRS::connectTCP(const char* ip, int port) {
    char cipstart[50];
    sprintf(cipstart, "AT+CIPSTART=\"TCP\",\"%s\",\"%d\"\r\n", ip, port);
    if (0 != sendCmdAndWaitForResp(cipstart, "CONNECT OK", 2 * DEFAULT_TIMEOUT)) { // connect tcp
        ERROR("ERROR:CIPSTART");
        return -1;
    }

    return 0;
}
int GPRS::sendTCPData(char* data) {
    char cmd[32];
    int len = strlen(data);
    snprintf(cmd, sizeof(cmd), "AT+CIPSEND=%d\r\n", len);
    if (0 != sendCmdAndWaitForResp(cmd, ">", 2 * DEFAULT_TIMEOUT)) {
        ERROR("ERROR:CIPSEND");
        return -1;
    }

    if (0 != sendCmdAndWaitForResp(data, "SEND OK", 2 * DEFAULT_TIMEOUT)) {
        ERROR("ERROR:SendTCPData");
        return -1;
    }
    return 0;
}

int GPRS::closeTCP(void) {
    sendCmd("AT+CIPCLOSE\r\n");
    return 0;
}

int GPRS::shutTCP(void) {
    sendCmd("AT+CIPSHUT\r\n");
    return 0;
}