Add errorCode() API

Author: sandeepmistry

.development

@@ -17,6 +17,7 @@ getTime	KEYWORD2
 onGetTime	KEYWORD2
 
 setEccSlot	KEYWORD2
+errorCode	KEYWORD2
 
 ########################################
 # Constants (LITERAL1)

keywords.txt

@@ -238,6 +238,11 @@ void BearSSLClient::setEccSlot(int ecc508KeySlot, const char cert[])
   }
 }
 
+int BearSSLClient::errorCode()
+{
+  return br_ssl_engine_last_error(&_sc.eng);
+}
+
 int BearSSLClient::connectSSL(const char* host)
 {
   // initialize client context with all algorithms and hardcoded trust anchors

src/BearSSLClient.cpp

@@ -59,6 +59,8 @@ class BearSSLClient : public Client {
   void setEccSlot(int ecc508KeySlot, const byte cert[], int certLength);
   void setEccSlot(int ecc508KeySlot, const char cert[]);
 
+  int errorCode();
+
 private:
   int connectSSL(const char* host);
   static int clientRead(void *ctx, unsigned char *buf, size_t len);