A6 A7 gateway (GSM GPRS) (#195)

* init 2G gateway with SMS sending and receiving

* A6lib add

* add 2Ggateway call from setup and loop

* add schematic and image

lib/A6lib/A6lib.h

@@ -0,0 +1,111 @@
+#ifndef A6lib_h
+#define A6lib_h
+
+#include <Arduino.h>
+#include "SoftwareSerial.h"
+
+#ifdef DEBUG
+#define log(msg) Serial.print(msg)
+#define logln(msg) Serial.println(msg)
+#else
+#define log(msg)
+#define logln(msg)
+#endif
+
+#define countof(a) (sizeof(a) / sizeof(a[0]))
+
+#define A6_OK 0
+#define A6_NOTOK 1
+#define A6_TIMEOUT 2
+#define A6_FAILURE 3
+
+#define A6_CMD_TIMEOUT 5000
+
+
+enum call_direction {
+    DIR_OUTGOING = 0,
+    DIR_INCOMING = 1
+};
+
+enum call_state {
+    CALL_ACTIVE = 0,
+    CALL_HELD = 1,
+    CALL_DIALING = 2,
+    CALL_ALERTING = 3,
+    CALL_INCOMING = 4,
+    CALL_WAITING = 5,
+    CALL_RELEASE = 7
+};
+
+enum call_mode {
+    MODE_VOICE = 0,
+    MODE_DATA = 1,
+    MODE_FAX = 2,
+    MODE_VOICE_THEN_DATA_VMODE = 3,
+    MODE_VOICE_AND_DATA_VMODE = 4,
+    MODE_VOICE_AND_FAX_VMODE = 5,
+    MODE_VOICE_THEN_DATA_DMODE = 6,
+    MODE_VOICE_AND_DATA_DMODE = 7,
+    MODE_VOICE_AND_FAX_FMODE = 8,
+    MODE_UNKNOWN = 9
+};
+
+struct SMSmessage {
+    String number;
+    String date;
+    String message;
+};
+
+struct callInfo {
+    int index;
+    call_direction direction;
+    call_state state;
+    call_mode mode;
+    int multiparty;
+    String number;
+    int type;
+};
+
+
+class A6lib {
+public:
+    A6lib(int transmitPin, int receivePin);
+    ~A6lib();
+
+    byte begin(long baudRate);
+    byte blockUntilReady(long baudRate);
+
+    void powerCycle(int pin);
+    void powerOn(int pin);
+    void powerOff(int pin);
+
+    void dial(String number);
+    void redial();
+    void answer();
+    void hangUp();
+    callInfo checkCallStatus();
+    int getSignalStrength();
+
+    byte sendSMS(String number, String text);
+    int getUnreadSMSLocs(int* buf, int maxItems);
+    int getSMSLocs(int* buf, int maxItems);
+    int getSMSLocsOfType(int* buf, int maxItems, String type);
+    SMSmessage readSMS(int index);
+    byte deleteSMS(int index);
+    byte deleteSMS(int index, int flag);
+    byte setSMScharset(String charset);
+
+    void setVol(byte level);
+    void enableSpeaker(byte enable);
+
+    String getRealTimeClock();
+
+    SoftwareSerial *A6conn;
+private:
+    String read();
+    byte A6command(const char *command, const char *resp1, const char *resp2, int timeout, int repetitions, String *response);
+    byte A6waitFor(const char *resp1, const char *resp2, int timeout, String *response);
+    long detectRate();
+    char setRate(long baudRate);
+};
+#endif