fix support for the esp8266

src/SSLClient.cpp

@@ -35,6 +35,8 @@ static constexpr auto VECTKEY_MASK = (0x0000ffffUL);
 #ifdef __arm__
 // should use uinstd.h to define sbrk but Due causes a conflict
 extern "C" char* sbrk(int incr);
+#elif defined(ESP8266) // esp8266
+#define SYSTEM_STACK_END_ADDRESS 0x3FFFC000
 #else  // __ARM__
 extern char *__brkval;
 #endif  // __arm__
@@ -44,6 +46,9 @@ static int freeMemory() {
   char top;
 #ifdef __arm__
   return &top - reinterpret_cast<char*>(sbrk(0));
+#elif defined(ESP8266) // ESP8266
+  register volatile uint32_t stackAddress asm("a1");
+  return stackAddress-SYSTEM_STACK_END_ADDRESS;
 #elif defined(CORE_TEENSY) || (ARDUINO > 103 && ARDUINO != 151)
   return &top - __brkval;
 #else  // __arm__

src/SSLClient.h

@@ -358,6 +358,18 @@ public:
     /** @brief Returns a reference to the client object stored in this class. Take care not to break it. */
     Client& getClient() { return m_client; }
 
+    /** 
+     * @brief Set the timeout when waiting for an SSL response.
+     * @param t The timeout value, in milliseconds (defaults to 30 seconds if not set). Do not set to zero.
+     */
+	void setTimeout(unsigned int t) { m_timeout = t; }
+
+    /** 
+     * @brief Get the timeout when waiting for an SSL response.
+     * @returns The timeout value in milliseconds.
+     */
+    unsigned int getTimeout() const { return m_timeout; }
+
 private:
     /** @brief Returns an instance of m_client that is polymorphic and can be used by SSLClientImpl */
     Client& get_arduino_client() { return m_client; }
@@ -419,6 +431,8 @@ private:
     const DebugLevel m_debug;
     // store if we are connected in bearssl or not
     bool m_is_connected;
+    // store the timeout for SSL internals
+    unsigned int m_timeout;
     // store the context values required for SSL
     br_ssl_client_context m_sslctx;
     br_x509_minimal_context m_x509ctx;