Add non-blocking support to ESP8266Interface

requires changes in the following
- BufferedSerial
- ESP8266
- ESP8266Interface

net/ESP8266Interface/ESP8266/ATParser/BufferedSerial/BufferedSerial.cpp

@@ -122,6 +122,10 @@ void BufferedSerial::rxIrq(void)
     // read from the peripheral and make sure something is available
     if(serial_readable(&_serial)) {
         _rxbuf = serial_getc(&_serial); // if so load them into a buffer
+        // trigger callback if necessary
+        if (_cbs[RxIrq]) {
+            _cbs[RxIrq]();
+        }
     }
 
     return;
@@ -136,6 +140,10 @@ void BufferedSerial::txIrq(void)
         } else {
             // disable the TX interrupt when there is nothing left to send
             RawSerial::attach(NULL, RawSerial::TxIrq);
+            // trigger callback if necessary
+            if (_cbs[TxIrq]) {
+                _cbs[TxIrq]();
+            }
             break;
         }
     }
@@ -155,4 +163,8 @@ void BufferedSerial::prime(void)
     return;
 }
 
+void BufferedSerial::attach(Callback<void()> func, IrqType type)
+{
+    _cbs[type] = func;
+}
 

net/ESP8266Interface/ESP8266/ATParser/BufferedSerial/BufferedSerial.h

@@ -80,6 +80,8 @@ private:
     void txIrq(void);
     void prime(void);
 
+    Callback<void()> _cbs[2];
+    
 public:
     /** Create a BufferedSerial port, connected to the specified transmit and receive pins
      *  @param tx Transmit pin
@@ -135,6 +137,22 @@ public:
      *  @return The number of bytes written to the Serial Port Buffer
      */
     virtual ssize_t write(const void *s, std::size_t length);
+
+    /** Attach a function to call whenever a serial interrupt is generated
+     *  @param func A pointer to a void function, or 0 to set as none
+     *  @param type Which serial interrupt to attach the member function to (Serial::RxIrq for receive, TxIrq for transmit buffer empty)
+     */
+    virtual void attach(Callback<void()> func, IrqType type=RxIrq);
+
+    /** Attach a member function to call whenever a serial interrupt is generated
+     *  @param obj pointer to the object to call the member function on
+     *  @param method pointer to the member function to call
+     *  @param type Which serial interrupt to attach the member function to (Serial::RxIrq for receive, TxIrq for transmit buffer empty)
+     */
+    template <typename T, typename M>
+    void attach(T *obj, M method, IrqType type=RxIrq) {
+        attach(Callback<void()>(obj, method), type);
+    }
 };
 
 #endif

net/ESP8266Interface/ESP8266/ESP8266.cpp

@@ -167,3 +167,7 @@ bool ESP8266::writeable()
     return _serial.writeable();
 }
 
+void ESP8266::attach(Callback<void()> func)
+{
+    _serial.attach(func);
+}

net/ESP8266Interface/ESP8266/ESP8266.h

@@ -144,6 +144,24 @@ public:
     */
     bool writeable();
 
+    /**
+    * Attach a function to call whenever network state has changed
+    *
+    * @param func A pointer to a void function, or 0 to set as none
+    */
+    void attach(Callback<void()> func);
+
+    /**
+    * Attach a function to call whenever network state has changed
+    *
+    * @param obj pointer to the object to call the member function on
+    * @param method pointer to the member function to call
+    */
+    template <typename T, typename M>
+    void attach(T *obj, M method) {
+        attach(Callback<void()>(obj, method));
+    }
+
 private:
     BufferedSerial _serial;
     ATParser _parser;

net/ESP8266Interface/ESP8266Interface.cpp

@@ -29,6 +29,9 @@ ESP8266Interface::ESP8266Interface(PinName tx, PinName rx, bool debug)
     : _esp(tx, rx, debug)
 {
     memset(_ids, 0, sizeof(_ids));
+    memset(_cbs, 0, sizeof(_cbs));
+
+    _esp.attach(this, &ESP8266Interface::event);
 }
 
 int ESP8266Interface::connect(
@@ -203,4 +206,15 @@ int ESP8266Interface::socket_recvfrom(void *handle, SocketAddress *addr, void *d
 
 void ESP8266Interface::socket_attach(void *handle, void (*callback)(void *), void *data)
 {
+    struct esp8266_socket *socket = (struct esp8266_socket *)handle;    
+    _cbs[socket->id].callback = callback;
+    _cbs[socket->id].data = data;
+}
+
+void ESP8266Interface::event() {
+    for (int i = 0; i < ESP8266_SOCKET_COUNT; i++) {
+        if (_cbs[i].callback) {
+            _cbs[i].callback(_cbs[i].data);
+        }
+    }
 }

net/ESP8266Interface/ESP8266Interface.h

@@ -167,6 +167,12 @@ protected:
 private:
     ESP8266 _esp;
     bool _ids[ESP8266_SOCKET_COUNT];
+
+    void event();
+    struct {
+        void (*callback)(void *);
+        void *data;
+    } _cbs[ESP8266_SOCKET_COUNT];
 };
 
 #endif