File content as of revision 26:2b769ed8de4f:

#ifndef CELLULAR_H
#define CELLULAR_H

#include <string>
#include <vector>

#include "IPStack.h"
#include "MTSBufferedIO.h"
#include "CellUtils.h"

namespace mts
{

/** This is a class for communicating with a Cellular radio device.
* This class supports three main types of cellular radio interactions including:
* configuration and status processing, SMS processing, and TCP/UDP Socket
* data connections. This class also inherits from IPStack providing a common set of commands
* for communication devices that support IP protocols. It is also integrated with the standard
* mbed Sockets package and can therefore be used seamlessly with clients and services built
* on top of this interface already within the mbed library.
*
* For all examples below please change Pin Names to match your hardware configuration.
* It also assumes the use of RTS/CTS hardware handshaking using GPIOs. To disable this
* you will need to change settings on the radio module and and use the MTSSerial class
* instead of MTSSerialFlowControl.
*
* The following set of example code demonstrates how to send and receive configuration and
* status AT commands with the radio, create a data connection and test it:
* @code
* #include "mbed.h"
* #include "mtech.h"
*
* using namespace mts;
*
* main() {
*   //Setup serial interface to radio
*   MTSSerialFlowControl* serial = new MTSSerialFlowControl(YOUR_TXD, YOUR_RXD, YOUR_RTS, YOUR_CTS);
*   serial->baud(YOUR_BAUD);
*
*   //Setup Cellular class - Select your radio type
*   Cellular* cellular = new UniversalIP();
*   //Cellular cellular = new TelitIP();
*   cellular->init(serial);
*
*   //Run status and configuration commands
*   printf("\n\r////Start Status and Configuration Commands////\n\r");
*   printf("Command Test: %s\n\r", getCodeNames(cellular->test()).c_str());
*   wait(1);
*   printf("Signal Strength: %d\n\r", cellular->getSignalStrength());
*   wait(1);
*   printf("Registration State: %s\n\r", Cellular::getRegistrationNames(cellular->getRegistration()).c_str());
*   wait(1);
*   printf("Send Basic Command (AT): %s\n\r", getCodeNames(cellular->sendBasicCommand("AT", 1000)).c_str());
*   wait(1);
*   printf("Send Command (AT+CSQ): %s\n\r", cellular->sendCommand("AT+CSQ", 1000).c_str());
*   wait(1);
*
*   //Start Test
*   printf("\n\r////Start Network Connectivity Test////\n\r");
*   printf("Set APN: %s\n\r", getCodeNames(cellular->setApn("wap.cingular")).c_str()); //Use APN from service provider!!!
*
*   //Setup a data connection
*   printf("Attempting to Connect, this may take some time...\n\r");
*   while (!cellular->connect()) {
*       printf("Failed to connect... Trying again.\n\r");
*       wait(1);
*   }
*   printf("Connected to the Network!\n\r");
*
*   //Try pinging default server "8.8.8.8"
*   printf("Ping Valid: %s\n\r", cellular->ping() ? "true" : "false");
*
*   //Perform HTTP transfer over TCP socket connection
*   printf("Open Connection: %s\n\r", cellular->open("echo.200please.com", 80, IPStack::TCP) ? "Success" : "Failure");
*   printf("Performing HTTP GET on echo.200please.com\n\r");
*   string httpGET = "GET / HTTP/1.1\r\nHost: echo.200please.com\r\nConnection: keep-alive\r\n\r\n";
*   printf("Wrote %d of %d bytes\n\r", cellular->write(httpGET.data(), httpGET.size(), 2000), httpGET.size());
*   char buffer[256];
*   buffer[255] = '\0';
*   printf("Read %d bytes\n\r", cellular->read(buffer, 255, 2000));
*   printf("HTTP Response:\n\r %s", buffer);
*   wait(1);
*   printf("Close Connection: %s\n\r", cellular->close() ? "Success" : "Failure");
*
*   //Disconnect from network
*   printf("Disconnecting...\n\r");
*   cellular->disconnect();
*   printf("Is Connected: %s\n\r", cellular->isConnected() ? "True" : "False");
*
*   printf("End Program\n\r");
* }
* @endcode
*
* The following set of example code demonstrates how process SMS messages:
* @code
* #include "mbed.h"
* #include "mtech.h"
*
* using namespace mts;
*
* main() {
*   //Setup serial interface to radio
*   MTSSerialFlowControl* serial = new MTSSerialFlowControl(YOUR_TXD, YOUR_RXD, YOUR_RTS, YOUR_CTS);
*   serial->baud(YOUR_BAUD);
*
*   //Setup Cellular class
*   //Setup Cellular class - Select your radio type
*   Cellular* cellular = new UniversalIP();
*   //Cellular cellular = new TelitIP();
*   cellular->init(serial);
*
*   //Start test
*   printf("AT Test: %s\n\r", getCodeNames(cellular->test()).c_str());
*
*   //Waiting for network registration
*   printf("Checking Network Registration, this may take some time...\n\r");
*   while (cellular->getRegistration() != Cellular::REGISTERED) {
*       printf("Still waiting... Checking again.\n\r");
*       wait(1);
*   }
*   printf("Connected to the Network!\n\r");
*
*   //Send SMS Message
*   Code code;
*   std::string sMsg("Hello from Multi-Tech MBED!");
*   std::string sPhoneNum("16128675309"); //Put your phone number here or leave Jenny's...
*
*   printf("Sending message [%s] to [%s]\r\n", sMsg.c_str(), sPhoneNum.c_str());
*   code = cellular->sendSMS(sPhoneNum, sMsg);
*
*   if(code != SUCCESS) {
*       printf("Error during SMS send [%s]\r\n", getCodeNames(code).c_str());
*   } else {
*       printf("Success!\r\n");
*   }
*
*   //Try and receive SMS messages
*   //To determine your radio's phone number send yourself an SMS and check the received #
*   printf("Checking Received Messages\r\n");
*   while (true) {
*       std::vector<Cellular::Sms> vSms = cellular->getReceivedSms();
*       printf("\r\n");
*       for(unsigned int i = 0; i < vSms.size(); i++) {
*           printf("[%d][%s][%s][%s]\r\n", i, vSms[i].timestamp.c_str(),
*                vSms[i].phoneNumber.c_str(), vSms[i].message.c_str());
*       }
*       wait(10);
*   }
* }
* @endcode
*/

class Cellular : public IPStack
{
public:
    // Class ping paramter constants
    static const unsigned int PINGDELAY = 3; //Time to wait on each ping for a response before timimg out (seconds)
    static const unsigned int PINGNUM = 4; //Number of pings to try on ping command

    /// Enumeration for different cellular radio types.
    enum Radio {
        NA, MTSMC_H5, MTSMC_EV3, MTSMC_G3, MTSMC_C2, MTSMC_H5_IP, MTSMC_EV3_IP, MTSMC_C2_IP
    };

    /// An enumeration of radio registration states with a cell tower.
    enum Registration {
        NOT_REGISTERED, REGISTERED, SEARCHING, DENIED, UNKNOWN, ROAMING
    };

    /** This structure contains the data for an SMS message.
    */
    struct Sms {
        /// Message Phone Number
        std::string phoneNumber;
        /// Message Body
        std::string message;
        /// Message Timestamp
        std::string timestamp;
    };

    /** This method initializes the object with the underlying radio
    * interface to use. Note that this function MUST be called before
    * any other calls will function correctly on a Cellular object. Also
    * note that MTSBufferedIO is abstract, so you must use one of
    * its inherited classes like MTSSerial, MTSSerialFlowControl or write a class
    * similar to MTSSerialFlowControl which maps the MTSBufferedIO API
    * to your favorite serial library.
    *
    * @param io the io interface that is attached to the cellular radio.
    * @param DCD this is the dcd signal from the radio. If attached the
    * the pin must be passed in here for this class to operate correctly.
    * The default is not connected.
    * @param DTR this is the dtr signal from the radio. If attached the
    * the pin must be passed in here for this class to operate correctly.
    * The default is not connected.
    * @returns true if the init was successful, otherwise false.
    */
    virtual bool init(MTSBufferedIO* io);
    
    /** Sets up the physical connection pins
    *   (DTR,DCD, and RESET obviously)
    */
    bool configureSignals(unsigned int DCD = NC, unsigned int DTR = NC, unsigned int RESET = NC);

    /** A method for testing command access to the radio.  This method sends the
    * command "AT" to the radio, which is a standard radio test to see if you
    * have command access to the radio.  The function returns when it receives
    * the expected response from the radio.
    *
    * @returns the standard AT Code enumeration.
    */
    virtual Code test();

    /** A method for getting the signal strength of the radio. This method allows you to
    * get a value that maps to signal strength in dBm. Here 0-1 is Poor, 2-9 is Marginal,
    * 10-14 is Ok, 15-19 is Good, and 20+ is Excellent.  If you get a result of 99 the
    * signal strength is not known or not detectable.
    *
    * @returns an integer representing the signal strength.
    */
    virtual int getSignalStrength();

    /** This method is used to check the registration state of the radio with the cell tower.
    * If not appropriatley registered with the tower you cannot make a cellular connection.
    *
    * @returns the registration state as an enumeration type.
    */
    virtual Registration getRegistration();

    /** This method is used to set the radios APN if using a SIM card. Note that the APN
    * must be set correctly before you can make a data connection. The APN for your SIM
    * can be obtained by contacting your cellular service provider.
    *
    * @param the APN as a string.
    * @returns the standard AT Code enumeration.
    */
    virtual Code setApn(const std::string& apn)=0;

    /** This method is used to set the DNS which enables the use of URLs instead
    * of IP addresses when making a socket connection.
    *
    * @param the DNS server address as a string in form xxx.xxx.xxx.xxx.
    * @returns the standard AT Code enumeration.
    */
    virtual Code setDns(const std::string& primary, const std::string& secondary = "0.0.0.0");

    /** This method is used to send an SMS message. Note that you cannot send an
    * SMS message and have a data connection open at the same time.
    *
    * @param phoneNumber the phone number to send the message to as a string.
    * @param message the text message to be sent.
    * @returns the standard AT Code enumeration.
    */
    virtual Code sendSMS(const std::string& phoneNumber, const std::string& message);

    /** This method is used to send an SMS message. Note that you cannot send an
    * SMS message and have a data connection open at the same time.
    *
    * @param sms an Sms struct that contains all SMS transaction information.
    * @returns the standard AT Code enumeration.
    */
    virtual Code sendSMS(const Sms& sms);

    /** This method retrieves all of the SMS messages currently available for
    * this phone number.
    *
    * @returns a vector of existing SMS messages each as an Sms struct.
    */
    virtual std::vector<Cellular::Sms> getReceivedSms();

    /** This method can be used to remove/delete all received SMS messages
    * even if they have never been retrieved or read.
    *
    * @returns the standard AT Code enumeration.
    */
    virtual Code deleteAllReceivedSms();

    /** This method can be used to remove/delete all received SMS messages
    * that have been retrieved by the user through the getReceivedSms method.
    * Messages that have not been retrieved yet will be unaffected.
    *
    * @returns the standard AT Code enumeration.
    */
    virtual Code deleteOnlyReceivedReadSms();

    //Cellular Radio Specific
    /** A method for sending a generic AT command to the radio. Note that you cannot
    * send commands and have a data connection at the same time.
    *
    * @param command the command to send to the radio without the escape character.
    * @param timeoutMillis the time in millis to wait for a response before returning.
    * @param esc escape character to add at the end of the command, defaults to
    * carriage return (CR).  Does not append any character if esc == 0.
    * @returns all data received from the radio after the command as a string.
    */
    virtual std::string sendCommand(const std::string& command, unsigned int timeoutMillis, char esc = CR);

    /** A method for sending a basic AT command to the radio. A basic AT command is
    * one that simply has a response of either OK or ERROR without any other information.
    * Note that you cannot send commands and have a data connection at the same time.
    *
    * @param command the command to send to the radio without the escape character.
    * @param timeoutMillis the time in millis to wait for a response before returning.
    * @param esc escape character to add at the end of the command, defaults to
    * carriage return (CR).
    * @returns the standard Code enumeration.
    */
    virtual Code sendBasicCommand(const std::string& command, unsigned int timeoutMillis, char esc = CR);

    /** A static method for getting a string representation for the Registration
    * enumeration.
    *
    * @param code a Registration enumeration.
    * @returns the enumeration name as a string.
    */
    static std::string getRegistrationNames(Registration registration);

    /** A static method for getting a string representation for the Radio
    * enumeration.
    *
    * @param type a Radio enumeration.
    * @returns the enumeration name as a string.
    */
    static std::string getRadioNames(Radio radio);

protected:
    MTSBufferedIO* io; //IO interface obect that the radio is accessed through.
    bool echoMode; //Specifies if the echo mode is currently enabled.

    bool pppConnected; //Specifies if a PPP session is currently connected.
    std::string apn; //A string that holds the APN for the radio.

    Radio type; //The type of radio being used

    Mode socketMode; //The current socket Mode.
    bool socketOpened; //Specifies if a Socket is presently opened.
    bool socketCloseable; //Specifies is a Socket can be closed.
    unsigned int local_port; //Holds the local port for socket connections.
    std::string local_address; //Holds the local address for socket connections.
    unsigned int host_port; //Holds the remote port for socket connections.
    std::string host_address; //Holds the remote address for socket connections.

    DigitalIn* dcd; //Maps to the radio's dcd signal
    DigitalOut* dtr; //Maps to the radio's dtr signal
    DigitalOut* resetLine; //Maps to the radio's reset signal 
};

}

#endif /* CELLULAR_H */