[ESP8266] Added Doxygen comments

src/modules/ESP8266.h

@@ -5,14 +5,45 @@
 
 #include "../protocols/TransportLayer.h"
 
+/*!
+  \class ESP8266
+
+  \brief Control class for %ESP8266 module. Implements TransportLayer methods.
+*/
 class ESP8266: public TransportLayer {
   public:
-    // constructor
+    /*!
+      \brief Default constructor.
+
+      \param mod Instance of Module that will be used to communicate with the radio.
+    */
     ESP8266(Module* module);
 
     // basic methods
+
+    /*!
+      \brief Initialization method.
+
+      \param speed Baud rate to use for UART interface.
+
+      \returns \ref status_codes
+    */
     int16_t begin(long speed);
+
+    /*!
+      \brief Resets module using AT command.
+
+      \returns \ref status_codes
+    */
     int16_t reset();
+
+    /*!
+      \brief Joins access point.
+
+      \param ssid Access point SSID.
+
+      \param password Access point password.
+    */
     int16_t join(const char* ssid, const char* password);
 
     // transport layer methods (implementations of purely virtual methods in TransportMethod class)