From 71299d3224b6f8422f540c91cc0d3f0e89408e90 Mon Sep 17 00:00:00 2001
From: Jim Mussared <jim.mussared@gmail.com>
Date: Thu, 7 Nov 2019 22:00:01 +1100
Subject: [PATCH] esp32/boards/sdkconfig.base: Resize SSL output buffer from 16
 to 4kiB.

The IDF heap is more fragmented with IDF 4 and mbedtls cannot allocate
enough RAM with 16+16kiB for both in and out buffers, so reduce output
buffer size.

Fixes issue #5303.
---
 ports/esp32/boards/sdkconfig.base | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ports/esp32/boards/sdkconfig.base b/ports/esp32/boards/sdkconfig.base
index 9348f40632..2c77c20907 100644
--- a/ports/esp32/boards/sdkconfig.base
+++ b/ports/esp32/boards/sdkconfig.base
@@ -28,6 +28,10 @@ CONFIG_LWIP_PPP_SUPPORT=y
 CONFIG_LWIP_PPP_PAP_SUPPORT=y
 CONFIG_LWIP_PPP_CHAP_SUPPORT=y
 
+# SSL
+# Use 4kiB output buffer instead of default 16kiB (because IDF heap is fragmented in 4.0)
+CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN=y
+
 # v3.3-only (renamed in 4.0)
 CONFIG_LOG_BOOTLOADER_LEVEL_WARN=y
 CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU0=n