- TLS client: fixed problem with high CPU load

config/stack_config.h

@@ -39,6 +39,10 @@
  */
 #define CONFIG_MMS_SINGLE_THREADED 0
 
+#if (WITH_MBEDTLS == 1)
+#define CONFIG_MMS_SUPPORT_TLS 1
+#endif
+
 /*
  * Optimize stack for threadless operation - don't use semaphores
  *

src/tls/mbedtls/tls_mbedtls.c

@@ -343,8 +343,10 @@ readFunction(void* ctx, unsigned char* buf, size_t len)
 {
     int ret = Socket_read((Socket) ctx, buf, len);
 
-    if ((ret == 0) && (len > 0))
+    if ((ret == 0) && (len > 0)) {
+        Thread_sleep(1);
         return MBEDTLS_ERR_SSL_WANT_READ;
+    }
 
     return ret;
 }