mbedtls: Replace COAP-specific max len setting with generic

Instead of CONFIG_COAP_MBEDTLS_SSL_MAX_CONTENT_LEN, use recently
introduced CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN.

Signed-off-by: Paul Sokolovsky <[email protected]>

Author: pfalcon

ext/lib/crypto/mbedtls/configs/config-coap.h

@@ -91,15 +91,11 @@
 #define MBEDTLS_SSL_CIPHERSUITES  MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8
 
 /*
- * Save RAM at the expense of interoperability: do this only if you control
- * both ends of the connection!  (See comments in "mbedtls/ssl.h".)
+ * Allow to save RAM at the expense of interoperability: do this only if you
+ * control both ends of the connection!  (See comments in "mbedtls/ssl.h".)
  * The optimal size here depends on the typical size of records.
  */
-#ifndef CONFIG_COAP_MBEDTLS_SSL_MAX_CONTENT_LEN
-#define MBEDTLS_SSL_MAX_CONTENT_LEN	1500
-#else
-#define MBEDTLS_SSL_MAX_CONTENT_LEN	CONFIG_COAP_MBEDTLS_SSL_MAX_CONTENT_LEN
-#endif
+#define MBEDTLS_SSL_MAX_CONTENT_LEN  CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN
 
 #include "mbedtls/check_config.h"
 

samples/net/coaps_client/prj.conf

@@ -21,7 +21,7 @@ CONFIG_MBEDTLS_BUILTIN=y
 CONFIG_MBEDTLS_CFG_FILE="config-coap.h"
 
 CONFIG_COAP=y
-CONFIG_COAP_MBEDTLS_SSL_MAX_CONTENT_LEN=256
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=256
 
 CONFIG_NET_APP_SETTINGS=y
 CONFIG_NET_APP_MY_IPV6_ADDR="2001:db8::3"

samples/net/coaps_server/prj.conf

@@ -17,7 +17,7 @@ CONFIG_NET_IF_MCAST_IPV6_ADDR_COUNT=5
 CONFIG_NET_MAX_CONTEXTS=10
 
 CONFIG_COAP=y
-CONFIG_COAP_MBEDTLS_SSL_MAX_CONTENT_LEN=256
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=256
 
 CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_BUILTIN=y

subsys/net/lib/coap/Kconfig

@@ -62,16 +62,6 @@ config COAP_EXTENDED_OPTIONS_LEN_VALUE
 	  COAP_EXTENDED_OPTIONS_LEN is enabled. Define the value according to
 	  user requirement.
 
-config COAP_MBEDTLS_SSL_MAX_CONTENT_LEN
-	int "CoAP MBEDTLS maximum content length value"
-	default 1500
-	range 256 16384
-	depends on MBEDTLS
-	help
-	  This option sets the value of the MBEDTLS_SSL_MAX_CONTENT_LEN option
-	  in ext/lib/crypto/mbedtls/configs/config-coap.h  For client/server
-	  communication to work these values need to be the same on both sides.
-
 config NET_DEBUG_COAP
 	bool "Debug COAP"
 	default n