TinyGsmClientESP8266.h

 
#ifndef TinyGsmClientESP8266_h
#define TinyGsmClientESP8266_h
 
//#define TINY_GSM_DEBUG Serial
 
#if !defined(TINY_GSM_RX_BUFFER)
#define TINY_GSM_RX_BUFFER 512
#endif
 
#define TINY_GSM_MUX_COUNT 5
 
#include "TinyGsmCommon.h"
 
#define GSM_NL "\r\n"
static const char GSM_OK[] TINY_GSM_PROGMEM = "OK" GSM_NL;
static const char GSM_ERROR[] TINY_GSM_PROGMEM = "ERROR" GSM_NL;
static unsigned TINY_GSM_TCP_KEEP_ALIVE = 120;
 
class TinyGsm
{
 
public:
 
    class GsmClient : public Client
    {
        friend class TinyGsm;
        typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;
 
    public:
        GsmClient() {}
 
        GsmClient(TinyGsm& modem, uint8_t mux = 1)
        {
            init(&modem, mux);
        }
 
        bool init(TinyGsm* modem, uint8_t mux = 1)
        {
            this->at = modem;
            this->mux = mux;
            sock_connected = false;
 
            at->sockets[mux] = this;
 
            return true;
        }
 
    public:
        virtual int connect(const char *host, uint16_t port)
        {
            stop();
            TINY_GSM_YIELD();
            rx.clear();
            sock_connected = at->modemConnect(host, port, mux);
            return sock_connected;
        }
 
        virtual int connect(IPAddress ip, uint16_t port)
        {
            String host;
            host.reserve(16);
            host += ip[0];
            host += ".";
            host += ip[1];
            host += ".";
            host += ip[2];
            host += ".";
            host += ip[3];
            return connect(host.c_str(), port);
        }
 
        virtual void stop()
        {
            TINY_GSM_YIELD();
            at->sendAT(GF("+CIPCLOSE="), mux);
            sock_connected = false;
            at->waitResponse();
            rx.clear();
        }
 
        virtual size_t write(const uint8_t *buf, size_t size)
        {
            TINY_GSM_YIELD();
            //at->maintain();
            return at->modemSend(buf, size, mux);
        }
 
        virtual size_t write(uint8_t c)
        {
            return write(&c, 1);
        }
 
        virtual int available()
        {
            TINY_GSM_YIELD();
            if (!rx.size() && sock_connected) {
                at->maintain();
            }
            return rx.size();
        }
 
        virtual int read(uint8_t *buf, size_t size)
        {
            TINY_GSM_YIELD();
            size_t cnt = 0;
            while (cnt < size) {
                size_t chunk = TinyGsmMin(size-cnt, rx.size());
                if (chunk > 0) {
                    rx.get(buf, chunk);
                    buf += chunk;
                    cnt += chunk;
                    continue;
                }
                // TODO: Read directly into user buffer?
                if (!rx.size() && sock_connected) {
                    at->maintain();
                    //break;
                }
            }
            return cnt;
        }
 
        virtual int read()
        {
            uint8_t c;
            if (read(&c, 1) == 1) {
                return c;
            }
            return -1;
        }
 
        virtual int peek()
        {
            return -1;    //TODO
        }
        virtual void flush()
        {
            at->stream.flush();
        }
 
        virtual uint8_t connected()
        {
            if (available()) {
                return true;
            }
            return sock_connected;
        }
        virtual operator bool()
        {
            return connected();
        }
 
        /*
         * Extended API
         */
 
        String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;
 
    private:
        TinyGsm*      at;
        uint8_t       mux;
        bool          sock_connected;
        RxFifo        rx;
    };
 
    class GsmClientSecure : public GsmClient
    {
    public:
        GsmClientSecure() {}
 
        GsmClientSecure(TinyGsm& modem, uint8_t mux = 1)
            : GsmClient(modem, mux)
        {}
 
    public:
        virtual int connect(const char *host, uint16_t port)
        {
            stop();
            TINY_GSM_YIELD();
            rx.clear();
            sock_connected = at->modemConnect(host, port, mux, true);
            return sock_connected;
        }
    };
 
public:
 
    explicit TinyGsm(Stream& stream)
        : stream(stream)
    {
        memset(sockets, 0, sizeof(sockets));
    }
 
    /*
     * Basic functions
     */
    bool begin()
    {
        return init();
    }
 
    bool init()
    {
        if (!testAT()) {
            return false;
        }
        sendAT(GF("E0"));   // Echo Off
        if (waitResponse() != 1) {
            return false;
        }
        return true;
    }
 
    void setBaud(unsigned long baud)
    {
        sendAT(GF("+IPR="), baud);
    }
 
    bool testAT(unsigned long timeout = 10000L)
    {
        for (unsigned long start = millis(); millis() - start < timeout; ) {
            sendAT(GF(""));
            if (waitResponse(200) == 1) {
                delay(100);
                return true;
            }
            delay(100);
        }
        return false;
    }
 
    void maintain()
    {
        waitResponse(10, NULL, NULL);
    }
 
    bool factoryDefault()
    {
        sendAT(GF("+RESTORE"));
        return waitResponse() == 1;
    }
 
    String getModemInfo()
    {
        sendAT(GF("+GMR"));
        String res;
        if (waitResponse(1000L, res) != 1) {
            return "";
        }
        res.replace(GSM_NL "OK" GSM_NL, "");
        res.replace(GSM_NL, " ");
        res.trim();
        return res;
    }
 
    bool hasSSL()
    {
        return true;
    }
 
    /*
     * Power functions
     */
 
    bool restart()
    {
        if (!testAT()) {
            return false;
        }
        sendAT(GF("+RST"));
        if (waitResponse(10000L) != 1) {
            return false;
        }
        if (waitResponse(10000L, GF(GSM_NL "ready" GSM_NL)) != 1) {
            return false;
        }
        delay(500);
        return init();
    }
 
 
    /*
     * Generic network functions
     */
 
    int getSignalQuality()
    {
        sendAT(GF("+CWJAP_CUR?"));
        int res1 = waitResponse(GF("No AP"), GF("+CWJAP_CUR:"));
        if (res1 != 2) {
            waitResponse();
            return 0;
        }
        streamSkipUntil(',');  // Skip SSID
        streamSkipUntil(',');  // Skip BSSID/MAC address
        streamSkipUntil(',');  // Skip Chanel number
        int res2 = stream.parseInt();  // Read RSSI
        waitResponse();  // Returns an OK after the value
        return res2;
    }
 
    bool isNetworkConnected()
    {
        sendAT(GF("+CIPSTATUS"));
        int res1 = waitResponse(3000, GF("STATUS:"));
        int res2 = 0;
        if (res1 == 1) {
            res2 = waitResponse(GFP(GSM_ERROR), GF("2"), GF("3"), GF("4"), GF("5"));
        }
        // <stat> status of ESP8266 station interface
        // 2 : ESP8266 station connected to an AP and has obtained IP
        // 3 : ESP8266 station created a TCP or UDP transmission
        // 4 : the TCP or UDP transmission of ESP8266 station disconnected (but AP is connected)
        // 5 : ESP8266 station did NOT connect to an AP
        waitResponse();  // Returns an OK after the status
        if (res2 == 2 || res2 == 3 || res2 == 4) {
            return true;
        } else {
            return false;
        }
    }
 
    bool waitForNetwork(unsigned long timeout = 60000L)
    {
        for (unsigned long start = millis(); millis() - start < timeout; ) {
            sendAT(GF("+CIPSTATUS"));
            int res1 = waitResponse(3000, GF("busy p..."), GF("STATUS:"));
            if (res1 == 2) {
                int res2 = waitResponse(GFP(GSM_ERROR), GF("2"), GF("3"), GF("4"), GF("5"));
                if (res2 == 2 || res2 == 3 || res2 == 4) {
                    waitResponse();
                    return true;
                }
            }
            delay(250);
        }
        return false;
    }
 
    /*
     * WiFi functions
     */
    bool networkConnect(const char* ssid, const char* pwd)
    {
 
        sendAT(GF("+CIPMUX=1"));
        if (waitResponse() != 1) {
            return false;
        }
 
        sendAT(GF("+CWMODE_CUR=1"));
        if (waitResponse() != 1) {
            return false;
        }
 
        sendAT(GF("+CWJAP_CUR=\""), ssid, GF("\",\""), pwd, GF("\""));
        if (waitResponse(30000L, GFP(GSM_OK), GF(GSM_NL "FAIL" GSM_NL)) != 1) {
            return false;
        }
 
        return true;
    }
 
    bool networkDisconnect()
    {
        sendAT(GF("+CWQAP"));
        bool retVal = waitResponse(10000L) == 1;
        waitResponse(GF("WIFI DISCONNECT"));
        return retVal;
    }
 
    String getLocalIP()
    {
        sendAT(GF("+CIPSTA_CUR??"));
        int res1 = waitResponse(GF("ERROR"), GF("+CWJAP_CUR:"));
        if (res1 != 2) {
            return "";
        }
        String res2 = stream.readStringUntil('"');
        waitResponse();
        return res2;
    }
 
    IPAddress localIP()
    {
        return TinyGsmIpFromString(getLocalIP());
    }
 
protected:
 
    bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false)
    {
        if (ssl) {
            sendAT(GF("+CIPSSLSIZE=4096"));
            waitResponse();
        }
        sendAT(GF("+CIPSTART="), mux, ',', ssl ? GF("\"SSL") : GF("\"TCP"), GF("\",\""), host, GF("\","),
               port, GF(","), TINY_GSM_TCP_KEEP_ALIVE);
        // TODO: Check mux
        int rsp = waitResponse(75000L,
                               GFP(GSM_OK),
                               GFP(GSM_ERROR),
                               GF("ALREADY CONNECT"));
        // if (rsp == 3) waitResponse();  // May return "ERROR" after the "ALREADY CONNECT"
        return (1 == rsp);
    }
 
    int modemSend(const void* buff, size_t len, uint8_t mux)
    {
        sendAT(GF("+CIPSEND="), mux, ',', len);
        if (waitResponse(GF(">")) != 1) {
            return 0;
        }
        stream.write((uint8_t*)buff, len);
        stream.flush();
        if (waitResponse(10000L, GF(GSM_NL "SEND OK" GSM_NL)) != 1) {
            return 0;
        }
        return len;
    }
 
    bool modemGetConnected(uint8_t mux)
    {
        // TODO: re-check this
        sendAT(GF("+CIPSTATUS="), mux);
        int res1 = waitResponse(3000, GF("STATUS:"));
        int res2;
        if (res1 == 1) {
            res2 = waitResponse(GFP(GSM_ERROR), GF("2"), GF("3"), GF("4"), GF("5"));
        }
        // <stat> status of ESP8266 station interface
        // 2 : ESP8266 station connected to an AP and has obtained IP
        // 3 : ESP8266 station created a TCP or UDP transmission
        // 4 : the TCP or UDP transmission of ESP8266 station disconnected (but AP is connected)
        // 5 : ESP8266 station did NOT connect to an AP
        waitResponse();  // Returns an OK after the status
        if (res2 == 2 || res2 == 3 || res2 == 4) {
            return true;
        } else {
            return false;
        }
    }
 
public:
 
    /* Utilities */
 
    template<typename T>
    void streamWrite(T last)
    {
        stream.print(last);
    }
 
    template<typename T, typename... Args>
    void streamWrite(T head, Args... tail)
    {
        stream.print(head);
        streamWrite(tail...);
    }
 
    bool streamSkipUntil(char c)   //TODO: timeout
    {
        while (true) {
            while (!stream.available()) {
                TINY_GSM_YIELD();
            }
            if (stream.read() == c) {
                return true;
            }
        }
        return false;
    }
 
    template<typename... Args>
    void sendAT(Args... cmd)
    {
        streamWrite("AT", cmd..., GSM_NL);
        stream.flush();
        TINY_GSM_YIELD();
        //DBG("### AT:", cmd...);
    }
 
    // TODO: Optimize this!
    uint8_t waitResponse(uint32_t timeout, String& data,
                         GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                         GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
    {
        /*String r1s(r1); r1s.trim();
        String r2s(r2); r2s.trim();
        String r3s(r3); r3s.trim();
        String r4s(r4); r4s.trim();
        String r5s(r5); r5s.trim();
        DBG("### ..:", r1s, ",", r2s, ",", r3s, ",", r4s, ",", r5s);*/
        data.reserve(64);
        int index = 0;
        unsigned long startMillis = millis();
        do {
            TINY_GSM_YIELD();
            while (stream.available() > 0) {
                int a = stream.read();
                if (a <= 0) {
                    continue;    // Skip 0x00 bytes, just in case
                }
                data += (char)a;
                if (r1 && data.endsWith(r1)) {
                    index = 1;
                    goto finish;
                } else if (r2 && data.endsWith(r2)) {
                    index = 2;
                    goto finish;
                } else if (r3 && data.endsWith(r3)) {
                    index = 3;
                    goto finish;
                } else if (r4 && data.endsWith(r4)) {
                    index = 4;
                    goto finish;
                } else if (r5 && data.endsWith(r5)) {
                    index = 5;
                    goto finish;
                } else if (data.endsWith(GF(GSM_NL "+IPD,"))) {
                    int mux = stream.readStringUntil(',').toInt();
                    int len = stream.readStringUntil(':').toInt();
                    int len_orig = len;
                    if (len > sockets[mux]->rx.free()) {
                        DBG("### Buffer overflow: ", len, "->", sockets[mux]->rx.free());
                    } else {
                        DBG("### Got: ", len, "->", sockets[mux]->rx.free());
                    }
                    while (len--) {
                        while (!stream.available()) {
                            TINY_GSM_YIELD();
                        }
                        sockets[mux]->rx.put(stream.read());
                    }
                    if (len_orig > sockets[mux]->available()) { // TODO
                        DBG("### Fewer characters received than expected: ", sockets[mux]->available(), " vs ", len_orig);
                    }
                    data = "";
                } else if (data.endsWith(GF("CLOSED"))) {
                    int muxStart = max(0,data.lastIndexOf(GSM_NL, data.length()-8));
                    int coma = data.indexOf(',', muxStart);
                    int mux = data.substring(muxStart, coma).toInt();
                    if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
                        sockets[mux]->sock_connected = false;
                    }
                    data = "";
                    DBG("### Closed: ", mux);
                }
            }
        } while (millis() - startMillis < timeout);
finish:
        if (!index) {
            data.trim();
            if (data.length()) {
                DBG("### Unhandled:", data);
            }
            data = "";
        }
        return index;
    }
 
    uint8_t waitResponse(uint32_t timeout,
                         GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                         GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
    {
        String data;
        return waitResponse(timeout, data, r1, r2, r3, r4, r5);
    }
 
    uint8_t waitResponse(GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
                         GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
    {
        return waitResponse(1000, r1, r2, r3, r4, r5);
    }
 
public:
    Stream&       stream;
 
protected:
    GsmClient*    sockets[TINY_GSM_MUX_COUNT];
};
 
#endif