diff --git a/samples/net/sockets/echo_client/overlay-ot.conf b/samples/net/sockets/echo_client/overlay-ot.conf
index 163860444c1..713d87f196c 100644
--- a/samples/net/sockets/echo_client/overlay-ot.conf
+++ b/samples/net/sockets/echo_client/overlay-ot.conf
@@ -39,3 +39,11 @@ CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_MPU_ALLOW_FLASH_WRITE=y
 
 CONFIG_REBOOT=y
+
+# mbedTLS tweaks
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=768
+
+# A sample configuration to enable Thread Joiner, uncomment if needed
+#CONFIG_OPENTHREAD_JOINER=y
+#CONFIG_OPENTHREAD_JOINER_AUTOSTART=y
+#CONFIG_MBEDTLS_HEAP_SIZE=8192
diff --git a/samples/net/sockets/echo_server/overlay-ot.conf b/samples/net/sockets/echo_server/overlay-ot.conf
index eb49cf9a968..a7da39076f0 100644
--- a/samples/net/sockets/echo_server/overlay-ot.conf
+++ b/samples/net/sockets/echo_server/overlay-ot.conf
@@ -39,3 +39,10 @@ CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_MPU_ALLOW_FLASH_WRITE=y
 
 CONFIG_REBOOT=y
+
+# mbedTLS tweaks
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=768
+
+# A sample configuration to enable Thread Commissioner, uncomment if needed
+#CONFIG_OPENTHREAD_COMMISSIONER=y
+#CONFIG_MBEDTLS_HEAP_SIZE=8192