File content as of revision 13:0af863114629:

#ifndef CELLULAR_CPP
#define CELLULAR_CPP

#include "Cellular.h"
#include "MTSText.h"
#include <sstream>

Cellular::Cellular(MTSBufferedIO& io) 
: io(io)
, echoMode(true)
, pppConnected(false)
, mode(TCP)
, socketOpened(false)
, local_port(0)
, host_port(0)
{
}

Cellular::~Cellular()
{
}

bool Cellular::connect() {
    //Check if socket is open
    if(socketOpened) {
        return true;   
    }
    
    //Run Test first to validate a good state
    if(isConnected()) {
        return true;
    }
    
    //Check RSSI: AT+CSQ    
    int rssi = getSignalStrength();
    printf("[DEBUG] Signal strength: %d\n", rssi);
    
    //Check Registration: AT+CREG? == 0,1
    Registration registration = getRegistration();
    if(registration != REGISTERED) {
        printf("[WARNING] Not Registered [%d]\n", (int)registration);    
    }
    
    //AT#CONNECTIONSTART: Make a PPP connection
    printf("[DEBUG] Making PPP Connection Attempt. APN[%s]\n", apn.c_str());
    std::string pppResult = sendCommand("AT#CONNECTIONSTART", 120000);
    
    printf("[DEBUG] PPP CONNECT RESULT [%s]\n", pppResult.c_str());
           
    std::vector<std::string> parts = Text::split(pppResult, "\r\n");
    for(uint32_t i = 0; i < parts.size(); i++) {
        printf("[%d] [%s]\r\n", i, parts[i].c_str());   
    }
    
           
    if(pppResult.find("Ok_Info_GprsActivation") != std::string::npos) {
        if(parts.size() >= 2) {
            local_address = parts[1];   
        }
        printf("[INFO] PPP Connection Established: IP[%s]\n", local_address.c_str());
        pppConnected = true;
        
    } else {
        pppConnected = false;   
    }
    
    return pppConnected;
}

void Cellular::disconnect() {
    
}

bool Cellular::isConnected() {
    //1) Check if APN was set
    if(apn.size() == 0) {
        printf("[DEBUG] APN is not set\n");
        return false;
    }
    
    //1) Check that we do not have a live connection up
    if(socketOpened) {
        printf("[DEBUG] Socket is opened\n");
        return true;
    }
    //2) Query the radio
    pppConnected = false;
    std::string result = sendCommand("AT#VSTATE", 1000);
    if(result.find("CONNECTED") != std::string::npos) {
        pppConnected = true;
    }
    
    return pppConnected;
}

bool Cellular::bind(unsigned int port) {
    return false;
}

bool Cellular::open(const std::string& address, unsigned int port, Mode mode) {
    Code portCode, addressCode;
    
    //1) Check that we do not have a live connection up
    if(socketOpened) {
        printf("[DEBUG] Socket already opened\n");
        return true;
    }
    
    //2) Check PPP connection
    if(!isConnected()) {
        printf("[ERROR] PPP not established.  Attempting to connect\n");
        if(!connect()) {
            printf("[ERROR] PPP connection failed\n");
            return false;
        } else {
            printf("[DEBUG] PPP connection established\n");
        }
    }
    
    //Setup IP Connection
    std::stringstream ss;    
    if(mode == TCP) {
        ss << "AT#TCPPORT=1," << port;
        portCode = sendBasicCommand(ss.str(), 1000);
        addressCode = sendBasicCommand("AT#TCPSERV=1," + address, 1000);
    } else {
        ss << "AT#UDPPORT=1," << port;
        portCode = sendBasicCommand(ss.str(), 1000);
        addressCode = sendBasicCommand("AT#UDPSERV=1," + address, 1000);
    }
    
    if(portCode == OK) {
        host_port = port;
    } else {
        printf("[ERROR] Host port could not be set\n");
    }
    
    if(addressCode == OK) {
        host_address = address;
    } else {
        printf("[ERROR] Host address could not be set\n");
    }
    
    // Try and Connect
    string response = sendCommand("AT#OTCP=1", 30000);
    if (response.find("Ok_Info_WaitingForData") != string::npos) {
        printf("[INFO] Opened TCP Socket [%s:%d]\n", address.c_str(), port);
        socketOpened = true;
    } else {
        printf("[WARNING] Unable to open TCP Socket [%s:%d]\n", address.c_str(), port);
        socketOpened = false;
    }
        
    return socketOpened;
}

bool Cellular::isOpen() {
    return false;
}

void Cellular::close() {
    if(!socketOpened) {
        return;
    }
    
    //Build Escape Message => DLE ETX
    char buffer[3] = { 0x10, 0x03, 0x00 };
    Code code = sendBasicCommand(buffer, 1000, NONE);
    if(code != OK) {
        printf("[WARNING] Radio did not accept close socket command");
        //Handle cleanup   
    }
    socketOpened = false;    
}

int Cellular::read(char* data, int max, int timeout) {
    return -1;
}

int Cellular::write(char* data, int length, int timeout) {
    return -1;
}

unsigned int Cellular::readable() {
    return 0;
}

unsigned int Cellular::writeable() {
    return 0;
}

void Cellular::reset() {
    
}

Cellular::Code Cellular::test()
{
    Code code = sendBasicCommand("AT", 1000);
    
    if(code != OK) {
        printf("[Error] Failed basic AT command");
        return code;
    }

    //AT#VSTATE != "CHECKING"
    
    //AT#GPRSMODE == 
    return OK;
}

Cellular::Code Cellular::echoOff(bool state)
{
    Code code;
    if (state) {
        code = sendBasicCommand("ATE0", 1000);
        echoMode = (code == OK) ? false : echoMode;
    } else {
        code = sendBasicCommand("ATE1", 1000);
        echoMode = (code == OK) ? true : echoMode;
    }
    return code;
}

int Cellular::getSignalStrength()
{
    string response = sendCommand("AT+CSQ", 1000);
    if (response.find("OK") == string::npos) {
        return -1;
    }
    int start = response.find(':');
    int stop = response.find(',', start);
    string signal = response.substr(start + 2, stop - start - 2);
    int value;
    sscanf(signal.c_str(), "%d", &value);
    return value;
}

std::string Cellular::getPhoneNumber() {
    return "unknown";
}

Cellular::Registration Cellular::getRegistration()
{
    string response = sendCommand("AT+CREG?", 1000);
    if (response.find("OK") == string::npos) {
        return UNKNOWN;
    }
    int start = response.find(',');
    int stop = response.find(' ', start);
    string regStat = response.substr(start + 1, stop - start - 1);
    int value;
    sscanf(regStat.c_str(), "%d", &value);
    switch (value) {
        case 0:
            return NOT_REGISTERED;
        case 1:
            return REGISTERED;
        case 2:
            return SEARCHING;
        case 3:
            return DENIED;
        case 4:
            return UNKNOWN;
        case 5:
            return ROAMING;
    }
    return UNKNOWN;
}

Cellular::Code Cellular::sendBasicCommand(string command, int timeoutMillis, ESC_CHAR esc)
{
    string response = sendCommand(command, timeoutMillis, esc);
    if (response.size() == 0) {
        return NO_RESPONSE;
    } else if (response.find("OK") != string::npos) {
        return OK;
    } else if (response.find("ERROR") != string::npos) {
        return ERROR;
    } else {
        return FAILURE;
    }
}

Cellular::Code Cellular::setApn(const std::string& apn) {
    Code code = sendBasicCommand("AT#APNSERV=\"" + apn + "\"", 1000);
    if (code != OK) {
        return code;
    }
    this->apn = apn;
    return code;
}

Cellular::Code Cellular::setDns(const std::string& apn) {
    return FAILURE;   
}

Cellular::Code Cellular::sendSMS(const Sms& sms) {
    return sendSMS(sms.phoneNumber, sms.message);
}

Cellular::Code Cellular::sendSMS(const std::string& phoneNumber, const std::string& message)
{
    Code code = sendBasicCommand("AT+CMGF=1", 1000);
    if (code != OK) {
        return code;
    }
    string cmd = "AT+CMGS=\"+";
    cmd.append(phoneNumber);
    cmd.append("\"");
    string response1 = sendCommand(cmd, 1000);
    if (response1.find('>') == string::npos) {
        return NO_RESPONSE;
    }
    wait(.2);
    string  response2 = sendCommand(message, 4000, CTRL_Z);
    printf("SMS Response: %s\n", response2.c_str());
    if (response2.find("+CMGS:") == string::npos) {
        return FAILURE;
    }
    return OK;
}

std::vector<Cellular::Sms> Cellular::getReceivedSms() {
    int smsNumber = 0;
    std::vector<Sms> vSms;
    std::string received = sendCommand("AT+CMGL=\"ALL\"", 4000);
    size_t pos = received.find("+CMGL: ");
    
    while (pos != std::string::npos) {
        Cellular::Sms sms;
        std::string line(Text::getLine(received, pos, pos));
        //printf("[DEBUG] Top of SMS Parse Loop. LINE[%s]\n", line.c_str());
        if(line.find("+CMGL: ") == std::string::npos) {           
            continue;
        }
        
        //Start of SMS message
        std::vector<std::string> vSmsParts = Text::split(line, ',');
        if(vSmsParts.size() != 6) {
            printf("[WARNING] Expected 6 commas. SMS[%d] DATA[%s]. Continuing ...\n", smsNumber, line.c_str());
            continue;
        }
        
        sms.phoneNumber = vSmsParts[2];
        sms.timestamp = vSmsParts[4] + ", " + vSmsParts[5];
        
        if(pos == std::string::npos) {
            printf("[WARNING] Expected SMS body. SMS[%d]. Leaving ...\n", smsNumber);
            break;
        }
        //Check for the start of the next SMS message
        size_t bodyEnd = received.find("\r\n+CMGL: ", pos);
        if(bodyEnd == std::string::npos) {
            //printf("[DEBUG] Parsing Last SMS. SMS[%d]\n", smsNumber);
            //This must be the last SMS message
            bodyEnd = received.find("\r\n\r\nOK", pos);
        }
        
        //Safety check that we found the boundary of this current SMS message
        if(bodyEnd != std::string::npos) {
            sms.message = received.substr(pos, bodyEnd - pos);
        } else {
            sms.message = received.substr(pos);
            printf("[WARNING] Expected to find end of SMS list. SMS[%d] DATA[%s].\n", smsNumber, sms.message.c_str());
        }
        vSms.push_back(sms);
        pos = bodyEnd;
        //printf("[DEBUG] Parsed SMS[%d].  Starting Next at position [%d]\n", smsNumber, pos);
        smsNumber++;
    }
    printf("Received %d SMS\n", smsNumber);
    return vSms;
}

Cellular::Code Cellular::deleteOnlyReceivedReadSms() {
    return sendBasicCommand("AT+CMGD=1,1", 1000);
}

Cellular::Code Cellular::deleteAllReceivedSms() {
    return sendBasicCommand("AT+CMGD=1,4", 1000);
}


string Cellular::sendCommand(string command, int timeoutMillis, ESC_CHAR esc)
{
    int size = command.size() + 1;
    char cmd[size];
    strcpy(cmd, command.c_str());
    if (esc == CR) {
        cmd[size -1] = '\r';
    } else if (esc == CTRL_Z) {
        cmd[size -1] = 0x1A;
    } else if(esc == NONE) {
        cmd[size -1] = '\0';
    }

    io.rxClear();
    io.txClear();
    std::string result;
    int status = io.write(cmd, size);
    int available = io.rxAvailable();
    int previous = -1;
    int timer = 0;
    char tmp[256];
    tmp[255] = 0;
    bool started = !echoMode;
    bool done = false;
    do {
        wait(.1);
        timer = timer + 100;
        previous = available;
        available = io.rxAvailable();

        int size = io.read(tmp,255);    //1 less than allocated
        if(size > 0) {
            result.append(tmp, size);
        }
        
        if(!started) {
            //In Echo Mode (Command will have echo'd + 2 characters for \r\n)
            if(result.size() > command.size() + 2) {
                started = true;
            }
        } else {
            done =  (available == previous);
        }
        if(timer >= timeoutMillis) {
            printf("[WARNING] sendCommand timed out after %d milliseconds\n", timeoutMillis);
            done = true;
        }
    } while (!done);
    
    return result;
}

#endif /* CELLULAR_CPP */