Add more TLS buffer space (#682)

CMakeLists.txt

@@ -114,13 +114,13 @@ endif()
 
 # Set the output buffer size to 3700, reduced from 16k.  This is small enough
 # that the allocation from MbedTLS is < 4k, 4033bytes to be precise.  We set
-# the input buffer length to 6k because some sites have very large certificates
+# the input buffer length to 8k because some sites have very large certificates
 # (eg Telegram, over 5100 bytes) and this is not something we can control.
 # There are some protocol extensions for telling the other side about our buffer
 # sizes, but they just cause the other side to fragment packets more agressively.
 # At this end we still have to reassemble the packets in and unfragmented form
 # that fits in the buffer size below.
-set(MBEDTLS_C_FLAGS "-DMBEDTLS_SSL_IN_CONTENT_LEN=6400 -DMBEDTLS_SSL_OUT_CONTENT_LEN=3700 -DMBEDTLS_PLATFORM_MEMORY=1")
+set(MBEDTLS_C_FLAGS "-DMBEDTLS_SSL_IN_CONTENT_LEN=8100 -DMBEDTLS_SSL_OUT_CONTENT_LEN=3700 -DMBEDTLS_PLATFORM_MEMORY=1")
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${TOIT_GENERIC_FLAGS} ${TOIT_LWIP_C_FLAGS} ${MBEDTLS_C_FLAGS}")
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DDEBUG")